![]() To clean things up a little, we can get rid of a lot of 2's: We can't play with the first two because the escapement Here is another way to look at tooth selection: You added another set of gears or idler to reverse it back. Just realize that this causes an extra reversal of the wheels.Ī second hand on the escapement would go CCW unless If you put the minute wheel off to the side of the drive train, Used at the last stage of a fly where friction is a good thing. Practical pinions need to be 6 or 8 to carry loads. Just keep in mind that some ratios just can't be made with an integer Wheel to work with the 8 toothed pinion and 60 toothed wheel. Though, to have a secondary plate or cock to allow the 68 toothed To ensure you don't have to saw through and arbor. ![]() In general, it is best to make smaller wheels towards the escapement An arbor with a wheel of 68 teethĪnd a pinion of 8 teeth is not practical to be used with a wheel of 60 Ratios and what end beat you get with each. In the spread sheet, you might want to show different combinations of Spread sheet to determine what ratios you might want. So, ratio and clearance are two factors that you can use in your spread Teeth would be on the middle of the other arbor. Wheel of 68 teeth would be too large to work because the tips of the As an example: if you had a 8 tooth and a 60 tooth, the radialĭistance between arbors would be proportional to 8+60. That you can't make a wheel hit an arbor if the gears are all at the same If you know the desired total ratio, you can look at the possibleįor this, it would be best to setup a spread sheet. To know what ratios might work, you need to calculate the In your example 2*(30/8)*(60/8)*64 is the ratio to the minute shaft.ģ600 is the end number. To calculate the ratio, if it is towards the pendulum, you multiply. Since it isn't much load, a 5 tooth pinion could be used with aĮach beat on the escapement wheel counts for 2 beats ( once each way ) If on the same shaft you couldĭo the 12:1 as a single gear and then a 1:1 back to the hour. Of the gears will need to be different to make the ratios work. Going from the minute to the hour is a pain because the pitch You have to decide if you want the hands to rotate the same You'll need a ratio of 60:1 to the minute hand. Hand on the escapement wheel, you'll need a 30 tooth escapement. If you have a 1 second beat pendulum and you want a second It is as you think, matching the pendulum to the hands is What source do you want to power it? How many turns will it If you want to fit it into a case, you need to think about the pendulum There are several places you want to think about it. When deciding on the teeth counts, what exactly are you looking for and how would you work backwards from the clock I have described to show “it works” I guess I`m missing the period of the pendulum (double pendulum on this clock) controlling the escape wheel and I should be working back that way? I have done calculations based on the ratio of gearing and can calculate that the drive arbour turns one rev for 195 revs of the escape wheel….but this doesn`t show me anything! I could explain what I understand and what I don`t, but I think an example is best.Ĭlearly this gear ration works as it is a running clock! What I can`t see is why and in all honesty, what is trying to be achieved other than a full rotation of the minute wheel once per minute! Please read through my previous threads before asking me to do my own research – I think it will be clear that I read an aweful lot, but I still do not understand how to calculate teeth numbers and ratios! I am quite happy calculating the wheel size and tooth shape given the number of teeth required, but not calculating the number of teeth required for gear ratios. Over the years I have tried to understand the complexity of gear trains, but I am despirate to now make my own clock from my own plans and so gear trains are something I will need to have crystal clear in my mind. Dear all, I have been a member of NAWCC for many years and have now built a few clocks from scratch but always from plans.
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