[python] Re: making a jig -- again
- From: Dirk Bonne <dirk_bonne@xxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Tue, 01 Nov 2005 19:40:48 +0100
On 11/01/2005 01:01 PM, juermaier@xxxxxx wrote:
>Am 29 Oct 2005 um 12:58 hat Dirk Bonne geschrieben:
>
>Hi Dirk
>
>
>>Is it a good idea to use a middle plane at all?
>>
>>
>
>I think so. Even so you can use it only once it is less work to fix all points
>than my frame jig
>
>
I given up on the drilling machine at kvisten (where I weld) ---I'm to
stupid to set it straight. So I'll try the fräser now, hopefully this
works. If it works then making jigs in the future will be a breeze.
>
>
>
>>Is MDF a good idea for jig material? Or should I take some other wood? I
>>
>>
>
>MDF is good, I am thinking of using it too for my TT projekt, 20 mm thickness
>of MDF should
>be enough, because only the fixing points can be welded, than the plane must
>be destroyd for
>round welding.
>
>
I hope I can just sneak in from behind to weld on the inner sides too.
At places I will have 3cms or more of place. The bike frame is quite wide.
Would you varnish the board? It seems like MDF, sucks water like a paper
towel.
>By the way, my green python is made of 16 mm tubes (upper) and 12 mm tubes
>(lower) and
>there is only a little deformation under the seat (approximately 5 mm).
>
>
Where the rear seat mount goes into the rear triangle?
>But little tubes will not gain weight. my python is around 14 kg.
>
>
14kg is certainly acceptable, although I will try to minimise it (not at
all costs of course).
>Much more work with little tubes.
>
>
No problem ;-) I made already a front piece for the second python this
way, I had a jig for a part of it and managed to weld the frontpart
inside of a few hours.
Welding 10x1mm was even not difficult with the MIG. Amazingly, it goes
better if I the MIG on quite high current (number 5, whatever that is),
which you normally weld easily 2-3mm plates with. Just need to be quick
and do stop-start depending on the color of the metal.
>But the filigran design is great and I like it very much.
>
>
dito
>Your design will be very stiff.
>
>If you put the bb nearer to the front wheel, you will gain a better handling
>and less side forces.
>
>
I do not want to heigthen the trail or change the pivot angle. In fact I
would prefer to make the trail even smaller: down to 14cm as the baby
python is, or even smaller. But with the high headset pivot design its
not easily possible (to near to the wheel). Maybe rod ends or simular
will make it possible.
Dirk
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