if you don't mind ruining the bit and the bushing???
I'm cutting 3/4" holes using a template with 1" holes. So, the OD of the guide bushing would be 1".How well can you center the guide? Can you somehow have the bit protruding out of the guide so only the shaft is within it?
Out of curiosity what is the OD of the template guide?
I knew you would figure it out. That is what I was going to suggest.Found a 1 1/4 OD PC bushing that will work. Just need to make the template holes bigger.
The bigger OD is no problem but, I just got lucky finding it. Only Klingspor had one of all the sellers I found.I knew you would figure it out. That is what I was going to suggest.
Thanks, Theo. That would have been the next thing to try if I hadn't found the bigger one. It's 1 1/32 ID. Just needed it to be big enough to spin a 3/4 bit safely. Not following a pattern so, OD isn't critical.Electric drill, piece of dowel, and emery cloth, should enlarge the hole easily enough.
Not only can you NOT see what the bit is doing but the likelihood is that the dust will build up and cause lots of heat, not good for the bit! Two reasons why I design most of my templates to use a 40mm template guide. This shot illustrates what I mean....to spin a 3/4" straight bit in a PC template guide with a 25/32" ID?
Forstner bit...?Thanks, Harry. I'm just cutting bench dog holes. The reason for the template guide is to be able to use a template that assures accurate spacing.