[python] Re: splitable pivot
- From: Ray Schümacher <mtb@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Wed, 02 Mar 2005 09:00:28 -0800
At 11:13 AM 3/2/2005 +0100, you wrote:
>Won´t you get ground clearance problems by using a BB
>instead of an industrial tapered roller bearing?
How about a bronze bushing with a hard clevis pin? And the pin does not need to
be supported at both ends. Think of a trailer hitch with a pin and clevis
rather than a ball, and the pin pointing downwards. A bushing does not need end
load for this pivot like bearings, since most all load is down from the rider's
weight a clevis, spring washer and washer would be all that is needed.
How important is the ~zero friction of the usual bearings when riding? I find
very low speed maneuvering requires fairly quick response, but I would guess
that like an upright, at any significant speed it is actually desirable to have
friction. You can also modify bushing properties by grease selection more than
rollers.
>I think, it will be rather difficult to tap a hardened BB axle.
>If you could manage this, the idea is nice.
I have found that a little orange heat right at the end of a shaft will remove
the hardness enough for tapping, if you let it cool slowly.
For disassembly, one could also have the rear frame detach behind the pivot,
with a telescoping tube.
Ray
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