Re: [neonixie-l] Re: Where to get cool clock housings?

[Instrument Resources of America]

Or use the Greenlee hole punches, a bi-metal hole saw of the correct 
size, or a fly cutter used in a 'drill press'. CAUTION!!! Do not use a 
fly cutter in anything but a 'drill press'.  Greenlee hole punches can 
be found on Ebay up to over four inches in diameter, and as small as 
3/8".  The Greenlee hole punches come in two distinctly different sizes. 
One size is done in "conduit sizes" for 'electricians' in which case the 
hole that is made is not a true size. In other words a punch labeled 1/2 
CONDUIT does not punch a half inch hole, it's actually somewhat larger. 
The other sizes are true and exact sizes. One will be labeled CONDUIT 
the other is labeled DIAMETER.   If you are creative you can use the 
above to make oblong or oval holes for the side view or oval shaped 
nixies.       Good luck,Ira.

On 1/30/2011 5:58 PM, Charles MacDonald wrote:
On 11-01-30 02:44 AM, threeneurons wrote:
You can take this opportunity to learn a new skill set. The metal
casings need not be CNC, though many probably are. Many electronics
hobbyist use to make their own chassis, or at least punch the holes in
pre-made rectangular boxes. And they did it quite cleanly. Aluminum is
a relatively soft metal. With an electric hand drill, maybe a jig saw
(metal bits), a sturdy vise, and a set of files, you can do some
pretty good work, given a little practice.

The common tool used to punch a chassis is a "chassis Punch" sometimes 
called a "Greeenlee" punch after the major manufacturer.

Two parts joined by a big bolt.  As you tighten the bolt the Cutter is 
drawn into the Die and makes a clean cut.  They even exist in versions 
to make rectangular holes.


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