box joints Kitchens, doors, rails, stud, tables, chairs, stair cases, garden furniture etc... Find answers and ask questions here!

[greengrass]

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

[stoneyboy]

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