[modeleng] Re: Question (maybe stupid)

Peter, send on the raspberry then, as that is the only
way I could see doing it(under-sized hole and files),
unless you have a deep purse.  How many holes of this
size and shape do you need to produce?

Al Messer


--- peter.chadwick@xxxxxxxxxxx wrote:

> 
> 
> 
> 
> How do you produce a D shaped hole? Say 3/8 inch
> diameter, with a flat
> about 1/8 of a diameter? (in 16 gauge aluminium)
> 
> first thoughts are punching with a punch made from
> silver steel and
> hardened. What about a die? I presume that when such
> dies are made by
> toolmakers, they first produce a broach and pull it
> through the die
> material, which is subsequently hardened.
> 
> Anyone suggesting a file and a smaller hole will get
> a raspberry blown at
> them. I know that some say the only tools needed are
> a hammer, cold chisel
> and some files, together with skill, but that last
> bit is lacking, and I'm
> too old to get good enough in my lifetime!
> 
> Peter Chadwick
> Swindon
> 
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