nine fingers
3rd October 2009, 08:18 PM
A spring from an old clock is the drive for this wooden geared clock.
The largest wheel is 112mm diam with a diametral pitch of 15. Wheels were machined from Qld white beech, Lignum Vitae was used sparingly for bushes, arbor pivots ,timing wheel teeth (which is only 85 mm diam) and the escapement pallets.
The spring drive wheel has 64 teeth ,turning a 20 tooth gear on the main arbor,which gives a running time of 35 hours approx.
The small pinions (8 tooth ) were impossible to cut out of timber as they were only 16.8 mm diam o/a with a 9.5 mm arbor ,leaving nothing for the teeth. The only other option was a lantern type pinion with 2mm brass tube for the teeth which overcome this problem.
As this is a one off clock, what do I call it? it is 1300mm tall.
At my age things like this keep the mind active. nine fingers.
The largest wheel is 112mm diam with a diametral pitch of 15. Wheels were machined from Qld white beech, Lignum Vitae was used sparingly for bushes, arbor pivots ,timing wheel teeth (which is only 85 mm diam) and the escapement pallets.
The spring drive wheel has 64 teeth ,turning a 20 tooth gear on the main arbor,which gives a running time of 35 hours approx.
The small pinions (8 tooth ) were impossible to cut out of timber as they were only 16.8 mm diam o/a with a 9.5 mm arbor ,leaving nothing for the teeth. The only other option was a lantern type pinion with 2mm brass tube for the teeth which overcome this problem.
As this is a one off clock, what do I call it? it is 1300mm tall.
At my age things like this keep the mind active. nine fingers.