"Jon Anderson" wrote in message
...
On 4/06/2016 9:44 PM, Jim Wilkins wrote:

Have you considered Greenlee punches?

Good tools, I have a few. But would only work in a few instances.

I've used one of these at a later job.
http://www.roperwhitney.com/bench-deep-throat.html

This is more what I want for the shop, but not having much luck
finding
something equivalent down here. Have only found a couple models so
far, not up to the Roper Whitney level.

I have the XX model hand punch, nice unit.

I was just trying to figure out what aspect of drill geometry
contributed to lobing and reduce it if I could, just because.
Our work is pretty crude by the standards of most here. Need a hole
for a 10mm bolt, just drill 10.5 or 11mm, nobody worries about nice
round holes... Hole making is 95% 304SS in material thicknesses from
1 to 40mm. Holes in thin material are only part of it. Appreciate
the time to respond and offer the suggestions.

Jon

You could start holes with a center drill, perhaps in a conveniently
small battery powered drill. They make a nice round starting hole, but
they can be difficult to sharpen and a clumsy user may break off the
tip.
http://www.tapdie.com/html/centre_dr...tre_drill.html

--jsw