Mechanical Clock Suspension Spring

$10.00$25.00

Mechanical clock suspension spring

This is the most common suspension spring needed by far. Suspension A1 is for mantle clocks, A2 for wall and grandmother units. The suspension A3 is for larger floor clocks such as a grandfather clock.

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SUS-A: $10.00$25.00

Mechanical clock suspension spring

This is the most common suspension spring needed by far. Suspension A1 is for mantle clocks, A2 for wall and grandmother units. The suspension A3 is for larger floor clocks such as a grandfather clock. It is called a suspension because it suspends the pendulum in the air. It is called a spring because it flexes back and forth. If a spare spring is ordered it would be a good idea. One can be put on the bottom of the weight section of the clock for next time. That way the search to find the next one will be saved.

Does not have to be exact

Naturally, suspension springs do not have to be exact in length. If the clock runs slow, simply raise the pendulum bob with the screw at the bottom. Likewise, if the clock is running fast then turn the nut to lower the pendulum bob.

Most common springs

By and large, suspension spring A is the most common style suspension spring. Of course, it is most likely the one by default. If the old suspension spring looks similar to this one then it is right. As a general rule of thumb, small mantle clocks take suspension A1, wall clocks and small grandmother units will take A2. The A3 size is for grandfather clock units with a larger bob diameter. This size can also be seen on Grandmother clocks with larger bob diameters. The larger A3 is used with large bob diameters so the bob will not wobble front to back. If using a pendulum with a bob of 8 1/2 inch diameter or larger please order suspension A3 for this reason.

Not as common

Urgos uses the single hook style as seen in picture suspension B. However suspension A was also common to use. Very old antique round movements mainly use Suspension C and Suspension D. These are mainly French clocks and US made units made prior to 1945.

Suspension Spring Installation

There are two ways that the suspension spring can be held into the suspension post. One way is to use a thumb, or set screw. When ready, just remove the screw and the suspension spring will fall out of its slot. Another way is to use a tapered pin. This is a pin that is skinny on one end and wide on the other. Push the skinny end through the pre-drilled hole in the suspension post. Push it through the hole in the suspension spring all the way to the other side of the post. Remove it using needle nose pliers. Twist and yank it out from the wide side. Please note, some set screws may be too wide for the suspension top hole. In this case, use a tapered pin to secure the suspension instead of the screw.

Connect the leader

Hook the leader on the v prior to install. The intent is to have the suspension spring hooked and the leader engaged with the crutch. At this point the suspension can be lifted into position as you insert the set screw. Note that the suspension is lifted with the leader hanging on it while the leader is engaged with the crutch as one unit.

What is next

Hang the pendulum on the newly installed leader. Now, give the pendulum a good swing, over swinging it so that it sets the correct beat. No mechanical clock with a pendulum, will run correctly if not put “In Beat”. Not familiar with this term? See the, “How to put My Clock In Beat” instructions.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Additional information

Weight0.1 lbs
Type

A1 = Mantle Clock 5/8 x 5/16, A2 = Wall / Floor Clock 13/16 x 5/16, A3 = Large Floor Clock 1in x 7/16, A4 = Large Floor Clock 1 1/4 x 11/16

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