On Sat, 12 Jun 2004 06:34:03 GMT, "Trevor Wilson"
wrote:


"tony sayer" wrote in message
...
Hole punches for transformers? Like, big square shapes?


No, but nothing to stop you using them for 'starter holes' is there???

Tell you what is useful for odd shaped and even regular shaped holes in
ally is using a router designed for wood use!. I have a cheap trend one
for some 30 quid and some cheap bits for same. There is a very small dia
bit that has lasted very well cutting all manner of shapes in 16 SWG
ally sheet. Even if you waste a few, their quite cheap from the DIY
sheds and do work very well...

**I'd never thought of using a router for aluminium, but, given that I
regularly cut aluminium with my TCT blade compound mitre saw, I guess it
should be OK. I would suggest that some lubricant might be a smart idea
though. Aluminium tends to stick to blades.

Recommended cutting speed for aluminium is 400 feet per minute, with a
feed per cut of .003 inches. Stick somewhere near that, and it
shouldn't smear. A coolant is vital, though.

d
Pearce Consulting
http://www.pearce.uk.com