Bent Shaft Fix? - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Axle Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier All Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old May 16th, 2013, 07:23 AM   #1
GearDrive
A little slow
 
GearDrive's Avatar
 
Join Date: 10-30-07
Location: Charlotte, Mi
Posts: 593
iTrader: (6)
Mentioned: 0 Post(s)
Default Bent Shaft Fix?

I have a rear axle shaft that is slightly bent. Can I remove the studs, put in lathe, and remachine the face square?
GearDrive is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old May 16th, 2013, 07:32 AM   #2
wave_crusher
I'll Direc your TV
 
wave_crusher's Avatar
 
Join Date: 01-20-09
Location: Big Rapids, MI
Posts: 4,942
iTrader: (21)
Mentioned: 1 Post(s)
Default

You can, but you'd be taking away from the structural integrity of the shaft end. It'll probably break next time instead of bend
wave_crusher is offline   Reply With Quote
Old May 16th, 2013, 07:33 AM   #3
REPBOY
Big Rig Builder
 
REPBOY's Avatar
 
Join Date: 04-06-13
Location: DEARBORN, MI
Posts: 189
iTrader: (1)
Mentioned: 0 Post(s)
Default

^^this
REPBOY is offline   Reply With Quote
Old May 16th, 2013, 07:44 AM   #4
Nuggets
I fix stuff!
 
Nuggets's Avatar
 
Join Date: 09-15-06
Location: Bay City, MI
Posts: 13,415
iTrader: (13)
Mentioned: 2 Post(s)
Default

Quote:
Originally Posted by GearDrive View Post
I have a rear axle shaft that is slightly bent. Can I remove the studs, put in lathe, and remachine the face square?
I would put the shaft in a press and straighten it. Yes, the structural integrity will be compromised, but if you are on a budget, you can get some more run time out of the shaft. Since you have access to a lathe, a final cleanup after straightening might not be a bad idea.
Nuggets is offline   Reply With Quote
Old May 16th, 2013, 07:54 AM   #5
GearDrive
A little slow
 
GearDrive's Avatar
 
Join Date: 10-30-07
Location: Charlotte, Mi
Posts: 593
iTrader: (6)
Mentioned: 0 Post(s)
Default

I have driven on this shaft for 80,000 miles. It would just squeek and and wear out the pads every 30,000 miles. I replaced it last year with a good used one and now that one is bent to phuck from an accident. I think that I would only have to take off .010-.015 from the face to true it up.
GearDrive is online now   Reply With Quote
Old May 16th, 2013, 08:32 AM   #6
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 21,001
iTrader: (21)
Mentioned: 12 Post(s)
Default

If it is slightly bent, either fix will work without compromising anything. How far out is it? Is it the axle or the flange that is bent? If it is out very far, remachining the face will work but your studs will be slightly crooked.


Quote:
Originally Posted by wave_crusher View Post
You can, but you'd be taking away from the structural integrity of the shaft end. It'll probably break next time instead of bend
This is a way over the top statement, especially when you don't know how bad it is bent. The OP says he has been driving it a long time but his brake pads rub. The only time bending something back impacts the integrity is if you are stretching the material to the point where you are starting to fatigue it. This DOES NOT happen in one bend.
__________________
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.
whiterhino is offline   Reply With Quote
Old May 16th, 2013, 08:36 AM   #7
GearDrive
A little slow
 
GearDrive's Avatar
 
Join Date: 10-30-07
Location: Charlotte, Mi
Posts: 593
iTrader: (6)
Mentioned: 0 Post(s)
Default

I haven't put an indicator on it yet. I agree that trying to bend it back will fatigue it.
GearDrive is online now   Reply With Quote
Old May 16th, 2013, 08:57 AM   #8
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 21,001
iTrader: (21)
Mentioned: 12 Post(s)
Default

Quote:
Originally Posted by GearDrive View Post
I haven't put an indicator on it yet. I agree that trying to bend it back will fatigue it.
How so? Again, how far is it bent? You will not fatigue it unless you are stretching the shit out of the far side to bend it back. Do some research on the percentage of plastification while bending metals. You will find that what you are doing has very little impact on the integrity.

