Re: Rubber testing - some info

From: <mkirda_at_sbcglobal.net>
Date: Thu, 15 Nov 2012 02:20:26 -0000

The term 'Rubber test' appears in the following volumes:
1990 p71, 148,680
1980 p32,48
1970 p.54,56, 64,86, 192,424
I did not try 1960s and it did not appear in the 2000's.

I did not see the formulas though...

Regards.
Mike Kirda

--- In Indoor_Construction_at_yahoogroups.com, "mkirda@..." <mkirda@...> wrote:
>
> Tapio apparently did an article in this year's NFFS symposium on 'Practical Rubber testing'. I don't have it yet. I'm sure Jeff used a formula from somewhere - maybe he can chime in.
>
> I will search the INAV archives tonight to see what is there...
>
> Regards.
> Mike Kirda
>
> --- In Indoor_Construction_at_yahoogroups.com, "joemargbartek" <j.bartek@> wrote:
> >
> > Mike
> > Has a reference been posted to the formula Jeff uses to get energy? Is it in a particular issue of INAV?
> >
> > Joe
> >
> > --- In Indoor_Construction_at_yahoogroups.com, "mkirda@" <mkirda@> wrote:
> > >
> > > Greetings.
> > >
> > > Jeff Annis sent me the spreadsheet he uses for computing the energy level of rubber.
> > >
> > > After some false starts, I have learned a few things.
> > >
> > > 1) Three of the four batches of rubber are nearly the same at near 4000.
> > > 2) 6/12 Tan SS is the worst at 3400 at best.
> > > 3) A second wind immediately after the first may get you 200 more turns, but energy return is significantly (15%) less. With the Tan SS I have, you really run the risk of breaking the motor - which somewhat explains the problems I had earlier I thought were related to the o-rings I was using.
> > >
> > > I have been winding ~.054" motors to .55 or so in-oz of Torque, then unwinding 20 turns at first, then 50, sometimes up to 100. After unwinding, it takes some time for the torque meter to steady. A light thump on the rubber seems to make is stabilize quickly. A lot of data points are involved.
> > >
> > > I'll probably share the data after I compile some more.
> > >
> > > Regards.
> > > Mike Kirda
> > >
> >
>
Received on Wed Nov 14 2012 - 18:20:30 CET