45 degree miter on square columns
I have built square columns before and I like using #20 bicuits for my assembly. I'll set up my machine to cut a bisuit hole about 1/8" from the inside edge of the miter. There's enough clearance so you wont be coming out the other side. And I would put them, the most, 12" apart, most likely 8" depend on the size of what I'm building. I've done this myself and wished I had help. Clamping can get complicated. A slower drying glue helps alot also. But its a one shot deal and will be finished and ready to work on in the morning.