Lantern Pinion

[bernard towersParticipant @bernardtowers37738]

Be careful Alan the AHS could be digging your grave as we speak!!!!

[Dick H]

On Dick H

….Clock makers make gears and pinions to exacting specifications and in the end use a depthing tool to get it right! …..

DickH

 

If they made the gears to an accurate size and had the kit to drill thd bearings at an accurate distance they wouldn’t need a depthing tool. For the slave clock I made I used commercial gears and spaced the holes using dials on milling machine, worked well

[Martin KyteParticipant @martinkyte99762]

So the question you have to answer is do gears running at the exact theoretical centres have the lowest friction and are guaranteed free from wedging especially when wheels are driving pinions.?

[John HaineParticipant @johnhaine32865]

It depends on what you mean by theoretical centres I think.  For the slave clock movement I made I profiled out the pinions and wheels on the CNC from the dxf designs generated by the “cycloidal gear builder” site.  These are to a recognised standard for horological gears (BS I think) and have an allowance for backlash built in.  They meshed perfectly at the theoretical centres for the modules used, the plates also being coordinate drilled by the CNC.  Whether they have the lowest friction etc I don’t know, but at least designing and manufacturing to a standard means there is some objective control over the process rather than relying on the clockmaker’s feel.

[Author]

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