The article mentions that it was from INAV Feb. 1993, #21. Except when you go to INAV's new website (
http://indoornewsandviews.wordpress.com/downloads/) and try to find that article, it doesn't exist. Issue #20/21 is from January 1986 and the mention of Bernard Hunt is only contest results...
Regards.
Mike Kirda
--- In Indoor_Construction_at_yahoogroups.com, "joemargbartek" <j.bartek@...> wrote:
>
> Mike
>
> Thanks for looking. I went to the Articles tab on the INAV site and found "rubber testing" article by Bernard Hunt from 1993. He mentions integrating torque Vs. turns curves or load vs. extension curves. his units for specific energy are cm. I've got a much better idea of what's going on. The refernce to the public article follows.
>
> Joe
>
> http://www.indoorduration.com/RubberTest.HTM
>
> --- In Indoor_Construction_at_yahoogroups.com, "mkirda@" <mkirda@> wrote:
> >
> > 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 Thu Nov 15 2012 - 07:49:18 CET