CNC Router - What Causes Tearout, Burn & Broken or Burnt Bits on Your CNC Projects, Cuts Rough
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- Опубликовано: 27 июл 2024
- This CNC router video tutorial explains the causes of bad cuts with your CNC router as you are cutting the projects, and why your router bits are breaking or getting burned. You may be having tearout, burns in your cuts, or your CNC router bits are breaking or getting burnt.
It may seem that no matter what speed, feed, or depth of cut change you make, you can't stop the problem. Here is why...
There are three primary reasons for burning, breaking router bits, and tear out.
→ The router bit is getting dull, or worn out
A dull router bit is like a dull knife. It has to work much harder and leaves rough cuts in the wood.
→ Your feeds and speeds settings are not set right for the router bit.
Feeds & speeds must match the router bit. Too much feed, and the router bit can break. Too little feed and the router bit will rub through the cut in your CNC project.
→ The spindle is running backward
A backward running CNC router spindle is simply rubbing the wood. It is literally burning its way through the cut. This is usually due to a miswired spindle.
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RESOURCES NOTED IN THIS VIDEO
Longmill CNC Router review video → • Video
Replace worn or broken bits → idcwoodcraft.com/cnc-router-b...
PDF of all videos on this channel → bit.ly/3mLHGfI
Feeds & Speeds table download → bit.ly/3xiLebv
Video to get Vectric tool library database → • How To Install A CNC R...
#cnc #cncrouters #cncforbeginners #router bits #cncrouterbits
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LONGMILL CNC ROUTER WEBSITE:
sienci.com/product/longmill-m...
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ROUTER BITS FOR CNC ROUTERS
→ 8-pc carbide CNC router bit set (w/ free vector files) bit.ly/3d1iQnF
→ 1” Surfacing bit required for surfacing your spoil board: bit.ly/2QEYLKz
***Use this discount code (SURFACING BIT)
→ Glass engraving drag bit: bit.ly/3tRy98s
OTHER ‘MUST HAVES’ FOR CNC ROUTERS
→ Calipers: amzn.to/338MAt3
→ Hearing protection (plugs don't work): amzn.to/2Hs1RgW
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Recommended Design Software
→ Vcarve Pro (RECOMMENDED)→ bit.ly/3d4WrEU
→ Vcarve Desktop → bit.ly/3D4CwjH
→ Vectric Aspire → shrsl.com/37pw9
→ Cut2D Desktop → shrsl.com/36xfm
→ Carveco (budget) → bit.ly/37rhVbY
___________________________
Starbond CA Glue Products
GET 10% OFF when you use this discount code: IDCWOODCRAFT
Starbond link: bit.ly/3g81RRU
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Unique PNG's and SVG's and other designs for you to create
Vexels → www.vexels.com/?ref=idcwoodcraft
_____________________________
MAKING MONEY WITH A CNC
Words are the top-selling items of all time with CNC products. Get the free WORDS THAT SELL list: idcwoodcraft.com/cnc-lp-1/
Join CNC ENTREPRENEURS Facebook group: / cncentrepreneurs
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CNC FREE STUFF AND MORE
CNC Insiders sign up (free files and more): idcwoodcraft.com/cnc-lp2-free...
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NEW TO CNC OR STUCK IN A PROJECT?
Schedule one-on-one time with me: idcwoodcraft.com/for-beginners/
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PLAYLISTS
CNC FOR BEGINNERS: bit.ly/3rg4WTl
CNC ENTREPRENEURS: bit.ly/3mxz6Ok
VECTRIC VCARVE & ASPIRE TUTORIALS FOR BEGINNERS: bit.ly/3pdmFsi
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If you currently own a CNC router, please take a moment to take this survey to share your experience with it: bit.ly/3r5XzNh
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Cool vector files for CNC router & CNC laser: etsy.me/3oxX79l
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Learn how to start an online business from scratch: bit.ly/2ZUEIKK
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CNC FOR BEGINNERS PODCAST: anchor.fm/cnc-for-beginners
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Garrett Fromme
Facebook: IDCWoodcraft
Website: www.idcwoodcraft.com
Email: support@idcwoodcraft.com
Download the PDF of all videos on this channel → bit.ly/3mLHGfI
I just got my CNC and your videos are a lifesaver. It’s so confusing for newbies.
