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Making a stretch former to make a batch of the same part.

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  • Making a stretch former to make a batch of the same part.

    https://www.youtube.com/watch?v=h1gx...ature=emb_logo

    This is Kirkham using a simple stretch former to make a quarter panel piece in bronze ,

    has anyone else seen a shop made stretch former ?

    I went to the shop in town today that does it for the aircraft shops but they have massive expensive machines and I am sure prices to match !


  • #2
    and here is another video stretching an aluminum panel on a commercial machine,

    https://www.youtube.com/watch?time_c...ature=emb_logo
    Last edited by abarthdave; 08-11-2020, 05:48 PM.

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    • #3
      Click image for larger version

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ID:	3977 Sounds like a super cool way to make panels.
      Aston Martin and a few highend shop use Resin bucks and hammer form to make large panels....

      I have used small bits of brass sheet to made some nose grills for a Show winning Karmann Ghia Lowlight was a Top 3 car at Volksworld UK.. and polished Brass engine pipe work it did look Cool.

      .
      Last edited by Moving molecules .; 08-11-2020, 08:02 PM.
      https://www.precisionpanelcraft.co.uk/

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      • #4
        hey dave, there is a section in one of the metalshaping books timothy barton wrote about stretch forming. i think it was around the time of the model T production where they used a wooden buck, the sheet steel was clamped in the frame and the centre 'desired shape' was then raised by a jack to start the stretch formation, and the details then hammer formed in to it. if i can find it before someone else does i will take a pic or two and post it. i had a similar idea for making replacement panels for the porsche this way, only a wooden form inside a steel frame holding the clamps
        thanks neil

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        • #5
          Click image for larger version  Name:	20200812_101636.jpg Views:	0 Size:	2.23 MB ID:	3981
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          hopefully no copyright issues have been breached! all images were taken from tim bartons book number 4 which is in circulation

          maybe something similar could be mocked up?
          thanks neil

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          • #6
            Thanks , if you find it that would be great , and which of bartons books

            cheers

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            • #7
              also a shown here http://www.coachbuilt.com/bui/a/artz/artz.htm
              thanks neil

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              • #8
                thanks Neil , the Artz metal stretching press seems pretty simple , I wonder how much pressure you need to pull the sheet tight against the form ,

                what would you use for an edge clamp ?

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                • #9
                  Can l buy the Tim Barton Book sounds very good.
                  https://www.precisionpanelcraft.co.uk/

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                  • neilb
                    neilb commented
                    Editing a comment
                    they are still available I believe, I bought the first 4 books again when Tim Barton died, for spares or to resell later lol

                • #10
                  here is another rabbit hole to go down

                  https://patents.google.com/?q=(B21D11%2f02)

                  this is the US patent sub group for streched metal forming ,

                  when you pick a patent check the prior art which gives you other ideas ,

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                  • #11
                    Originally posted by neilb View Post
                    Click image for larger version Name:	20200812_101636.jpg Views:	0 Size:	2.23 MB ID:	3981
                    Click image for larger version Name:	20200812_101709.jpg Views:	0 Size:	2.09 MB ID:	3982

                    hopefully no copyright issues have been breached! all images were taken from tim bartons book number 4 which is in circulation

                    maybe something similar could be mocked up?
                    Artz.... has achieved quite a lot from the great article you have found.... I wonder what Type of Steel was used in 1905 ? .
                    https://www.precisionpanelcraft.co.uk/

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                    • #12
                      Originally posted by abarthdave View Post
                      what would you use for an edge clamp ?
                      personally I was thinking a pair of old slip rolls or something similar, an offset hole on each end so it would lock against a clamping face (or another slip roll with an offset hole) placed the right way it would pull tighter as pressure is applied to the die.

                      it's not an impossible task, the press die I made used three 5 ton hydraulic Jack's spread across an area of just over a metre,
                      thanks neil

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                      • #13
                        Cass Nawrocki has some good pictures of stretch formers he made for various pieces in his book, Any Impossibility in Shaping Metal.

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                        • #14
                          Click image for larger version

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                          • neilb
                            neilb commented
                            Editing a comment
                            that looks good, who is doing that work?

                          • Chris_Hamilton
                            Chris_Hamilton commented
                            Editing a comment
                            Several grand in just the setup, counting those BVA rams and clamps. Nice. Must be producing a decent sized run of parts?

                        • #15
                          Very very Cool.....the US is so on it.😎.
                          https://www.precisionpanelcraft.co.uk/

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