Missing pendulum parts

[Waxman]

Hello From Oz,
I have an oak longcase clock made by Jas. Howden Edinburgh, circa 1770.
it is complete except for the suspension spring and the pendulum rod, I would like to know the method of hanging the rod, ie fixing the rod to the spring and also the rod diameter, and what is the method to calculate the length of the spring and the rod.
I have the bottom part with the nut that fits into the bob.

Thanks Waxman.

 

[RickB]

Pictures of what you have would help.

 

[Waxman]

Re: Missing pendulum parts (pics added)

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Pic of top of clock and the only part I have of the suspension rod. which is the part that fits the bob, the bob weighs 3.5 Lbs.​

 

[LaBounty]

Re: Missing pendulum parts (pics added)

Hey Waxman-

All of the parts you need are available through parts houses like Merritt's or Timesavers.

You need...

Suspension unit: Timesavers part no. 12291 or Merritt's part no. P-10
Pendulum rod: Timesavers part no. 12289 or Merritt's part no. P-26A

Your rating assembly has been damaged; the threaded hole at the top has been blown out. You can either repair it or replace it.

Replacement rating assembly: Timesavers part no. 12290 or Merritt's part no. P-26B

The pendulum rod threads into the lower block of the suspension unit and into the top of the rating assembly. The threads in the rating assembly and suspension unit may be different than the pendulum rod so be prepared to change some threads in order to get things to work.

Photos of these parts can be found on the parts houses' respective sites.

Good luck with it! That movement looks like quite a project .

 

[Waxman]

Thanks for all that info, if you think the movement is a big project you should see the case
I will post a couple of pics when it's finished, about Christmas time!
Thanks again, Waxman.