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Thread: Helical gear maker?
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25th May 2021, 11:11 PM #31Most Valued Member
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Nice looking bike, what year is it??
KrynTo grow old is mandatory, growing up is optional.
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25th May 2021, 11:12 PM #32Mechanical Butcher
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Another photo shows the more usual type of brake, which has one lever on the brake plate.
Mine has two levers with a linking rod, which is an obstruction that requires the speedo cable to exit at a greater angle.
That needs to have the different helix angle on the driven gear.
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25th May 2021, 11:14 PM #33Mechanical Butcher
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25th May 2021, 11:22 PM #34Mechanical Butcher
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25th May 2021, 11:34 PM #35Mechanical Butcher
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It's a 350, almost identical to look at.
I used to think the Ducati 50cc pullrod 4 stroke bicycle motor was the ultimate of its type, until I learnt about the Bugatti effort.
It has twin overhead camshafts and is supercharged, about 10cc.
the Bugatti revue, 12-1, Bugatti T72 fact sheet and photos
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26th May 2021, 12:30 AM #36Golden Member
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If you are not a genius on CAD I am sure there are some smart cookies on this site who could draw it up. There will almost certainly be some locals who can nylon print. I would try my 3D printer for you but so far I have not managed to get decent and accurate enough prints yet.
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26th May 2021, 07:32 AM #37Philomath in training
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Gears when used as skew gears rub a bit - not sure a 3D printed one would last long. The helix angle is the critical bit. Once we know that, the maths can leap into effect and it will probably work out.
Michael
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26th May 2021, 08:35 AM #38Diamond Member
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26th May 2021, 10:24 AM #39Most Valued Member
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26th May 2021, 11:21 AM #40Golden Member
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Nad, I have just done a quick google for "speedometer nylon gear" and there are plenty of cheap alternatives. If I was you I would be working out the overall gear ratio you need then finding a pair of gears pre-made - it them doesn't matter what the MOD or helical angle is just as long as the 2 match each other. You might need to modify them slightly to fit your shafts.
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26th May 2021, 11:26 AM #41Gear expert in training
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Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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26th May 2021, 11:34 AM #42Diamond Member
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Toyota G52 etc series gearbox. Right angle speedo drive out of the side of the box, nylon gear is 23.5 OD x 14 long.
IMG_3971.jpg
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26th May 2021, 12:00 PM #43Most Valued Member
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I think all of the cars that i worked on in the 70's & 80's had a plastic gear on the mainshaft and a plastic gear on the speedo cable, the gears in on the speedo cable were color coded and slightly differant diameters, i was a mechanic in the police workshops and we would drive a car over a measured kilometer and take note of the odometer reading and then fit the right coloured gear to get the odometer calibrated to the spec it needed to be.
Then the speedo/needle spring would be adjusted/calibrated by using a machine that drove the speedo, the machine had a calibrated speedo and you used that to set the other.
I dont recall ever seeing a plastic gear on any motorcycle that i have worked on
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26th May 2021, 12:54 PM #44Golden Member
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26th May 2021, 01:02 PM #45Mechanical Butcher
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