# Need help engraving aluminum **URL:** \ **Category:** Original/PRO Series (Buildbotics) (Gen 1)\ **Created:** [July 6, 2021, 6:55pm UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562 "2021-07-06T18:55:46Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Watkins](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/watkins/32/3188_2.png) [@Watkins](https://forum.onefinitycnc.com/u/Watkins)\ **Post date:** [July 6, 2021, 6:55pm UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/1 "2021-07-06T18:55:46Z")
I need to engrave (I guess) some thin marks and lines into aluminum, but my initial tests have been poor. By thin I mean 1/32 or less. I’d appreciate some tips on how to do this cleanly. Bits, speeds, depth, etc. ---
**Author:** ![ConvenientWoodwork](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/convenientwoodwork/32/22558_2.png) [@ConvenientWoodwork](https://forum.onefinitycnc.com/u/ConvenientWoodwork)\ **Post date:** [July 6, 2021, 7:10pm UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/2 "2021-07-06T19:10:16Z")
I haven’t done any on my 1F but in the industrial setting we use 1 flute or 2 flute V bits ![20210706_150727](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/a/7/a748ab99a359fc8737e4b60e9666db9cfa45c23f.jpeg) and use a single line font ![20210706_150819](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/0/1/01df3e0e66e1bd8738dab699e76840f72f1a34dc.jpeg) Can you elaborate on the issues you’ve had? ---
**Author:** ![Watkins](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/watkins/32/3188_2.png) [@Watkins](https://forum.onefinitycnc.com/u/Watkins)\ **Post date:** [July 6, 2021, 9:10pm UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/3 "2021-07-06T21:10:09Z")
Sure, here’s a photo that might help explain the problem I’m having, as well as the bit I was trying to use. I’m using Carbide Create to create the toolpath. You can see that there’s a lot of built up aluminum around the edges, so it’s really rough. Everything here is a single stroke/path with no volume, so I used a contour cut with no offset. Should I be using a different kind of toolpath? ![IMG_8324](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/a/3/a3d0928af110d670bc003c3f80ea2c4d35f7c644.jpeg) ![45622Z](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/d/9/d979827da083c272b001489a7eb1a413f4c279b9.jpeg) ---
**Author:** ![ConvenientWoodwork](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/convenientwoodwork/32/22558_2.png) [@ConvenientWoodwork](https://forum.onefinitycnc.com/u/ConvenientWoodwork)\ **Post date:** [July 6, 2021, 9:49pm UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/4 "2021-07-06T21:49:13Z")
Any amount of runout with that style of bit can cause issues. cutting data for engraves we run at work 6000-8000 RPM XY Feed 250 mm/min DOC max 0.2mm ---
**Author:** ![Watkins](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/watkins/32/3188_2.png) [@Watkins](https://forum.onefinitycnc.com/u/Watkins)\ **Post date:** [July 6, 2021, 11:46pm UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/5 "2021-07-06T23:46:16Z")
Thanks Nick. So using the non offset contour path is ok? ---
**Author:** ![ConvenientWoodwork](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/convenientwoodwork/32/22558_2.png) [@ConvenientWoodwork](https://forum.onefinitycnc.com/u/ConvenientWoodwork)\ **Post date:** [July 6, 2021, 11:55pm UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/6 "2021-07-06T23:55:02Z")
I’m not a CC user so I’m not entirely confident on that path selection, but it seems to jive with what I’d do in Fusion. Do you have an indicator that you could use to measure bit runout? A couple of thou would be more than enough to cause some burrs. The other thing would be just tweaking with feeds/speeds. @cyberreefguru did a couple of good videos recently showing a good method for determining feeds and speeds for a given material. ---
**Author:** ![Watkins](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/watkins/32/3188_2.png) [@Watkins](https://forum.onefinitycnc.com/u/Watkins)\ **Post date:** [July 7, 2021, 12:06am UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/7 "2021-07-07T00:06:36Z")
Oh man, I do not. I’m really new to this and had to look up runout! Haha. So, why the lower speed? Technically, is the aluminum melting and cooling before it can be expelled? ---
**Author:** ![ConvenientWoodwork](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/convenientwoodwork/32/22558_2.png) [@ConvenientWoodwork](https://forum.onefinitycnc.com/u/ConvenientWoodwork)\ **Post date:** [July 7, 2021, 12:35am UTC](https://forum.onefinitycnc.com/t/need-help-engraving-aluminum/6562/8 "2021-07-07T00:35:09Z")
What you are really aiming for is chip load aka inches per tooth. ![Screenshot_20210706-202308_Chrome](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/9/5/9555707eca9db01b2d58faeebc35337e7106ed0d.jpeg) For the feeds and speeds I mentioned you get a chip load of 0.0357 inches per tooth. You could also run your router at 18000 rpm and go much faster and get the same chip load. ![Screenshot_20210706-202827_Chrome](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/b/b98a77cd4f0bd9747a7ad3ab4c030c43ec2406a2.jpeg) Cutting with incorrect chip loads isn’t great for the longevity of our bits. Heat disappation is primarily via chips since we aren’t using coolant and if the heat isn’t leaving then it is staying in the bit! It’s possible that excessive heat buildup may cause some gumming up around the edges of the cut like you’re seeing, though I wouldn’t expect that with a shallow engrave.