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  1. #136
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    Jan 2012
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    us
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    1

    Default 1/2" steel?

    Does anyone know what dimensions I would need to change to use 1/2" steel in the design? I am located in the states and don't have access to metric flat stock.

    Thanks, Don

  2. #137
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    59
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    6,541

    Default

    That thread does date back so it is possible that none of those who built are using the forum at the moment.
    1/2" is only (roughly) 28 thou over 12mm, so one option is to take a whisker off some 1/2" to make it metric.
    You may have to look at the drawings (I haven't as I already have a finger brake) and adjust some dimensions but thinking about a typical finger brake design I doubt there would be much that would need to change as they are reasonably basic machines.
    Can't help much I'm afraid

    Michael

  3. #138
    Join Date
    Jun 2007
    Location
    Vic
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    48
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    544

    Default

    it doesnt need to be exactly the same. I am using 16mm by 75mm and here its in progress. You just need to change the length of the linkages to bring the fingers up/down or back/forth






  4. #139
    Join Date
    Jun 2007
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    Vic
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    Default

    Finally done, Thanks again








    Not quite, still the handle to go

  5. #140
    Join Date
    Sep 2002
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    Minbun, FNQ, Australia
    Age
    66
    Posts
    2,012

    Default

    Cliff.
    ...if all you have is a hammer, everything looks like a nail...

  6. #141
    Join Date
    Oct 2010
    Location
    melbourne, laverton
    Posts
    1,910

    Default

    hi mate great photos. you have reminded me i want to build this tool. . why did you choose 25mm steel.
    aaron

  7. #142
    Join Date
    Apr 2010
    Location
    Rural Victoria
    Posts
    358

    Default

    Quote Originally Posted by jackaroo View Post
    Finally done, Thanks again








    Not quite, still the handle to go
    Very nice, thought about going into competition with Hare & Forbes?

    I've got all the bits here, just gotta find the roundtoit.

  8. #143
    Join Date
    Apr 2010
    Location
    Rural Victoria
    Posts
    358

    Default

    Quote Originally Posted by dbachman View Post
    Does anyone know what dimensions I would need to change to use 1/2" steel in the design? I am located in the states and don't have access to metric flat stock.

    Thanks, Don
    I originally sourced my design from the David Gingery book 'how to build a sheet metal brake from scrap'. All of the dimensions in this book are imperial. I think a lot of the material he uses is 1/4" plate so you might just have to scale everything by a factor of two.

  9. #144
    Join Date
    Jun 2007
    Location
    Vic
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    48
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    544

    Default

    Aaron, that is 16mm by 75mm, same as the fingers

    Finally, something not made in China :P




    With proper handles


    I actually learned a lot by making this thing.

  10. #145
    Join Date
    Apr 2009
    Location
    Ballina N.S.W.
    Posts
    644

    Default

    Hi jackaroo,
    You have made a nice job on this bender, I like how you beefed up the fingers they need it especially the narrow width ones. I made mine with some heavier sections also - see post 116.One area that I am about to modify on mine is the finger angle, I used 45 degrees but find you do not get sufficient clamping pressure on wider sheet and slippage is always on the cards. What angle have you used and have you tried it out on wide/heavy gauge material for slippage?
    Bob

  11. #146
    Join Date
    Aug 2005
    Location
    Perth
    Posts
    185

    Default

    Very nice, the skills you learn from doing this is worth doing it on its own.

    I would like to re-interate, this project was designed for folding small pieces of metal, it was never really designed to fold a full width all the time, unfortunatley it needs a lot of beefing up to achieve that.

    Anyway nice job, and same goes for all the others, very impressive.

    Steve
    Designer

  12. #147
    Join Date
    Jun 2007
    Location
    Vic
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    48
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    544

    Default

    Thanks Steve[SIMSO] for the design and drawings.

    Hi Krisfarm,
    The angle is about 55 degree. I also used thicker material.
    10mm for the linkages,
    12mm for the ends.
    75x50x8 for the top section where the fingers clamp to.
    12x110 for the bed and 75x50x6 welded under.




    The bore of that bronze is 40mm. I just tried 1.5mm SS with 150mm in length before without any issue...

  13. #148
    Join Date
    Apr 2009
    Location
    Ballina N.S.W.
    Posts
    644

    Default

    jackaroo,
    Thanks for the details and photos of your bender, the 55 degree angle and beefed up construction should help with your clamping as well. I will look forward to how you find it in use.
    Bob

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