Take a piece of banding strap and put a slight bend in it. Bend it back straight. Now bend it again a little bit in the same spot. Did it break? No. Neither will your axle.
__________________
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.
whiterhino is offline   Reply With Quote
Old May 16th, 2013, 09:38 AM   #9
GearDrive
A little slow
 
GearDrive's Avatar
 
Join Date: 10-30-07
Location: Charlotte, Mi
Posts: 593
iTrader: (6)
Mentioned: 0 Post(s)
Default

It's not bent much, but it already bent past its yeild point to cause plastic deformation. By bending it back the other way, you cause more plastic deformation in the opposite direction. I'm not exactly sure the kind of material or hardening used to make these axles, but I'm pretty sure it's not the same as banding material.
GearDrive is online now   Reply With Quote
Old May 16th, 2013, 10:00 AM   #10
wave_crusher
I'll Direc your TV
 
wave_crusher's Avatar
 
Join Date: 01-20-09
Location: Big Rapids, MI
Posts: 4,942
iTrader: (21)
Mentioned: 1 Post(s)
Default

Quote:
Originally Posted by whiterhino View Post
If it is slightly bent, either fix will work without compromising anything. How far out is it? Is it the axle or the flange that is bent? If it is out very far, remachining the face will work but your studs will be slightly crooked.



This is a way over the top statement, especially when you don't know how bad it is bent. The OP says he has been driving it a long time but his brake pads rub. The only time bending something back impacts the integrity is if you are stretching the material to the point where you are starting to fatigue it. This DOES NOT happen in one bend.
You do know that he didn't say that he's been driving on it for a while until after I posted right? Take a look at the post again
wave_crusher is offline   Reply With Quote
Old May 16th, 2013, 11:30 AM   #11
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 21,001
iTrader: (21)
Mentioned: 12 Post(s)
Default

Quote:
Originally Posted by GearDrive View Post
It's not bent much, but it already bent past its yeild point to cause plastic deformation. By bending it back the other way, you cause more plastic deformation in the opposite direction. I'm not exactly sure the kind of material or hardening used to make these axles, but I'm pretty sure it's not the same as banding material.
Give me how much it's bent, where, material type and Ys and the dimensions and I'll tell you how much plastic you have bent it. My guess is it's a very low number. Do you realize that in almost any shaft manufacturing, the parts are bent and straightened during the manufacturing process? I have been in heat treating facilities where there are entire departments dedicated to straightening shafts.
__________________
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.
whiterhino is offline   Reply With Quote
Old May 16th, 2013, 11:57 AM   #12
GearDrive
A little slow
 
GearDrive's Avatar
 
Join Date: 10-30-07
Location: Charlotte, Mi
Posts: 593
iTrader: (6)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by whiterhino View Post
Give me how much it's bent, where, material type and Ys and the dimensions and I'll tell you how much plastic you have bent it. My guess is it's a very low number. Do you realize that in almost any shaft manufacturing, the parts are bent and straightened during the manufacturing process? I have been in heat treating facilities where there are entire departments dedicated to straightening shafts.
I have seriously considered straightening it out. But all those factors are unknown to me. Instead of taking that chance I thought simply skimming the face would be a safe alternative. The area bent is probably between the induction hardened bearing surface and the flange. The material properties change in this short area. Since I don't have easy access to to the manufacturing and heat treating facilities, I've decided it would not be a good idea for me to try to straighten it.
GearDrive is online now   Reply With Quote
Old May 16th, 2013, 12:44 PM   #13
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 21,001
iTrader: (21)
Mentioned: 12 Post(s)
Default

sent you a pm.
__________________
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.
whiterhino is offline   Reply With Quote
Old May 17th, 2013, 06:31 AM   #14
GearDrive
A little slow
 
GearDrive's Avatar
 
Join Date: 10-30-07
Location: Charlotte, Mi
Posts: 593
iTrader: (6)
Mentioned: 0 Post(s)
Default

It was out .018, turned it square. Will hope for the best.
GearDrive is online now   Reply With Quote
Old May 17th, 2013, 01:28 PM   #15
whiterhino
I'm not old, honest...
 
whiterhino's Avatar
 
Join Date: 03-07-06
Location: Davisburg MI
Posts: 21,001
iTrader: (21)
Mentioned: 12 Post(s)
Default

.018", as in .009"/ side? That's nothin. Glad you got it fixed.
__________________
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.
whiterhino is offline   Reply With Quote
Old May 17th, 2013, 02:41 PM   #16
GearDrive
A little slow
 
GearDrive's Avatar
 
Join Date: 10-30-07
Location: Charlotte, Mi
Posts: 593
iTrader: (6)
Mentioned: 0 Post(s)
Default

Thanks for the help Jim
GearDrive is online now   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Axle Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:28 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.16307 seconds with 69 queries