Question about Starrett Jobbers Drill Gage Gauge No. 187 1/16"-1/2
How to use of jobber drill gauge? when need to check?
It is used to check either the size of a drill bit or to see what size fastener you have and decide what size bit to use. Just insert a bit or fastener into a hole. It should fit snugly and if it doesn't fit the next smaller sized hole then you now know what size you have.
Posted on Mar 07, 2012
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Posted on Jan 02, 2017
Tips for a great answer:
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Test fit a drill bit in the lock cylinder. You want a bit that is just
smaller than the cylinder. You will be using hardened drill bits to cut through
the cylinder, since ordinary bits may be damaged by drilling metal.
Lock the drill bit into the drill chuck and tighten the chuck.
production in very fast delivery! special threading taps, plug gauge
Drill a starter groove into the lock cylinder. Start the drill on a low
speed and create a groove in the end of the lock cylinder. You don't need to
create a deep hole, just enough of a groove so that the drill bit will not slip
on a higher speed.
Increase the drill speed to the highest setting and drill out the lock
cylinder. Let the drill do the work. If you force the drill into the lock
cylinder, you could burn out the rotor inside the drill motor
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