Paxolin rod/bar anything similar?

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raynerd:
Thanks for all the replies, I've just ordered from daves industrial plastics as some of you recommended as it was a good price and obviously you have had good service. I've just got 30cm of 12mm dia. Hopefully should work ok - I don't think it is too critical, just anything instead of metal to reduce changes due to temperature change. Thanks again!! :nrocks: :nrocks:

Bluechip:

--- Quote from: craynerd on May 21, 2011, 09:04:59 AM ---Thanks for all the replies, I've just ordered from daves industrial plastics as some of you recommended as it was a good price and obviously you have had good service. I've just got 30cm of 12mm dia. Hopefully should work ok - I don't think it is too critical, just anything instead of metal to reduce changes due to temperature change. Thanks again!! :nrocks: :nrocks:

--- End quote ---

Chris

Are you sure you're on the right track ??

A lot of 'plastics' expand considerably ...

Like PVC for instance ...

You might think aluminium is bad, PVC is > 2x aluminium.

Dunno about tufnol, can't find the numbers ... :scratch:

Table at the bottom of this. That Invar stuff is used for clock pendulums. As you probably know ..

http://en.wikipedia.org/wiki/Expansion_rate

Dave BC

lordedmond:
Good for no metal bits usual disclaimer other that a satisfied customer they are very quick with del.

http://www.directplasticsonline.co.uk/

Stuart

Lew_Merrick_PE:
Chris,

Paxolin is a tradename for a phenolic resin/linen composite material. It is probably also available as a phenolic resin/paper material, but that did not leap out and bite me on a quick Google search. The question for you is what are the temperature, humidity, and operating stresses in which this part is required to function? Typical epoxy-glass (e-glass type fiberglass) materials are relatively limited in temperature and humidity regimes (i.e. < 100°C and <65% RH) if there is any significant load (stress).

raynerd:
The working conditions are room temperature ... for the pendulum rod of a clock :headbang: The plans call for a 1/2" paxolin rod of 6" length. I believe paxolin is used to reduce expansion and lower it from that which would occur if a metal pendulum rod was used. Obviously if the pendulum rod length changed, the period changes and your clock goes out of time.

I can only presume paxolin is well suited to the job since it is called for in the plans in preference to any other material. I`ll see how I get on with the Tufnol now I have ordered it - to be honest, if I pull this off and it keeps to a few minutes a day I`d be chuffed :D :drool:

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