Need help with stepper motor & safe idea

[Sammy Taylor]

I need a DC stepper to make the lock for a small timer safe. Think of a flat
piece of steel about 2" x 1/2" . I drill a hole in one end and slip it onto
the shaft of the stepper then attach it there. Then mount this on the door
to rotate into and out of a slot on the jamb -- just a very simple kind of
latch that will toggle open or closed w/o power having to be continuously
applied.

How does one normally attach something to the shaft of a stepper -- can I
just weld it? What diameter shaft makes sense? Where can I get a stout
battery-operated stepper (i.e. can you help me filter the Google hits?)

What would work better than this dumb idea? (Note: the safe uses an INTERNAL
timer and battery. It must be able to latch or unlatch and STAY that way w/o
power being applied until somebody opens the door.)

Thanks.

Sammy

 

[Homer J Simpson]

I need a DC stepper to make the lock for a small timer safe. Think of a
flat piece of steel about 2" x 1/2" . I drill a hole in one end and slip it
onto the shaft of the stepper then attach it there. Then mount this on the
door to rotate into and out of a slot on the jamb -- just a very simple
kind of latch that will toggle open or closed w/o power having to be
continuously applied.

How does one normally attach something to the shaft of a stepper -- can I
just weld it? What diameter shaft makes sense? Where can I get a stout
battery-operated stepper (i.e. can you help me filter the Google hits?)

What would work better than this dumb idea? (Note: the safe uses an
INTERNAL timer and battery. It must be able to latch or unlatch and STAY
that way w/o power being applied until somebody opens the door.)

What happens if the battery goes flat?

 

[William P.N. Smith]

My safes have a gearmotor that pulls a latch open, clossing the safe
re-engages the latch.

What happens if the battery goes flat?

All of my electronic safes have a battery inside the safe _and_ a
battery outside the safe, so if they both go dead you can replace the
outside one and still operate it.

 

[Alan 'A.J.' Franzman]

I need a DC stepper to make the lock for a small timer safe. Think of a flat
piece of steel about 2" x 1/2" . I drill a hole in one end and slip it onto
the shaft of the stepper then attach it there. Then mount this on the door
to rotate into and out of a slot on the jamb -- just a very simple kind of
latch that will toggle open or closed w/o power having to be continuously
applied.

How does one normally attach something to the shaft of a stepper -- can I
just weld it? What diameter shaft makes sense? Where can I get a stout
battery-operated stepper (i.e. can you help me filter the Google hits?)

What would work better than this dumb idea? (Note: the safe uses an INTERNAL
timer and battery. It must be able to latch or unlatch and STAY that way w/o
power being applied until somebody opens the door.)

Stepper motor? I'd use a dual-action solenoid (like those used in car door
locks).

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Alan "A.J." Franzman

Email: a.j.franzman [ A T ] verizon [ D O T ] net

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