"rangerssuck" wrote in message
...
On Thursday, July 18, 2019 at 7:10:25 AM UTC-4, Jim Wilkins wrote:
"Terry Coombs" wrote in message
...
On 7/17/2019 10:04 PM, Jim Wilkins wrote:
"David Billington" wrote in message
...
On 16/07/2019 05:46, Gunner Asch wrote:
While I love annular cutters for use in the lathe and BP the
3/4"
shank may be a problem for the OPs requirements so a simple
hole
saw
such as a Starrett bi-metal hole saw would be more than
adequate.
Such as
https://www.amazon.com/HSS-BI-METAL-.../dp/B01DO4WNA8
.

Hand-held hole saws up to 4" worked well enough for me when I
was
installing conduit into steel control boxes. Use a slow drill,
like
500 RPM.



My wrists won't take it any more ...

--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !


IIRC the magnetic-base drill wouldn't hold reliably on vertical
painted sheet metal and the hydraulic Greenlee hole punch was even
more heavy and awkward than the D-handled Milwaukee drill and hole
saw.

That was one of the difficult manual metalworking tasks that
prompted
me to buy a milling machine.

Milling machine to make holes in wall-mounted electrical boxes? I'd
love to see that setup.

I progressed to building more sophisticated equipment for less hostile
workplaces; no more wash-downs or oil spray.
https://www.alliedelec.com/m/d/bc893...8d640f9f0d.pdf

Since these electronic enclosures didn't need to be liquid tight I
could make control panels flat and small enough to mill.

I still cut large round holes for fans, and for analog panel meters
when I need their fast response more than accuracy, like on the input
to an MPPT solar controller.