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Subject:	Re: burn parts
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Message Thread:

burn parts

3/4/25

Ivan

Member

We are cutting this and burn part happen. what could be issues? appreciate the help.

FEED RATE: 24000 MIN/MIN

SPINDLE : 24000

DIAMETER: 10MM ROUGH

PLYWOOD THICKNESS: 19MM

NO OF WING: 2

VERTICAL PASS: 1

View higher quality, full size image (1178 X 578)

3/5/25 #3: burn parts ...

jerry

Member

Spindle is way to high try about 10,000 rpm then start going up 12,000 should be in range

3/5/25 #4: burn parts ...

andy

Member

RPM and feed are both too high for a 10mm cutter. I would say RPM around 14k to 18k and feed try 18mpm. But a question about the plywood. Is that fire retardant plywood? If so, the chemicals in it make it very difficult to work with.
I would talk to your tool supplier and see what they recommend. I think a serrated edge would hold up in this case.

3/5/25 #5: burn parts ...

Mike

I don't really put to much thought in it, but when I cut 3/4" russian birch, I use a 3/8" diameter 3 flute mortise compression bit. Speed is 18k feed is 1000ipm. I guess that is around 25M. That gives me a 0.018" chip load. That always gives me a nice core and good finish on top and bottom of the panel. If you stay with a 2 flute tool, keep the speed at 18k and drop to 17M feed rate for about the same chip load.

3/5/25 #6: burn parts ...

Ivan

Member

Thank you, everyone! I really appreciate all your input.

I recently joined this team, and they�ve been handling all the machine settings. They mentioned that the router bits were only burning recently, but they�ve had frequent issues with bits breaking in the past. I suspect the feed rate might be too high, so I�ll try adjusting it and fine-tuning the settings to see if it makes a difference.

Thanks again for all the great insights�I truly appreciate it!

3/5/25 #7: burn parts ...

jerry

Member

I don't think your feed rate is to slow but the spindle is way to fast

3/6/25 #8: burn parts ...

Dropout

Member

The feed rate is pretty close to zero when machining that spot. I can't tell from the pic but we always use a radius that is larger than the bit so the feed doesn't ever stop.

And like other said, drop the RPM. Too high feed rate doesn't burn, too low feed rate does and too high spindle speed does.

3/14/25 #10: burn parts ...

Tom

Member

that's a lot of work for a small cutter. cutting ply in one hit at that speed you wont get a good finish and the tool is not going to last very long at all.

try; 21000 RPM, 18m/m Feed, 6mm passes, use a compression spiral cutter if available to reduce the breakout on the top and bottom edges

plunging into the material at a slow feed rate can cause burning too so check your lead in feed rates

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