Hi Chris, I'm happy to be a part of your CNC journey and hopefully make the processes a little less confusing!
☕ 👍 Newbies get frustrated enough to throw their hands up and quit when faced with these issues. You probably saved them from that fate. Thanks. I'm still here, quietly sitting in the background and monitoring your success. However, humor occasionally seems to get the better of me and I have to share.
William, thanks for sticking around my friend! I love your humor. Hopefully I can save some of our newbie CNC brothers and sisters from throwing in the towel! I know we've all felt that way at one time or another, keep up the good work brother!
To be fair Garrett, I posted a gig on one of your tutorials, I am now going to go through list, find the ones I watched and post some kudos. This one I learned from and it might of been the one that led me to buying your bits.
Charles, awesome! Thanks for the support brother! Glad the videos have been helpful for you my friend!
Garrett, as always your videos are helpful and amazing!
Brave Heart, Your very welcome my friend.
Nice topic Garrett! And so many thanks fot the docs.
Roman, Im glad this helped! You're so welcome.
You saved me I didnt even know my chinese brand spindle had a reverse...I didnt believe you at first then I was like this man seemed solid on what he said so Im going to check it and you are right..spindle was on reverse I must have hit the button the move it to reverse I would have never thought. Thank you Sir for the great video
David, I'm glad you checked! Happy to help, I know it's a really common thing on these machines.
Agree there is something going on with NWA quality control department. Took them three tries to send me a mini 4th axis kit that didn’t have Mfg defects. Understand things happen, but three times on the same kit?
Now, they did make it right, so 👍 to them
Great to hear JR, glad that it got fixed for you at the end of the day. Maybe it was a bad lot? And they just kept sending you parts from the same lot.
I’m grateful for these contents you’re posting. Thanks for taking your time to help us to become good at this skill set. Thanks for always responding to my questions even if they are silly to others, I really appreciate it and it helps me out a lot too.
Franklyn, you're so welcome! No question is a silly question, keep them coming, I'm always happy to help!
Nice video, very informative Garrett.
Its good to know these kind of things for sure. 👍
Thank you for posting this.
Joe, Im happy to hear that this helped you!
Garrett, great information as always.
Paul, I'm always happy to help!
As always….. very helpful video.
John, thanks brother! Glad to help!
Perfect. Well explained. Thanks
thebigsnifter9145, You're welcome! If you have any more questions, feel free to ask!
Thank you for the information.
Im happy to hear that this helped you Jonathan!
Great information. Thanks
Kurt, you're so welcome! Glad to help!
Great videos! I've been researching cnc machines for the last couple months and it was quite overwhelming at first, but your in depth videos really helped. I finally just ordered a Longmill, can't wait to get it and start making!
Kris, thanks and I'm glad I can help! Congrats on your longmill purchase! I'm excited for you to get it in hand and to see what you make with it!
great video, keep em coming!!
Brandon, thanks! Will do!
Good information as always
Steve, thanks brother!
Excellent video as always, Garrett! Things aren't going wrong for me at the moment but this kind of info will keep me educated in case something does come up!!!
Michael, thanks brother! I'm glad things are smooth sailing for you. I have fingers crossed that it will stay that way and if not you'll know what to do my friend!
You totally nailed it for me Garrett. My Bulkman 2.2KW Water cooled was running backwards. I wired it up per a youtube tutorial and this is my second spindle. First one exploded as soon as it touched the wood. This time at least I kept feeds and speeds super slow with MDF
Blaine, it happens to the best of us. Complex electrical components feel like magic sometimes, especially if they are three phase like a spindle. Glad you got it sorted!
Hi! Probaly I have seen the same video, since looks like my spindle spins in backward (counterclockwise) directoin when I set M3 (clockwise) rotation command. Could you please share the right wiring ( I also have the Bulkman 2.2KW Water cooled spindle)? My current wiring is U for 1 pin, V for 2 pin, W for 3 pin
@@VSongu are you still needing this? I have been moving and the CNC is still in a box but I can get the controller out and post a picture of the wiring if u need it still.
As always a very informative video!! Much appreciate your efforts in these videos. I have learned so much from watching your videos. Thanks again!!
