Well, Ray, I am a firm believer in "you get what you pay for" and I believe you did. This is one sweet machine! I was envious of it when you showed the assembly and am now envious again!
Yeah, this tool looks pretty stout. The various brackets and fitments seem to be machined out of Aluminum billet and bar. Always nice to see manufacture like that as opposed various parts cast out of "Chineesium", or plastic. Kudos to Northridge for building like that. This should last for kids and grandkids.
@@RaysGarage olá meu amigo, eu não sei o inglês mas gostaria de saber qual o valor dessa máquina, e se tem como importar para o Brasil?. Se possível, ficarei agradecido. Obrigado!.
@@paulocesaraugusto.6423 Hello Paulo, I paid $3.000 US Dollars for the Pro Package and am sure you could make arrangements with North Ridge Tool to ship one to you in Brazil. It is one very good belt grinder, I use it every day and its a true work horse! Cheers, Ray
I appreciate your thorough reviews, I own a Northridge Belt Grinder, and your videos made it easy for me to decide to buy the ratchet tensioning mechanism, which they weren't offering when I bought my unit, so I upgraded and it was an easy decision after seeing your vids.--Thanks
Thanks Don, Your going to really like the ratcheting feature, makes belt changes real easy and you can get a better belt tension feel with this set up!
Thank you much Ray. A great review! Starting at the 10:13 mark of the video. When the machine is in the horizontal position. The tool rest is then away from the center of the plenum. I'm scratching my head, looking at the adjustments for the tool rest. Trying to figure out just how that is possibly going to get moved over there that far. It would be great, if in an upcoming video. You could show is just how that works. Thanks again Ray!
Hi Ray, When you un-boxed this machine i could see it was a really nice piece of kit. This video reinforces its a quality product and clearly no expense has been spared to deliver a machine which will really last in the shop. Thanks for sharing. Joe.
That's for sure, been using this for about a year now and it kicks ass, looks pretty too! Maybe one of these days I'll try my hand at making a knife instead of using the grinder for fab work and sharping pencils... Thanks for tuning in!
Hi Ray, I spent the day rewiring and rebuilding our very old and well used Delta/Rockwell 1 X 42 belt sander, Mod# 31-350. You are a tuff act to follow, but you win!! Now if I could just talk the boss at work to get one of these baby's.... Nice toy Ray!
Many Thanks Patrick, Once you use a grinder like this you will wonder why the heck you did not get one years ago, this grinder makes very short work of many grinding needs!
Good review. So in order to use the tool rest, when the grinder is in the horizontal position, u need to pull out the tool rest bar and reinsert it so that it will line up with the belt in the horizontal position?
Ray just to let you know. I have been to the Northridge Tool website and read what they're doing. As an electrical and electronic engineer of nearly 50 years I have a great understanding of VFD's and 3 phase induction motors. What they're doing is using a 4 pole 1800 RPM at 60 hz motor which has twice the rated torque of a 2 pole 3600 RPM at 60 hz motor. Then they set up the drive to go from 0 to 100% speed which in this case is actually 0 to 200% of the motors rated speed. Therefore the dial on the only represents a percentage of output frequency which is 0 to 120 hz this makes an 1800 RPM base speed motor run at 3600 RPM no load. But there is something called slip which I won't get into hear. But as you pass 60 hz the torque begins to drop off because as you reach 120 hz the motor voltage requirement now doubles instead of 240 volts to maintain full torque the drive would need to provide 480 volts to the motor which would result in the motor making 4 Horsepower. But the drive cannot provide more voltage than it's receiving. So the torque drops off to maintain 2 Horsepower. As the motor is essentially running on half voltage at full speed. Just for your reference 15 RPM / hz. This is such a beautiful machine I wish they had used a better drive, one with a display that has a scaling function what they call in the industry process speed then by entering a constant the display would read out the belt speed in ft/minute.
Hello Robert, Thank you so much for taking the time in sharing this excellent information, very educational! I do notice when its turned all the up I can get it to bog down a little bit when using very coarse belts and you explained why. Thanks again and thanks for tuning in! Best Regards, Ray
Ray, 60 hertz is the frequency of power in the USA Your drive is at 60hertz when dial is at 100%(motor is at full speed) Dial at 50 (half of nameplate RPM) Great video! Thanks
Ray, instead of RPM's, I believe belt grinders are rated at SFPM(surface feet per minute) which it could quite possibly be 6000 SFPM on the 100 setting of the VFD. Of course I could be wrong. It happens often......LOL
I think you are correct, it is surface feet per min now that you mention it. I can tell you it is plenty fast and plenty powerful! Thanks for the info and sharing it!
