Re: [CAD_CAM_EDM_DRO] Re: simple stepper power question.

Hi, go to the fishing shop and get an electronic scale for weighing fish! my
brother uses one for balancing blade combinations for a big planer! cul
brian f.

----- Original Message -----
From: "ballendo" <ballendo@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, April 19, 2002 10:44 AM
Subject: [CAD_CAM_EDM_DRO] Re: simple stepper power question.


> Alan,
>
> Spring scales share a bit with our machines...
>
> Most are pretty repeatable, but NOT very accurate.
>
> If you can find a repeatable one, you can calibrate it into accuracy.
> Which means using weights to reset the scale to what it REALLY is
> registering. Do this, and most any scale will work. HF sells one, and
> most sporting goods stores will have 'em.
>
> Hope this helps,
>
> Ballendo
>
>
> --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> > Hi Dan,
> >
> > That sounds like a good system. I haven't seen good spring scales
> > around, 'tho. Where did you find yours?
> >
> > Also, I recall that Mariss posted a schematic of a Dynamometer
> circuit a
> > while back. It's under "circuits" in the files section.
> >
> >
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/CIRCUITS/DYNOMOMET
> ER%20CIRCUIT.pdf
> >
> > I've been wanting to try this approach to motor testing.
> >
> > Alan KM6VV
> >
> > Dan Mauch wrote:
> > >
> > > When I first got started in cnc and step motor driver kits,I
> looked at
> > > ways to measure the torque of various motors and the performance
> of
> > > various drivers at various output voltage. I heard of using a
> weight
> > > with a pulley on the motor and figured that was too crude.
> > > So I designed my own and machined a flanged pulley for the
> stepper motor
> > > to a radius of .967 and that added to one half of the thickness
> of my
> > > nylon cord equaled 1.00" radius so my readings would be in oz
> inches. I
> > > made a motor mount and then using a deadhead on one side I
> attached a
> > > spring scale. With the motor running at the speed I wanted, it(the
> > > pulley)performs like a capstan. When the cord is slack, it slips
> and no
> > > torque is noted. As I pull (I have a spring scale on this side to
> > > measure this pull also)on the other end of the cord that is
> wrapped
> > > several times around the pulley which has a spring scale, I note
> the
> > > reading on the spring scale. I set up a matrix and recorded the
> torque
> > > and the current for each speed I wanted to measure. There's a bit
> more
> > > to it but is much more controllable than other methods and it got
> the
> > > measurements that I wanted.
> > > Dan
> > >
> > > -----Original Message-----
> > > From: dave_ace_me [mailto:davemucha@j...]
> > > Sent: Thursday, April 18, 2002 5:07 AM
> > > To: CAD_CAM_EDM_DRO@y...
> > > Subject: [CAD_CAM_EDM_DRO] simple stepper power question.
> > >
> > > is there a formula to determine power of a stepper ?
> > >
> > > I have a Slo-Syn NEMA 34, 1.7 volt, 4.5 amp
> > > single stack.
> > >
> > > Also, has anyone put together a simple test
> > > for stepper power ? Seems like a weight,
> > > and a long crank arm with holes drilled
> > > each inch would allow one to keep moving
> > > the wieght farther out until the motor
> > > started missing steps.
> > >
> > > Dave
>
>
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