[python] Svar: for August: stearing headset as pivot

Hey August,
check the "python for Marc" on Dirk's page: 
http://dirkb.dnsalias.net/pythonmarc.html 
He used a steerhead as pivot. I am considering it too. But I guess there are 
pros and conts. The axis has a larger diameter, less weight (?) and would fit 
very well in my design. I am a little concerned about the bearing. From normal 
bikes I well know this phenomenon which we call Autobahnstellung "highway 
position" in german. I guess you know what I mean.
In the position as a pivot, there is certainly even more weight on the bearing.
And honestly, I always had trouble changing the headse once it is worn out. 
'had to use two componant glou as you hardly find the one that fits exactly.

So it is good you bring up the point. I guess Dirk can say something about it. 
I keep reading.:-)

cheers
Thomas

>>> "August" <augusthahn@xxxxxxxxxxxxx> 22-03-2007 17:40 >>>
I will be trying to build a homemade python soon I,m getting some ideas from 
pics  i,v saved some of whice  i have included to explain my plans.I have 
some key points that are absolute:1 all aluminum-2 all bolt together useing 
AN grade hardware-3-16"or 20" wheels.Zero or very minimum welding required 
maybe just the headtupe ? does anyone know anyone who has used a streering 
headset for the pivot?
----- Original Message ----- 
From: "Jürgen Mages" <jmages@xxxxxx>
To: <python@xxxxxxxxxxxxx>
Sent: Thursday, March 22, 2007 3:59 AM
Subject: [python] Re: Self Centering vs. Wheel Flop


> Hej Dirk,
>
>> In the model it could be better to do the rear part not as trike
>> wheels but instead to fix to the ground over a joint (scharnier)
>> located where normally the rear wheel hub is. That way the bike would
>> not hop around like a mad bull, though the arena scenery is quite
>> fitting for that.
>
> I will make a new model including yours and Stephan's ideas. Sounds
> good.
>
> BTW through the model I realised that it is not the weight of the whole
> front part that favors the wheel flop, but only the weight of the part
> that is NOT rising when the wheel turns. Roughly this is everything in
> front of the line [axle - contact patch].
>
>> I have downloaded the SDK for newton, as it should be possible to
>> feed the model programmatically and to extract graph material from
>> that. But I am not sure how much I will be able to play with it. At
>> the moment I am very busy with my job. :-(
>
> There is also ODE (Open Dynamics Engine) which is an open source
> physics engine, but I have no experience with that. I also tried
> the Newton SDK, but gave up due to lack of time and C++ skills.
>
> Groetjes,
> Jürgen.
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