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Posted by Ignoramus24341 on March 6, 2008, 11:13 am
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I wanted to make a homemade brake for bending small sheet metal
things. (I have a press). I think that the concept is straightforward,
however, I would like to know if there is any sort of a table that
tabulated bending effort per inch of the width of metal being bent,
depending on thickness.
Also, for the dies, would it be more proper to use high speed steel as
opposed to mild steel (for strength).
Thanks
i
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Posted by Karl Townsend on March 6, 2008, 12:08 pm
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Look for a thread stated by me with a great response from Nick Mueller about
6-12 months ago.
I can't find it on short notice but he suggested a urethane insert similar
to this
http://cgi.ebay.com/1-X-12-URETHANE-INSERT-FOR-1-BOTTOM-DIE_W0QQitemZ7556901674QQihZ020QQcategoryZ41957QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
only better. Then make everything from plain old cold rolled steel.
Karl
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Posted by RoyJ on March 6, 2008, 12:21 pm
Please log in for more thread options Are you thinking a press brake?
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_479830_479830
Capacity is heavily dependent on the shape of the dies and especilly the
width. Narrower gives you a sharper bend at the expense of higher
required tonnage and more die wear.
Most of the shop built units I've seen for a 12 or 20 ton shop press use
heavy wall angle iron. Professional press brake dies are all hardened
tool steel. If you could find a 12" section of old press brake die, that
would be perfect.
Keep in mind that the work needs to be perfectly centered under the
cylinder.
Ignoramus24341 wrote:
> I wanted to make a homemade brake for bending small sheet metal
> things. (I have a press). I think that the concept is straightforward,
> however, I would like to know if there is any sort of a table that
> tabulated bending effort per inch of the width of metal being bent,
> depending on thickness.
>
> Also, for the dies, would it be more proper to use high speed steel as
> opposed to mild steel (for strength).
>
> Thanks
>
> i
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Posted by JR North on March 7, 2008, 1:47 am
Please log in for more thread options Mine:
http://www.metalworking.com/dropbox/_1998_retired_files/
see brake1.txt and the associated jpgs.
JR
Dweller in the cellar
Ignoramus24341 wrote:
> I wanted to make a homemade brake for bending small sheet metal
> things. (I have a press). I think that the concept is straightforward,
> however, I would like to know if there is any sort of a table that
> tabulated bending effort per inch of the width of metal being bent,
> depending on thickness.
>
> Also, for the dies, would it be more proper to use high speed steel as
> opposed to mild steel (for strength).
>
> Thanks
>
> i
--
--------------------------------------------------------------
Home Page: http://www.seanet.com/~jasonrnorth
If you're not the lead dog, the view never changes
Doubt yourself, and the real world will eat you alive
The world doesn't revolve around you, it revolves around me
No skeletons in the closet; just decomposing corpses
--------------------------------------------------------------
Dependence is Vulnerability:
--------------------------------------------------------------
"Open the Pod Bay Doors please, Hal"
"I'm sorry, Dave, I'm afraid I can't do that.."
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Posted by Pete C. on March 7, 2008, 7:23 am
Please log in for more thread options JR North wrote:
>
> Mine:
> http://www.metalworking.com/dropbox/_1998_retired_files/
> see brake1.txt and the associated jpgs.
Wrong type of brake. He wants a press brake like:
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_21896_21896
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> things. (I have a press). I think that the concept is straightforward,
> however, I would like to know if there is any sort of a table that
> tabulated bending effort per inch of the width of metal being bent,
> depending on thickness.
>
> Also, for the dies, would it be more proper to use high speed steel as
> opposed to mild steel (for strength).
>
> Thanks
>
> i