David, you're so welcome! I'm glad it was helpful for you!
thank you very much. This helped me.
kamilerol2845, you're so welcome! I'm glad it was helpful for you!
Thank you Garrett. Recently purchased Carbide 3D Shapeoko 5 Pro with VFD Spindle. I was buring through everything and after watching this video I went out to check and sure enough spindle was spinning counterclockwise. Contacted Carbide 3D support and they shipped out new spindle the next day. Thanks again.
Jlawsmomo, you're so welcome brother! I'm glad to help!
Another valuable lesson
DerekGranger, glad to hear this one helped you my friend.
good brake down, thank yoiu
Edwin, happy to hear that this helped you.
As always very informative and accurate.
I used to work on a Homag venture 2, and you could actually set clockwise or counterclockwise for every different tool, on the tool library.
Mitsos, thanks I'm glad you enjoyed it! That sounds awesome, I'm jealous I wish I could set that in mine! That would be super helpful for those bits I was talking about in this video!
Thanks for the metric table 👍
No problem Tiago! I always try my best to think about my brother and sister CNC'er overseas!
Wow..thanks again for another great video. I have the Shark CNC that came with the free spindle. I haven’t hooked up the spindle yet as I’m still learning and wanted to experiment with the router before I used the spindle. I’ll be sure to check out the rotation before set up and cut with the spindle. Thanks Garret
Thats a great idea Martha. Im glad this helped! Congrats on the shark CNC!
Nice video Garrett. My Shark HD520 came with a water-cooled spindle rebate. But before I got the spindle, I was using a DeWalt 618 router as my cutter. I had no issues with the projects I ran with the DeWalt router. After I received my spindle from Next Wave, I installed the spindle and have everything configured according to instructions and was all set to carve out a 2’ wide yard ornament Thanksgiving turkey from plywood. I put in my 1/8 inch down cut EM to make some shallow interior cuts and noticed big time tear out leaving long strings along the tool path. Smoke from the bit. Loud screeching coming from the bit. I asked myself why in hell is the wood tearing upward when I’m using a downcut bit? It occurred to me that maybe the bit is turning backwards. I didn’t know which way it was supposed to turn. I got my trusty DeWalt router out and turned it on for a second to see which way it turned and it was turning as you looked from the top down clockwise. I turned my cnc spindle back on and sure enough, it was turning counter clockwise. I called Next Wave customer service and told them what was going on and they said they had gotten a batch of reverse wired spindles and sent me a detailed email of how to fix it. I just had to reverse two wires in the vfd controller box. It was aggravating but easy enough to fix. Every time I have had question for Next Wave, they’ve been very responsive. I’m glad you posted this video. It should help people troubleshoot some of these problems themselves. 👍
Im happy to hear that you figured it out in the end Douglas. Those VFD powered spindles can be tricky to wire up! Its always good to have a trusty DeWalt on standby incase you need it isnt it?
tear out could also be using an upcut spiral bit when you want a downcut.
Garry, very true brother! Good point!
Hi Garrett, I just want to thank you for your great cnc bits. I have purchased some Amanda bits there packaging does not indicate what kind of bits only by part# you’re a bits Are clearly marked such a convenience I almost can’t stand it by the way I finally got my CNC machine running from Stepcraft I bought a M 1000 I had some issues in the beginning because I’m very new to CNC however Stepcraft has a great support group and videos very happy with it I’ve made some really neat projects from all YOUR helpful videos thank you again.
Right on Grampa1999. Im glad that you like them. Others have told me the same thing about Amana bits too. Don't get me wrong, they are great bits too but just like you said, who knows what your looking at half the time!
Grateful for all your help and knowledge to help us newbies. Question? Looked at your site this morning, could you give me some insight on 120 degree v bit and best use for it? Thinking about adding that bit to your package deal. Thanks for all you do to help and look forward to your next video.
This video should answer your question
ruclips.net/video/L-mCsobn0nc/видео.html
Dull cutting tools can cause tear out, burning or numerous other problems. Using carbide tooling will have your cutting tools last longer. Carbide is simply harder and will stand up longer in abrasive woods and other materials. Taking too heavy a depth cut, especially when cutting a slot cut at too high a feed rate can cause the tool to choke. It can just not evacuate the material fast enough to continue the cut. The material can pack up in the tool flutes and prevent cutting. That can mean burning, tool breakage and piece damage.
