Explain drill sizes to me - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 26 Old 03-03-2010, 10:29 AM
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matched set

If you look in the tool section at HD, they sell individual taps with an appropriate size drill bit included with it. The tap and bit are on a cardboard card sealed in plastic and they are good for the average non machinist who needs to tap an occasional hole.
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post #22 of 26 Old 03-04-2010, 12:09 AM
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Or in the case of cast iron rough drill the holes the day BEFORE you tap them so the CI will recover from the heat of being drilled :}:}:}:}, then drill to finish size and tap

WE do not want to go to what is needed with Stainless Steel LOL LOL LOL
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post #23 of 26 Old 03-04-2010, 03:00 AM
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Most people walk into a store and think, "its just a screw." Little do they how much goes into not just the engineering, but the manufacturing and calibration of the threads.
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post #24 of 26 Old 03-06-2010, 05:08 PM
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Quote:
Originally Posted by cheese9988 View Post
Most people walk into a store and think, "its just a screw." Little do they how much goes into not just the engineering, but the manufacturing and calibration of the threads.
And that's a good thing because most of us don't have any need to know. For 99.99% of what I do, the nearest fractional drill to the specified numbered drill bit will work just fine. If the strength of the connection is only 75% of the optimum, that's fine and I don't care because, after all, I'm not building a space ship.

Jim
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post #25 of 26 Old 03-06-2010, 11:03 PM
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Quote:
Originally Posted by cheese9988 View Post
Most people walk into a store and think, "its just a screw." Little do they how much goes into not just the engineering, but the manufacturing and calibration of the threads.
Itgets better when you think about it...

How did the machinist cut the very first thread?

Use the right tool for the job.

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post #26 of 26 Old 03-07-2010, 08:29 PM
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I keep a supply of drill bits in two sizes, too big and too small.

Spilling wine on oak does not make it purpleheart!
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