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

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  • abarthdave
    replied
    Here is a short video of Kirkham in Poland and a stretch form , first minute shows it,.......


    https://www.youtube.com/watch?v=dBX8u8gVik4

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

  • abarthdave
    replied
    the picture was something I found on the net , no idea what shop it is at......

    I will try and look.....

    OK found it ,
    https://www.aircorpsaviation.com/leg...t-fabrication/

    looking at old aviation books will teach you many ways to shape metal ,
    from building in a factory to fixing it later , ........
    Last edited by abarthdave; 17-08-20, 02:46 PM.

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  • Moving molecules .
    replied
    Very very Cool.....the US is so on it.😎.

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  • neilb
    commented on 's reply
    that looks good, who is doing that work?

  • abarthdave
    replied
    Click image for larger version

Name:	metalworking Stretch Form.jpg
Views:	59
Size:	219.1 KB
ID:	3999

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  • Chris_Hamilton
    replied
    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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  • neilb
    commented on 's reply
    they are still available I believe, I bought the first 4 books again when Tim Barton died, for spares or to resell later lol

  • neilb
    replied
    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,

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  • Moving molecules .
    replied
    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 ? .

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  • abarthdave
    replied
    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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  • Moving molecules .
    replied
    Can l buy the Tim Barton Book sounds very good.

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  • abarthdave
    replied
    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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  • neilb
    replied
    also a shown here http://www.coachbuilt.com/bui/a/artz/artz.htm

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

    cheers

    Leave a comment:

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