[python] Re: Geared Steering
- From: Logan Streondj <weyounet@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sat, 1 Jun 2013 21:30:47 -0400
George, I'm not sure how the bell crank and link rods would work,
since they change the direction of a straight line of motion,
whereas here we need to change direction of a turning motion,
so bevel gears seems more appropriate.
If you do know how it'll work, perhaps you could make a picture of the
concept.
The rubber pivot idea is curious, though I don't know how to implement it,
if there was some kind of tutorial or at least pictures/videos of it in
action would make more sense.
Gerald, yes so the legs can help with steering,
by changing angle between stern boom and forward wheel,
So I'm wondering if perhaps can use clipless pedals on forward wheel,
and handle-bars on stern boom, to allow steering while going downhill,
or when using electrical assist without pedalling.
An alternative to clipless pedals, maybe a spot where can hold the front
wheel with feet, perhaps by squeezing it between feet.
That would certainly be an easier solution, than having gears,
and may achieve similar results.
On Sat, Jun 1, 2013 at 3:56 AM, Gerald <bepb@xxxxxx> wrote:
> **
> Hi Logan,
> there is certainly Jürgens orginal construction page:
> http://www.python-lowracer.de/construction.html
> Also, there is some info on the Python WIKI:
> http://en.openbike.org/wiki/Main_Page.
>
> Concerning the lever system, I think you will face the same issue as with
> the handlebars. If you want to steer with the levers, you have to
> counteract the forces extended by your legs.
> I like to point out, that with some practice, the legs only steering
> becomes very comfortable.
>
> BR
> Gerald
>
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> On 30.5.13 17:28 , Logan Streondj wrote:
>
> hmmm, I don't think a damper would really do the trick.
>
> So guess the gears and levers is worth attempting, would probably cost
> 15-30 for the gears, and some more for the levers, though can probably just
> use some bike frame parts.
> only thing gotta figure out now is some kind of pivot for the side
> gears, though guess it could just be some kinda short pipe that flares out
> or has a cotter pin at the end,
> that may interfere with the lever placement, though guess the "green"
> housing can simply be around that part so it should work.
>
> I'm hoping to get a chance to build a python this summer, can probably
> use my parents backyard, since my apartment doesn't have anywhere to do
> welding.
>
> Is there a listing of python building tutorials somewhere? I like to read
> up on as much information as I can usually before doing something.
>
>
>
> On Wed, May 29, 2013 at 2:28 AM, Steffen Risse <big.skangster@xxxxxxxxx>wrote:
>
>> Pay attention that you don't understand me wrong please. if you lock the
>> pivot on a bike it's sure that you'll fall over. On a trike it's less a
>> problem. The thing is just to dampen fast big movements especially at high
>> speeds. A possible solution comes from the motorbikes: steering damper @
>> ebay
>> (Lenkungsdämpfer)<http://www.ebay.com/sch/i.html?_odkw=lenkungsd%C3%A4mpfer&_osacat=0&_from=R40&LH_PrefLoc=2&_trksid=p2045573.m570.l1313.TR11.TRC1&_nkw=steering+damper&_sacat=0>Make
>> sure you're not using the spring ones for the ladies bycicles, because
>> there's no damping included.
>>
>> 2013/5/29 Logan Streondj <weyounet@xxxxxxxxx>
>>
>>> Steffen, that sounds like a pretty good idea, a steering brake.
>>> maybe even a cheap calliper break, with rounded pads would do the
>>> trick.
>>> assuming can make steering adjustments with legs,
>>> the steering brake would then hold the adjustment.
>>> likely can have the steering brake at the left side,
>>> so can use the rear/main brakes on the right side, simultaneously.
>>>
>>> considering that using a brake is a simpler solution, it's probably
>>> the better one also, fewer moving parts and components, next I guess it
>>> would be good if someone could try it out, though I'm not sure how it would
>>> be mounted, or even how to keep a certain part of the pivot exposed to
>>> allow for applying the brake pads, I'm sure there must be a way.
>>>
>>>
>>> On Wed, May 29, 2013 at 12:54 AM, Steffen Risse <big.skangster@xxxxxxxxx
>>> > wrote:
>>>
>>>> Just a thought from a python triker: Maybe the steering bar is the
>>>> wrong point to work on for high speeds. When I built my trike I used my old
>>>> first try on a python frame and combined it with a wheelchair. While
>>>> completing it with parts I didn't greased the bearings for the steering
>>>> pivot. Half a year later I greased them. After that I noticed a big
>>>> difference while coasting down one of the bridges here in Berlin. The bike
>>>> was more nervous. It also hadn't a slip-stick like behaviour anymore. Maybe
>>>> a steering damper whould therefore help more than a steering bar on the
>>>> frontpart. The problem is, that the damper might has to be connected to the
>>>> speed. Some variable friction in the steering system could might help -
>>>> like a brake on the steering.
>>>>
>>>> Cheers,
>>>> Steffen
>>>>
>>>
>>>
>>
>
>
>
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