I did some more research and I see that common 6061-T6 is only about 10% elongation as T-4 would yeild closer to 16% and T-0 Closer to 30%. Elongation for a 96"in Diameter ring suggests a min of 12% Elongation. So basically in a nutshell your T-6 material has too much memory for a 30" CLR...
Are you rolling leg in or leg out? If you are using an anti twist I assume that you are rolling leg in. Please give a better description of what you mean by material cupping. Do you mean that the legs are rounding inward as you bend?
They are not too common over here in the States. They are a lot more money then the standard rolls is probably one reason. I have heard mixed review about them. One thing I have heard guys say is that they are not a tough as the fixed pyramid , which would make some sense.Though really I can't...
With the turn out at IMTS the last two years I cannot imagine anyone balking at people coming through their booths, even if it is just for a hat. Just a suggestion, you could have an Admin or Moderator ( or someone who is a notable poster that is going to be there at the show) designate a...
Basically your two bottom rolls are articulated opposed to the standard pyramid rolls. where on those the bottom two are fixed and the radius is made by the top roll, this allows for compounding radii also allows to bend tighter in most cases.
This is 4 x 2" Rectangular Solid, and this is a Angle Roll application. Being that it is a Solid, the material it's self capable of being bent to fairly tight radius. The issue being that the Material is going to be very strong and take a very strong Roll machine to accommodate (Which is...
Are you actually rolling this or are you bending on a Fixed Radius? You can Bend much tighter if you are Doing this Rotary Draw Style than Rolling this. You should post a print and I would be able to help you alot better.
What Type of bender are you using , are you rolling a ring , Easyway or Hardway??? If you are using a Standard Pyramid with 3 rolls driven rolling easyway than 82" is probably going to be the Minimum Radius (to the Centerline
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I would be curious to hear if you do find someone that is willing to do this.
However if you don't here is an alternate solution,
With that large of a Radius you could easily have that done non-mandrel with a very high quality bend for much much much cheaper and a fraction of the lead time...
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