Re: [CAD_CAM_EDM_DRO] stuck stepper

Hi, well i have worked on many steppers with good luck. i use .002 steel
shim stock and make a thin tube slightly bigger than the od of the rotor. i
slide the rotor into the tube from the housing. you can slide the tube back
to get at 1/2 the rotor and slide the other way to clean the second half. I
use an osha nozzle with a .01 slit and 170 psi, if its rust a stiff
toothbrush with a small amount of mystery oil will help. make sure you wipe
off good with a lint free rag. If the magnet is real strong i make a wooden
ring to fit the end of the motor, helps prevent more damage. you must make a
good clamp to hold the housing so you can work the magnet rotor with 2
hands. a vise will ruin the motor but a 2 piece wood clamp with jaws bored
to od of motor and lined with tire tube rubber will hold nicely. Dont blow
all the special greese out of the bearings tho! cul brian f.

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, September 11, 2002 5:55 PM
Subject: Re: [CAD_CAM_EDM_DRO] stuck stepper


> Dave: Without SEEING it myself, I would guess that there is magnetic
swarf
> between the rotor and stator "teeth" inside. The "gap" between those is
just
> a few mils, so a "tiny" chip of that hard magnetic stuff can jam things.
>
> It is a "no-no" to dismantle a stepper (because THIS happens!), but if it
> ain't no good, no-how, then carefully remove the four screws, pull it
apart,
> blow off the swarf with 100 psi blow-gun with an OSHA-DISapproved tip, and
> try slipping it back together with maybe some stiff paper wrapped around
the
> rotor, to prevent "banging" and chipping. Then, slip that paper out when
you
> JUST-can't get your fingers or tweezers "in there" anymore, and
re-assemble.
> It's a learning project, at least!
>
> Let us know if this worked!
>
> Jan Rowland, Ignernt old Troll
>
>
> [Non-text portions of this message have been removed]
>
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