Threading Terminology

HMF

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Everything you always wanted to know about threading terminology is in this PDF document.

Enjoy!


Nelson

 

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  • Machine_Practice_and_Phycics.pdf
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Pretty good but some additional info here on drill clearance holes. (If it posts OK?) As a rule of thumb if the base metal is as thick as or thicker than the tap diameter you can drill a larger hole easing pressure on you tap and reducing the likelihood of tap breakage. This chart from my shop teacher gives a few drill diameters with accompanying percentage of clearance. It's a little fuzzy can you enlarge it any other than hold down ctrl and scroll it bigger with your mouse wheel ??
~Chris

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