A spindle rotating the wrong direction for the cutting tool being used will never work. When viewing your spindle from the top, the spindle should be rotating clockwise. I have a CNC Shark. My spindle router rotates the correct way. One of the nice things about the Shark, is it turns the spindle or router on and off for you. However if it is making the spindle turn the wrong direction, obviously that is not good. However in the settings on the pendant, there is a reverse polarity feature. Reverse the polarity and problem solved. I don't know why some routers need to have the polarity reversed, but that should fix it.
CNC Programmer, wow thanks for such an in depth response. You made some really good points about causing the tool to choke. I'm glad you didn't have this experience of the spindle going backwards on your Shark! Thanks for sharing the change polarity feature, I'm sure this will help a lot of our CNC brothers and sisters out!
You’ve gone over a lot of very useful information in your video’s. One question that I have is, when is it a good time to use a down cut bit?
Hey Dan. I would use a down bit almost all the time except when I'm cutting all the way thru. In that case, I would use a compression bit (like this → bit.ly/3O8yKvO).
Btw, how did you find this video helpful?
Requesting videos on 4th axis work! Especially modelling and unwrapping using free software
Matt, I like what you're thinking. I'll add it to my list!
Garrett, you're an absolute legend. My self-built cnc was turning anti-clockwise and I would have tried 10 other things before that setting. Thanks for saving my CNC. Subscribed!
Tim, glad to hear that this video saved your CNC my friend. Now get to cutting out some cool projects!
Thank you for all the videos you make. Very helpful and informative. great appreciated. One question. Why does the Longmill only have a 90 day warranty> Everybody else does a year. Thats a big difference. That is whats holding me up on the Longmill purchase.
Thats a good question Bill. You might want to reach out to Longmill on that one and see why that is!
Man I set up my cnc router and thought everything was good to go. I start cutting holes in my spoil board. when I cut them there was burning and the smell was bad of course, but i fought thru it adjusting feeds and speeds. I would have a mound of stringy fibers where I was cutting (i just knew something was'nt right ). One night I was laying in bed and something hit me. CHECK THE ROTATION OF THE SPINDLE. I put some painters tape on the spindle and boom it was spinning backwards the whole time. Easy fix but my only quarter in bit was burnt (sad face). Sure wish I would have watched this particular video a little bit earlier lol
tnsfinest, glad to hear this one helped you brother! Now you are set to go to make some serious cuts with your machine.
Thanks for another great video. Garrett this came to mind as you were speaking ....if you are using a router on your CNC, what is the norm run time a project should be? Because if you have a project with a run time of 2 hrs for example (as calculated by the software) and you need to change bits along the way, the router is generating heat for a prolonged time. Do ya stop , decrease the number of passes, or take long breaks between projects? Because this eventually will breakdown the router, possibly break the bit and make it difficult to change the router bits due to heat or something else. When is enough is enough to stop the router to cool down? What is your take on this? Thanks
That is a great question Max. Project length doesn't really matter for the most part as long as you are cutting within recommended feeds and speeds for the router bit and getting good chip evacuation, you will not see any heat buildup in the end mill that it is not designed for. Stepper motors that are attached to the CNC can run almost continually for days on end if you ask them and still work perfect. It's when you start to overload the CNC and ask it to perform cuts that are beyond the scope of its design is when you start having problems. Two hours though? No problem! Cut away my friend!
Yes the router/spindle usually turns clockwise. Unfortunately, you didn't mention the reference on the router, i.e. looking at the counter from the back or from the front (where the bit is inserted). The bit turns clockwise if you are looking at it from the back of the router. It turns counter-clockwise if you're lookin at it from the front (where the bit is inserted). Right?
Dave, I see what you mean brother. You're right I probably should have specified. But when you're looking at the router from the top where the fan is, it should be spinning clockwise! If you look at it from where the bit is inserted, it's counterclockwise!
I wish I watched this video sooner. My Makita router overheated again and now is pulsating in and out at slow and higher speeds. My guess now after watching this video is that my bits are dull, which makes sense since I have not sharpened or bought any new ones since I started using my cnc a year ago. You mentioned that you cant really sharpen a spiral bit, but what about a ballnose bit, or would that also fall into a spiral bit category?
