Graham Orm
Established Member
Hi Dennis. I sent a follow up email with some afterthoughts in it that covers both these issues, did you get it?
I drew the whole thing in 18mm so that if you didn't have a mixture of thickness's lying around you wouldn't have to buy several different sheets. 12 mm For the base will be fine. I doubt you will find a screw thread who's pitch coincides perfectly with your blade thickness. If one turn takes you beyond the edge of the blade and leaves a tooth behind you can either go back and get it freehand or put a second flat on the wheel so that it stops at the right point mid revolution.
I drew the whole thing in 18mm so that if you didn't have a mixture of thickness's lying around you wouldn't have to buy several different sheets. 12 mm For the base will be fine. I doubt you will find a screw thread who's pitch coincides perfectly with your blade thickness. If one turn takes you beyond the edge of the blade and leaves a tooth behind you can either go back and get it freehand or put a second flat on the wheel so that it stops at the right point mid revolution.