When it comes to replacement movements and motors for corrective and non corrective clocks american time is the industry leader. It covers both closed and open rotors.
Hammond Synchronous Clock Motor Youtube
This book does not cover the hammond bichronous clock.
Hammond clock motor repair. Hammond rotors always require opening. That would be two pulses per cycle and 120 pulses per second with a 60 cycle current source. This book shows with photographs exactly how to.
If you follow the order of my pics youll be able to see my progress. Rebuilding these motors cost 15000 plus 1500 priority mail canada is 4000 and has a 2 year warranty which brings your total cost to 16500. I was given one of these clocks and since it did not run i took the motor apart because i had nothing to lose.
Identify hammond synchronous motors rebuild the. I must have the old motor. General description the run motor is a non self starting synchronous motor.
Excellent book and highly recommended. Postal telegraphs with a hammond clock motor the rest of this web page concerns itself with other clocks that the hammond motor is installed in or just the motor itself. It may be available thru the nawcc i havent checked.
These motors do not usually have many. The second is disassembled. 1500 for 50 cycle.
Electric clock rotor and motor restorations. 8 hammond electric alarm clock. We need to take the same measurements and run the same initial test procedure to determine the optimum number of turns.
I include a picture i borrowed from craig shields book on hammond clocks maintenance and repair. Overhaul hammond clock motor 15000 labor and cleaning of movement 5000 return shipping and handling 6000 total 26000 the above assumes you ship the entire clock and does not include a warranty on the movement mechanism because that may need to be overhauled as well. You can tell the type of motor your hammond clock has by the back plate.
Many electric clocks have motors that are no longer available so repairers are unable to repair them and lamentably resort to converting them to quartz. One is plugged in and keeping very good time for the past 5 days. On ebay i bought 2 hammond clocks with essentially the same electric movement.
The motor on this clock stopped working. Synchronous motors are used in hundreds of hammond clock models. The open rotor and the sealed rotor.
To get your clocks ticking again call the clock experts at 800 328 8996 and we will assist you in identifying and selecting your replacement clock motor or movement. The hammond clock uses a completely different type of synchronous motor but the basic principle is exactly the same. Rpm is 1200 for 60 cycle motors.
Output bushings shafts and internal plate holes are often worn requiring disassembly and repair. The hammond motor is one. Rather than delivering a constant power it delivers a series of pulsations one for every half cycle.
This book shows how to repair the two most common hammond synchronous clock motor types. The challenge for the clock repair person is the level of custom machining and fabrication that is needed to carry out the repairs on self winding clocks.
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