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What simple machine makes a drill?
The twist drill uses flutes that act as an Archimedean screw to lift swarf from the hole.
What is the difference between drilling a hole using a pedestal drill compared to drilling on a metal turning lathe?
On a pedestal drill the workpiece is static and the drill is in a vertical position and rotates. On a lathe the workpiece rotates but not the drill, and the drill is in a horizontal position.
What size drill bit should you use for a hole to be tapped for a .25 x 20 screw?
I use a 3/16 drill bit for that.
How long to drill a oil well?
it depend on the ground level and the kind of hole it is..
Could the reversable drill bit extract a broken bolt?
Not unless it was reasonably loose. Usually when faced with this, I drill into the bolt with a very hard drill bit a tiny bit thinner than the bolt - ie if it's a 3/8 bolt, I drill in first with a 1/8 drill to create a guide hole, then after with a 5/16 drill to cut right through, yet not harm the threads. You have to be very careful to stick to an exactly straight course. After the hole is cleared, I pull the threads left from the bolt out as far as I can, then use a 'clearance' tap of bolt size to re-tap the hole.
