Go Back OFN Forums > Badland Buggy Group > Chassis

Chassis Badland Buggy Chassis


Chassis Badland Buggy Chassis

Reply
 
Thread Tools
  #1  
Old 07-16-2009, 08:53 PM
Zim's Avatar
Zim Zim is offline
Fabricator
 
Join Date: Apr 2008
Posts: 33
Aluminum bike chassis.

I bought a wrecked bike and it has a bent subframe. The subframe on these bikes are welded in instead of bolted. I plan on replacing the subframe, but there are two cast aluminum bars that the subframe is welded to that are bent. Can these be heated slightly and pulled back into place?
Reply With Quote
  #2  
Old 07-16-2009, 10:20 PM
entropy's Avatar
entropy entropy is offline
Master Fabricator
 
Join Date: Sep 2007
Location: 95-miles from the center of Oregon.
Posts: 8,380
As a general rule of thumb...
You can not heat aluminum and have it do anything but lose strength...
__________________
When did empirical knowledge get replaced by a theoretical education?

Reply With Quote
  #3  
Old 07-16-2009, 10:44 PM
FrogDog's Avatar
FrogDog FrogDog is offline
Master Fabricator
 
Join Date: Dec 2007
Location: Maple Ridge, B.C. Canada
Posts: 3,152
I agree with 'E'

I'm not an aluminum connoisseur, but even with steel I will try to bend or straighten cold first depending on the structual needs of peice in question...

cheers bro..

Dog....
__________________
'Dog' is Never Wrong, Only Mistakin'
FrogDog FabWorx
Reply With Quote
  #4  
Old 07-16-2009, 11:05 PM
fabcam's Avatar
fabcam fabcam is offline
Site Admin
 
Join Date: Aug 2004
Location: MN
Posts: 4,567
x3 I wouldn't even bend it back and trust it, never mind the heating issue.
__________________
The Designers of Bend-Tech Products
www.Bend-Tech.com
Bend-Tech Dragon web site:
http://www.BendTechDragon.com

Cris Merry
Phone: 651-257-8715
Cris@bend-tech.com

Reply With Quote
  #5  
Old 07-16-2009, 11:07 PM
Zim's Avatar
Zim Zim is offline
Fabricator
 
Join Date: Apr 2008
Posts: 33
Do I have a chance of cold straightening it without it cracking? It's only about an inch out, but that seems like alot for aluminum.
Reply With Quote
  #6  
Old 07-16-2009, 11:07 PM
Zim's Avatar
Zim Zim is offline
Fabricator
 
Join Date: Apr 2008
Posts: 33
Your to fast for me cris.
Reply With Quote
  #7  
Old 07-17-2009, 12:33 AM
smackdaddy's Avatar
smackdaddy smackdaddy is offline
Master Fabricator
 
Join Date: Apr 2006
Posts: 431
can we have a pic??
Reply With Quote
  #8  
Old 07-17-2009, 01:23 AM
shaggy10000's Avatar
shaggy10000 shaggy10000 is offline
Master Fabricator
 
Join Date: Nov 2006
Location: Wickenburg, AZ
Posts: 1,205
A pic would help, but if its a relatively tight bend then the aluminum is toast. It doesnt like to bend, again as a general rule.
Reply With Quote
  #9  
Old 07-17-2009, 08:32 AM
Zim's Avatar
Zim Zim is offline
Fabricator
 
Join Date: Apr 2008
Posts: 33
I'll get a pic up by the end of the day.
Reply With Quote
  #10  
Old 07-17-2009, 01:09 PM
SUPERD's Avatar
SUPERD SUPERD is offline
Master Fabricator
 
Join Date: Apr 2008
Location: Bentonville, Arkansas
Posts: 373
Quote:
Originally Posted by Zim View Post
I bought a wrecked bike and it has a bent subframe. The subframe on these bikes are welded in instead of bolted. I plan on replacing the subframe, but there are two cast aluminum bars that the subframe is welded to that are bent. Can these be heated slightly and pulled back into place?
the newer aluminum frames have welded subframes because they are not designed to be repaired.
I would never trust my life on a straightened aluminum part.
that is why insurance companies are so quick to total street & dirt bike with aluminum frames "Liability"
all the newer BMW's & AUDI's (cars) have aluminum subframes & suspension components & they firmly state to never straighten anything, no matter how minor. If it is bent or has been hit even slightly it must be replaced.
Yes, this sucks & is freaking expensive but someones life could be cut short because of fatigue cracking at a later time, you don't want a wheel flying off @ 70mph.

