Originally Posted by
Curt Harms
I've used 3/8" acrylic for sub bases in the past. I wanted the sub base to accommodate Porter Cable style bushings and 1/4" thick material didn't give me much 'meat' to work with. I also counter bored the mounting holes rather than counter sinking them. 3/8" is better here as well, make the hole on the bottom of the base large enough to accommodate the screw head then switch bits and drill the thru hole. I made the thru holes a tiny bit larger than the screw so there is a tiny bit of slop. Center the bit in the bushing then tighten the mounting screws. Will the base move due to the oversized holes? Maybe but I haven't noticed it so far in limited usage.
W/Porter Cable bushings - a little and I mean - a very little - movement would be desired wouldn't it? That way a cone and centering bit could do their job and bring it dead center.
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