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Old 15th Sep 2020, 1:30 pm   #12
Mike Phelan
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Join Date: Nov 2003
Location: Near Leeds, West Yorkshire, UK
Posts: 4,405
Default Re: Pulsynetic master clock: question about gravity arm roller.

Hi there again,

I've just had a close look at mine now - answers / comments below:

Quote:
Originally Posted by KesterLester View Post
The only immediate question-mark I have after inspecting it concerns the roller on the gravity arm.

It looks to me like the roller brushes against the upper apex of the pusher ramp on each swing. It's not a strong contact, but there is a little play in the roller's mount, and the contact is enough to lift the roller slightly and reliably rotate it a little left or right, etc. Because of the slight play in the roller mount this just looks "wrong" to me. It "feels" to me like it should be 'just' clear of the apex at all times and only come into contact with the pendulum pusher when released.

Is that indeed the case?
Until the release, the roller should be about 2 mm away from the ramp on the pendulum (X).
This setting is adjusted with the two screws on the vertical bar.
Quote:
About 2 mm.
And is it normal to have a small amount of play (wobble) in the bearing of the roller?
Quote:
It doesn't matter too much unless really excessive.
The roller moves about 1 mm front to back on mine.
Others have filled in some of the relevant details, but I'll leave the post on.
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Mike.

Last edited by Mike Phelan; 15th Sep 2020 at 1:38 pm.
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