I would cut off everything damaged & weld on a new piece on if it is even available.
Reply With Quote
  #11  
Old 07-17-2009, 11:27 PM
Zim's Avatar
Zim Zim is offline
Fabricator
 
Join Date: Apr 2008
Posts: 33
Not sure If I'm doing this right.
<a href="http://s828.photobucket.com/albums/zz203/Zim6/?action=view&current=BIKESUBFRAME4.jpg" target="_blank"><img src="http://i828.photobucket.com/albums/zz203/Zim6/BIKESUBFRAME4.jpg" border="0" alt="Photobucket"></a>

This is the bar that is bent on each side. Everything welded on behind this will be replaced.

<a href="http://s828.photobucket.com/albums/zz203/Zim6/?action=view&current=BIKESUBFRAME2.jpg" target="_blank"><img src="http://i828.photobucket.com/albums/zz203/Zim6/BIKESUBFRAME2.jpg" border="0" alt="Photobucket"></a>

<a href="http://s828.photobucket.com/albums/zz203/Zim6/?action=view&current=BIKESUBFRAME3.jpg" target="_blank"><img src="http://i828.photobucket.com/albums/zz203/Zim6/BIKESUBFRAME3.jpg" border="0" alt="Photobucket"></a>
Reply With Quote
  #12  
Old 07-18-2009, 12:24 AM
Bonehead's Avatar
Bonehead Bonehead is offline
Master Fabricator
 
Join Date: Jan 2008
Location: Colorado
Posts: 1,021
Reply With Quote
  #13  
Old 07-18-2009, 12:25 AM
Bonehead's Avatar
Bonehead Bonehead is offline
Master Fabricator
 
Join Date: Jan 2008
Location: Colorado
Posts: 1,021
Reply With Quote
  #14  
Old 07-18-2009, 12:26 AM
Bonehead's Avatar
Bonehead Bonehead is offline
Master Fabricator
 
Join Date: Jan 2008
Location: Colorado
Posts: 1,021
Reply With Quote
  #15  
Old 07-18-2009, 12:42 AM
entropy's Avatar
entropy entropy is offline
Master Fabricator
 
Join Date: Sep 2007
Location: 95-miles from the center of Oregon.
Posts: 8,380
I could be 100% wrong.

Be safe find a frame...
__________________
When did empirical knowledge get replaced by a theoretical education?

Reply With Quote
  #16  
Old 07-18-2009, 10:58 AM
Zim's Avatar
Zim Zim is offline
Fabricator
 
Join Date: Apr 2008
Posts: 33
You dont think it would be wise to cut it off at the weld in front of the shock in the first picture?
Reply With Quote
  #17  
Old 07-20-2009, 01:38 PM
SUPERD's Avatar
SUPERD SUPERD is offline
Master Fabricator
 
Join Date: Apr 2008
Location: Bentonville, Arkansas
Posts: 373
It's your life & checkbook.
do you trust your abilities or is someone else gonna do the welding?
I would check the steering neck & the rest of the frame before I put much time in it. there may be more damage than you are noticing since you are concentrating on the rear. secondary damage can go unnoticed easily.
aluminum is not a very forgiving material, I would look for a frame.
Reply With Quote
  #18  
Old 07-20-2009, 05:14 PM
Zim's Avatar
Zim Zim is offline
Fabricator
 
Join Date: Apr 2008
Posts: 33
I'm going to Tig it. Found a subframe online so I won't have to bed anything. Plan on adding a few gussets and boxing in the sub for some extra support for the 12 o'clock bar. Thanks for all the replys guys.
Reply With Quote
  #19  
Old 07-23-2009, 12:24 PM
SUPERD's Avatar
SUPERD SUPERD is offline
Master Fabricator
 
Join Date: Apr 2008
Location: Bentonville, Arkansas
Posts: 373
Hey Zim, you butch that frame up yet?
Reply With Quote
  #20  
Old 07-23-2009, 03:06 PM
TrxR's Avatar
TrxR TrxR is offline
Master Fabricator
 
Join Date: Nov 2007
Posts: 113
That look like a bad bend. I would definitely look close at that frame.

On a another note a local stunter here cracked his frame by the steering neck on his GSXR 750 about 3 years ago in an accident as well as mangling the subframe. He had a local machinist weld the frame and it has been fine and it gets abused as it is a full time stunt bike. But a stunt bike is different then something that is going to see alot of street duty or a road course .
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 -4. The time now is 03:48 PM.

Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Template-Modifications by TMS
Copyright 2012, Offroad Fabrication Network