Thread: Philips N4450
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Old 9th Aug 2017, 8:36 am   #39
TonyDuell
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Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,190
Default Re: Philips N4450

No harm done

I've now got the clock/timer stripped on the bench. It needs a good clean-up. It's quite clever, the setting wheels for start and stop each carry a spring-loaded pin contact which makes contact with a flush metal stud on the time wheel in the middle, thus completing the circuit at the right time. The motor feeds a 2-stage worm-and wheel reduction system, that drives the minute time drum. Every revolution of that operates a linkage which steps the hour drum on one position.

It's easy to remove the motor and the fixed spring contacts. Not too hard to get the shafts of drums out. And a right pain to dismantle the reduction gearing.
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