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box joints

Postby greengrass » Mon Jul 27, 2020 10:59 pm

I have made a box joint jig for my router table and it seems ok except 'Tear out'. Cutting slots when i pull jig back ready for each cut I get tear out of surface layer of the ply (1/2" ply with 3/8" straight router bit. Cutting the
last slot of 5 caused loss complete of the pin next to it.
Tried some scrap 1.5 x 1/4" pine batten and that was splinter tear(hanging on) both sides. Would post pic but can't seem to resize. It's a new cutter from set of four were cheap, or is it wrong type of straight cutter
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Gorilla Glue heavy duty grab adhesive

Postby stoneyboy » Tue Jul 28, 2020 10:37 pm

Hi greengrass
My best guess is that your cutters are blunt even though they are new.
You should be using wc tipped straight flute cutters.
Regards S
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