I watched your unpacking and assemble and could not believe the quality in that unit. I ordered one end of Jan or First part of Feb. (been a while so can't remember exactly) they told me it would be 4-5 months. I was shocked but it isn't the first thing I have ordered that h had a long lead time. I am not going to take lesser quality just to get something sooner. So I wait. I was told today after the Atlanta Knife show they will be assembling the grinders. I'm like a kid in a candy store and no one to give my money to, to get the candy. But I have looked at all the machines out there and theirs is the best and worth waiting. My 2 x 42 shitty grinder is hardly holding on. (pushing the belt to get it to go) But to wait another month is fine with me. Spend the money if your a professional. you want people to buy your knives then spend good money to use quality equipment like this.
The diagonal splice joint on the sanding belt - isn't the high side ALWAYS on the left, even when you turn the belt around? Is it RPM or is it SFM (surface feet per minute)?
Yes, it is surface feet per min, just learned this ten minutes ago and have no idea how to calculate that. All the 2" x 72" belts I have bought and used on this grinder have been this way so if I am wrong please explain. Thanks!
The way to tell is to look at the over lap at the joint, the belt should go in the direction where the overlap is not going to catch, think in terms of scotch tape, one direction will unpeel it and the other will force it down. Long winded explanation by dead easy to demonstrate. Just for an interesting addition your general knowledge, road tyres for motorcycles that have arrows for direction go one way on the front and the other for the back. This is so that there is no risk of the tread unrolling under braking on the front, or under drive on the back. As for demonstrating products, promise me you wont be the model for bikinis when the pool is finished.>)
SFM is that same as you calc for mill or lathe cutting. RPM x Diameter (in feet) of the rotating piece (wheel, cutter, work). About belt direction, I am not sure it matters these days with modern belts. Sanding belts used to be lapped instead of butted and then reinforced with tape on the back side. All of my experience with sanding belts is from 40+ years in the cabinet business.
Hey Ray, awesome review. I am up in the air on Pheer, TW90 and this unit. I like what I've seen you show. May I ask what you paid for the ratchet lock? Also, their website doesn't show the small wheel attachment as included in the pro package! Thanks for taking the time to give a thorough review. Jon SignyRoseSteel.
Hi Jon, The small wheel arm is included in the Pro Package but not the wheels. I'm pretty sure if you ask for the ratchet instead of the gas shock it is included at no extra charge but I would contact George to verify. I was in the same place as you one year ago and was looking at the same three. I am very happy with the NRT tool grinder and would buy it again, its a metal eating beast and smooth as glass when running. I use it almost every day for multiple tasks! Good luck with your choice! Best Regards, Ray
Check the motor plate, It will give you the rpm rating for the motor at 60 HZ. It's either 1725 or 3600. Use that number to calculate the rpm at other frequencies. Then I'm sure there's a formula for calculating belt feet per minute in Machinery handbook. Looks like a great tool thanks for sharing it with us.
I ordered mine like yours with the round knobs and the click ratchet tensioner. They told me I have to wait, it is still not ready. I wonder if my holdup is the special options.
They shipped my grinder. It gets here tomorrow. It has been a long 11 month wait. I called them and talked to George live. He tells me he has many orders to fill yet. It was nice that he remembered that I am the flashlight guy. Ray, my thanks go to you as well for chatting with me in email a few weeks back. I will take some video of it when it comes. Cheers
I did get get my grinder. Have not fired it up yet. It is identical to the one ray has except the tooling arms do not have the channel side cuts. Rather a new integrated push block buffers between the arm and the bolt.
@@barkbarkatthemoon Hows your grinder running?? Im in the same boat, just waiting for this next batch :) Also, and maybe Ray can comment....how sturdy is this on the stand? Rays appears to be wobbling a bit, but that may just be the cart. (I hope I just didnt miss this comment in the review) Thanks!! -Patrick
Well you just saved me 500. I don’t currently need the stand but will be mounting into my maple butcher block workbench. I did not want two sets of holes. Thanks a bunch. How are the grinders holding up?
The Mod-2 is three years old and gets used almost daily, it's as good as the day it was new! The Mod-E is a really good grinder for a budget machine and it too is holding up great, neither ever had any issues to date!
Yes, I'm a dumb ass and was just called out on it, looks like I'm going to have correct myself in the next vid and also share the correct SFPM and RPM of the belt. Thanks for pointing this out!
