Printable Version | Subscribe | Add to Favourites
<<  1    2    3    4    5    6  >>
New Topic New Poll New Reply
Author: Subject: Cortina Alloy Hubs, Any Wanted ???Prices now finalised!!
britishtrident

posted on 14/3/05 at 08:28 AM Reply With Quote
quote:
Originally posted by gazza285
I know shot peaning is used to reduce stress raisers but to toughen alloy surfaces, that's a new one on me.


Bead blasting rather than shot on alumium I wiuld expect Same thing really it should introducescompressive residual stress and gets rid of tensile by physically impacting the surface -- as aluminium work hardens it must harden the surface layers in the process.

[Edited on 14/3/05 by britishtrident]

View User's Profile View All Posts By User U2U Member
Deckman001

posted on 17/3/05 at 02:21 PM Reply With Quote
Chaps, might be able to get a deal on the Bearings if i can get enough interest , can also get the cnc shop to fit them as well at a cost, havn't found that bit out yet though as i was after peoples thoughts on me getting the whole package first

Jason

Eek,lasses as welll,,, sorry

[Edited on 17/3/05 by Deckman001]

View User's Profile View All Posts By User U2U Member
ned

posted on 17/3/05 at 02:31 PM Reply With Quote
well, i've only just put new bearings in the iron hubs, but the last lot were a bitch to get out i think (it was so long ago now) how much extra would it be?

Ned.





beware, I've got yellow skin

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
Deckman001

posted on 17/3/05 at 02:50 PM Reply With Quote
Won't know till i get an idea of how many to order, if it's 50 bearings kits then it will be under £10 each plus fitting, which i don't have a cost for

Jason
eek, bearing price has gone up to £12.50

[Edited on 22/3/06 by Deckman001]

View User's Profile View All Posts By User U2U Member
MikeR

posted on 17/3/05 at 02:57 PM Reply With Quote
i think its the fitting cost that i'm most curious about. Darrens web site lists them at 15.50 each so any figure less than that is a bargin (unless you've already got your bearings like me!)
View User's Profile View All Posts By User U2U Member
Deckman001

posted on 17/3/05 at 03:01 PM Reply With Quote
I'll get a set next time i pass the place and when the first set are ready, I'll get them to fit em and then get a definate cost for each hub


Jason

View User's Profile View All Posts By User U2U Member
ned

posted on 17/3/05 at 03:05 PM Reply With Quote
Jason,

when the first set is done can you get an approx weight? i know it makes little difference as they'll be shed loads lighter anyway but i saw a set the other day that were slotted between the wheel stud holes to lose even more weight. may have been the racedla ones..

Ned.





beware, I've got yellow skin

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
Deckman001

posted on 17/3/05 at 03:10 PM Reply With Quote
Yep, will do

Jason

View User's Profile View All Posts By User U2U Member
robby

posted on 17/3/05 at 04:19 PM Reply With Quote
definite for me too, if they're still there! cheers!
View User's Profile View All Posts By User U2U Member
Deckman001

posted on 17/3/05 at 04:22 PM Reply With Quote
robby, you have been added

Jason

View User's Profile View All Posts By User U2U Member
robby

posted on 18/3/05 at 12:10 PM Reply With Quote
cheers man!
View User's Profile View All Posts By User U2U Member
jcduroc

posted on 30/3/05 at 02:59 PM Reply With Quote
quote:
Originally posted by NS Dev
It's nothing to worry about, no need for peening etc, as long as the fit is tighter than that used on a steel housing, that's all, ...

How tight a fit, I mean, in terms of tolerances?





JCM

View User's Profile View All Posts By User U2U Member
cymtriks

posted on 30/3/05 at 09:03 PM Reply With Quote
Fitting bearings...

quote:
Originally posted by James
quote:
Originally posted by NS Dev
That sounds right, yes. The alloy will tend to get "hammered" by the bearing outer race as it rotates and then allow the outer race to "walk" around in the hub.

So yes, the race will probably want to be a shrink fit or good press fit.

