Clock this!!

[vivandorron]

I have what I would describe as a long case, wall mounted, wind-up, pendulum clock. It's not an antique item but a reproduction piece which was bought about 45yrs ago.

My question is:- Why does a 31day mechanism clock still keep relatively perfect time (about a minute deficit per month) but now stops and has to be re-wound after 10/14 days.?

A similar problem has also developed with a 7day carriage clock which now requires re-winding after 3/4days.

[ChuckFickens]

take them both to a proper person that deals with clocks (they must have a name??) and they will clean the mechanism and lubricate anything that needs it with the correct oils.

[vivandorron]

Hi there ChuckFickens. ...I respect your advice but I don't think it's an oiling job. I think it has something to do with spring tension. Incidentally, your calculation for ring main circuitry of 7.2 was spot on....Good on yer...Ron

[Buenchico]

It's metal fatigue.

If you repeatedly bend and unbend a strip of metal it gradually loses bending strength (i.e. it starts to 'go floppy'). Repeatedly winding the clock's spring, and allowing it to unwind, has made it 'floppier' than it used to be. So it's now easier to wind the clock than it used to be.

Since less energy is required to wind it up, the spring stores less energy. The regulator mechanism ensures that the energy is still used at the same rate as before but, since there's less energy to start with, it runs out faster.

Chris

[vivandorron]

Good evening Chris...It's been a little while since we've been in contact. I think you've hit the nail upon the head or should I say you've sprung into action with the answer for which I am looking. The pendulum is certainly swinging in your favour.....Ron

[sddsddean]

As chuck (almost) says, ask the advice of your local horologist (thats clock person to you and me!)