When a slip roll such as this one:
http://www.harborfreight.com/cpi/cta...emnumber=36698
is spec'ed as 12" x 20ga, I assume that means it can roll a 12" piece of
20ga (doh). But I also assume that if the piece is less than 12" wide,
it can be more than 20ga thick. The question is: how much thicker? Is
there a rule of thumb for the relationship of thickness & width?

I assume (again) that the limiting factor is the diameter of the roll.
That is, for example, if a 12" piece thicker than 20ga were put through
this roll, the rolls would deflect & cause uneven rolling of the stock.
But narrower pieces would be rolled near one end, minimizing the
deflection of the roll. ??

Thanks,
Bob

On Apr 27, 4:35*pm, Bob Engelhardt wrote:
When a slip roll such as this one:http://www.harborfreight.com/cpi/cta...emnumber=36698
is spec'ed as 12" x 20ga, I assume that means it can roll a 12" piece of
20ga (doh). *But I also assume that if the piece is less than 12" wide,
it can be more than 20ga thick. *The question is: how much thicker? *Is
there a rule of thumb for the relationship of thickness & width?

I assume (again) that the limiting factor is the diameter of the roll.
That is, for example, if a 12" piece thicker than 20ga were put through
this roll, the rolls would deflect & cause uneven rolling of the stock.
* But narrower pieces would be rolled near one end, minimizing the
deflection of the roll. *??

Thanks,
Bob

I believe the stiffness in proportional to the width and to the
thickness cubed. So if the thickness was twice as thick as 20 gauge
then the width would have to be 1/8 of 12 inches or 1.5 inches.


Dan

On Apr 27, 10:35*am, Bob Engelhardt wrote:
When a slip roll such as this one:http://www.harborfreight.com/cpi/cta...emnumber=36698
is spec'ed as 12" x 20ga, I assume that means it can roll a 12" piece of
20ga (doh). *But I also assume that if the piece is less than 12" wide,
it can be more than 20ga thick. *The question is: how much thicker? *Is
there a rule of thumb for the relationship of thickness & width?

I assume (again) that the limiting factor is the diameter of the roll.
That is, for example, if a 12" piece thicker than 20ga were put through
this roll, the rolls would deflect & cause uneven rolling of the stock.
* But narrower pieces would be rolled near one end, minimizing the
deflection of the roll. *??

Thanks,
Bob

This is how equipment gets broken. ;)

Stay with the manufacturer's requirements...and with HF it is wise to
stay below their spec.

TMT

On Apr 27, 11:35*am, Bob Engelhardt wrote:
When a slip roll such as this one:http://www.harborfreight.com/cpi/cta...emnumber=36698
is spec'ed as 12" x 20ga, I assume that means it can roll a 12" piece of
20ga (doh). *But I also assume that if the piece is less than 12" wide,
it can be more than 20ga thick. *The question is: how much thicker? *Is
there a rule of thumb for the relationship of thickness & width?
...
Bob

The shear, brake and rolls on my 30" 3-in-1 barely work to spec. I
think the rule of thumb should be don't try to push them at all. The
rolls deflect and the work piece is barrel shaped, rolled tighter at
the ends.

jsw