Na dont' be too hard on yourself. After all you're just trying to help people out. I wonder if there is a way to tell though (when the arrows wear off). Is there an overlap at the joint such that maybe the leading edge is higher than the trailing edge? Gorgeous craftsman ship on the machine though - I envy it. Have you happen to have seen this video ruclips.net/video/mhO45mww61c/видео.html ?
Just watched the video, he sure did make a very nice grinder and really like the radius attachment he made, thanks for sharing! I'll have to look at the belts closer and do thing there is a over lap, makes sense as to why they are directional. Thanks Bobby!
18:50 I wonder if you could calculate maybe (by hand) how many shaft revs per belt rev ...... then scratch a bold white chalk line through the belt so it's easy to see ....... maybe you could then put the machine at a slow setting - count the chalk lines in 60s and multiply it by the revs per belt rev to get close to the actual motor RPMs
That just might work, my luck it will make me dizzy and even more confused... I do some research and report back at a later date with correct specs! Thanks again Bobby!
Nice review, they owe you more than a few belts I’d say. Like to see you do a combat style knife, finger grooves, and a hollow ground blade. Going to my local metal supplier for belts and wheels today for my build. Enjoy your new toy, I mean tool. 👍
it looks like ,it is well made and with those specs....it is ........just the vfd is enough..... you don't normally see this in any sanding applications....and like you said,the quality is imppecable....nice review,Ray.....good job.....see you next time......
Ray Caniglia - Awesome! Thanks so much Ray. I just watched all your videos on the Pro Package and I think I'm going to order one. I called George and it sounds like the lead time is about 3 or 4 months but I think it will be worth the wait. Thanks for the AWESOME videos. -Jim
Ray, take your Fluke DVM that has a frequency counter mode and connect to a couple of the 3 phase leads between the VFD and the motor. 60 Hz is either going to be 1735 RPM. ** That works out to 28.9 RPM/ Hz. Generally I would not run the motor less than about 20Hz -- (578 RPM) the cooling fan doesn't provide enough air at less rpm also the motor is not too efficient below that rpm. On the high side I run my mill up to about 150 Hz with no issues. 150Hz would be around 4337 RPM. The VFD's can generally be programmed for a minimum and maximum frequency, which translates to RPM. The knob is most likely just has an arbitrary marking that linearly controls the frequency between the internal minimum and maximum limits. ** This may or may not work depending on how much of the high frequency switching frequency voltage remains on the lower motor frequency sign wave. The meter can get confused as to which you want to measure.
Great info Craig, thanks buddy, now all I need is a Fluke and i'll be of running! I'll check the motor plate, that should be a good start! Thanks again my friend!
With your mad skills you can build one no problem! I would be happy to give you some specs if you choose that route. I can say you do need one or something like it, makes fab work fun again!
Curious. Why on earth would they machine down the diameter of the motor shaft instead of putting the proper size bore on the drive pulley? So they have one pulley to fit several motor sizes? Something does not seem right about that.
At 60 hz the motor is spinning at nameplate rpm. So at 100 Hz the motor is running at slightly less than double the nameplate rpm. I can assume it’s a 3450 rpm motor so at 100 hz it would be running at approximately 6000 rpm.
if your motor is 1725 rpm at 60Hz (should be on the motor plate) then at 100Hz you'll have 2875 rpm. If it is a 3450 rpm motor in that case at 100Hz will be spinning 5750 rpm. Now, the formula is RPM=120*frequency/#poles, usually motors are rated at 60Hz in the US and 50Hz in Europe, if you use the formula a 4 pole comes to 1800 rpm and a 2 pole is at 3600 rpm at 60Hz or 3000 and 1500 rpm at 50Hz - the difference is called slip and depends on load and motor characteristics, common ones are 1725 or 3450 for 4 or 2 pole respectively. So it's all in the number of poles, based on sound in the video I think it is a 4 pole motor (so at 100 Hz close to 2900 rpm). Hope this helps.
This is not anybody else's design or copy of one. NRT developed his own design from scratch and machines all his own parts in house. The NRT Grinder might look like others but I can tell you its a completely different animal in a league of its own! Top notch and top quality! Thanks for tuning in!
well, you speak for yourself, i though Jeremy sell a design which he made 3 years ago, and you bitch level it up and broadcast the whole world that NRT new product *C*O*P*Y* the design. black and white in your reply. that`s it! if those features ate shit, this NRT grinder do have the SAME features, which is telling us this machine is also A PIECE OF SHIT? yea, we can see a lot of silver shiny parts, and a vfd but did not see any grinding, i am not sure how high the quality it is?
luderick wong I am sorry you feel this way and I have nothing to do with who copied who’s grinder design. I wanted a good quality grinder so I did my homework for several months and chose this NRT Grinder. I highly recommend you try this grinder before bashing it. I can not speak for the other grinder you mention since I am not familiar with it and really don’t remember it as one I was looking at before I bought this one. I would be happy to watch a video review on your RUclips Channel of the grinder you speak of, post a link so we can check it out. Best Regards, Ray
See what the hertz rating of your motor is. Typically in the US 60Hz is the incoming supply. If the VFD is set to 60 Hz then the motor will run at the rated rpm. 120 Hz would give double the rpm.
