[sdiy] DB25 hole

[Paul Cunningham]

Did anyone mention using a stepped drill bit? This is really helpful to keep your drilling clean without distorting the aluminum around the hole and/or catching on the initial penetration. A punch is ideal, but not very cost effective unless you are making lots of holes the same size. -pc

On Mar 5, 2011, at 8:12 AM, "Mike Pepper" <profpep at hotmail.com> wrote:

> 
>> Anyone made a DB25 shaped hole in a cast aluminum box?  Favorite methods
>> or tools?
>> 
>