Youtube sheetmetal forming.

[Trollhole]

Cool stuff.

Shrinking




This is just plain crazy.

 

[Fast Eddy]

Cool stuff.

x2

The hydroforming one looks like an expansion pipe for a dirt bike maybe.

 

[Awl_TEQ]

The first video is a technique described in the "Oilcan roof" thread. Though in that thread it is advised to do one spot at a time and completely cool the workpiece before continuing. Good advice if you've never done it before.

The second video didn't work for me.

The third is very cool. I wonder if a guy could make fender flares to replicate the box sides of an FJ45 LWB and then weld them onto a new side panel. I have made new box sides but couldn't make the stock wheel arch flare. Prolly take a lot of trial and error.

 

[Pipesmoke]

Re the second film: I've just used a shrinker/stretcher to form repair panels for the rear quarter panels. Put the return on first and then use the shrinker to form the curve - it shrinks the return and pulls the panel to the required curve. Amazing tool. Will post photos when I've done enough posts.

BJ40 with HJ60 running gear

 

[Awl_TEQ]

Shrinker/stretchers are very useful. Of all the sheetmetal tools I have at home and (mostly) work - I don't have one.

 

[malcb]

This would be good for fenders - the metal is over a former die and the tool makes the shape - spooky, sort of too easy.



EDIT:

Suppose it's just another form of metal spinning but allows parts other than pure rotational shapes to be made

 

[Awl_TEQ]

I've always wanted to try spinning on the lathes ant work. It just seems like it would be quite fun to play with.

 

[Pipesmoke]

Thought I try to show a couple of pics showing the Shrinker/stretcher when I made my rear quarter repair panels.

The advantage is you don't then have to weld on the return.

Obviously still much to do on my BJ40 before welding it!