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Re: possible worm gear

 

开云体育

Two sizes for pedal threads.? One for kids bikes, one for adults.? Imperial threads, of course, and the difference between them is bugger all (1/16”) so I’m not entirely sure what the point was.

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And I think the smaller size is only for small kids bikes with those one piece cranks.

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But that’s bicycles for ya, make everything different because why not.? Changing handlebar tubes from ~25mm to ~30mm still annoys me, ??Why?

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Tony

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From: [email protected] <[email protected]> On Behalf Of Chris Albertson
Sent: Tuesday, 26 March 2024 11:18 AM
To: [email protected]
Subject: Re: [7x12MiniLathe] possible worm gear

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At least today the pedels all use the same thread. ? But so much else is totally custom. ?Like the tapered-head titanium cap screws. ? One newish innovation is that all the screws on my bike are marked with a “Min and Max torque” value. Something like “5 - 7 newton meters” by every screw. ? ?I think this happened when they went with carbon fiber.

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I have NEVER heard of anyone usimng machine tools to work on a bicycle. ? It is just not done.

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On Mar 25, 2024, at 3:04?PM, mike allen <animal@...> wrote:

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Back when I was still into bikes & Campagnolo ruled everyone had to use different threads in their bottom brackets & pedals . I had/have a Set of TA cranks & chain wheels & the threads were different between? TA , to Stronglite , &? Campy crank sets . I was so pissed when my new to me Campy blacktop pedals wouldn't fit the cranks . It's actually probably good that I didn't have a mini lathe or any lathe & mill for that mater back then. I'm sure I would have ruined a lot of expensive parts by fixing them .

animal

On 3/25/24 2:05 PM, Chris Albertson wrote:

The thing about bicycle parts is that they use a lot of non-common threads and gear profiles and screws with custom head shapes, not to mention exotic metals and tempering. ? for example, you can look at a standard bottom bracket and find?34.92mm diameter threads. ?Not a hardware store size. ?You might measure and?think “35mm” and be wrong. ??

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I don't know the specs on the gear you need but, there is a good chance is it a custom-size or profile.

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On Mar 25, 2024, at 1:34?PM, davesmith1800 <davesmith1@...> wrote:

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Yes a photo helps

Dave?

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