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  1. #1

    Default Press brake - Opinions

    I bought a HF 20T press. My main use for it will be bending flatstock. My standard most common size will be 4x3/8" flatstock @ 90deg. I have attached a drawing of my plan. It is designed with what I have here in my shop.
    Any ideas/modifications will be appreciated.Press brake.jpg
    Attached Files Attached Files
    Last edited by aaronobrien; 01-23-2013 at 01:56 PM. Reason: ** added photo

  2. #2
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,898

    Cool

    Looks like it will work. You might want to make your top punch tighter than 90 degrees like 80 something. Mine is 42 degrees on a side...Bob
    Attached Images Attached Images
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  3. #3
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,831

    Default

    Bob is correct, you want your top & bottom dies tighter than 90 degrees or you will have trouble getting your pcs. to 90.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  4. #4

    Default

    So both the top and bottom @ 80 deg?

  5. #5
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,898

    Cool

    Quote Originally Posted by aaronobrien View Post
    So both the top and bottom @ 80 deg?
    No just the top. The bottom can be 90...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  6. #6

    Default

    Okay, so just the top @ 80 deg or so. Bottom can be 90deg....

    Does the punch have to be hardened? If so, what is the proper process for it?

  7. #7
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,898

    Cool

    Quote Originally Posted by aaronobrien View Post
    Does the punch have to be hardened? If so, what is the proper process for it?
    Thats up to you. How many parts you going to make? A zillion then yes. If the bottom center wears just regrind or recut it to suit. Just my thoughts...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  8. #8

    Default

    thanks bob,

    Over the course of a year, ill probably bend 100-200 pieces. possibly more if it works as well as it seems like it should.

  9. #9
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,831

    Default

    For air bending which is what you plan on doing the bottom should be less than 90. The 4 way die on the Cincinnati I used to run was 82*. The top should be sharper than 90 also. This lets you over bend slightly to compensate for spring back.

    I can't see how thick a plate your top die will be but I would use 1".
    Last edited by MMW; 01-23-2013 at 08:51 PM.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  10. #10
    Join Date
    Sep 2012
    Location
    seaford de
    Posts
    406

    Default

    I used angle for the top and bottom on my iron worker brake and it over bends a 90 every time if your not careful.

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