Re: [CAD_CAM_EDM_DRO] Re: Souces of Timing/Drive Pulleys

Chris,Ballendo: I have some NEMA 42 stepper motors that have a collet type arrangement to fasten the pulley to the shaft. The motor
shafts are .625" and the pulley is straight bored to 1.000" . I pulled a pulley off of one of my motors to see if there there were
any numbers or identification on them. There was none. They do work very well and are very easy to move on the shaft. You slide the
pulley on the shaft to where you want it and tighten a 7/8" nut and everything is locked tight with no slippage. I don't have a clue
who makes them ,but I could post some pictures somewhere if any one is interested in identifying them. Just let me know and I will
make the time to do that. Carey

ballendo@... wrote:

> Chris,
>
> Taper lock hubs out perform keyways and pins, and are tolerant of
> shaft size variations as well...
>
> Hope this helps.
>
> Ballendo
>
> --- In CAD_CAM_EDM_DRO@y..., Chris Stratton <stratton@m...> wrote:
> > > Why don't you want to bore out the hubs? My plan is to do this,
> bore the
> > > pulleys, and use a taper lock hub to avoid a keyway. (Also avoid
> coming up
> > > with a broach set.) These are Fenner taper lock hubs (from MSC)
> rather
> > > than the integral taper locks built into some pulleys.
> >
> > I'm not familiar with these hubs, but would think that they would
> > require a very precisely machined (ground?) shaft (okay, I know,
> we're
> > _supposed_ to do that for the bearings anyway) and even then they
> > might still slip under high cutting or acceleration loads. If your
> > encoder is upstream of the pulley system, wouldn't some sort of pin
> be
> > safer?
> >
> > Chris
>
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