Haing said that, I havent done it so I don't know!


It would be easy and cheap to get the bearing area of the hub shot peened to toughen it up if it's a worry.

Cheers,
James

[Edited on 11/3/05 by James]


Do not shot peen. This will increase the diameter of the bore which may make the problem worse.

Fit the outer rings with an appropriate fit. If you want to work it out for youself it's easy to do. Just take the difference between the expansion coefficient of the alluminium and of the steel bearing (this difference will be about 11 x 10e-6) and multiply it by the diameter of the bearing OD and by the temperature rise in the hub.

so that's
11 x 10e-6 times OD times temprise

add this to the interference fit on the bearing as fitted to the steel hub (measure a couple of steel hubs with an internal micrometer)

At this point you'll be asking how you get the temperature of the hub?

There are some pointers to this:-
Use thermal paint that changes colour according to the temperature reached.
Splash a little water on a hub that's just done a few miles. No hiss and it's under 100C.
Check for the thermal limits on the grease recommended for the original hub bearings.

So if the hub is at 70C then the rise is about 50C assuming that the bearings and hubs are fitted at 20C.

One important point. If the fit is too high you'll crush the bearing and it will fail early.

Why not investigate which bearings are used on an existing proven design of alloy hub such as an Elise or Westfield hub? I've heard the Elise uses MGF bits in the hubs.

NSdev, you mentioned brinelling and you live in Stroud. Do you work at Aerospace Bearings in Stonehouse by any chance? I used to work there!

View User's Profile View All Posts By User U2U Member
Deckman001

posted on 6/4/05 at 07:38 AM Reply With Quote
Hi peeps, am looking at the Bearings options at the moment, looks like either 'cheap' ones or Timken, can the people on the list on page 4 u2u me their preference , I'm going to need a group buy for these to get a discount to pass on !!
I'm guessing the other option would be to get these Hubs plain, and let you all fit the bearings yourslves,,, your call
Cheers peeps

Jason

View User's Profile View All Posts By User U2U Member
Deckman001

posted on 7/5/05 at 02:11 PM Reply With Quote
The test Hubs are being finnished today and then being fitted with Timken Bearings, I'm picking them up on tuesday ,ready for the testing, I'll post a price on tuesday after i speak to the miller

Jason

View User's Profile View All Posts By User U2U Member
WIMMERA

posted on 8/5/05 at 12:53 AM Reply With Quote
I would be more concerned about the prospect of losing bearing running clearance as the hubs warm up and the distance between the bearing cups increases as the alloy expands, reducing bearing clearance, which generates more heat and so on.

Wimmera

View User's Profile View All Posts By User U2U Member
Deckman001

posted on 8/5/05 at 07:27 AM Reply With Quote
I would be too , if it wasn't for the fact that Cater*** sell them ,Westf**** sell them and so do lots of other companies, also the company that are making mine are ISO certified and also make components for the aero industry

Jason

View User's Profile View All Posts By User U2U Member
WIMMERA

posted on 8/5/05 at 11:51 AM Reply With Quote
What maximum temperature did you specify to the manufacturer.

Wimmera

View User's Profile View All Posts By User U2U Member
Deckman001

posted on 8/5/05 at 12:12 PM Reply With Quote
I gave them the spec for Gp4 rally hubs which includes a heat treatment, they said it was a med quality material spec , aviation spec being the best, I'm keeping to the GP4 spec as these cars won't be used with the same loading forces as used by production cars (hopefully)so should last a long time in normal use
Only testing will prove this so it's off to the tester on tuesday Allthough i do have a ex F1 engineer interested in seeing them as well
Time wil tell i guess
ATB
Jason

View User's Profile View All Posts By User U2U Member
Deckman001

posted on 9/5/05 at 07:15 PM Reply With Quote
For Ned's information, and other's i guess,, The weight of the bare hub is 1.08kg

Jason

View User's Profile View All Posts By User U2U Member
Northy

posted on 9/5/05 at 07:19 PM Reply With Quote
pictures?!