Ray that machine is way too pretty to actually use on serious work. Put it under glass and get a down and dirty work machine. I have an old Wilton 3”X72” machine that was used for years in the construction of Rose Parade floats. It’s still going strong however the platten has been repaired with brazing somewhere along the way. When I have nothing more pressing it’s on my list to-do. Randy
Hey Randy, I have been using the crap out this grinder for the past year but I did clean it up for this review. Sounds like you have yourself a bad ass grinder and a 3" belt must be nice! Thanks for sharing and for tuning in!
That makes sense, the belt does not look like its going 6000RPM more like 3000. I'll get the correct SFPM and RPM from NRT and share the info. Thanks man!
Where do you hide all the mess ?? Everything looks brand new in your videos. Your "shop". Looks like a Hollywood movie set, am I missing something or is it a shameless promotion of merchandise? Steve Callachor North Avoca. NSW. Australia 150 degrees east. 34 degrees south, 34 degrees Celsius
Hello Steve, Thank you for your kind words! I do and try to keep up in making my tools look good and yes, they all get used often. The camera does a good job in making things look good and if you look really close you just mind find a mess in the shop. Thanks for tuning in. Best Regards, Ray
Well, Ray, I am a firm believer in "you get what you pay for" and I believe you did. This is one sweet machine! I was envious of it when you showed the assembly and am now envious again!
I agree Reid but it did take many years before I started buying quality tools and this is a fine example of that!
Yeah, this tool looks pretty stout. The various brackets and fitments seem to be machined out of Aluminum billet and bar. Always nice to see manufacture like that as opposed various parts cast out of "Chineesium", or plastic. Kudos to Northridge for building like that. This should last for kids and grandkids.
@@RaysGarage olá meu amigo, eu não sei o inglês mas gostaria de saber qual o valor dessa máquina, e se tem como importar para o Brasil?.
Se possível, ficarei agradecido. Obrigado!.
@@paulocesaraugusto.6423 Hello Paulo, I paid $3.000 US Dollars for the Pro Package and am sure you could make arrangements with North Ridge Tool to ship one to you in Brazil. It is one very good belt grinder, I use it every day and its a true work horse! Cheers, Ray
@@RaysGarage O preço eu entendi ela custa $ 3.000 dólares, agora oque você disse eu não entendo. Kkkkk mas valeu pelo esclarecimento. Ok! Obrigado.
I appreciate your thorough reviews, I own a Northridge Belt Grinder, and your videos made it easy for me to decide to buy the ratchet tensioning mechanism, which they weren't offering when I bought my unit, so I upgraded and it was an easy decision after seeing your vids.--Thanks
Thanks Don, Your going to really like the ratcheting feature, makes belt changes real easy and you can get a better belt tension feel with this set up!
Thank you much Ray. A great review!
Starting at the 10:13 mark of the video. When the machine is in the horizontal position. The tool rest is then away from the center of the plenum. I'm scratching my head, looking at the adjustments for the tool rest. Trying to figure out just how that is possibly going to get moved over there that far. It would be great, if in an upcoming video. You could show is just how that works.
Thanks again Ray!
Hi Ray, When you un-boxed this machine i could see it was a really nice piece of kit. This video reinforces its a quality product and clearly no expense has been spared to deliver a machine which will really last in the shop. Thanks for sharing. Joe.
For sure Joe, the grinder is very well thought out and very well made, should last me a life time over! Thanks for commenting and for tuning in!
Great to see some good quality tools. Always great quality videos also. Great presentation. Thanks for sharing with us Ray.
That's for sure, nothing beats great quality and workmanship! Thanks for tuning in!
Thanks Ray for the review. I already have this grinder but I love to see other peoples reaction to how well its made! #1 Grinder!
That's for sure, been using this for about a year now and it kicks ass, looks pretty too! Maybe one of these days I'll try my hand at making a knife instead of using the grinder for fab work and sharping pencils... Thanks for tuning in!
