timing gears
peter warner | 23/04/2014 16:14:23 |
17 forum posts | Could anyone advise the most suitable alloy spec to use for timing gears 0n a model aero engine please? |
Ian S C | 24/04/2014 12:36:11 |
![]() 7468 forum posts 230 photos | I might be wrong, but I would think any alloy of aluminium is going to be short lived as a gear, maybe hard anodised, or chromed would be ok, maybe someone else knows better. Ian S C |
JasonB | 24/04/2014 13:15:39 |
![]() 25215 forum posts 3105 photos 1 articles | Unless you have a real weight issue I would go with steel, most of the published designs have steel gears. If you do want to keep the weight down then you can thin out the area between hub and teeth, drill a series of holes or a bit of both. Something along these lines Basic gear Drilled & turned |
colin hawes | 24/04/2014 17:11:05 |
570 forum posts 18 photos | The 1000cc Vincent motorbike uses an aluminium timing gear (idler). Colin |
peter warner | 24/04/2014 18:21:21 |
17 forum posts | Thanks for the response everyone,many years ago Colin I had a Vincent Comet,this had an alloy large idler timing gear,which triggered the question. |
Michael Gilligan | 24/04/2014 20:56:29 |
![]() 23121 forum posts 1360 photos | Peter, Reputedly, the Vincent used RR56 alloy for the large idler. Do a Google search for RR56 and you will find details. MichaelG. . P.S. There was a chap used to write in MPH, who always referred to his son as ET50 Edited By Michael Gilligan on 24/04/2014 21:05:24 |
JasonB | 25/04/2014 07:23:50 |
![]() 25215 forum posts 3105 photos 1 articles | I wonder if the fact it was only the idler that was aluminium was why it was OK as there would be much less risk of the metal picking up like you would expect alloy on alloy?
J |
Michael Gilligan | 25/04/2014 07:44:36 |
![]() 23121 forum posts 1360 photos | Posted by JasonB on 25/04/2014 07:23:50:
I wonder if the fact it was only the idler that was aluminium was why it was OK as there would be much less risk of the metal picking up like you would expect alloy on alloy? J . Very probably ... Also, the lubrication system is very well done. MichaelG. |
peter warner | 25/04/2014 11:33:30 |
17 forum posts | Thanks Michael,Will google that material.Sadly at 83 I have'nt got the balls to ride any more,had avelo Viper until 2 years ago,did'nt get round to restoring it so sold it to a mate.Happy days. |
Involute Curve | 25/04/2014 14:39:35 |
![]() 337 forum posts 107 photos | I make timing gears for Triumph motorbikes and others they seem to run no problem, I also make rear sprockets out of Ali, I use 7075 T6 but I have used 2014 and 6082 the later is readily available but not as good as the others, you could get them hard anodised for longevity if you feel the need.
HTH
Shaun |
Tim Stevens | 25/04/2014 16:10:32 |
![]() 1779 forum posts 1 photos | For the record, the original Vincent idler gear was a bronze casting, and it tended to clatter and clang. The factory 'solution' was to use a forged light-alloy wheel which would expand along with the crankcase. But they still sounded like a dustbin being dragged across cobbles. I had one. The rest of the train (crank input & camshafts) was steel gears. cheers, Tim |
peter warner | 26/04/2014 10:36:30 |
17 forum posts | Thanks for the ali spec involute curve,will try and source some of that.Graham the tufnol sounds good,many of the motor cycle auto advance & retard mag gears were made of this,my main gear on the model is a ring gear so I will need to plane the teeth I guess,not sure if I could do that with tufnol? |
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