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5mm holes chipping out in melamine

11/25/14       
Tim Kulin Member

We've been using the same brand of Melamine (Roucke) and 5mm drills (Vortex) in our CNC for years. The combination has consistently yielded nice clean holes.

A month or so ago, everything changed and now we can't drill a clean hole. We've been back and forth with Vortex trying different drills with no success. We've swapped collets and tool holders.

This is in a spindle, we don't run a drill bank.

I'm now suspicious of the melamine, and I have a call in to Roucke.

If it's the material, what changes to spindle speed and feed rate should I try? We're running 3,000 RPM and the feed rate is 150. No pecking.

If it's not the material, I don't know what else to check. Any ideas?

11/25/14       #2: 5mm holes chipping out in melamine ...
Brian Personett

I believe Vortex sells CMT boring bits, at least that's what I've gotten from them.

I would suspect the melamine. You will not get an answer on the board other than it's the tooling's fault.

11/25/14       #3: 5mm holes chipping out in melamine ...
Tim Kulin Member

Long and painful experimentation has ruled out the melamine and the CNC. We're pretty sure it's the tools. I've ordered a handful from another supplier (Amana) and we shall see if they perform.

11/25/14       #4: 5mm holes chipping out in melamine ...
Kerry Fullington

Website: http://www.hightechcabinets.com

Tim,

We use Vortex 1206 bits, 150 plunge at 13600 rpm
Never any problems.
I could probably slow the spindle a little bit but I am not burning the bits and I get clean holes so I leave it alone.

11/26/14       #5: 5mm holes chipping out in melamine ...
cabinetmaker

Fly cut the spoil board so it is flat.

Take a machinist level and check for a level bed.

Have you replaced the tool col let lately and are you using a torque wrench ? And are you over torquing creating eccentricity ?

11/26/14       #6: 5mm holes chipping out in melamine ...
Gerry

We switched to solid carbide brad points and have never gotten any chipping again. We used to get chipping in some boards, but not others, but with solid carbide, we don't get any chipping. And on top of that, we haven't changed bits in over two years.
This is in a drill bank, and we used to change bits every few months.

12/1/14       #8: 5mm holes chipping out in melamine ...
Tim Kulin Member

This is driving me nuts. We've tried different tools, collets, and tool holders. All to no avail. We have some solid carbide drills coming, but they're not here yet.

I increased spindle speed to 4,000rpm and reduced the feed rate by half, and we're now getting clean holes. I have no explanation as to why that was necessary.

Almost as a joke, we chucked a drill into a DeWalt cordless. On low speed and pushing down hard, the drill cuts nice clean holes. You really have to work at it to get a hole to chip. It's amazing to me that we can so readily chip out holes with a cnc when we can hardly duplicate the phenomenon with a hand drill turning 400 rpm.

12/1/14       #9: 5mm holes chipping out in melamine ...
Chuck Hicks  Member

Website: http://www.southeasttool.com

Solid Carbide usually does solve the problem, but it is usually because the board in the first place as far as what we have seen.

12/2/14       #10: 5mm holes chipping out in melamine ...
Tim Kulin

Solid carbide did not fix it. We've given up trying to figure it out. We have it solved, but I guess I'll never know what the heck changed. Maddening.

12/6/14       #11: 5mm holes chipping out in melamine ...
Larry

3000 rpm seems really slow! So does the 150 feed. We also use Roucke and it has always been better than most of the others. Carbide tipped running clean holes. Drill box @ 4500.


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