Hi Paul,
there is a bit on the openbike wiki http://en.openbike.org/wiki/Gerald
and on Jürgens Project Survey page
http://www.python-lowracer.de/projects.html#p35
Gerald
Am 08.04.2015 um 22:52 schrieb paul needham:
Gerald
Thanks for that are there other pictures of your build on the net it does not familiar to me ?
My current trike uses a mount plate of 2 x 3mm pieces welded to make a single piece 6mm thick , I think I have made them big enough so they can be converted into BB pivot mounts at a later date.
Currently I have one python trike with rod end bearings for pivots.
This posts shows them :- http://forum.atomiczombie.com/showthread.php/8210-Building-a-python-trike?p=96797#post96797
I am building a new configuration rear end that will initially just pick up the rod end mountings so I can attach it to the existing front end.
Then when I build the new front end and change the pivot to a one piece BB and the new rear will be converted to take that.
then I will have 2 trikes ....
regards Paul
On 08/04/15 17:22, bepb wrote:
Hi,
I made good experience with 'turning' the pivot around - welding the tube part to the frame and use two short pieces of rectangular tubes and two pieces of flat bar to form the hinge on the front part side:
Pivot
It also gives you more room to weld the front tubes to the pivot and more room between the tubes of the front part. Which is good because it save some bending of the front tubes.
The disadvantage is that it restricts the moving range of the pivot to much if you are not carefull with the position of the pivot bore. I made mine to allow a 90 degree steering angle. If you position the pivot bores to far to the rear, you need stronger flat bar to avoid bending.
I hope you can see what I mean from the picture.
The button and up flat bar pieces in this example are 4mm strong.
Gerald
Am 07.04.2015 um 20:16 schrieb Dirk Bonne:
No, mine was just a boring "U" with two holes:
http://dirkb.dnsalias.net/image/python/pivot-reinforced.hires.jpg
and on http://dirkb.dnsalias.net/pythonbuilding.html you can see a CAD drawing. The pivot was a not very good because only two washers protected the bearings. The bearings should have been a sealed version instead.
The solution with a latch is much better for assembly and doesn't seem that complex.
Dirk
*Gesendet:* Dienstag, 07. April 2015 um 20:00 Uhr
*Von:* "paul needham" <paul.2.needham@xxxxxxxxx>
*An:* python@xxxxxxxxxxxxx
*Betreff:* [python] Re: Aw: Using a BB for a pivot
Dirk
Luckily mine is a trike so stands on it's rear wheels.
Is yours a one piece BB ?
I assume the latch is held in place with the BB screw/nut and a suitable
washer ?
Are there pictures on the net of your implementation ?
Paul
On 07/04/15 10:38, Dirk Bonne wrote:
> Aaah, I take that back. Turning the holder upside down is not a good
> idea, as it is a safety feature that the latch is up.
> By the way, the BB has a tendency to unscrew on my bike.
> Dirk
> *Gesendet:* Dienstag, 07. April 2015 um 11:31 Uhr
> *Von:* "Dirk Bonne" <dbonne@xxxxxxx>
> *An:* python@xxxxxxxxxxxxx
> *Betreff:* [python] Aw: Using a BB for a pivot
> Hi Paul,
> I used 6.5mm on the baby python (didn't have a BB but similar axle
> distance).
> The idea with the latch is very nice. If your bike will be fitted with
> a bike stand on the rear part you might want to turn the holder upside
> down to ease the assembly of the front onto the rear part.
> Dirk
> *Gesendet:* Dienstag, 07. April 2015 um 08:54 Uhr
> *Von:* "paul needham" <paul.2.needham@xxxxxxxxx>
> *An:* python@xxxxxxxxxxxxx
> *Betreff:* [python] Using a BB for a pivot
> Hi all
>
> Is the owner of this web site still a visitor to this forum ?
>
> http://www.lasinenherne.net/recumbent.html
>
> I would like to replicate his BB mount however I am unsure of the
> thickness of steel used ?
>
> From the pictures of the actual bike it looks like there are additional
> pieces top and bottom providing some triangulation ?
>
> Has anyone else used a BB without using steel crank arms to mount it to
> the backbone ?
>
> regards Paul
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