Smiths Thriller Clock Restore: Hour Wheel Manufacture


Usually in clocks in the event you want a brand new half, it must be made. It’s a lot rarer in a clock, nevertheless, that these elements are barely bigger than these in a watch. I used to be given a Smiths thriller clock which had a broken hour wheel and had sat on the shelf in one other workshop with none work being executed for a while. Time to carry this fascinating object again to life!

On a posh part reminiscent of this, I’ll at all times make a mannequin and drawings first. There’s quite a bit to get mistaken so it’s necessary to have a really clear drawing to comply with. Having this printed and hung up on the workshop wall makes checking vital dimensions simple as a reference is at all times at hand.

Clock Wheel Chopping

The primary operation is to chop the tooth; this wheel has 40 tooth and is simply 6.8mm in diameter, which makes it extremely difficult to make. As wheels get smaller, the extent of accuracy required will increase exponentially. Contemplate a clock nice wheel – if the tooth are lower 0.1mm off centre this shall be arduous to see and can make little or no distinction to its operate. On a wheel this measurement, nevertheless, 0.1mm will imply the tooth are noticeably at an angle and could have a big impact. Guaranteeing the cutter is accurately positioned and lined up takes nearly so long as truly reducing the tooth. As you’ll see under I elected to chop an extended size of bar, so I’ve bought the power to make extra of those wheels in future or had spare if a mistake was made later within the course of.




It’s a curious mechanism and actually fairly an fascinating concept – spherical thriller clocks can fairly simply be labored out with simply glass wheels, however sq. ones clearly can’t do this. This motion rocks a glass again and ahead and makes use of a tiny ratchet system to maneuver the arms spherical, as you’ll be able to see within the video under.