Guide bushings and reducer bushings
I am looking at a set of each of these on Amazon, a set of guide bushing from Wood river, and a set of reducer bushings from Fulton, or Peachtree, which I think is who supplys them.
Anyway, I had a couple of questions. On the guide bushings, I see some are all about 1/4 inch in depth while others are progressively deeper the larger you get. Is this necessary? The only experience I've had with any are the Milescraft guides for sign making and it only needs to be very shallow. I did buy a whole set of them to fit that baseplate, and they are all varying depths too, but as of yet I have not used any except the shallow one for making signs. I decided I don't much care for the baseplate being so large, or the tight fitting guides either, they're hard to change. Makes me feel like I will break one trying to remove it, so I'd rather have brass and just use the baseplate the router came with. It accepts PC guides. I can see needing deeper guides if you have patterns made from thick material, but 1/4 inch lauan is what I'd use if I made any router patterns. I have made several from lauan plywood but these were all intended just to trace out on thicker wood and then jigsaw it out.
My second question is on clearance. The reducer bushings claim to be only 1/32 larger in opening around the intended bit size, such as a 5/32 reducer on a 1/8 bit. That's only 1/64 clearance from bit to bushing. Can a bit deflect that much and end up hitting the bushing wall? Now I know I can simply use the next size up if it worries me, say a 7/32 on a 1/8 bit. That's still less than 1/16 clearance (3/64) from bushing to cutter edge, which is still plenty close enough, and I don't see the bit deflecting that much. But I just wondered what are the chances of it at all? I have mostly 1/4" shank bits.
Last edited by Duane Bledsoe; 05-14-2015 at 12:35 PM.