Baltic Birch destroys bits?

[BoucherPK]

First time post, long time lurker.
Im using a 3/8 Solid Carbide Chipbreaker Finisher Compression from onsrud attempting to cut 3/4" 5'x5' BB. I set my stepover and stepdown to 1/4", running 18000rpm and have been testing between 18000-19000mm/min (710-750IPM). I build speaker boxes so there is a large amount of detail and interior dados as well as TONS of cutting per sheet. My bits are still getting hot and mildly burring the top edges of the wood.
Suggestions to make my life easier?

[lgalla]

boucherpk.
What brand of router do you have?We run a Thermwood with 10HP spindle.
We cut 18mm birch one pass with 1/4"2flute straight bit.450ipm is the top speed we can use.750ipm is high.With the burning I would be worried about a fire in the dust collector.
What part of Canada are you from?
Larry

[BoucherPK]

Im running a AXYZ 4010 60"x120". With the 1/4" straight 2 flute how does does the top edge of the wood look? I run into chips along the edge of my cuts and dados even though the bit I use is supposed to be a "chip breaker". I have played around with depths and feed rates but it seems like no matter what I do my bit is still hot to the touch once its done cutting. This kills the life on my bits.
Im in Calgary, building speaker cabinets.

[ger21]

I'd try 3/8" deep and 15 or 16,000 rpm.

If you have an ATC, I'd try using a roughing bit making one pass, and using the compression to clean up maybe .01 or so. Roughing bits can burn through plywood like it's butter, and the life of your compression bit will go up by a factor of 10 or more. You'll end up making 2 passes instead of 3, so it should be faster. You can probably increase your feedrate, too.

[ger21]

A chip breaker bit isn't to give cleaner edges, it's to break the chips into smaller pieces, which lowers the cutting forces.

Try the roughing bit like I said.

[lgalla]

I would try what Gerry says.Chipping sometimes appears to be caused by the top veneer not being glued very well.At our cutting speed we do not get a perfect edge.A quick pass with sand paper is all we need.
I build cabinets in TO.
Larry

[ger21]

I've cut 1" plywood with these in one pass no problem.

Vortex Tool: Two Flute Upcut Roughing Tool - Series 1000

[louieatienza]

First time post, long time lurker.
Im using a 3/8 Solid Carbide Chipbreaker Finisher Compression from onsrud attempting to cut 3/4" 5'x5' BB. I set my stepover and stepdown to 1/4", running 18000rpm and have been testing between 18000-19000mm/min (710-750IPM). I build speaker boxes so there is a large amount of detail and interior dados as well as TONS of cutting per sheet. My bits are still getting hot and mildly burring the top edges of the wood.
Suggestions to make my life easier?

How many flutes is your bit? If you're using a 3-flute bit you might have to switch to 2, and if 2 you might have to switch to single-flute...

[BoucherPK]

Im using a 2 flute. Getting better results, but still too much heat transfer to my bit and spindle. I should be able to touch my bit after and not have it be searing hot, correct? Or is that ridiculous?
Thanks for the help.
Igalla, is that a horn loaded sub? 12" drivers? Im about to start our first prototype of something surprisingly close. I just finished a run of 22 of our self powered front loaded dual 18's.
PK Event Services | Touring | Sound - Homepage

[MillworkMike]

Cut your feedrate in half and Set you toolpaths to run counter clockwise when cutting veneer core....... you will get a much better cut!!

[BoucherPK]

Is 13ply, 18mm (3/4") baltic birch considered a hard plywood, veneer core or a HDP(high density plywood)?
Trying to figure out exactly what kind of bit I should be purchasing from my supplier to maximize tool life.

[ger21]

Tell your supplier what your cutting, and they'll tell you what they call it.

But I still say the roughing bit will give you the best tool life.