This appears to be a great hole layout method Kevin.. thanks for mentioning
it.

But, the HSM tool should involve a linear bearing on precision ground shaft
(scrounged from a free/curbside printer) to attach an old, derusted set of
dividers to (with tig or silver solder).

Replaceable carbide scriber tip optional.

WB
..........
metalworking projects
www.kwagmire.com/metal_proj.html


"axolotl" wrote in message ...
nick hull wrote:

I likely will wind up doing some variant on that method, there is a lot
to be said for simple and cheap.

The simple way of marking the entrance/exit of a large hole, as done in
boatbuilding:

Drill a 1/4" hole in the center of the eventual hole in the workpiece at
the desired angle.
Affix a 1/4" dowel to one leg of a compass (the ones that let you clamp a
pencil in one leg make this easy).
Set the compass for the radius of the large hole.
Slide the 1/4" dowel/compass leg into the hole.
The other compass leg will draw the outline of the large hole.
Repeat on other side of workpeice.

Kevin Gallimore