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Press brake

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Bernie

04-30-2003 18:15:45




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Does anyone know where I can get figures or a chart showing the tonnage per inch or foot to bend different thicknesses of steel in a press brake? I'm looking for a brake for bending 1/8 x 4' steel and I don't know the tonnage required. TIA




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cooter

05-03-2003 09:09:50




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 Re: Press brake in reply to Bernie, 04-30-2003 18:15:45  
It takes approx 7 1/2 ton pressure to bend a foot of 1/8 mild steel to a 90 degree angle provided 1/8 dies are used.You'll need 30 ton to bend a 4 foot piece providing you have 1/8 dies.If you use dies for a thicker material,less tonnage will be required and the bend won't be as sharp.I have a 5 foot,40 ton brake and its the best thing since sliced bread.Hope this helps you out.



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Bernie

05-03-2003 18:17:46




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 Re: Re: Press brake in reply to cooter, 05-03-2003 09:09:50  
Thanks Cooter. I was hoping someone could come up with that figure. All I need to do now is find a press for sale. Did you buy yours used? How much can I expect to pay? Thanks again. Bernie



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cooter

05-04-2003 15:35:13




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 Re: Re: Re: Press brake in reply to Bernie, 05-03-2003 18:17:46  
Bernie,I bought my press brake used from a plant that makes fire hydrants.Its an old flywheel type,probably from the 40's.(Chicago is the make)I didn't pay much for it but had to buy new dies and thats a killer.I think I paid around $250-$300 for a set of 1/8" dies 5 feet long.There are so many dies available for so many bending jobs.I use these dies on 1/4" plate but it bends very sharp.Its not feasible for me to have a set of dies for every size material,as I have a small,one man operation.I also have a set of goose neck dies for making channels.These dies are very pricey.I couldn't find any used dies as the mounting seems to be the same on all makes of brakes.When shops upgrade their brakes they keep their dies for their new machine and thats why its hard to find any used dies.I have a chart showing all the different shapes and sizes etc of dies and if you don't have any thing yet,I can scan and e-mail to you.You'll have to send me your e-mail address.I'll try to submit only once!!!!Cooter

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cooter

05-03-2003 09:08:56




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 Re: Press brake in reply to Bernie, 04-30-2003 18:15:45  
It takes approx 7 1/2 ton pressure to bend a foot of 1/8 mild steel to a 90 degree angle provided 1/8 dies are used.You'll need 30 ton to bend a 4 foot piece providing you have 1/8 dies.If you use dies for a thicker material,less tonnage will be required and the bend won't be as sharp.I have a 5 foot,40 ton brake and its the best thing since sliced bread.Hope this helps you out.



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Ray,IN

04-30-2003 19:58:14




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 Re: Press brake in reply to Bernie, 04-30-2003 18:15:45  
Machinery's Handbook has all your answers.



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mj

05-03-2003 08:12:43




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 Re: Re: Press brake in reply to Ray,IN, 04-30-2003 19:58:14  
Ray...just out of curiosity...which edition have you got? Mine's the 17th..... .gettin' long in the tooth! :-)



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Ray,IN

05-03-2003 20:57:46




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 Re: Re: Re: Press brake in reply to mj, 05-03-2003 08:12:43  
Bought my first book in 1962 and it finally began falling apart. Twenty First edition printed 1980 is my new book. I think the latest edition is the twenty seventh(technology). I retired from toolmaking in 1992.



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