Seth Thomas #120

 In for repair is a Seth Thomas number 120 mantle clock movement.  Only the movement was given.  There was no pendulum bob.  The work begins.........

The image below shows the front plate before any work has been completed.  The mainspring power would be let down and wheels rotated to see how much wear is present in each wheel.  See below for a short video demonstrating the wear.

Back plate

Front plate partially disassembled.  Mainspring plate and wheels removed along with the front motion works and levers removed.  As you can see the worn pivots holes were marked.  There were 5 pivot holes on the front plate that needed rebuilding and 7 holes on the back.  12 in total.

Back plate marked.  Click this image below to display a short video of the pivot hole wear

This image shows the front plate removed and the location of all the wheels.

The video below demonstrates a clock wheel after the pivot was polished and the pivot hole was rebuilt.  Smooth running wheel.  This is an example of all the wheels after rebuilding

Winding bridge with both mainsprings.  The mainsprings were removed, cleaned, reassembled, then oiled.

One of the issues with this clock was the minute hand tension was weak.  Once the top plate was removed an inspection showed the tension washer on the minute pipe was weak causing the play in the minute hand pipe

It is hard to see in this image but the tension washer provided no tension what-so-ever.  

The washer had to be removed and formed to provide significant tension.  In this image, the tension washer is removed and the 3 fingers providing tension were modified to supply the appropriate tension.

After all repairs have been completed the entire movement, plates, wheels, levers, mainsprings, etc was placed in the ultrasonic cleaner.  Once clean, rinsed dried, and reassembled.

The strike mechanism was adjusted and the time mechanism was put in beat.  Testing was done and passed with flying colors.  The customer did not supply the case and did not have a pendulum bob for the clock.  A bob was suppled.

Once the movement passed all tests, the movement was given back to the owner.