Thursday, 19 April 2012

Further progress in the replacement of worn pinions and bushes.....

Geoff Mitchell is continuing to make progress with the replacement pinions and bushes.

Because we are integrating new components with original ones (so far as we are able to judge), we have to be absolutely certain that we have designed and fitted them as accurately as possible. The pinions in particular have a very difficult job to do - namely to mesh effectively with teeth that are substantially and eccentrically worn . If we don't get these details right, further wear will inevitably result. We have to assume this will be our last opportunity to take this approach because further wear will render the original wheels inoperable. At that point the clock will cease to run without either aggressive interventive work on the medieval wheels, or their replacement.

The new release wheel pinion, with reversible mount

The new countwheel pinion

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