For two dimensional diferent wires of same quality (same modulus)
angle of wire twist Phi under torque T is:
Phi2=Phi1*(T2/T1)*(L2/L1)*(D1/D2)^4
where are:
Phi is angle of rotation,
T is torque
L is lenght
D is diameter
index 1 is for first wire, index 2 for second wire.
If you know data for one wire you can calculate data for the second.
Try this with data of Akihiro Danjo, where L2/L1=1, and Phi1=Phi2. In this case is:
T1/T2=(D1/D2)^4
And so on ....
--- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo <tapio.linkosalo@...> wrote:
>
> Akihiro Danjo wrote:
> >
> >
> > > I built my first attempt last weekend, and about 20cm of 0.3mm wire
> > > gives about 30 g*cm for 360 degrees rotation, but that may be a little
> > > too loose? Going up to 0.35mm wire would double the stiffness...
> >
> > Tapio san,
> > Is your data correct?
> > I have a data and it says, 10cm (not 20cm) wire,
> > 0.30mm = 43 gcm
> > 0.33mm = 61 gcm
> > 0.36mm = 79 gcm
> > per turn.
> > If this is correct, I think you should use 20cm of 0.36 (or 0.40) mm wire.
>
> Grhm, not quite. The torque wire is rather 12 to 14cm long, not 20. It
> still seems to deflect full turn on 30g*cm rather than 40, but I'll have
> to check that. Maybe my wire is 0.28 rather than 0.30, and thus looser...
>
>
>
> -Tapio-
>
Received on Tue Sep 01 2009 - 13:46:05 CEST
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET