Found Collection

> I tried making a centering ring with a rotozip.  It basically didn't work.
> It takes enough pressure to move the rotozip through hard plywood, that the
> plastic mounting plate flexes.  The tool seems to be made more for rough
> cuts in wood or particularly drywall.  It isn't rigid enough to cut out
> precise circles using it as-is.  I think the only way it would work would be
> to build a fixed rigid base/holder for the tool, and make a pin for the ring
> that can be moved relative to the bit, and rotate the ring on the pin while
> holding the tool stationary.

> > I tried making a centering ring with a rotozip.  It basically didn't
work.
> > It takes enough pressure to move the rotozip through hard plywood, that
the
> > plastic mounting plate flexes.  The tool seems to be made more for rough
> > cuts in wood or particularly drywall.  It isn't rigid enough to cut out
> > precise circles using it as-is.  I think the only way it would work
would be
> > to build a fixed rigid base/holder for the tool, and make a pin for the
ring
> > that can be moved relative to the bit, and rotate the ring on the pin
while
> > holding the tool stationary.

> I've found that a Rotozip RZ125 bit (one of the serrated ones, rather than
> the "spiral saw" style) works quite well freehand in a Makita die grinder
> (a Dremel tool's big brother) for fairly precise rough carving of G10 and
> plywood. It also makes cutting out windows in phenolic coupler tubing for
> slip-in electronics carriers really quick and easy.

> (Bob K., if you want to note this for your "Astron Workshop" list, the
tool
> was a model GE0600 die grinder - IIRC it comes with a 1/4" collet; there
is
> a 1/8" collet available which fits the RZ125 bit (and most standard Dremel
> accessories). I had to special-order the collet... it took some
persistence
> (the salesman had trouble finding it in the accessories catalog); I simply
> _refused_ to believe that the item didn't exist!)

> -dave w

> I'm glad that some of you can free-hand a circle!  I can't.

>>Someone came up with a great design for a centering cutter using a rotozip
>>or router mounted under a table.  Who was that, and can you send me the link
>>to the site where you had the pics?

>That was me.  I don't have a web site but I can mail you the pix or post them to
>a.b.m.r.