JCraftvfx, so glad to hear this video helped you brother. You are correct about the ball nose bit and sharpening. It typically is not economical to sharpen bits after you use them.
@@IDCWoodcraft Could a core box ballnose bit be used instead of a spiral ballnose bit? A bit that I could actually potentially sharpen since its got straight edges.
You bailed me out. My spindle was going the wrong way. Does your Speed and Feed chart include my watered cooled spindle by BNR?
Hi Jene. The feeds and speeds database will work with any machine. I'm glad this video showed you where to look.
Why is it that sometimes when I select a vector and then try to calculate a toolpath a message pops up saying no vectors are selected.
Hi Bernie. That happens Because you haven't selected vectors for the toolpath to generate on
But I clearly clicked on a vector just like you clicking on the rectangle or the square and you see it's highlighted but it gives you that message. Of course in your video you did forget to click on it at first. I'm using aspire
My 4mm ball nose was throwing a bit of smoke when cutting a 3d shape
Do i need to reduce rpm?
BL4NK, try increasing your feedrate brother!
Hey Garrett, quick question I’ve been running a porter cable 27,000rpm router with an ssd relay to my mainboard i was wondering why my spindle wont run effectively below 24,000rpm im trying to get down to atleast 20,000 but it jumps. My spindle is running clockwise aswell i just cant seem to control the speed I’ve been running faster feeds but still burn marks any idea?
llluckyent.9133, I'm not too sure on this one my friend. It's a little tricky to troubleshoot over comments. I recommend reaching out to your machine manufacturer on this one. They should be able to give you a little better guidance on this one!
I'm facing an annoying problem in which the router bit is leaving an impression of the tool path it has taken. I have tried everything I can but nothing seems to work. How can I fix this?
Hey Josh, I recommend you check out this video → ruclips.net/video/ZbV28AB6lsk/видео.html. I think you'll find it super helpful!
can you help diagnose a problem? I cant leave a picture but its fairly easy to explain....... When Im using an endmill I cant see any chatter in the workpiece, but when Im using a big 90 degree V bit it "appears" the bit is moving up and down, which is really easy to tell when using V bits as Im sure you already know..lol. When im using the V bit and I miled a bunch of circles and it only occurs in one small part of the circle, maybe about 30 degrees of it and allways in the same spot. I checked to see if any parts, bolts /screws were loose and if the spindle had any movement and everything appears really tight. I dont understand whats causing this. the only thing i could think is i used tape and crazy glue to fasten workpiece which was pine wood. Please put me out of my misery and help a Canadian out. Thanks very much.
Hi CNC Driver, have you considered reducing your feedrate? It might help your issue with chatter. Maybe your overdriving the machine and it cant handle the feedrate that your giving it.
I really wonder how do you cut with feed=35 inch/min and speed=22000 rpm when use 1/8 Downcut with 2 flute (derived from your pdf), with the same parameters and the bit I get strong burning?
Vitality, those numbers should work really well for you. Ensure that your spindle isnt running backwards.
@@IDCWoodcraft Garrett, thank you for your kind response! Yes, my spindle should spin in the right direction, otherwise an end mill would break immediately as soon as it touches wood. I have tried to execute essentially more aggressive penetration with this 1/8" bit utilising Cutting feed = 70 inch/min, Speed=18000 rpm, Feed per tooth 0.002 inch/tooth, and it looks decent but my bit has broken prematurely after several metres.
@@IDCWoodcraft You are totally right, It's my bad. Really my spindle spun in the backward direction
Could you please update the link for Feeds & Speeds table download. I get 403 forbidden when I click on it. Thanks
Jimb, I will do that right away brother! Thanks for pointing that out. Here is a link I just tested that should work: bit.ly/3xiLebv
@@IDCWoodcraft Thank you!
c4a
TheDustyShed, right on!
How about a screaming bit
ae86luy, I'm not too sure what you mean on this one my friend?
@@IDCWoodcraft sorry about that yes makes no sense what i meant was the whistling sound that the bit makes when doing radious cuts
I cut mostly plywood