[sdiy] Metal work

[Oren Leavitt]

Ingo Debus wrote:
> 
> Am 29.07.2009 um 19:39 schrieb Byron G. Jacquot:
> 
>>> Use a "step-drill" for holes in sheet metal. Round holes every time !
>>
>>
>> Up to something like 1.5" in diameter!!
> 
> 
> But only with a drill press, no?
> 
> Ingo

I use the Irwin "Unibit" (USA) with a drill press.
http://www.irwin.com/irwin/consumer/jhtml/brandProducts.jhtml?brand=Unibit

Perfectly round holes in 0.062 - 0.125 inch (1.6 - 3.2mm) thick aluminum 
panels. As an added bonus, the holes are automatically deburred when the 
next "step" just touches the work peice.

- Oren