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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #21  
Old 9th December 2019
Scott Scott is offline
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Quote:
Originally Posted by JonesL View Post
Yoshi, Whitworth is the one with rounded thread shapes, not a sharp "V".
If you want to get into other 'interesting' threads there's also Acme, 29 deg. And a fun one I have to cut occasionally, Buttress thread.

As I've been told the story; Harley Davidson also had their own proprietary thread pitches in the teens. After the war department bought a bunch of Harleys for use during WW1 and found out that only Harley nuts and bolts would fit Harleys, Messrs. Harley and Davidson were told 'straighten up and fly right'. Something along the lines of 'Standardize or we aren't buying anymore Harleys' that brought H-D into the mainstream.
Harley still hadn't "straightened up" by WWII, as evidenced by the number of 1/4"-24 fasteners on my old 45 flatty.
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  #22  
Old 9th December 2019
JonesL JonesL is offline
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Nah... Probably just NOS leftovers they wanted to use up before reordering.
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  #23  
Old 10th December 2019
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JonesL acme threads are the ones I see used on c clamps with the flat threads?
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  #24  
Old 11th December 2019
JonesL JonesL is offline
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Yep, you're right, brucstoudt. Acme is preferred when you want a thread that's robust and won't get clogged with dirt and stuff. Unlike a "V" thread, because of the Acme thread profile, it's pretty hard to ding 'em up so bad they won't work.

Another odd one I cut is a "buttress" thread. They're usually seen on old screw jacks and the breech plugs of LARGE breech loading cannons. The 90 deg. face is the load bearing side and the 45 deg. face acts like a gusset or shelf bracket.
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