Re: Bridgeport retrofit servo questions

I saw something like that to..but i think this guy mounted a grinder
in the spindle and ground the shaft to size...

Also most duel shaft motors should have both ends counter sunk, could
mount in lathe...Could put one shaft in collet and other shaft on
live center...then fasten body of motor to something so it will not
turn and keep motor wires insulated from each other...If they would
touch motor would act as generator and make lots of torque...Body of
motor would then try to spin....


Wally

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "washcomp" <jeff@w...> wrote:
>
> This is not directly related, but I thought the application was
> pretty cool, so I'll throw it out here:
>
> I saw a photo (I forget where) of a guy who wanted to reduce the
> shaft size of one of his motors. He clamped the motor to the table
> of his Bridgeport (shaft up). He then put a boring bar in a
> Brigeport tool holder and ran the motor. He used the boring bar as
a
> lathe tool against the turning motor shaft. I suspect getting it
> right the first time is REAL important <G>
>
> Jeff
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "braidmeister"
> <braidmeister@y...> wrote:
> >
> > No...for a few reasons...and take with grain of salt because I am
> no
> > expert ~ learning here too!
> >
> > 1. the shaft size of the motors I mentioned is .625". The hole in
> > that encoder is only .25".
> >
> > 2. the shaft of the motor is 1" long. You need an encoder with a
> thru
> > hole option for the shaft to poke thru. You may also need an amp
> for
> > the encoder (as mentioned on US Digital) if the leads are longer
> than
> > 2 meters (doubt it) when using an open encoder.
> >
> > 3. That encoder only gives you 200 lines per rev. If used on a BP
> > with 1:1 gearing, there may not be enough lines on the encoder to
> get
> > tight tolerance. If you increase the number of lines, the servo
can
> > be more precisely governed. Now...just for an anaolgy, if you
> changed
> > the belt ratio to let's say 4:1, then the motor would have to
turn
> 4
> > times for each turn of the screw (actually 20X/1" if using .2"
> > pitch)...therfore one turn of the pulley @ 1:1 might move the
> > axis .2" where a 4:1 would move it only .05". You can imagine how
> > much movement the motor would have between encoder lines if run
> > 1:1...this is why Les suggested running a higher line encoder so
> that
> > the distance between the 2 lines is smaller ~ resulting in less
> slop.
> >
> > Does that make any kind of sense? Again...don't take this as
> > gospel...I'm in the same class as you! (the one in the back
> throwing
> > paper airplanes)
> >
> > -Brady
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Luke1027 <luke1027@p...>
> > wrote:
> > > Brady,
> > >
> > > What about the encoders off this motor?
> > > Buy the motor, pull the encoder, and discard the motor....
> > > would it work?
> > > http://www.surpluscenter.com/item.asp?
> > UID=2005011818310844&catname=&qty=1&item=10-1834
> > > I am very limited on electronics ... but trying to learn fast
to
> > convert
> > > my BP to servos.
> > >
> > > Luke
> > >
> > > braidmeister wrote:
> > >
> > > >.... and it has a
> > > >long enough rear shaft to mount a number of encoders. Looks
like
> > one
> > > >of the US Digital ones will work nicely. ...
> > > >
> > > >-Brady
> > > >
> > > >
> > > >