Re: DC motor controller - CW ?

Hi Dave,

That's exactly what happened. When I got it I put a nut
(1/2-13) on it and reversing it wheeled it right off.

I still haven't found it.

Didn't you recently get a used Roland or something like it?

John



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

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Hansford" <kz1927@>
> wrote:
> >
> > Hi Dave,Ron,
> >
> > Pictures...
> > http://www.flickr.com/photos/26361144@N00/
> >
> > I took the CW to mean the nut would probably fly off if it ran
> > the other way. I opened it ...Nothing flew apart.
> >
> > What's the Bad news...How _BAD_ could they be as servos?
> >
> > I wouldn't have noticed the very slight cogging if I weren't
> > trying to find it.
> >
> >
> > John
>
>
> Hi John,
>
> Look at your picture 02. it shows the end of the shaft, 17mm, as
> well as a 1/2-13 left hand thread.
>
> what the treadmill used to have, is a large cast iron pulley with a
> multi grouve belt. the pulley was small, probably under 1-1/2" dia,
> but the flywheel was large, 7 inches or so, and cast iron.
>
> My point was, that if you ran the motor in reverse, the flywheel would
> unscrew. Once you use the 17mm shaft instead of the threaded part,
> the problem goes away.
>
> Dave
>
>
>
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> > <dave_mucha@> wrote:
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@>

wrote:

> > > >
> > > > John,
> > > >
> > > > See the "CW" for rotation on the motor tag? That means it's
> > > intended to spin only one direction. Possibly the brushes are

mounted

> > > angular or offset to the shaft allowing only one direction of
> > > rotation. If thats the case it will not work, for long anyway.
> > >
> > >
> > > I think the CW could mean one of two things. As you mentioned, the
> > > burshes are not mounted perfectly symetrical, but rather

optimized so

> > > spinning on one directin is more efficent or powerful, or some such.
> > >
> > > The would mean the brushes are not dead-on-balls-accurate (an

industry

> > > term) 180.00 degres.
> > >
> > > The other possibility is that the thread on the screw is such

that if

> > > the motor spun the opposite way, the pulley would just spin off.
> > >
> > > Since these are custom motors, the label could reflect either of the
> > > above.
> > >
> > > Testing would show the differences.
> > >
> > > Dave
> > >
> >
>