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Post by xusmcx on Jul 5, 2018 0:44:58 GMT
I am a CNC beginner and am currently having a problem with my Carver King. I was hoping one of you gentlemen have seen this problem before and could point me in the right direction to correct this. I mostly cut 2D cuts and just recently started playing with 3D carving. I am experiencing vary poor 3D finish cuts and this looks like to be a problem in the Z axis. What I don't know is if this is a mechanical issue with my cnc or could this be due to the g code and driving the cut too fast. The finish cut was done with a .125 ball nose and the cut parameters were spindle speed 18000, feed rate 50 IPM, and plunge rate 20 IPM. Any direction that anyone has would be greatly appreciated.
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Post by Derek the Admin on Jul 5, 2018 1:46:39 GMT
I’m assuming it was moving left to right or right to left. Is that correct? Settings aren’t bad. It’s the same reason any axis would slip, not just the Z. There is misalignment in the Z, a V wheels too tight, a coupler that is loose on the motor or screw, driver set too low delivering too little power, driver set too high delivering too much power and overheating and causing a momentary shutdown, or Z rails aren’t parallel. I’d suggest moving the Z through the range with your thumb turning the coupler to see if you notice any catches anywhere or difficulty turning.. I’d also suggest checking voltage on that Z driver and making sure the set screws are tight on the coupler.
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Post by xusmcx on Jul 7, 2018 3:13:35 GMT
This was a left to right cut. I have adjusted the rails on the z axis and also re-adjusted all the v wheels. After the adjustment I made a new cut and this did make a difference on the cut. I am thinking at this point to get a better cut I would have to use a smaller diameter bit. I do have not so clean cuts around the eyes is there anyway that I can correct this? THANK YOU Derek.
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Post by Derek the Admin on Jul 7, 2018 4:06:08 GMT
That I bet is more of a matter of the cutting strategy and some steep Z plunge. What program are you using for this?
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Post by xusmcx on Jul 7, 2018 4:34:22 GMT
I am using Vectric Aspire. The plunge rate on the bit was 15 IPM and the cut pattern was a raster cut which is the left to right cut. Below are the cutting parameters for the bit but I did manually set the spindle speed to 18000 instead of 12000.
Attachments:
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Post by Derek the Admin on Jul 7, 2018 14:02:25 GMT
Okay. I think it's just the abrupt Z change causing tear out. Unless you were to use a waterline type strategy versus a raster type strategy, I think you'll just have to hit that area with some sandpaper.
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Post by xusmcx on Jul 7, 2018 15:27:41 GMT
I do have an option for a offset circular cut with CW or CCW. I will try these cut strategies see if they will fix the tear out. Thank you.
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Post by xusmcx on Jul 9, 2018 15:28:42 GMT
I think I have everything adjusted correctly on my carver king now. After all the checks suggested by Derek this has made a big difference in my cutting. Thank you again Derek.
All z axis adjustments. Loosened up the v wheels and re-tightened. Checked one z rail for perpendicular to the spoiler-board. Loosened up the other side of the z axis rails and set the distance so both rails were parallel. This required calipers for measurements and wood clamps to hold the z rails while tightening down the z rail bolts.
This is a large cut 11x15 inches with a fast rough 3d and fast finish 3d offset cut. Requires just light sanding now.
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Post by Derek the Admin on Jul 9, 2018 16:24:24 GMT
I'm glad that I could help. That turned out great. Congrats on a cool project.
Are you planning to stain or paint it?
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Post by xusmcx on Jul 10, 2018 13:35:55 GMT
I'm glad that I could help. That turned out great. Congrats on a cool project. Are you planning to stain or paint it? I do plan on painting them like the US flag or maybe the police flag with the center blue strip. This was still a test the next will be double the thickness. |
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