Double-Wheel Hollow Grinder
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- Опубликовано: 3 окт 2024
- This video shows my double wheel grinder. It is two 1/2 HP motors running 1x42 belts. The motors are mounted on x-y vices to adjust the tracking and tension.
My website is www.lewisrazors.com
My work is sold through www.straightraz... 
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I very rarely make comments about the ,work and accomplishments of anyone on RUclips. You are an exception to the rule.Thanks for the info. I hope you stay in this for a very long time. You are what the USA was known for decades ago. The more people view your work, the more they get inspired. A catalyst for creative excellence.
All the ideas you mentioned are right on. Yes, you rough grind > heat treat > finish grind > finish work and sharpen. Yes, you can grind on a single wheel without any guides. I do most of my grinding on a singe wheel without any rests. I do mark my center line, and try to do the same thing on both sides of the blade. I would recommend joining a knife making forum such as British Blades or Blade Forums. The forums are full of great advice.
This is the first time in 20 years that I've seen this set up. Delbert Clark of Clark Knives made a grinder like this in the late 70's and it was cut up and sold in pieces after his passing. Thank you for the walk back! Nice work, by the way!
Thank you for your comment.
Pretty ingenious idea for hollow grinding blades. It allows you to get the same grind on both sides of the blade, simultaneously. I like it...
you cant beat good old solid engineers. they are a dying breed.
I am happy to hear, that you used that protection. In industrial meetings I always invest 1 to 2 days with all engineers, where we only focus onto safety issues of the industrial machines, which we have to install. Much harm can be done, if safety is neglected and therefore we should also pay much attention to it privately.
But your grinding method is great.
Very unique belt grinder. We shared this video on our homemade tools forum this week 😎
What an ingenious device. I just love seeing peoples' creativity at work--even if this machine is not currently being used. Well done, brother!
Gil Mosko I appreciate your thoughts, Thank you. I agree I am always amazed by the things people come up with. I enjoy seeing what others have made.
i honestly think this is the best invention for belt grinding a knife! it takes half as long and is much more precise. whats up with all the haters? Good work man
That is a fantastic way of hollow grinding! I'm no expert on hollow grinding, so I don't know how well the grinds come out in the end, but for time sake, this is an excellent way of doing it!
Thanks for the comment. The tool is an excellent roughing tool, but is only an OK finishing tool.
love your machine and the use of the sliding vices to adjust the belts... genuis!!!
Brilliant little piece of machinery! Sure makes the rough grinding process slick. I like the fact that the distance between wheels is adjustable.
+GlenfinnanForge Cool, I am glad you liked it.
the fun is to make it, and you enjoy it by sharing ,thanks for being generous
sam terian You are very welcome, thanks for the kind words.
@TheMuslimKiller Straight razors are honed by laying them flat on the hone. The hollow in a razor allows the edge and the spine to touch the hone. That way you do not have to hone the whole side of the of the blade. The hollow makes it a lot easier polish the edge to a razor sharp edge.
Poster child for the hollow grind. Wow man, that really cool. Thanks for sharing.
I always wondered how a Hollow Grind was made, Thanx Mr. Lewis.
+paulie 4x It is just one way of making a hollow grind, thanks for the comment.
I can't even begin to describe how genius this configuration is... have to build one a.s.a.p.
It is a good design for doing one thing, but it is not a versatile tool, now days I use a single wheel grinder for everything.
I'm impressed how cool it seems to do the work. Not much scorching on the blade and it appears hand held with nothing to protect from heat. Nice setup.
That is a good valid point, a top guard would make the machine a lot safer. If I were to let somebody other than me use the machine it would have a top guard and belt guards.
I'm pretty sure that there's a disclaimer in the "Hooked On Phonics" series that warns about the WHOLE "sounds like" vs. "spelled like" phenomena. Outstanding grinder setup. Scary as shit to imagine putting anything in from the top, but as long as the blade hasn't been ground enough to squeeze through from below, I guess you're golden.
