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Posted by mkr5000 on April 14, 2008, 9:23 am
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I've never owned a slip roll or done much round bending before.
I'd like to bend some 050 or 063 aluminum in a "U" shape -- about 2.5"
deep and perhaps a 3/8 to 1/2" radius.
I do have a finger brake but don't see how I can creatively use it, or
even a vice etc.
Can a slip roll do a bend that tight? It looks like they can only do
larger (1" or so).
Any ideas? Any home shop tools I can look at?
THANKS much.
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Posted by Den on April 14, 2008, 9:33 am
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> I've never owned a slip roll or done much round bending before.
>
> I'd like to bend some 050 or 063 aluminum in a "U" shape -- about 2.5"
> deep and perhaps a 3/8 to 1/2" radius.
>
> I do have a finger brake but don't see how I can creatively use it, or
> even a vice etc.
>
> Can a slip roll do a bend that tight? It looks like they can only do
> larger (1" or so).
>
> Any ideas? Any home shop tools I can look at?
>
> THANKS much.
How wide? For a one or two off try to press a form into a die using a bench
vice?
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Posted by Lloyd E. Sponenburgh on April 14, 2008, 9:40 am
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>
> ..
>> I've never owned a slip roll or done much round bending before.
>>
>> I'd like to bend some 050 or 063 aluminum in a "U" shape -- about
>> 2.5" deep and perhaps a 3/8 to 1/2" radius.
>>
>> I do have a finger brake but don't see how I can creatively use it,
>> or even a vice etc.
>>
>> Can a slip roll do a bend that tight? It looks like they can only do
>> larger (1" or so).
>>
>> Any ideas? Any home shop tools I can look at?
>>
>> THANKS much.
>
>
> How wide? For a one or two off try to press a form into a die using a
> bench vice?
>
>
>
>
The standard method in the 'ordinary' sheet metal fab is to use radiusing
noses on your fingers, and set the platen away from the center of radius
by the radius of the noses, plus the thickness of the metal. Polished
parts make a big difference in quality of the finished bend.
LLoyd
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Posted by DT on April 14, 2008, 9:45 am
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>I'd like to bend some 050 or 063 aluminum in a "U" shape -- about 2.5"
>deep and perhaps a 3/8 to 1/2" radius.
>
>I do have a finger brake but don't see how I can creatively use it, or
>even a vice etc.
>
>Can a slip roll do a bend that tight? It looks like they can only do
>larger (1" or so).
>
A slip roll can only roll as small as the roller size, plus some springback.
And it cannot generally make a U shaped piece with straight sides, the entire
piece you feed in will roll into a circle. It is possible to insert the sheet
with the rolls backed off and then tighten them down gradually when you are at
the bend point, then you roll back and forth. I don't know if it would work for
such a tight bend.
At work we had finger brakes with radiused noses, but not as large a radius as
you want. It would require a brake with an articulated bar. And they will not
bend a 180 anyway.
I think you need a press brake with a deep female die and a round-nose
'pusher'.
--
Dennis
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Posted by Ronald Thompson on April 14, 2008, 9:53 am
Please log in for more thread options mkr5000 wrote:
> I've never owned a slip roll or done much round bending before.
>
> I'd like to bend some 050 or 063 aluminum in a "U" shape -- about 2.5"
> deep and perhaps a 3/8 to 1/2" radius.
>
> I do have a finger brake but don't see how I can creatively use it, or
> even a vice etc.
>
> Can a slip roll do a bend that tight? It looks like they can only do
> larger (1" or so).
>
> Any ideas? Any home shop tools I can look at?
>
> THANKS much.
This sounds like a press brake job. You don't give the length of the
bend. Commercial press brakes can do huge work, but a 6" vise can do
small items in thin stock. Harbor freight had a magnetic press brake
adapter for a 6" vise. The blades that come with it are too sharp. but a
piece of steel rod of the appropriate diameter can be made to work by
welding it to form an edge on rectangular bar stock. Or the bar stock
can be ground to suit. The V bottom will work OK for an air bend like this.
If the vise is too small, appropriate dies can be made for a hydraulic
or an arbor press.
I looked at the HF web site for an example, but didn't find it. Here is
one from Grizzly:
<http://grizzly.com/products/H3243>
Feel free to email me if you need more info. I used to run a 12' press
brake.
--
Ron Thompson
Riding my '07 XL883C Sportster
On the Beautiful Florida Space Coast,
right beside the Kennedy Space Center,
USA
http://www.plansandprojects.com
My hobby pages are here:
http://www.plansandprojects.com/My%20Machines/
Visit the castinghobby FAQ:
http://castinghobbywiki.plansandprojects.com/
The member map is here:
http://www.frappr.com/castinghobby
This ain't football, you can't just sit in a computer chair and memorize
facts.
-Ron Thompson
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>
> I'd like to bend some 050 or 063 aluminum in a "U" shape -- about 2.5"
> deep and perhaps a 3/8 to 1/2" radius.
>
> I do have a finger brake but don't see how I can creatively use it, or
> even a vice etc.
>
> Can a slip roll do a bend that tight? It looks like they can only do
> larger (1" or so).
>
> Any ideas? Any home shop tools I can look at?
>
> THANKS much.