Flattening Bit is Gouging

Post by **Vmastros** » Mon May 17, 2021 10:27 pm

I'm trying to flatten a new wasteboard. Genmitsu 3018. Spindle is tight. and bit is tight. It is a new spindle. Randomly, the bit will gouge the material and then proceed on its way. The attached photos document the setup and the gouging. The crv file is attached as well.Can anyone figure this out?Thanks.

Post by **adze_cnc** » Mon May 17, 2021 11:18 pm

Do you have an image of the material cleared of all dust?

Post by **Vmastros** » Mon May 17, 2021 11:46 pm

Yes Sir.

Post by **TomWS** » Mon May 17, 2021 11:47 pm

How is the board held down? I don't see anything holding it?

Post by **Rcnewcomb** » Tue May 18, 2021 12:07 am

Your Z plunge rate is really slow (0.025IPS= 1.5 IPM). Can your controller handle a feed rate that slow?

Post by **jfederer** » Tue May 18, 2021 12:17 am

And of course you've trammed the spindle? Not that out of tram would cause this kind of gouge, but worth asking.

Post by **TReischl** » Tue May 18, 2021 12:29 am

Those machines are not at all rigid. Not cracking on your machine because any machine is better than no machine at all. A 1 inch diameter bit is mighty big for a machine like that. Try something smaller, yea, I know, it takes longer, but that is what happens with machines lacking rigidity.

Post by **Vmastros** » Tue May 18, 2021 2:07 am

Thank you all for the replies.
1. The board is held by blue tape and CA glue, it is solid.
2. The plunge rate is slow but the controller handles it just fine.
3. No, I have not trammed the spindle.
4. I have used this bit before without problems. The machine can handle it fine. I take very shallow passes.

Could this be caused by electrical interference? Should I ground the machine? Thanks.

Post by **martin54** » Tue May 18, 2021 2:40 am

Electrical interferance can cause all sorts of problems but your machine should be grounded properly even if it isn't causing this problem, use a star configuration when earthing the machine.

As Ted has said it's a big bit on a machine that isn't the most ridged, it may well be a combination of things rather than one thing alone. You have used this bit before so it may not be as sharp now, your cutting at a fairly low speed for a spindle which means that you have a lot less torque so the combination of a big(ish) slightly dull bit cutting with a low torque might be causing the spindle to stall

Try increasing your spindle speed & obviously your feed rate as well to see if it makes any difference.

Post by **Vmastros** » Tue May 18, 2021 2:44 am

OK, thanks. I will give your suggestions a try.

Post by **Bob Jr** » Tue May 18, 2021 4:21 am

What's a star configuration?
It sounds like an important thing to know.
Thanks,
Bob

Post by **scotttarnor** » Tue May 18, 2021 5:24 am

Quick link for a star ground
https://forum.arduino.cc/t/common-groun ... e/626215/2

Vectric Customer

Flattening Bit is Gouging

Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging

Re: Flattening Bit is Gouging