I hadn't. Not seen a UMM in the flesh for donkeys years. One of the blokes I used to work with had one, but that was back in the 80s.

interesting read as it’s peeing down with rain ;)

Think the last time I saw one was at the Bromley car pageant at Norman’s park
 
Now your have me thinking. Some one said upside down u section ? Don't really understand . It would not be that strong lying flat I think.
 
Now your have me thinking. Some one said upside down u section ? Don't really understand . It would not be that strong lying flat I think.

Use thicker steel, and weld a lip round the bottom of the U on the outside to strengthen it. That's what the UMMs had.
 
Now your have me thinking. Some one said upside down u section ? Don't really understand . It would not be that strong lying flat I think.

You could also weld little stiffener bars across the bottom of the U section in places, they would add stiffness, but without trapping dirt.
 
The chassis has curves.does anyone see problems instead of curves make it angles ie slopes to get the same shape.make it out of 8mm c section last forever
 
The chassis has curves.does anyone see problems instead of curves make it angles ie slopes to get the same shape.make it out of 8mm c section last forever

As far as I know, it is only the front and rear dumb irons that have curves. The rest is all straight. You could use short straight sections, cut at an angle, and weld them together to approximate curves. I think the curves are necessary for axle articulation.
 
@Turboman

Looks like a good design, the way the holes are pressed, i assume that’s to strengthen it

2B2FE1EC-E947-4BD8-962B-22E6B68923B5.jpeg
 
Thanks guys I going to make it out of c section now. Thanks alot
I would say that's the way to go. Use your old chassis as reference for your body mounts etc. We used to build chassis for HD earth moving machines where I served my time and they were C section. Your a plater so have the skills to do it. Crack on and I'll look forward to seeing the result.
 
Out of curiosity would u use something like a mig for this kind of chassis work plse

Thks :D
Very much. All our welding on plate steel was done by stick......but that was 30 odd years ago. MIG has taken over now pretty much. What welding is used in ship building nowadays??
 
I've sent you a message (little envelope top right should be flashing).

I can send you a .dxf or.dwg of the chassis rails.
 
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Very much. All our welding on plate steel was done by stick......but that was 30 odd years ago. MIG has taken over now pretty much. What welding is used in ship building nowadays??

Many thks :D

Afraid , Can’t answer what they use for ship building welding
 
The chassis has curves.does anyone see problems instead of curves make it angles ie slopes to get the same shape.make it out of 8mm c section last forever
You don't really want angles because these are stress raisers and it'll be more likely to fail there. If you make it out of 8mm you can make it any shape you like, but it will be ridiculously heavy.
 
Surely this then becomes a modified chassis rather than a replacement chassis and then requires inspection?
Yes, and we have to inform our insurers, it's what we do. Although, if he goes back to plan A, it will be a copy and therefore a replacement.
 
You don't really want angles because these are stress raisers and it'll be more likely to fail there. If you make it out of 8mm you can make it any shape you like, but it will be ridiculously heavy.
You're right. Could you imagine a chassis 4 times heavier than standard? I'm not sure the brakes and tyres would cope in an emergency situation.

Col
 

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