Re: Need help with Dyno design

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@y...> wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
> wrote:
> > Wally, Wouldn't it be easier to turn a 2"long X 2.125 dia spool

in

> the lathe with a 16 tpi groove on its diameter. Mount spool on

motor

> shaft, wind a cable on the spool with different weights suspended
> from it? Steel is .282 pounds per cubic inch to calculate the
> standards. Run different Rpm's and distances to see where it skips.
> Could run that Eckstein's DRO system with an encoder mounted on

shaft

> to verify. Or a simple reference mark from shaft to motor body.
> >
> > Ron
>
> I was thinking of a simple home version. A motor mount, a pulley

as

> you described, possibly a 1" screw as the spool, and a pulley on

the

> ceiling with a rope to a bucket.
>
> add water, nuts and bolts, or whatever.
>
> you can mark the height that the ramping ends and run tests on that.
>
> Since most steppers fail entirly when missing steps, it would be
> interesting to see.
>
> I also though about adding washers on a string so as the bucket

kept

> moving it would have weights added automatically.
>
> Dave

Wow, cleaver idea, the pully on the ceiling would give a lot of added
lenght, and adding weight on the way up is cleaver to. Now i am
thinking the spool would be huge though, to take up all that cable.
It would have to be very large diamater or very long. I kind of had
my heart set on electronic method, but i will think about this a
little...


Wally