All MetalShaping

All MetalShaping (https://www.allmetalshaping.com/index.php)
-   Automotive Projects (https://www.allmetalshaping.com/forumdisplay.php?f=20)
-   -   Making a 1950 David Brown Tractor Fuel Tank From Scratch (https://www.allmetalshaping.com/showthread.php?t=20541)

Stretch 06-25-2021 06:37 AM

Making a 1950 David Brown Tractor Fuel Tank From Scratch
 
Hi folks. Iíve been commissioned to make a David Brown 1950 Tractor fuel tank from scratch. Itís a nice project, with a few quirks, so maybe of interest to others.

I played around with a few techniques - particularly shrinking - as I wanted to see which method would work best/fastest for the given situation. Of particular interest was an old school method of torch shrinking I hadnít done in a while. Time to fire up the oxy-acetylene 👍

Hope you like the project as it slowly evolves.

Hereís the knackered, rusted out tank. DB only made 330 of These, so very scarce!

https://i.postimg.cc/zDRHfbN5/744-D5...DE3-E10-B9.jpg

https://i.postimg.cc/SKFkDs5L/4-EFAA...C00-D201-A.jpg

https://i.postimg.cc/G350XtTB/D9-CFF...59-D975-B3.jpg

Stretch 06-25-2021 06:40 AM

First step was to make card templates. I decided to make the top half from three pieces and weld the three together in the center of the double radius. Easy access for smoothing and planishing.

https://i.postimg.cc/tgZDCRCc/406-A5...1-C4-ECF13.jpg

Stretch 06-25-2021 06:42 AM

I cut the blank with an additional 1/2Ē border to allow for the flange and excess to then cut away.

https://i.postimg.cc/wv5X71Kw/D7178-...15-D5837-F.jpg

Stretch 06-25-2021 06:45 AM

For the first shrinking method, I used my Pullmax with homemade shrinking dies. The result was very fast and got me to about 80% of where the shrink needed to be.

https://i.postimg.cc/SKgqqrRd/26-CF4...39-CCF9-FC.jpg

https://i.postimg.cc/pT9d67Cz/557531...0375132539.jpg

Stretch 06-25-2021 06:49 AM

After shrinking on the Pullmax, the end panel was blended to smoother the transition from the shrunk radius to the low crown shape of the end of the tank.

https://i.postimg.cc/Rh9jHJWh/467987...4-F5960-F3.jpg

Stretch 06-25-2021 06:51 AM

The first side plate came out well. Happy with the fit and finish, although I did employ another shrinking technique just on the edge: my kick shrinker.

https://i.postimg.cc/rpZGBD6b/67456-...29-FF4-ACA.jpg

Stretch 06-25-2021 06:58 AM

For the main part of the tank, I folded the two 90 degree flanges and then hand bent the panel over the tank. I then employed some heat shrinking to create the double curvature.

https://i.postimg.cc/G2543Dq0/EE6-B9...8-F94-AF27.jpg

https://i.postimg.cc/vBcWvbKs/0-FFD3...B7539-DCCE.jpg

Stretch 06-25-2021 07:01 AM

The curvature of the tank was then smoothed out, some more heat shrinking was applied until the desired shape was formed. A final planish brought the panel to readied state for tack welding the two parts together.

https://i.postimg.cc/yxCkSK4n/EA3-D4...11-E99-CF3.jpg

Stretch 06-25-2021 07:03 AM

Once the two parts were tack welded, some planishing and cleaning ensued to help make the final weld as clean as possible.

https://i.postimg.cc/W4RLV1M9/D7-AFD...-D6-DF8-E1.jpgdangers of intermittent fasting

Stretch 06-25-2021 07:08 AM

I then tig-welded the joint to reduce heat damage. I added additional filler metal to enable enough material for the weld zone to be filed, smoothed and planished. I wanted an invisible joint from the outside. Penetration was super important.

https://i.postimg.cc/Z5H77YwB/82-C27...B37-E869-D.jpg

https://i.postimg.cc/6QDdzDx4/4-D326...3-BB131-A0.jpg


All times are GMT -5. The time now is 06:43 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.