Pardon me, I am a complete novice - custom front hubs
Pardon me, I am a complete novice - custom front hubs
(OP)
I am having machined some custom front hubs
basically to suit a 1975 vw van, so single row taper bearings.
now these are steel, what I am having made are in alloy
they are replicating a porsche stud pattern, the porshe hubs they are replicating are cast alloy
my concerns are, which grade material should i use
the other concern being, they are having studs pressed in as the standard ones, I wanted them in steel, but the machinist and I know its easier to do them ally.
also whilst I am on
-the max diameter on the finished item is bob on 150mm
-the machinist says he is to charge me for the next size up, as he has to true the billet, is this correct?
basically to suit a 1975 vw van, so single row taper bearings.
now these are steel, what I am having made are in alloy
they are replicating a porsche stud pattern, the porshe hubs they are replicating are cast alloy
my concerns are, which grade material should i use
the other concern being, they are having studs pressed in as the standard ones, I wanted them in steel, but the machinist and I know its easier to do them ally.
also whilst I am on
-the max diameter on the finished item is bob on 150mm
-the machinist says he is to charge me for the next size up, as he has to true the billet, is this correct?





RE: Pardon me, I am a complete novice - custom front hubs
RE: Pardon me, I am a complete novice - custom front hubs
-Kyle
Kyle Chandler
www.chiefengineering.net
"To the Pessimist, the glass is half-empty. To the Optimist, the glass is half-full. To the Engineer, the glass is twice as large as it needs to be!"
RE: Pardon me, I am a complete novice - custom front hubs
That's why we use hub units not two seperate bearings in alloy spindles.
So far as material goes, it will need to be a high strength alloy with excellent properties. I expect you'll use 6061 T6, that may not be the best choice but I am not going to make a recommendation as it is a safety critical part and you are not designing it properly. Have you wondered why so few cars have had aluminium spindles in the past?
Pressing steel studs into aluminium is rather difficult. I'd do a lot of practice runs first to set the required fits etc. I doubt you will get aluminium wheel studs to live.
Cheers
Greg Locock
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RE: Pardon me, I am a complete novice - custom front hubs
Mike Halloran
Pembroke Pines, FL, USA
RE: Pardon me, I am a complete novice - custom front hubs
I don't know anything but the people that do.
RE: Pardon me, I am a complete novice - custom front hubs
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Pardon me, I am a complete novice - custom front hubs
Summer Brothers also made a disk brake conversion for off rod buggies using VW type front suspension. These had aluminium hubs of rather substantial dimensions. They served us well on an off road racing buggy.
Regards
eng-tips, by professional engineers for professional engineers
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RE: Pardon me, I am a complete novice - custom front hubs
With roller or ball bearings installed as a preset cartridge, extra initial interference would create extra interference (negative clearance). BSA, Norton, and Triumph motorcycles with all or half aluminum connecting rod plain bearing big ends tread a narrow line avoiding going into negative clearance at low starting temperatures.
My Checkoslvakian 2-smoke dirt bike has steel inserts cast in the cases for the ball main and transmission bearings, just like the FAG bearing design book says it should.
RE: Pardon me, I am a complete novice - custom front hubs
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there they are
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so i have stock roll sentres, ackerman
basically stock geometry
-my only real concern is fissure strength - if thats what the term is?
do i just have them made in steel?
-the machinist won't do them in steel - i don't know why?
-maybe you can explain.
If anyone in the world, would like me to post one to you, so you can copy it, in steel, i will be happy
-but then what grade steel?
RE: Pardon me, I am a complete novice - custom front hubs
If you do need them in steel, just find another machinist, They are not exactly a rare commodity.
Regards
Pat
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RE: Pardon me, I am a complete novice - custom front hubs
DO I GET THEN MADE IN
8.8
10.9
12.9
-OR A STRONGER GRADE OF ALUMINIUM
-I WANT IT DONE CORRECTLY
-THEY WILL BE ON A 1.5 TON VAN
I.E. IDEALLY HOLDING UP A 100 RATED TYRE
-I JUST WANT THEM CORRECT - TO GRADE, INDUSTRY STANDARDS
-I KNOW I NEED AT LEASE 10.9 FOR CALIPER BOLT STRENGTH
-
RE: Pardon me, I am a complete novice - custom front hubs
medium grade
-machined
then case hardened?
RE: Pardon me, I am a complete novice - custom front hubs
Can someone point me to more details about these units. I am looking at designing an aluminum hub but I am worried about the wheel bearings and expansion. Any help greatly appreciated.
Thanks
RE: Pardon me, I am a complete novice - custom front hubs
Why don't you start your own thread instead of hijacking this one. That way you can also give it an appropriate heading
Regards
Pat
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RE: Pardon me, I am a complete novice - custom front hubs
h
should get you going
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.