Back in the days when I fooled around with model high powered rockets
I had to make bulkheads and tube rings out of plywood, that had to fit
snu nside the body tubes, and I used to have problems when setting the
exact diameter and then tighening it up, it always moved on me. I
replaced the setscrew they used for locking it down, with a cup point
type. The ones they had were just flat on the end. It was much better
in holding an exact size after just changing the setscrew....Also I
found that the cutting tool if its not ground properly has a tendancy
just like a parting tool does, to pull to one side or the other
especialy if there is much of any type of thickness to the material no
matter what it was being cut......thus it would make a smaller or
larger diameter hole even though it would measure dead on what you
wanted.

It took me a long time to figure out it was the way the tool was
ground that made most of my problems.



On Fri, 06 Jan 2006 18:52:20 GMT, "Norm Dresner"
wrote:
I recently had to create a circular hole in a brass plate that was 1.325"
diameter. Since this isn't an even inch or metric size, I used my 30+ year
old General adjustable circle cutter (which, according to the latest Enco
catalog I have is still sold in pretty much exactly the same form as the one
I have).

But I found this tool very difficult to adjust to an "exact" size and
wondered if there was anything out there that would be easier, perhaps
something with a screw-adjustment?

TIA
Norm

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