By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

aluminium

timing gears

All Topics | Latest Posts

Search for:  in Thread Title in  
peter warner23/04/2014 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 C24/04/2014 12:36:11
avatar
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

JasonB24/04/2014 13:15:39
avatar
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 hawes24/04/2014 17:11:05
570 forum posts
18 photos

The 1000cc Vincent motorbike uses an aluminium timing gear (idler). Colin

peter warner24/04/2014 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 Gilligan24/04/2014 20:56:29
avatar
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

JasonB25/04/2014 07:23:50
avatar
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 Gilligan25/04/2014 07:44:36
avatar
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 warner25/04/2014 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 Curve25/04/2014 14:39:35
avatar
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 Stevens25/04/2014 16:10:32
avatar
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 warner26/04/2014 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?

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

 

Donate

donate