Awesome video of a true craftsman. Ive been researching belt grinders to make my own. You just prove the old addage. Its not the tool (or the grinder) that maters, its the craftsman (atrist) behind the tool. Nice simple design.
Alamodem Thanks that is a great compliment, I worked hard at keeping the design of the grinder simple. Thank you for the comments.
@Squarerig I make razors, a hollow grind works well for razors. The hollow allows the metal behind the bevel to be very thin, this works out well for razors.
The hollow also makes honing razors easier, when you lay a razor on a stone only the spine and the bevel touch the stone it is like having a built in honing guide.
I love shaving with straight razors. I have a nice collection of vintage razors, some of which give really good shaves.
+Sam King I am with you, I love shaving with my vintage razors.
The wheels in the video are caster wheels from the farm supply store that have been thinned out, trued, balanced, and had bearings put in them. Sunray also makes good wheels.
Brilliant design. I liked the blade right up to the last grinding, when it had the un-ground section. But all the same, great work.
But lewis like you said, you quite confident in the use and if anybody else would use it it would have a guard. I didn't say thanks in my comment - So thanks for posting its a very intriguing setup - I love it ;)
I have got to make one of those! I've been doing it the hard way all these years. Nice setup.
If I stick it from the top. The blade pops through really fast and scares me. LIke you said it can ruin a blade. The grinder has enough flex in it to let the blade through without breaking.
My heart rate jumps and I am wide awake for awhile, but it is not a disaster.
I am doing the first grinding before the hardening and quenching. I am not worried about overheating the metal.
After hardening and tempering I use water coolant system to keep the blade cool.
That sounds like a cool grinder, those are big motors. I agree with you about the safety aspects. I would like to see you grinder it sounds like a good tool.
I am always changing my progression of belts trying to find the best setup. Now I am going 60-220-400-800 It seem to be working for me.
@wvblade I understand gathering parts, I am always thinking of things to build. The little jig is all-thread and an all-thread coupler that I silver soldered together. I just happened to have the all-thread laying around so that is what I made my rest out of, it could be made any number of ways.
I have a lot more control over the shape of the hollows on a single wheel grinder. When I grind razors the hollow does not usually conform to the shape of the contact wheel. I tend to grind the area behind the edge and first bit of the blade a bit thin. It is easier for me to do on a singe wheel grinder. I just have more control over what I am doing on a single wheel grinder.
I have a lot more control over the shape of the hollows on a single wheel grinder. When I grind razors the hollow does not usually conform to the shape of the contact wheel. I tend to grind the area behind the edge and first bit of the blade a bit thin. It is easier for me to do on a singe wheel grinder. I just have more control over what I am doing on a single wheel grinder.
@Duckyistrippin The wheels are cast steel caster wheels. They were trued, cut to width, and had bearings put in them at a machine shop.
Neat set up! I didn't think it really existed. Cool!
Thanks
The wheels are spinning so that they push the blade out. If the blade snagged on a belt it would pull it out of the wheels and down toward the table.
Exactly. Apart from the fact that the grinder is working with open belts (i.e. you can stick your fingers between belt and wheel) this is as safe as can be.
They are 1/2 hp motors they spin in opposite directions the way that are wired changes their direction of rotation.
Neat the way that the belts stay true on the pulleys.
Good observation, but I was rough grinding, the blade has not been heat treated yet.
After heat treat I would go slower and not let the blade get hot and change color. Before heat treating I am not worried to much about over heating the blade. The blade is going to be heated red hot during the heat treat process.
You are right it is just a couple of belt sanders. Knife makers and blade makers tend to call the big belt sanders, grinders. It is just a terminology thing. So in my world it is a grinder.
I am a fan of old fashion plain carbon steels and some alloyed carbon steels. I do use stainless on occasion I use cpm154 or AEBL. Most of the knife supply companies sell small supplies of steel. I buy from various sources, mainly New Jersey steel baron, or Admiral steel.
