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TOPIC: twisting lay length using gears

twisting lay length using gears 2 months 2 weeks ago #143

  • acechpr
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Hi, I'm trying to find a formula to determin a certain lay on a twisting machine.
let me give you an example:
gear A = the speed of the bow in rpm of the bow
gear B = the capstan pull speed
so right now i have 58 gear on A shaft and 70 gear on B
shaft which gives me an aprox. of a .875 inch lay and im looking for the fumula that will determin different lays I need to run cable.
I have over 100 sets of gears
Last Edit: 2 months 2 weeks ago by acechpr.
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twisting lay length using gears 2 months 2 weeks ago #144

  • Graham
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I don't know anything about twisting machines and the application but given the ration of the two gears you provide in the example
gear A (58 teeth) will make .828 of a turn for each turn of gear B (70 teeth) being 58/70. This ratio is close to the approximate .875 it produced. Without additional information I would assume gears of equal teeth, say A = 50 and B = 50 would produce a 1" lay. If that is the case the formula would be A/B

Graham
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twisting lay length using gears 2 months 2 weeks ago #145

  • ken rector
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I'm curious about what is a twisting machine, and who you are? Can you tell us more about your machine, what you twist, and what you mean by run cable?
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twisting lay length using gears 2 months 2 weeks ago #146

  • acechpr
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no graham you would think that but that is wrong the 1" gears are 62 for A and 65 for B
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twisting lay length using gears 2 months 2 weeks ago #147

  • acechpr
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Hi ken a twisting machine is used for twisting 2 seperate wires together to make a electrical cable like you see in a twited pair in a usb cale and i am an employee of a wire company and i am designing a mini twisting machine and am looking for a way to run it by gears
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twisting lay length using gears 2 months 2 weeks ago #148

  • Graham
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With that additional info, it looks like the required gear ratio is about 95% of the desired twist.
58/70 = .828 produces .875 .828/,875 = .946 or 94.6%
62/65 = .954 produces 1.0 .954/1 = 95.4%
If that holds up then the formula would be
A/B ratio = desired twist * .95
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