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RE: [OM] lens mounts

Subject: RE: [OM] lens mounts
From: "Brian Swale" <bj@xxxxxxxxxxxxxxx>
Date: Thu, 30 May 2002 17:31:22 +1200
James wrote,

> Brass is a little bit heaver than steel but not much. Brass is much easier
> to machine accurately than stainless steel. The real problem with stainless is
> the tendency to gall, especially in threads. /jnm

Also, stainless steel work-hardens. I.E. rubbing it hardens the surface, so 
that when you are machining it, if the cut is not continuous and clean, the 
surface being cut,  hardens.

For this reason, when using a centre-punch to start a drill-hole in stainless, 
don't use a round centre-punch - if you do you have already hardened the 
hole. Grind a punch to make a triangular (upside-down) pyramid and you will 
find the hole begins a whole lot easier.

Brian




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