Author Topic: What is special about these  (Read 1622 times)

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Offline john k

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What is special about these
« on: April 08, 2014, 08:44:16 PM »
yes,  drill bits, or (drills) if you go by the old catalogs.   There is a special use for these.    What is it?  Let the wild guesses run for a bit before the truth sayers have their say.
« Last Edit: April 08, 2014, 08:45:53 PM by john k »
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Offline oldtools

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Re: What is special about these
« Reply #1 on: April 08, 2014, 09:00:37 PM »
Looks like my Silver & Deming drills for metal, with cut down shaft for 1/2" or 3/8" drill chuck
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Offline leg17

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Re: What is special about these
« Reply #2 on: April 08, 2014, 09:06:44 PM »
Box looks like recent cheap Asian imports.

Offline john k

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Re: What is special about these
« Reply #3 on: April 08, 2014, 10:08:16 PM »
These all are half inch shanks, with a flat ground on one side, to use in the old post drills.   Those that use a set screw to hold the drill bit.    They are an asian import, but over 30 years old, and cut steel just fine. 
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Offline scottg

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Re: What is special about these
« Reply #4 on: April 08, 2014, 11:19:34 PM »
 Never saw post drill bits this new. They must have been using them in remote parts of the world maybe?

   The early post drill bits are straight flute, not twisted.
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Offline RWalters

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Re: What is special about these
« Reply #5 on: April 10, 2014, 07:52:28 AM »
Half inch shanks with a flat will fit a Cole drill as well.