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BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

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BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

Howdy,

 

Anyone know how to model these threads (female/hole) in CREO 2.0?

 

Please and Thanks,

Frank

1 ACCEPTED SOLUTION

Accepted Solutions

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

If you want to model the threads, right here:

Yet another Thread thread - UTS Implementation

9 REPLIES 9

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

Are you looking to actually cut threads into the material?

A simple way would be to give the hole properties and the thread call outs.

Welcome to the forum.

Dale

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

If you want to model the threads, right here:

Yet another Thread thread - UTS Implementation

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

Welcome to the forum, Frank. That's a bottom bracket, BTW.

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

The bottom bracket is part of the frame. Since a huge number of people have misapplied the term to the crank spindle assembly, aka bottom bracket bearing, the term is now damaged and the bottom bracket portion of the frame has to be called the bottom bracket shell for clarity.

A great reference for all things bicycle - http://www.sheldonbrown.com

Highlighted

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

Looks like the thread is actually a British Standard Cycle Thread (BSC)....slightly different than UTS, UN, etc...but apparently ISO compatible.

http://mdmetric.com/tech/thddat17.htm

Anyway, for migrane fun, I modeled the threads using VSS....my favorite since helical sweeps are sooooo ProE v1...and no fun . See attached. Bottom bracket (or whatever it's called) dimensions are a guess, but the thread should be correct.

bottom_bracket.jpgbottom_bracket2.jpg

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

I think Bottom Bracket has become the "region of the crank arms" with further clarification for each element...

http://en.wikipedia.org/wiki/Bottom_bracket

And the world lost a great resource when Sheldon passed... RIP!

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

Damn eric... now I'm going to have to come up with even more thread sections

Okay... how ya going to thread that into anything with both left and right and threads

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

LIke I trust Wikipedia over Sheldon for bicycle terms.

Re: BC 1.37 x 24T (Bicycle pedal hub threads/right & left hand)

Heat the frame and cool these parts, slide them in and let them return to normal temps. For sure it's not going to loosen. Be sure to use lubed-for-life bearings.

The OP was looking for the hole/internal thread. I think he needs to buy the taps, find a bike shop that will cut the thread, or just give the assembly to a machinist to single-point the mating part. http://www.parktool.com/blog/repair-help/bottom-bracket-tapping-and-facing-bts-bfs

In looking for terminology references I came across Campy using hirth couplings. For anyone but Campy I'd ask why, but if it's expensive and precise, Campy is the company to try it. They also made a wine bottle opener.

While many people concentrate on replacing the efficient chain drive on bicycles as some sort of design improvment, it is amazing to me the variety of ways developed to attach the pedals to cranks and cranks to the chainwheel and frame.