Hi Ray, I spent the day rewiring and rebuilding our very old and well used Delta/Rockwell 1 X 42 belt sander, Mod# 31-350. You are a tuff act to follow, but you win!! Now if I could just talk the boss at work to get one of these baby's.... Nice toy Ray!
Many Thanks Patrick, Once you use a grinder like this you will wonder why the heck you did not get one years ago, this grinder makes very short work of many grinding needs!
Awesome video. Your review just put this Pro Package at the top of my list.
Good review. So in order to use the tool rest, when the grinder is in the horizontal position, u need to pull out the tool rest bar and reinsert it so that it will line up with the belt in the horizontal position?
Yes, that is what is really nice about the RAT Arm, no limit to any angle!
Ray just to let you know. I have been to the Northridge Tool website and read what they're doing. As an electrical and electronic engineer of nearly 50 years I have a great understanding of VFD's and 3 phase induction motors. What they're doing is using a 4 pole 1800 RPM at 60 hz motor which has twice the rated torque of a 2 pole 3600 RPM at 60 hz motor. Then they set up the drive to go from 0 to 100% speed which in this case is actually 0 to 200% of the motors rated speed. Therefore the dial on the only represents a percentage of output frequency which is 0 to 120 hz this makes an 1800 RPM base speed motor run at 3600 RPM no load. But there is something called slip which I won't get into hear. But as you pass 60 hz the torque begins to drop off because as you reach 120 hz the motor voltage requirement now doubles instead of 240 volts to maintain full torque the drive would need to provide 480 volts to the motor which would result in the motor making 4 Horsepower. But the drive cannot provide more voltage than it's receiving. So the torque drops off to maintain 2 Horsepower. As the motor is essentially running on half voltage at full speed. Just for your reference 15 RPM / hz. This is such a beautiful machine I wish they had used a better drive, one with a display that has a scaling function what they call in the industry process speed then by entering a constant the display would read out the belt speed in ft/minute.
Hello Robert, Thank you so much for taking the time in sharing this excellent information, very educational! I do notice when its turned all the up I can get it to bog down a little bit when using very coarse belts and you explained why. Thanks again and thanks for tuning in! Best Regards, Ray
All the parts are machined so Nice..I like how the rat arm can be adjusted in many different angles and height
Hey Jim, You got that right, all made with great care to precision and top quality and you sure can feel it when in use!
Ray,
60 hertz is the frequency of power in the USA
Your drive is at 60hertz when dial is at 100%(motor is at full speed)
Dial at 50 (half of nameplate RPM)
Great video!
Thanks
Thanks for the great information Thomas!
Love it! Looks great, looks solid. #envy
Thanks Man, It's one amazing grinder to say the least!
Ray, instead of RPM's, I believe belt grinders are rated at SFPM(surface feet per minute) which it could quite possibly be 6000 SFPM on the 100 setting of the VFD.
Of course I could be wrong. It happens often......LOL
I think you are correct, it is surface feet per min now that you mention it. I can tell you it is plenty fast and plenty powerful! Thanks for the info and sharing it!
@@RaysGarage That's over 1 miles per minute or about 60 MPH
I watched your unpacking and assemble and could not believe the quality in that unit. I ordered one end of Jan or First part of Feb. (been a while so can't remember exactly) they told me it would be 4-5 months. I was shocked but it isn't the first thing I have ordered that h had a long lead time. I am not going to take lesser quality just to get something sooner. So I wait. I was told today after the Atlanta Knife show they will be assembling the grinders. I'm like a kid in a candy store and no one to give my money to, to get the candy. But I have looked at all the machines out there and theirs is the best and worth waiting. My 2 x 42 shitty grinder is hardly holding on. (pushing the belt to get it to go) But to wait another month is fine with me. Spend the money if your a professional. you want people to buy your knives then spend good money to use quality equipment like this.
The diagonal splice joint on the sanding belt - isn't the high side ALWAYS on the left, even when you turn the belt around? Is it RPM or is it SFM (surface feet per minute)?
Yes, it is surface feet per min, just learned this ten minutes ago and have no idea how to calculate that. All the 2" x 72" belts I have bought and used on this grinder have been this way so if I am wrong please explain. Thanks!
The way to tell is to look at the over lap at the joint, the belt should go in the direction where the overlap is not going to catch, think in terms of scotch tape, one direction will unpeel it and the other will force it down. Long winded explanation by dead easy to demonstrate.
Just for an interesting addition your general knowledge, road tyres for motorcycles that have arrows for direction go one way on the front and the other for the back. This is so that there is no risk of the tread unrolling under braking on the front, or under drive on the back.
