[python] Re: Questions from a total newbie

Hello List

At 09:00 PM 3/21/06 +0100, you wrote:
>snip<
>> Well, what I had in mind is a bike where the seat height is constant, 
>> only the angle of the main pivot would change. This would involve 
>> mounting each half of the pivot bracket (front and rear) on a horizontal 
>> pin and controlling their angles together with regard to their 
>> respective halves of the frame with set screws, so that the bike's 
>> overall geometry wouldn't change. Being my first Python, on one hand 
>> you're right, I should keep it simple, but on the other hand, if I 
>> implemented something like that (if it's doable at all), I would have 
>> room to experiment with the pivot angle without having to make another 
>> frame each time.
>
>I see. Something like the adjustable rod end bearings solution of
>Mike and Tim.
>

I think that an adjustable pivot angle might best be addressed by a virtual
pivot python.  I've been thinking of building one.  The front and rear parts
would be connected with links, each link with a rod end bearing at each end.
Each pair  of links would angle inwards towards the front of the bike. One
pair would be positioned above the other pair a few centimeters.  Each pair
of links establishes a point on the virtual pivot.  Changing the angle of
the links would change the location of the virtual pivot.  I haven't yet
figured out how to make the mount on the frame adjustible so that the angle
of the links could be varied. The ultimate would be to incorporate some sort
of a threaded rod, so that by turning the rod the mounting points would move
closer together or farther apart.  Clearly a drawing is needed...but I don't
know CAD..

Another benefit of this approach would be the ability to vary both pivot
angle and trail independantly on the same bike.  

Regards,

Mike Channon
London, Ontario, Canada

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