Recent content by Davieravie80

That is the escape wheel (I've taken the fly off) in the photo that the pulley is fitted to with the next wheel in the sequence of the train. It goes through another wheel then through the winding barrel and finally out to the centre wheel which drives the 4 dials.

Correct, that is a Crouzet synchronous motor in the pic, with 2 20 tooth pulleys which we fitted and tested but the clock was running slow. Now with the new pulleys the clock will keep perfect time. Lesson learnt, I always double check when counting teeth, looks like I have to triple check now.

Something like this:

I'll take some photos mate, I haven't explained well what's what here. I'm using pulleys, one on a motor and one on the initial shaft (escape wheel) along with a small timing belt to get a constant speed out and drive the hands of a large tower clock. I have done a few using this technique, I...

I'll get some photos up lads sometime soon, I've been changing clocks the last 6 days as its gone into GMT time here in the UK. My mate is a maths teacher at a posh school, I've checked over the figures with him and they are correct. 5rpm motor with a 24 tooth pulley on its shaft driving the...

Thanks billy for your responses, you are correct, I would need a 12 on the motor and a 9 on the shaft. However, I cannot source a 9, the smallest HPC gears have "off the shelf" is 10. I am doubling up the the 12 to a 24 and doubling up the shaft one to 18 keeping the same ratio. Thanks for your...

Thanks for the reply billy j but I recounted the teeth with my dad and the big wheel has 120! I had used dividers to do this for the first time and had back counted the last tooth. Definitely 120. So I had a think, it's 120/9 in 1/2 rpm? So to bring it into revs per min that would be 60/9? So...

Sorry, the 145 should be 125! My brain hurts.

Hello all, first post on here. My fathers friend recently died of cancer and he was the person we used to turn to for this question, I've been racking my brain and searching the net for info, found this link (http://www.schsm.org/html/gear_ratio_calculations.html) and have got the ratio down...