Graham


Website under construction. Help greatfully received as I don't really know what I'm doing!


"If a man says something in the woods and there are no women there, is he still wrong?"

Built 2L 8 Valve Vx Powered Avon

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
Deckman001

posted on 9/5/05 at 07:30 PM Reply With Quote
Tomorrow, after i get to see them !!
apparently they do look smart !!

Jason

View User's Profile View All Posts By User U2U Member
NS Dev

posted on 10/5/05 at 07:38 AM Reply With Quote
quote:
Originally posted by cymtriks
quote:
Originally posted by James
quote:
Originally posted by NS Dev
That sounds right, yes. The alloy will tend to get "hammered" by the bearing outer race as it rotates and then allow the outer race to "walk" around in the hub.

So yes, the race will probably want to be a shrink fit or good press fit.

Haing said that, I havent done it so I don't know!


It would be easy and cheap to get the bearing area of the hub shot peened to toughen it up if it's a worry.

Cheers,
James

[Edited on 11/3/05 by James]


Do not shot peen. This will increase the diameter of the bore which may make the problem worse.

Fit the outer rings with an appropriate fit. If you want to work it out for youself it's easy to do. Just take the difference between the expansion coefficient of the alluminium and of the steel bearing (this difference will be about 11 x 10e-6) and multiply it by the diameter of the bearing OD and by the temperature rise in the hub.

so that's
11 x 10e-6 times OD times temprise

add this to the interference fit on the bearing as fitted to the steel hub (measure a couple of steel hubs with an internal micrometer)

At this point you'll be asking how you get the temperature of the hub?

There are some pointers to this:-
Use thermal paint that changes colour according to the temperature reached.
Splash a little water on a hub that's just done a few miles. No hiss and it's under 100C.
Check for the thermal limits on the grease recommended for the original hub bearings.

So if the hub is at 70C then the rise is about 50C assuming that the bearings and hubs are fitted at 20C.

One important point. If the fit is too high you'll crush the bearing and it will fail early.

Why not investigate which bearings are used on an existing proven design of alloy hub such as an Elise or Westfield hub? I've heard the Elise uses MGF bits in the hubs.

NSdev, you mentioned brinelling and you live in Stroud. Do you work at Aerospace Bearings in Stonehouse by any chance? I used to work there!


Crikey, quotes on quotes on quotes!

No, it wasn't me that mentioned the brinelling, although I do have a bit to do with bearings, as I work for Timken! Not in the bearing division, but in the Alloy Steel division, as a process improvement engineer in a tube piercing mill, formerly TI Tubes Desford Ltd.

View User's Profile Visit User's Homepage View All Posts By User U2U Member
Kissy

posted on 10/5/05 at 12:21 PM Reply With Quote
Ready with the readies!
I'll take 'em as they come, would prefer
1. Timken
2. Bare
3. Cheapies

Like I said, if you need some dosh to get rolling I'd be happy to stump up in advance.

What are the chances of anodising? I'm aware this may change dims.
Cheers.

View User's Profile E-Mail User View All Posts By User U2U Member
Deckman001

posted on 10/5/05 at 06:44 PM Reply With Quote
The bearings are Very hard to fit without the use of a press, so i am going to advise that i supply the hubs with the bearings fitted, the test hubs do have Timken, so i will try again to get a price on the bulk buying of them so as to be able to pass on the cost saving.

The cost of each Hub will be £47.50 EACH + bearing, i will advise people of the cost of these as soon as i get a reply from the supplier
I hope this makes things a bit clearer
I will be placing the order in about a months time and delivery will be soon after that, I can also order as many extra as i need if your orders are placed to me before i give the final order to the supplier, No money will be required until i get a delivery date from the supplier, so you can all keep your money earning interest on your bank accounts

Pictures will follow as soon as i get my proper comp back to life, this laptop won't reduce the pic size sorry

ATB
Jason

[Edited on 16/3/06 by Deckman001]

View User's Profile View All Posts By User U2U Member
<<  1    2    3    4    5    6  >>
New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.