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Posted on Best way to flush trim lots of 3/4" plywood?

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builtinbkyn

2999 posts in 1546 days


#1 posted 02-22-2017 02:11 PM

I’m pretty sure I’m not that crazy yet. The OP said “7×7” squares.” “Curvy shapes” never would have elicited my response.

Edit: Ah I see your later post. Thanks for giving me my sanity back LOL

I m looking to cut lots (hundreds) of approximately 7×7” curvy shapes out of 3/4” plywood, and was wondering what the best way is. I was leaning towards making a pattern, trimming pieces on a band saw as close as possible, then using a flush trim bit on a router table.

Was considering the Whiteside compression carbide bit or a narrower carbide bit from MCLS. But any idea how many feet of 3/4” ply these bits can cut before needing sharpening? I already tried a ~$10 MCLS flush trim bit and it dulled after cutting about two pieces. It s only important that one side of the wood is cleanly cut, so using just an upcut bit is possible, but mainly considering the Whiteside bit for its larger size/longevity before sharpening (would that be accurate?).

I thought about hiring out a someone with a CNC, but would rather do this myself. Not needing these all tomorrow or anything but want an efficient method to use in my own shop.

Is this a good route to look into or is there a better method altogether?

- huyz

Sometimes we all don t read the question before answering…

That looks like a monster bit. I have a Freud 1/2 inch trim bit and have used it for years.

I think your approach sounds fine.

A band saw duplicating pin would really help by making the cuts fool proof and reduce the amount needed to be routed. I think the glue in the plywood would be the hardest on the bit, so getting that to a small consistent offset would be best for the bit.

http://www.rakuten.com/prod/bandsaw-duplicating-pin-set-by-peachtree-woodworking-pw1770/227994094.html
EDIT:
Hmmm, Rocker doesn t seem to carry it anymore.

- RobS888


-- Bill, Yo!......in Brooklyn & Steel City :)


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