My advice would be make a few knives our of a plain steel like 1080 or 1084, then move on to more exotic steels if you want to.
@PainlessShadow That was one of the first steps, There is still heat treat, final grinding, and honing before the blade will cut anything.
Very effective setup, nice job ! Couldn't be more simple
Thanks
You are right a guard would be the prudent thing to do. If I were going to let other people use it I definitely put a guard on it.
I use 1x42 belts, with the low grit belts I can get about three blades done. With 150 grit and up it is one blade per set of belts.
Now I have to go look for bicycle burn out videos. There is always something new to learn about.
@zedafaca123 They are 1725 rpm, ½ horsepower motors. The drive pulleys are 3” inch in diameter.
I am in the same boat with you. I watch other peoples videos and say to my self I can do that. But, then I try it and find out it is not as easy it looks.
@MrBrander Those are all good, valid points. At the time I made this, it is what worked out the easiest for me to put together.
The wheels are spinning downward you have to pull the blade up into the wheels.
If I make a mistake and put a blade in from the top it just pops through the wheels, it is not a dramatic action.
Thank you for the kind words.
I mark the center line and lay out lines when I use the single wheel grinder. I have more control grinding up to the lines with the single wheel, I am not sure why it is just the way I work best.
I have used water before when doing the final grinding, there is a tray to catch the water on the double wheel grinder. Some times I use water when final grinding sometimes I do not, it depends on what kind of belts I am using.
It was annealed O1 tool steel. That is the way it looks when you grind it. A steel like 1095 or W2 would have shown more sparks.
Yes I have seen the videos. I do not know what the wheel are made of. My guess would be that they are some sort of bonded aluminum oxide.
That's pretty cool.. Never seen a grinder like that before..
+tommy23490 Glad you liked it,
You are right I did a stock removal blade with no forging to show how the grinder worked.
That's why you use it from the bottom side, where the wheels are spinning away from you. I saw a buddy of mine get his thumb pulled through the corner of a cylindrical grinder once. A part he was feeding onto the rest spun out and pulled his thumb between the rest and the corner of the stone. No need to tell you it made a mess of his thumb. I imagine this double sander configuration you have would do similarly if you came down through the top side...it would pull you through the wheels. OUCH!
@lewisrazors OK, I have a vertical sander, and a bunch of 1X42's...I like Klingspor, a German made belt...middle of the range on price, not too agressive on the material removal, but very long life. I've used a lot of their abrasives in my jobs as welder and machinist/mechanic on a variety of industrial stuff, so I needed the good quality.
Klingspor sells retail, but has $50 minimum. If you can get any, I think you'll like them. They make belts, disc's, hard wheels, cur-off's.
The wheels are spinning so that they are pushing the blade away and down toward the table.
If someone other that me were using the grinder I would put on a guard on the the top side of the the wheels to prevent accidents.
The blade I am grinding has not been quenched and tempered yet. After heat treat I would go slower and use water to cool the blade.
I dipped the blade in a bucket pretty often. The video did does not show that to well. I dip in the bucket when it starts getting hot on my hands.
@dougspair The belts are 1X42 belts, the are generic ceramic belts I buy them from various sources, I shop around and try to get my belts when there is a sell going on.
This is good stuff, you make it look so easy. I'm going to have to make one. Thank you. SEMPER FI
Jerry L sorrells Thanks for the kind comment.
okay thanks for the quick reply. Didn't realize that it was going downward. Thanks again for posting.
That is so cool. Love that double grinder mate
I do all of the rough / pre-heat-treat grinding dry. I will sometimes use water on the fine grits.
@Veikra There is a short learning curve to using a straight razor, but it is not that hard. There is a lot of information on straight razors at the Straight Razor Place forums
@MrSheissen1 The wheels are pushing the blade out, not pulling it in.
удобный станок,не надо думать с наклоном.
это точно
@Aizura77 Yes, I could stick my finger in it, there is no guard, but I do not think that I will. If I were building the grinder for other people to use it would have proper safe guards.
