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ftl
09-10-2010, 09:57 PM
I've always wondered about what Silver & Demming means.

Does S&D mean anything other than the fact that they always seem to be 1/2" and larger and have a reduced 1/2" shank? If there is nothing else special about them, why would they not just be called reduced shank bits?

Does anybody know the answer? Google searches just seem to come up with hundreds of sets of bits for sale.

Mcgyver
09-10-2010, 10:09 PM
orginally a brand name i believe, they've come to mean (larger) drill bits with a turned down, cylindrical shank that are of a size where a standard drill bit would have a taper shank

rustamd
09-10-2010, 10:11 PM
One particular type of reduced-shank drill bits are Silver & Deming (S&D) bits, which have a 1/2" reduced shank, and are 6" long with a 3" flute length which are designed for slow-speed (350rpm or less) large-scale boring.

http://en.wikipedia.org/wiki/Drill_bit_shank

J. R. Williams
09-10-2010, 10:37 PM
Silver and Demming is the brand name of a company that produced the familiar short length drills with the cut down shank. The name has been commonly used for that style of drills and is similar to people calling and adjustable wrench a "Cresent" wrench.

JRW

J Tiers
09-10-2010, 11:01 PM
And they fit one of these, which the company, or part of it, also made a version of, IIRC

http://img.photobucket.com/albums/0803/jstanley/CBFD_post.jpg

JoeLee
09-10-2010, 11:07 PM
I believe that Silver and Demming were two blacksmiths back in the 1800's who developed that large type drill bit. Back then holes were punched out in steel that was heated red hot. Somehow the name stuck.

JL...............

Hogridnfool
09-11-2010, 12:52 AM
Here is the history of Silver & Demming Manufacturing...http://www.owwm.com/mfgindex/detail.aspx?id=1017

andywander
02-24-2013, 10:06 PM
There is only one "m" in "Deming".

LKeithR
02-24-2013, 10:30 PM
Silver and Deming has simply become a generic term for that style of drill bit. Up here in the Great White North we generally call them "Prentiss" drills. Means the same thing...

jmarkwolf
02-25-2013, 04:21 PM
I've often wondered aloud why Silver >> OR << Deming couldn't have come up with idea. :confused:

sasquatch
02-25-2013, 06:13 PM
Interesting, i too often wondered about this but never tried to research it.

loose nut
02-25-2013, 07:12 PM
S & D drill go back to the time before drill chucks were to be had.

You either used a taper shank, like a Morse or collets. The S & D drills could be used with out always having to change the collet.

marinusdees
02-26-2013, 01:51 AM
Thanks for pointing that out. I often wonder how gents who profess to machine to a "thou" can't spell correctly.

Joel
02-26-2013, 03:15 AM
Thanks for pointing that out. I often wonder how gents who profess to machine to a "thou" can't spell correctly.

??
Because one has extraordinarily little to do with the other. I will refrain from comment regarding sentence structure.

Astronowanabe
02-26-2013, 05:27 AM
Thanks for pointing that out. I often wonder how gents who profess to machine to a "thou" can't spell correctly.

... can't spell fashionably.

there I fixed that for you.