Rear hub bearings - fresh thinking or already been done?

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Re: Rear hub bearings - fresh thinking or already been done?

Postby Winchweight » 03 Jul 2017, 15:38

:ok Like it! :ok
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Re: Rear hub bearings - fresh thinking or already been done?

Postby irishkeet » 04 Jul 2017, 06:30

great work silverbullet :mrgreen:
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Re: Rear hub bearings - fresh thinking or already been done?

Postby syncropatrick » 04 Jul 2017, 08:03

silverbullet wrote:16" will be priced lower than 14"

That is the first time I've ever heard that phrase. Welcome news indeed!
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Re: Rear hub bearings - fresh thinking or already been done?

Postby silverbullet » 05 Jul 2017, 20:00

Someone has to cut you poor fools some slack!

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Re: Rear hub bearings - fresh thinking or already been done?

Postby bigbadbob76 » 06 Jul 2017, 11:13

silverbullet wrote:My reference 14" housing doesnt look too bad, but it is almost 0.003" out of round.


I have a spare pair of 2wd housings I intend to use, could you advise how much out of round is acceptable and what the housing inner diameters should be for a proper bearing fit?
Also... am I right in thinking the ovaling is caused by pounding forces from the suspension rather than rotational wear?
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Re: Rear hub bearings - fresh thinking or already been done?

Postby silverbullet » 21 Jul 2017, 18:44

They should be perfectly round of course but none will be by now. Onve the bores ovalize, the bearings will start to creep and eventually spin in the housing.
The inner ball bearing usually does this, the outer tends to ovalize (it carries most of the load, being a roller bearing)
I would rather not comment on fit, since we will testing these new parts fairly soon.

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Re: Rear hub bearings - fresh thinking or already been done?

Postby silverbullet » 21 Jul 2017, 18:54

More progress, tantalizingly close now...
Fillet radius machined on with new tooling, alloy tooling plate fixture made to achieve negative camber angle.
Bores "just" need sizing and then the angle/mating face goes on the back (a little more CNC) and they get spotfaced for the M14 bolts. ImageImageImageImageImageImageImage

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Re: Rear hub bearings - fresh thinking or already been done?

Postby scaltura » 22 Jul 2017, 08:28

beautiful that is :ok
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Re: Rear hub bearings - fresh thinking or already been done?

Postby bigbadbob76 » 31 Jul 2017, 15:39

Thanks for your reply Silverbullet.
Fully understand. :-)
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Re: Rear hub bearings - fresh thinking or already been done?

Postby djswain1 » 01 Aug 2017, 19:36

silverbullet wrote:Lots of programming and some initial optimisation today, trying to get the cycle times down to make them affordable :))
There is a lot of metal to come off these...currently over 40mins to mill that circular boss but it is 200mm diameter coming down to 84mm and 35mm long.
I can't cut the lug contour until I have tool holder long enough, 10mm shy at the moment which would make a mess of things! Should have one here Weds.ImageImageImage

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Could you save time by turning the circular boss on a lathe rather than milling it?

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Re: Rear hub bearings - fresh thinking or already been done?

Postby Jim San » 01 Aug 2017, 19:43

This is looking sexier than a sexy thing
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Re: Rear hub bearings - fresh thinking or already been done?

Postby garyd » 16 Aug 2017, 11:03

[quote="silverbullet"]Image[quote]

Ian, with reference to your statement about the huge amount of machining needed to remove all the unnecessary metal from the blank, is it possible to begin by cutting/sawing rectangular blocks off? A vertical cut followed by a horizontal one each side of the 'tube' in the photo above could go nearly right down to the fixing flange. Follow this with two smaller blocks cut off from above the brake backplate fixing 'arms' would leave a lot less metal to reduced to shavings.

Is that a possible way to reduce machine time?
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