miken
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Post by miken on Nov 4, 2023 16:53:58 GMT
I have been asked to renovate our club battery electric locomotive.
It has 4 electric motors.
Each motor has a small steel pinion driving an 80t spur gear which is made from a hard white plastic.
One of the plastic gears has failed and the others appear slightly worn after approx 5 seasons in service.
I have found that I can buy 1 mod x 80t gears off the shelf in the following materials:-
a). Steel,
b). Delrin,
c). Nylon 6 + 30% glass
d). Hostaform C.
Any thoughts on what would be the most suitable choice for this application.
Would brass be a good option if I can find them?
Thanks Mike
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millman
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Post by millman on Nov 4, 2023 17:54:12 GMT
I think I would go for A or C. Brass should be OK but might be the most expensive.
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Post by ettingtonliam on Nov 4, 2023 19:44:25 GMT
You might find steel on steel a bit noisy.
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Post by Jim Woods on Nov 6, 2023 10:07:26 GMT
As an apprentice, I use to make "Tufnol" gears for a ropewalk that was still in every day use here. Steel on this fiber reinforced material was very quiet and lasted quite a while in heavy usage.
Jim
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millman
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Post by millman on Nov 6, 2023 13:54:44 GMT
I agree with you Jim, Tufnol would run quietly against steel but you need the right grade and they should be cut out of sheet rather than bar, if made from bar the teeth have a habit of shearing off as I am sure you know.
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miken
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Post by miken on Nov 6, 2023 20:24:57 GMT
I agree with you Jim, Tufnol would run quietly against steel but you need the right grade and they should be cut out of sheet rather than bar, if made from bar the teeth have a habit of shearing off as I am sure you know. I don't want to get involved in making gears. But I don't mind adapting off the shelf items. |
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Post by Jim Woods on Nov 8, 2023 19:37:54 GMT
Hi Millman, yes, sheet is best. the stuff we used was inch thick I think (was 40 years ago!!!) you need to have good dust extraction too. Still use it today for high temp induction coil mounts. we use it to wrap square section 1/4 copper tube around. Turn a sort of cotton reel then layer down coils of the copper. each layer is glued with hi temp resin. we use the tube so we can watercool the coil when the hi volts and amps are past through. awful messy job on the lathe. the stuff is now known as Micarta. all different grades and reinforcing materials too. lep.co.nz/shop/industrial-plastics-rod-sheet-tube/sheets/micarta-sheets/usual disclaimers :-) |
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