Correct joining procedure when cutting a chassis

Post by **mike** » Sat Sep 30, 2006 8:03 am

One for you cletus,

I've cut my disco chassis into two and taken 12 inches out of it. In those manuals of yours whats the required way or suggested method of joining a chassis back togeather to get through certification. At the moment its butted back togeather with a box sleeve on the inside. Next weekend I am about to plate it on the sides with plates that have long taper run offs and not put any verticle welds as you wouldnt when joining an I-beam togeather. I havnt got a certifier involved as of yet and really should, might not have time before I do this next weekend.

Any thoughts would be appreciated.

Mike

NuTTa · Post by **NuTTa** » Sat Sep 30, 2006 8:09 am

Mike, see a local panel shop, they'll know how and what is required from the weld's, also you will probably need to get a repair certification for the modification to the chassis.

Cheers
Brendon

Post by **mike** » Sat Sep 30, 2006 8:14 am

NuTTa wrote:Mike, see a local panel shop, they'll know how and what is required from the weld's, also you will probably need to get a repair certification for the modification to the chassis.

Cheers
Brendon

What is a repair certification? who does these? I thought it would just have to be certified like normal?

Mike

NuTTa · Post by **NuTTa** » Sat Sep 30, 2006 8:19 am

The LN106 needed a repair cert cause of the water damage..lol..VTNZ used to do them ..but now they are contracted out, ring the vtnz and find out if and who does them in your area, from what they told me up here any modification to the chassis ( the chassis is deemed to be the vehicle not the body) would require a repair cert, they are happy to charge $400.00 up here for the pleasure of the cert.not sure if the complete vehicle cert covers it..you never know it might..

Cheers
Brendon

oldblue · Post by **oldblue** » Sat Sep 30, 2006 9:20 am

A couple of years ago, I made a FJ40 Crew Cab. The joins in the chassis where single V Butt , then I made up diamond plate's, which were cut from the old chassis steel.
the welding rods, low hydrogen type.

cletus · Post by **cletus** » Sat Sep 30, 2006 10:07 am

mike wrote:One for you cletus,

I've cut my disco chassis into two and taken 12 inches out of it. In those manuals of yours whats the required way or suggested method of joining a chassis back togeather to get through certification. At the moment its butted back togeather with a box sleeve on the inside. Next weekend I am about to plate it on the sides with plates that have long taper run offs and not put any verticle welds as you wouldnt when joining an I-beam togeather.

In the code of construction it says `the fishplate chassis join method is highly recommended at all stress points between front and rear axles`.
So what you`re describing sounds like it will be fine. Would be a good idea to get your certifier involved early, so if he sees any problems he can let you know.
There will be a new manual available soon, the Hobby Car Technical Manual, which has all the rules the certifiers have to follow, with explanations of the technical bits that make it easy for anyone to use.

mercutio · Post by **mercutio** » Sat Sep 30, 2006 10:59 am

woohoo are you working on the hybrid mike

it has been a while since the last installment
go hard dude :afro:

dixie · Post by **dixie** » Sat Sep 30, 2006 6:44 pm

There will be a new manual available soon, the Hobby Car Technical Manual, which has all the rules the certifiers have to follow, with explanations of the technical bits that make it easy for anyone to use.

Gday Cletus,where would one obtain one of these manuals once they are issued into circulation?

Cheers Mike.

Post by **mike** » Sat Sep 30, 2006 7:01 pm

mercutio wrote:woohoo are you working on the hybrid mike

it has been a while since the last installment
go hard dude :afro:

Yup tomorrow is the first day.
planned - take off rear tray, cut off back off chassis with drop saw - examine and mark out where to gas cut closer to axle for joining rear cross member on.

remove guards and bulkhead to get access for welding up chassis.

Will be heaps of fun.

Mike

Sadam_Husain · Post by **Sadam_Husain** » Sat Sep 30, 2006 8:02 pm

I had 2 landrover chassis joined together about 20 years ago (before they had invented certification), a local welding guy did it for me. He cut through behind the cab (lwb flatdeck), emptied out about 20 litres of sand from inside the chassis from when the paua poachers owned it, he cut the ends square and butted them together then plated around the outsides. I drove the thing in at 8am and drove it away again at 4.30pm. :lol:

Seemed pretty straight forward :lol:

MudBum · Post by **MudBum** » Mon Oct 02, 2006 4:10 pm

Mike,
Repair certifiers in ChCh are Neil Hesson,Gordon Taylor (Neil Hesson Certifiers) and Wayne Houghton (Perfect Autobodies)

ruf_zuki · Post by **ruf_zuki** » Tue Oct 03, 2006 9:59 pm

"and not put any verticle welds as you wouldnt when joining an I-beam togeather."

???

If an I-beam needed to be welded in the vertical position in a building then you cant just lay it on its side and do it downhand can you!!!!!!!

vertical up welds are fine, vertical down welds are weak as shit,

Post by **mike** » Tue Oct 03, 2006 10:38 pm

ruf_zuki wrote:"and not put any verticle welds as you wouldnt when joining an I-beam togeather."

???

If an I-beam needed to be welded in the vertical position in a building then you cant just lay it on its side and do it downhand can you!!!!!!!

vertical up welds are fine, vertical down welds are weak as shit,

Oh no I meant after they have been butted togeather and welded. then you fish plate it, you don't put any verticle welds on the fish plate as the welds cause a weak point in the beam. Just what I was told.

Mike

JTop · Post by **JTop** » Wed Oct 04, 2006 7:45 am

I think you are right Mike but I am self taught.
Also, I was told L/R fish plates have concave ends not convex so any cracks are led back under the supporting plate instead of down the chassis
J Top

Correct joining procedure when cutting a chassis

Correct joining procedure when cutting a chassis

Re: Correct joining procedure when cutting a chassis