I have several box joint router templates for ½ - ¾ and 1” joints. I use the ½ with 5/8 collars and spiral down cut bit mostly because less blow out as apposed to straight bits. I was thinking about doing box joint on router table and didn’t want to use 1” straight bit but after looking at the prices of spiral bits, I guess I’ll stick to ½” spiral bits.
Thanks for the inputs.
It's a matter of expense. Spirals are made from carbide rods and it takes a LOT of grinding just to make a normal one with the same cut diameter and shank diameter. Add the extra grinding required to reduce the shank diameter and the cost of the bit shoots even higher. Also, at that diameter there are carbide tipped bits with shear angles that can produce similar results.
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