Re: [ATM] Another machining question, please

[Jarvis Krumbein <jkoptic@juno.com>]

HI Richard,

Silver & Demming drill bits are larger bits, usually over 1/2" that have
a 1/2" shank.  They are quite common here in the US and readily
available.  If you do a GOOGLE SEARCH for "Silver & Demming drill bit",
you will get about six pages of listings.  Since most drill presses found
in a small shop rarely have a chuck that will handle sizes larger than
1/2" there is a need for this type drill bit.

On Thu, 15 Feb 2007 23:46:23 +0000 Richard <cnc@cncservo.co.uk> writes:
> Hi Jarvis,
> 
> Thursday, February 15, 2007, 10:49:56 PM, you wrote:
> 
> JK> re drill to the required shoulder
> JK> depth with a 3/4" or 7/8" Silver & Demming drill.
> 
> Not heard of that one Jarvis. I wonder if it is what we call a D 
> bit
> over here?
> 
> Don't know if this has been suggested because my mail server 
> crashed
> earlier and I may have missed some of the thread, but if it's only
> Ally, he could probably get away with an end mill in a half inch 
> chuck
> as long as the workpiece is well clamped. Relies on finding an end
> mill with reduced shaft though.
> 
> A counterbore drill is another possibility, bit expensive at that 
> size
> though.
> 
> -- 
> 
> Best regards,
>   Richard in the UK
> 
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> 
> 
 
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