As for demonstrating products, promise me you wont be the model for bikinis when the pool is finished.>)
SFM is that same as you calc for mill or lathe cutting. RPM x Diameter (in feet) of the rotating piece (wheel, cutter, work). About belt direction, I am not sure it matters these days with modern belts. Sanding belts used to be lapped instead of butted and then reinforced with tape on the back side. All of my experience with sanding belts is from 40+ years in the cabinet business.
Marvin Carvin thanks for the info, I now understand and got it! Thanks again bud!
Chris Stephens Thanks Chris, I get it now, good explanation my friend! 👍
Hey Ray, awesome review. I am up in the air on Pheer, TW90 and this unit. I like what I've seen you show. May I ask what you paid for the ratchet lock? Also, their website doesn't show the small wheel attachment as included in the pro package!
Thanks for taking the time to give a thorough review.
Jon
SignyRoseSteel.
Hi Jon, The small wheel arm is included in the Pro Package but not the wheels. I'm pretty sure if you ask for the ratchet instead of the gas shock it is included at no extra charge but I would contact George to verify. I was in the same place as you one year ago and was looking at the same three. I am very happy with the NRT tool grinder and would buy it again, its a metal eating beast and smooth as glass when running. I use it almost every day for multiple tasks! Good luck with your choice! Best Regards, Ray
Check the motor plate, It will give you the rpm rating for the motor at 60 HZ. It's either 1725 or 3600. Use that number to calculate the rpm at other frequencies. Then I'm sure there's a formula for calculating belt feet per minute in Machinery handbook. Looks like a great tool thanks for sharing it with us.
That sounds too easy, I'll have to take a look at the motor plate and do some math. Thanks Chuck!
Awesome machine Ray.
Thanks Mike, this has been a great addition to the shop and use it all the time, not sure how I did without a grinder all these years!
I was just contacted about mine on 6/8/2018, they say this bunch is all assembled. I ordered November of 2017. I hope the wait is about over.
You are going to love your new grinder my friend!
I ordered mine like yours with the round knobs and the click ratchet tensioner. They told me I have to wait, it is still not ready. I wonder if my holdup is the special options.
They shipped my grinder. It gets here tomorrow. It has been a long 11 month wait. I called them and talked to George live. He tells me he has many orders to fill yet. It was nice that he remembered that I am the flashlight guy. Ray, my thanks go to you as well for chatting with me in email a few weeks back. I will take some video of it when it comes. Cheers
I did get get my grinder. Have not fired it up yet. It is identical to the one ray has except the tooling arms do not have the channel side cuts. Rather a new integrated push block buffers between the arm and the bolt.
@@barkbarkatthemoon Hows your grinder running?? Im in the same boat, just waiting for this next batch :)
Also, and maybe Ray can comment....how sturdy is this on the stand? Rays appears to be wobbling a bit, but that may just be the cart. (I hope I just didnt miss this comment in the review)
Thanks!!
-Patrick
Do you know if the tilting stand and the regular base have the same bolt pattern?
Hello Jordan, Yes they are the same.
Well you just saved me 500. I don’t currently need the stand but will be mounting into my maple butcher block workbench. I did not want two sets of holes. Thanks a bunch. How are the grinders holding up?
The Mod-2 is three years old and gets used almost daily, it's as good as the day it was new! The Mod-E is a really good grinder for a budget machine and it too is holding up great, neither ever had any issues to date!
That is a nice piece Ray!
ATB, Robin
Thanks Robin, I love this grinder and use it almost daily on all sorts of tasks. Thanks for tuning in my friend!
Best Regards, Ray
Excellent review, quality and precision. I'll keep an eye out for one on the secondary market, maybe end up with a Grizzly.
Save your pennies and get one similar to this and you will never regret it!
15:39 if you flip the belt wouldn't the high side then still be on the left?
Yes, I'm a dumb ass and was just called out on it, looks like I'm going to have correct myself in the next vid and also share the correct SFPM and RPM of the belt. Thanks for pointing this out!
Na dont' be too hard on yourself. After all you're just trying to help people out. I wonder if there is a way to tell though (when the arrows wear off). Is there an overlap at the joint such that maybe the leading edge is higher than the trailing edge? Gorgeous craftsman ship on the machine though - I envy it. Have you happen to have seen this video ruclips.net/video/mhO45mww61c/видео.html ?
Just watched the video, he sure did make a very nice grinder and really like the radius attachment he made, thanks for sharing! I'll have to look at the belts closer and do thing there is a over lap, makes sense as to why they are directional. Thanks Bobby!
that cart sure seems wobbly. Doesn't that make it difficult to grind on it?
