[Hammarlund] A Hammarlund Clock Motors and Rotors

[Barry Hauser]

A possible correction -- the rotors in the Hammarlund clocks may well be
3.6 RPM -- a popular configuration, not 1 RPM.

I seem to remember it as 3.6, but it's been a while.  You can check by
marking one tooth on the gear on the rotor and manually rotating the
works -- or if someone knows, that would help.

The rotor is not special to 24 hr. clocks.  That's done with the gearing
of the rest of the mechanism.

Barry


On Tue, 16 Dec 2003 00:51:53 -0500 Barry Hauser <barry_hauser@juno.com>
writes:
> Hi Craig and List
> 
> That's a simplex rather than a synchronous.  They say it has 20 
> times the
> torque, which might be good to avoid stalling -- or maybe not.
> 
> One question is whether that replacement motor is more or less noisy 
> --
> mechanically or electrically.
> 
> Actually, the part I harvested from the old alarm clock looks like 
> this
> item:
> 
> http://www.merritts.com/store2/main/product.asp?ProductID=82218
> 
> As I recall, it was an H-type rotor, I'm less sure about the MS3632
> designation.  Generally the field coil assembly is still good.  The 
> small
> cylindrical end of the rotor snugly fits into the field coil 
> assembly
> which is rotated so the gear meshes.  However, I had to swap the 
> small
> drive gear between the old and new rotors -- the "new" one wasn't 
> right. 
> You have to do that carefully as they are brass and rather soft, so 
> work
> around in a circle gently prying up with a suitable tool, like a
> jeweler's screwdriver.
> 
> The replacement rotor is somewhat more money than the replacement 
> motor
> -- $35, and there is some chance of going wrong.
> 
> Another factor is the RPM's.  The replacement motor is 1 rpm, which
> sounds right
> 
> I think I paid something like $3 for that alarm clock -- a simple 
> '50's
> pink one for a girl's bedroom, I guess.  There may be a clue from 
> the
> outside.  I believe the ones with the H-rotor will have clock model
> numbers with an H- prefix.  If you can find them cheap enough, you 
> can do
> several tries before you equal the cost of that replacement rotor. 
> Before going after a clock or that replacement rotor, I suggest  you 
> pull
> the clock, disassemble as needed to read whatever markings on the 
> motor
> and the rotor itself.  I'll take a peek on the e-place to see if 
> there
> are any likely candidates and privately send them to  you -- if I 
> find
> any.
> 
> Hope this helps.
> 
> Barry
> 
> 
> On Mon, 15 Dec 2003 22:28:31 -0500 "Craig Roberts" 
> <crgrbrts@verizon.net>
> writes:
> > Hello Barry and friends,
> > 
> > Thanks for tip on swapping Telechron motors, Barry. I was thinking 
> 
> > of doing
> > just that and had planned to stalk Ebay and a few yard sales.  
> Then, 
> > I found
> > a source online for replacement Telechron-compatible motors. This 
> 
> > one looks
> > like it would mate with the clockworks, doesn't it?
> > 
> > http://www.merritts.com/store2/main/product.asp?ProductID=81484
> > 
> > I'm going to contact the vendor tomorrow with some Hammarlund 
> clock 
> > specs
> > and a picture and let y'all know.
> > 
> > Thanks again & 73,
> > 
> > Craig
> > W3CRR
> > 
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