Re: Adding a Tail shaft to servo's with no tail shaft

Hello,

Keep in mind that the encoder doesn't HAVE TO BE on the motor
shaft...

Your specific situation will determine what you can do; but there
are more than a few cases where encoders are mounted at some other
point in the drive train.

One hobbyist level case is the leadscrew mouting of the encoders in
Aaron Moss's Industrialhobbies.com benchmill conversions.

Hope this helps,

Ballendo

P.S. It may also be possible to mount the encoder on an extension to
the FRONT shaft....



--- In CAD_CAM_EDM_DRO@yahoogroups.com, H & J Johnson
<hjjohnson@...> wrote:

>
> Thanks Wayne, I'm leaning towards a interference or press fit of a

stub'd shaft into a bored hole in the existing shaft.. as you say,
chuck the armature, bore the tail, press in a extension and if need
be machine back true.

>
> The motor is the exact same as a servo motor of the same

manufacture, just that it doesn't have the tail shaft.. I think it
was used for running a conveyor or something that didn't need
feedback as to its speed. I could go back to the manufacture and buy
them direct from them w/ the proper tail shaft but they'd be over
twice the money.. :-)

>
> Jarrett
>
>
>
>
> > jerryflyguy wrote:
> > > I remember someone posting a process they went through to add

a

> > tail
> > > shaft to a DC motor, thus making it possible to put an encoder
> > on it. I
> > > can't find the site in my huge pile of favorites, anyone ever
> > done this
> > > or remember the site I'm thinking of?? I've got my hands on
> > some great
> > > DC motor's but they don't have the tail shaft..
> >
> > I've done it a few times. I take the armature out of the

motor,

> > chuck
> > it up in the lathe and support the end you need to fit the shaft
> > with a
> > fixed steady.
> >
> > Drill, ream, bond a shaft in with a high strength loctite. If
> > you need
> > to you can make the new shaft slightly oversize, and true to

size

> > in the
> > same setup as soon as the loctite has gone off.
> >
> > If you are trying to use a standard DC motor, try to use one

with

> > a
> > skewed rotor, they work better as servo motors.
> >
> > Wayne....
>