Re: Making a bracket

The hub is for a few reasons.

One is to make sure the motor is located properly and allow for exact
alignment for replacement motors.

It takes the pressure off the bolts

and it allows all the side pressure from a pulley to be transmitted
to the motor bearing and not allow the tightening of the mounting
screws to warp the housing.

If you can do the bore do so. required if you use direct drive, for
alignment purposes.

Since the NEMA23 does not require too much force, if you use a
pulley, you can get away with just the mouning bolts. But you do
need clearnace for the hub as it holds the bearing and if it has any
pressure it may warp and cause problems.

Dave


--- In CAD_CAM_EDM_DRO@y..., "stevenson_engineers" <machines@n...>
wrote:

> >--- In CAD_CAM_EDM_DRO@y..., "Kory Hamzeh" <kory@a...> wrote:
> Kory,
> Just bore a shallow recess 1.5" diameter to accept the register on
> the stepper motor. This will allow you to always get this lined up
> centrally . Then bore the hole thru large enough for the coupling

to

> enter. There is no need to open the hole up to the full 1.5" if you
> feel it wil weaken the design.
>
> John S.
> >
> > I'm matching a bracket for a Nema 24 stepper motor and the motor
> that I
> > have (and all the one I've seen) have a 1.5" diameter

raised "boss"

> (not
> > sure if that is the right word) centered where the shaft comes

out

> in the
> > front. Now, my question is, do I need to bore a 1.5" hole in the
> bracket
> > also, or can I just bore a hole larger than the shaft diameter? I
> plan to
> > mount the stepper using the four mounting holes in the corner of
> it. I was
> > concerned that boring a 1.5" hole would effect the rigidity of

the

> bracket.
> > This stepper is a large 250 oz/in motor that weight 3 lbs.
> >
> > Thanks,
> > Kory