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Subject:	Re: Thin Veneer Wont Cut
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Message Thread:

Thin Veneer Wont Cut

10/9/24

Nick Cook

Member

Website: http://kootenaicabinets.com

I'm having an issue with MDF 3/4 plywood in which the bottom of the parts, those against the spoil board is leaving about 1/64 of an inch of protrusion. This is even when using a new compression bit and cutting into the spoil board by about .031. Similar to when you don't have the depth of cut correct, and it leaves a skin. This is a much smaller protrusion and the profile bit in question is cutting into the spoil board.
When placing a square on the part it is definitely confirming that the bottom of the part is not being cut to the same dimension as the top of the part.

Run out is within tolerance. The bit is plumb.

Any ideas would be greatly appreciated.

10/10/24 #2: Thin Veneer Wont Cut ...

Tom Gardiner

What is your cutting process? Single pass? What are your feeds and speeds? It is possible that you are dulling the bit with too low of a chipload and that will show as a step in the lower portion of your bit if you are doing multiple passes. You should be above .005" chip for mdf.

10/10/24 #3: Thin Veneer Wont Cut ...

Mike

Hard to tell from your description, but if I had to guess, this protrusion is caused by a conventional onion skin followed by a thru cut. There are two ways to fix this. On the onion skin, leave 0.008" to 0.01" of material larger than the net part size. When you get to the thru cut, cut the part net. The other way is to climb cut.
The reason for this is when you conventional cut, the tool is pulled into the material ever so slightly. Tools do flex. This is called deflection. When you remove the onion skin, there is no force pulling the tool into the part and thats why you end up with a little protrusion. So, if you want to stick with conventional cutting, leave a little stock on the first pass. Net cut and thru on the second. Some cabinet programs won't let you leave a little stock to be left, so you would have to climb cut it. Premill on edgebander will also remove the protrusion.

10/11/24 #4: Thin Veneer Wont Cut ...

MIke

Was that the problem, and did it fix it for you? if not, we need more info.

10/14/24 #5: Thin Veneer Wont Cut ...

Nicholas Cook III

I thought I posted a quick reply. Anyway, yes changing the direction of the cut fixed the problem. Thanks for the information.

11/8/24 #6: Thin Veneer Wont Cut ...

Brooke

Member

Adjusting cutting depth, reducing feed rate, and checking tool selection and machine stability may help resolve the issue of protrusions on the bottom of MDF plywood during cutting.

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