[ATM] Making a trepanning biscuit cutter

["Christopher Dalla Piazza" <dalchri@hotmail.com>]

Does anyone have any advice on where to get or how to make a trepanning 
biscuit cutter?

In every text that I've seen there is a picture of a sort of metal tube that 
has ½" triangular pieces taken out of it around its perimeter.

The closest thing that I can think of to buy would be a hole saw for a drill 
at Lowe's but that would have pointy teeth and lots of them.  Would that be 
too aggressive and cause too much stress on the glass?

I've also heard of using a soup can but that sounds a little rickety if not 
painful to the nerves.

The last thing that I could think of would be to use some sort of metal tube 
with an end cap.  Then you would cut the teeth into the tube and attach a 
screw to the end cap for use with a drill press.

A concern of mine with all of these methods is shooting for an exact hole 
diameter.  This will be for a meniscus lens on a Newtonian so it will 
support a secondary holder.  My understanding is that you would design your 
secondary holder diameter according to hole diameter that you can trepan 
because it is easier to machine metal than shave glass.

Any additional ideas?


_______________________________________________
ATM mailing list http://www.atmlist.net/