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Suspension spring and thickness

Tmuir

By Tmuir
in All Things Clocks

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Tmuir Distinguished Member

Tmuir

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Posted

As mentioned in a post the other day it is hard to get suspension spring in any size other than 0.15mm.

I'm just wondering how much difference it would make to the clock if you used thicker or thinner suspension spring.

Obviously if it is thicker it would take more force to move the pendulum the same amount of arc so a thicker spring would result in a smaller arc of movement of the pendulum and a thinner one more, but the question is how much difference?

I've got a English fusee clock that has a 0.1mm suspension spring fitted whilst cousins sells 0.15mm for English fusee clocks.

Checking the slit in the pendulum rod with a 0.15mm watch spring I can see its fits nicely, so its possible my clock was just fitted with the wrong size spring at some point in the past.

I'm thinking of just sucking it and seeing if 0.15mm suspension spring will work, or does anyone has a way of working out the optimum suspension spring thickness as unlike mainspring sizes which has formulas to use I can find nothing on suspension springs.

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