Benoit Aigret Not really, It looks worse than it really is and like the mobility of it being mounted to this cart.
Great review, you covered pretty much all of it. Just a thought, probably should not reach over the top of a sander belt at full speed, just saying...
18:50 I wonder if you could calculate maybe (by hand) how many shaft revs per belt rev ...... then scratch a bold white chalk line through the belt so it's easy to see ....... maybe you could then put the machine at a slow setting - count the chalk lines in 60s and multiply it by the revs per belt rev to get close to the actual motor RPMs
That just might work, my luck it will make me dizzy and even more confused... I do some research and report back at a later date with correct specs! Thanks again Bobby!
Nice review, they owe you more than a few belts I’d say. Like to see you do a combat style knife, finger grooves, and a hollow ground blade. Going to my local metal supplier for belts and wheels today for my build. Enjoy your new toy, I mean tool. 👍
Thanks man! I will have to try my hand at making a knife one of these days instead of just using this grinder to grind and fab parts.
it looks like ,it is well made and with those specs....it is ........just the vfd is enough..... you don't normally see this in any sanding applications....and like you said,the quality is imppecable....nice review,Ray.....good job.....see you next time......
Thanks Ray, This grinder works amazing and makes short work of any grinding needs. Had I known of these in the past I would have gotten one years ago!
Do you remember where you purchased the small wheels set?
Jim Mitchell Hey Jim, Yes, Knife Grinder Parts.Com $120.00 for the Stainless Steel Polished and Ground. They work great!
Ray Caniglia - Awesome! Thanks so much Ray. I just watched all your videos on the Pro Package and I think I'm going to order one. I called George and it sounds like the lead time is about 3 or 4 months but I think it will be worth the wait. Thanks for the AWESOME videos. -Jim
Jim Mitchell Trust me, it will be worth it!
I was fascinated by the RAT table. It would look like I could set an angle (say seven degrees) and grind HSS bits on it. Is that possible?
For sure Wes, I dress and form HSS bits all the time on this grinder.
Ray, take your Fluke DVM that has a frequency counter mode and connect to a couple of the 3 phase leads between the VFD and the motor. 60 Hz is either going to be 1735 RPM. ** That works out to 28.9 RPM/ Hz. Generally I would not run the motor less than about 20Hz -- (578 RPM) the cooling fan doesn't provide enough air at less rpm also the motor is not too efficient below that rpm. On the high side I run my mill up to about 150 Hz with no issues. 150Hz would be around 4337 RPM. The VFD's can generally be programmed for a minimum and maximum frequency, which translates to RPM. The knob is most likely just has an arbitrary marking that linearly controls the frequency between the internal minimum and maximum limits.
** This may or may not work depending on how much of the high frequency switching frequency voltage remains on the lower motor frequency sign wave. The meter can get confused as to which you want to measure.
Great info Craig, thanks buddy, now all I need is a Fluke and i'll be of running! I'll check the motor plate, that should be a good start! Thanks again my friend!
Pretty nice setup Ray. Something else I'm lacking in the shop unfortunately. :-)
With your mad skills you can build one no problem! I would be happy to give you some specs if you choose that route. I can say you do need one or something like it, makes fab work fun again!
Curious. Why on earth would they machine down the diameter of the motor shaft instead of putting the proper size bore on the drive pulley? So they have one pulley to fit several motor sizes? Something does not seem right about that.
To keep it standard drive wheel boar size and so that you can use other manufactures drive wheels.
I bet the vfd at 100 it is approx 100% of rated rpm of the motor. that sure is a nice grinder.
How did I know you would know this off the top of your head, thanks buddy!
Left side higher.. lol. Great video though thanks a bunch!
At 60 hz the motor is spinning at nameplate rpm. So at 100 Hz the motor is running at slightly less than double the nameplate rpm. I can assume it’s a 3450 rpm motor so at 100 hz it would be running at approximately 6000 rpm.
Thanks Ken, I take a look at the motor plate and then should be able to calc SFPM and RPM. Thanks again for the info!
if your motor is 1725 rpm at 60Hz (should be on the motor plate) then at 100Hz you'll have 2875 rpm. If it is a 3450 rpm motor in that case at 100Hz will be spinning 5750 rpm.
Now, the formula is RPM=120*frequency/#poles, usually motors are rated at 60Hz in the US and 50Hz in Europe, if you use the formula a 4 pole comes to 1800 rpm and a 2 pole is at 3600 rpm at 60Hz or 3000 and 1500 rpm at 50Hz - the difference is called slip and depends on load and motor characteristics, common ones are 1725 or 3450 for 4 or 2 pole respectively. So it's all in the number of poles, based on sound in the video I think it is a 4 pole motor (so at 100 Hz close to 2900 rpm). Hope this helps.