One side is threaded, the other is a tight fit around the cap screws.
@marcus460 They are x y vices, from the import tool store.
Wonderful Lewis. It's a stroke!! You said you no longer use the double grinder. . .How do you get a precise bevel with only one grinding wheel going. I was also wondering what would keep you from feeding water from the top on each wheel to keep the the heat down. . . since both wheels are running down and the excess water could be caught and drained. I love your videos Lewis. I learn something with every one. Thank you so much for sharing!
Personally, I like that Dovo Gentleman's 5/8" set you have - but guess the wife isn't getting that 'holiday hint' good enough... Beautiful razors, though.
No, I have not run my finger through the wheels. I have run a blade through the top side. The blade just pops through it is not very dramatic.
Hey some good cheap sources of metal for tools are: leaf springs, old files (might cost you a small fortune grinding it smooth) best I've ever had was part of a old blade from a sawmill resaw/bandsaw... Look up how to test metal to see if it is high carbon steel. Easiest way I know is to put to the grinder and look at the quality of the sparks! Best of luck!
GOOD IDEA KEEPING TWO GRINDING WHEELS SIDE BY SIDE .
THANKS FOR YOUR VIDEO
R.K Radhakrishnan You are welcome.
I do not know where to find shaped blanks. I think Jantz knife suppl, and some other knife supply stores sell knife blades only without handles. The are completed blades not blanks. I do not know where to find blanks.
I have accidentally put a blade in the top before. I will definitely wake you up, but is is not a disaster. The blade pops through and lands on the surface below the wheels.
I shouldnt have watched this video, now Im doomed to building one of these contraptions!!!! I must say thats bad ass.
I do not use mine anymore, I use a single wheel now days. It is a good machine for roughing work, but not very good in the finishing.
I was rough grinding a straight razor. The rough grinding is not a precise operation. The precision grinding comes later in the process after heat treatment. What I showed was of the preliminary steps to get the initial shape.
is it possible that the knife you're about to grind is wet or have some cooling into it so that it will not heat up? heating make the knife become soft and remove it's sharpen ability some sort of things..you know what i mean..thanks nice vids..!
You have great problem-solving skills and enviable ingenuity. I also like your razors, but I've said that before. The grinder is amazing. Wish I had room in my workshop for one like it. I see you have your share of comments from the immature dits that can only get attention by saying stupid things. I'll bet they make momma proud. *facepalm*
Thanks for posting this, answers alot of questions I had.
I was waiting to see you use the blade to see how well it can cut.
Good idea using 2 Belt Disc Sanders to sharpen the blade ! But, it may need frequent change of belts in production !
Yes, it does go through belts
That sharpener is awesome!!
I was wearing a full face respirator while grinding. I added my voice at a later date after editing the video. You are right about the pinch points. If I were to let other people use my grinder I would have the proper guards in place.
@BrothersFreedive Only if you have one of the ultra rare Bic straight razors.
Thank you, I appreciate the encouragement.
Yes that is fun for the first ten times, after that not so much :)
Thank you very much, that is a very encouraging comment.
Really? is that the best you can think of?
I bet they get a little warm when grinding. If you could make a reciprocating jig you could automate the process.
Mainly I use high carbon steels, 1095,O1 w2, 1084. On occasion I will also use cpm154
So this means the size of the Wheel(s) can be used to create the depth and amount of Hollow Gind desired for a Blade.
@Veikra For me an edge last about 2 months, before I do a small touch up on a hone. Yes I use a leather strop to maintain my razors. I use a strop and shave in some of my other videos.
That sounds like a good idea for a blade. I do not take custom orders.
@alby94444 Yes, the motors are wired to be able to change directions.
It is harder to see what I am grinding when the spine of the blade is facing up. All of the sparks and dust also fly up in the air toward my face when the motors are spinning in reverse.
I tried having the wheels go in both directions but found I did better job when they are spinning downward in middle.