Previous Thread
Next Thread
Print Thread
front hub run-out spec #3043819
05/20/22 09:10 AM
05/20/22 09:10 AM
Joined: Dec 2007
Posts: 18,153
Mass
DAYCLONA Offline OP
I Live Here
DAYCLONA  Offline OP
I Live Here

Joined: Dec 2007
Posts: 18,153
Mass
Guys,hopefully looking for an answer, I turned down some custom front hubs out of billet aluminum for a custom disc brake set up, assembled on the spindle I'm getting approx .007 run-out measured at the hubs centric outer center where the wheel's centric bore will align with it, I looked on line, FSM's, etc, etc, maybe I'm overlooking it, but I don't see what an acceptable min/max run-out value is...Thanks for any help/suggestions


MikeG

Re: front hub run-out spec [Re: DAYCLONA] #3043834
05/20/22 09:57 AM
05/20/22 09:57 AM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline
I Live Here
6PakBee  Offline
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
Radial runout or axial runout?


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: front hub run-out spec [Re: DAYCLONA] #3043842
05/20/22 10:13 AM
05/20/22 10:13 AM
Joined: Jan 2003
Posts: 18,389
UPPER MICHIGAN, MARQUETTE COUN...
N
NITROUSN Offline
I Live Here
NITROUSN  Offline
I Live Here
N

Joined: Jan 2003
Posts: 18,389
UPPER MICHIGAN, MARQUETTE COUN...
Mike my 70 FSM on the KH rotors says .0025 on run out. Don't know if that helps.

Re: front hub run-out spec [Re: 6PakBee] #3043935
05/20/22 02:54 PM
05/20/22 02:54 PM
Joined: Dec 2007
Posts: 18,153
Mass
DAYCLONA Offline OP
I Live Here
DAYCLONA  Offline OP
I Live Here

Joined: Dec 2007
Posts: 18,153
Mass
Originally Posted by 6PakBee
Radial runout or axial runout?



Roger it would be radial run out of the hub's centric value....since my post I turned down the factory spindles and installed some press fit IR journal races and machined the new surfaces for .001-.0015 slip fit for the inner/outer tapered bearings, radial run-out of the spindle/hub assy is now approx .003-.0035, which is pretty "tight" IMHO.....just curious what the factory min/max recommendation is...


MikeG

Re: front hub run-out spec [Re: NITROUSN] #3043938
05/20/22 03:00 PM
05/20/22 03:00 PM
Joined: Dec 2007
Posts: 18,153
Mass
DAYCLONA Offline OP
I Live Here
DAYCLONA  Offline OP
I Live Here

Joined: Dec 2007
Posts: 18,153
Mass
Originally Posted by NITROUSN
Mike my 70 FSM on the KH rotors says .0025 on run out. Don't know if that helps.




Thanks Pete, I have a feeling that spec would be an axial measurement however, to check for hi-low spots/warped rotor surface?....unless it specifies radial?


MikeG

Re: front hub run-out spec [Re: DAYCLONA] #3044001
05/20/22 08:32 PM
05/20/22 08:32 PM
Joined: Jan 2003
Posts: 10,667
North Dakota
6PakBee Offline
I Live Here
6PakBee  Offline
I Live Here

Joined: Jan 2003
Posts: 10,667
North Dakota
Originally Posted by DAYCLONA
Originally Posted by 6PakBee
Radial runout or axial runout?



Roger it would be radial run out of the hub's centric value....since my post I turned down the factory spindles and installed some press fit IR journal races and machined the new surfaces for .001-.0015 slip fit for the inner/outer tapered bearings, radial run-out of the spindle/hub assy is now approx .003-.0035, which is pretty "tight" IMHO.....just curious what the factory min/max recommendation is...


MikeG


I assume you are measuring the radial runout on the register for the wheel which is where most of the discussions I read took the measurement. I couldn't find anything definitive. There is a lot of tribal information on the web that seems to agree at 0.003" maximum but again, I can find no "official" specification for radial runout.


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: front hub run-out spec [Re: 6PakBee] #3044032
05/20/22 10:38 PM
05/20/22 10:38 PM
Joined: Dec 2007
Posts: 18,153
Mass
DAYCLONA Offline OP
I Live Here
DAYCLONA  Offline OP
I Live Here

Joined: Dec 2007
Posts: 18,153
Mass
Originally Posted by 6PakBee
Originally Posted by DAYCLONA
Originally Posted by 6PakBee
Radial runout or axial runout?



Roger it would be radial run out of the hub's centric value....since my post I turned down the factory spindles and installed some press fit IR journal races and machined the new surfaces for .001-.0015 slip fit for the inner/outer tapered bearings, radial run-out of the spindle/hub assy is now approx .003-.0035, which is pretty "tight" IMHO.....just curious what the factory min/max recommendation is...


MikeG


I assume you are measuring the radial runout on the register for the wheel which is where most of the discussions I read took the measurement. I couldn't find anything definitive. There is a lot of tribal information on the web that seems to agree at 0.003" maximum but again, I can find no "official" specification for radial runout.




Roger, yes I'm measuring radial runout on the register, as the wheel will be hub-centric mounted not lug centric mounted.....I think .003 is fairly tight for a run out value with no load on it, that's another dynamic value of unknown quantities, it might seem trivial to some reading this, but the customer's vehicle will be a 200 mph + capable speed runner that I'm doing the brakes and suspension on as well as an Aero package, so just looking at getting it right, out of the box with no issues....


Thanks
MikeG







Powered by UBB.threads™ PHP Forum Software 7.7.1