Great info, I'll check the motor plate use these calc's and come up with the correct SFPM and RPM and report back! Thanks man!
Northridge was apparently on a mission to make every single part of this machine pretty... Never seen anything like it.
Yes, they sure did a really nice job at making it pretty but I have to say it's very tough and eats material like nobody's business!
thanks.
Glad you enjoyed! Cheers, Ray
ha, that is exactly Jeremy Schmidt`s design. he was so proud to his grinder, i though he will never sell this design to manufacturer.
This is not anybody else's design or copy of one. NRT developed his own design from scratch and machines all his own parts in house. The NRT Grinder might look like others but I can tell you its a completely different animal in a league of its own! Top notch and top quality! Thanks for tuning in!
well, you speak for yourself, i though Jeremy sell a design which he made 3 years ago, and you bitch level it up and broadcast the whole world that NRT new product *C*O*P*Y* the design. black and white in your reply. that`s it! if those features ate shit, this NRT grinder do have the SAME features, which is telling us this machine is also A PIECE OF SHIT? yea, we can see a lot of silver shiny parts, and a vfd but did not see any grinding, i am not sure how high the quality it is?
luderick wong I am sorry you feel this way and I have nothing to do with who copied who’s grinder design. I wanted a good quality grinder so I did my homework for several months and chose this NRT Grinder. I highly recommend you try this grinder before bashing it. I can not speak for the other grinder you mention since I am not familiar with it and really don’t remember it as one I was looking at before I bought this one. I would be happy to watch a video review on your RUclips Channel of the grinder you speak of, post a link so we can check it out.
Best Regards,
Ray
True That, excellent information, thanks for pointing this out and sharing! Thanks for tuning in and commenting!
would have been nice if you mentioned the price
At the time of purchase a little over two years ago, the pro package was 3K delivered.
See what the hertz rating of your motor is. Typically in the US 60Hz is the incoming supply. If the VFD is set to 60 Hz then the motor will run at the rated rpm. 120 Hz would give double the rpm.
its running at 60Hz but will have to check the motor plat for the rated RPM
What? no grinding? I wanna see sparks damn it. It doesn't look like you have even used it yet. Nice looking machine though.
Stay tuned my friend, I see some grinding in the future...
Hey, this worth wtching? At 9.48, what is the material(glass) on the flat platen jig? thaks!
Thanks man! Here you go, this is the glass install video; ruclips.net/video/x_7wJzZpi7A/видео.html
I mispronounced platen and have been corrected!
No one mentions this motor runs in REVERSE.
It will run in reverse but you have to add the reverse switch to the VFD which I did and runs fine after a little tracking adjustment.
Ray that machine is way too pretty to actually use on serious work. Put it under glass and get a down and dirty work machine. I have an old Wilton 3”X72” machine that was used for years in the construction of Rose Parade floats. It’s still going strong however the platten has been repaired with brazing somewhere along the way. When I have nothing more pressing it’s on my list to-do.
Randy
Hey Randy, I have been using the crap out this grinder for the past year but I did clean it up for this review. Sounds like you have yourself a bad ass grinder and a 3" belt must be nice! Thanks for sharing and for tuning in!
Olá amigo me passa o projeto dessa lixadeira em PDF para mim.
Hello Paulo, I am not sure what your asking for but I did not design or build this belt grinder. I bought it like you see here and use it daily!
If it was a 2 pole motor it will spin att 6000 rpm at 100hz but this is a 4 pole motor so it spins at 3000 rpm at 100hz
That makes sense, the belt does not look like its going 6000RPM more like 3000. I'll get the correct SFPM and RPM from NRT and share the info. Thanks man!
Your dial is percentage marks. 60 hertz is 100%.
Thanks for the info Chad and thanks for tuning in! Best Regards, Ray
Cadillac grinder!
Oh yea, almost as nice as yours!
Where do you hide all the mess ?? Everything looks brand new in your videos. Your "shop". Looks like a Hollywood movie set, am I missing something or is it a shameless promotion of merchandise?
Steve Callachor
North Avoca. NSW. Australia
150 degrees east. 34 degrees south, 34 degrees Celsius
Hello Steve, Thank you for your kind words! I do and try to keep up in making my tools look good and yes, they all get used often. The camera does a good job in making things look good and if you look really close you just mind find a mess in the shop. Thanks for tuning in. Best Regards, Ray