Re: [CAD_CAM_EDM_DRO] Drill and tap stepper motor shaft?

Hi Jason, Dan,

I agree, I wouldn't try to drill and tap the "hidden end". I have been
able to mill flats on the "working end". Didn't seem too tough. Just
had to make up a bracket to "mount" the motor on the Sherline bed, and
then a collar to "lock" the shaft. Light cuts with coolant, and keep
the swarf away from the motor (these were Sanyo Denki).

Next one I need to do is drill the "working end" on one for a "drive
pin". This is to be perpendicular to the shaft of the motor. Drives a
collar, with a pair of slots at right angles. Cheap direct drive for a
Z-axis lead screw (PCB router).

Alan KM6VV


Dan Mauch wrote:

>
> I had some scrap motors around and tried this on 4 motors. Only one was
> successful.
> Those stepper motor shafts are pretty hard material. I believe they are
> stainless steel. You would have to chuck up the motor shaft side in a
> lathe, center drill it, then carefully drill and tap it. You have to be
> very careful not to get chips into the motor so pack the area around the
> shaft with clay. If you have a nema 23 motor then the shaft is only
> 1/4"D so you would have to drill and tap for a thread no greater than
> 8-32.
> The other problem you would have is that when turning the handle
> clockwise the retaining screw would tend to get tighter and when turned
> counterclockwise would tend to loosen so figure to use locktite on the
> threads at assembly.
> Dan
>
> -----Original Message-----
> From: andesign2@... [mailto:andesign2@...]
> Sent: Monday, November 05, 2001 7:42 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Drill and tap stepper motor shaft?
>
> I am in the process of adding stepper motors to my Taig mill. The
> motors are single shafted, however I would like to be able to put
> handles on the motors so I can use the mill in manual mode. While
> playing with the motors today I realized that there was a hole in the
> back case under the specification sticker. The hole exposes the back
> of the motor shaft. Is it possible to drill & tap the back of the
> shaft so I can rig up some sort of handle? Will drilling & tapping
> hurt the motor?
>
> Thank You,
>
> Jason
>
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