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Old 08-18-2019, 5:57pm   #23
Sparkles Flambeaux
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Originally Posted by JRD77VET View Post
That's why the US standardized threads in 1920. The #30 thread is .300 in diameter.

There was no rhyme or reason to manufacturer thread sizing so you were forced to purchase replacement parts only from them. Now if you want to produce an oddball thread size, you specify diameter and thread pitch.
ah ha!

long ago, we took a tour of one of the old DuPont mansions in Delaware. near the front of the property was the old garage, and it still had several old machine tools (including an old lathe i recall). i noted to the guide, that there were not Pep Boys shops back then, so if the car broke down (only the rich originally owned cars), you'd have your mechanic make a new part. thus the tooling on property.

same thing with your old machines. busted bolt? grab some bar stock and make a new one. heat treat? surely you jest!
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