On longer lengths, a constraint that may be encountered is that the maximum feeder speed is too slow. You could change the selected gear ratio to allow slitting line for a faster maximum motor speed, but you would be giving up torque and losing some of the advantage of smaller reflected inertia.

Another long-sheet constraint is the leveler gear in speed. The maximum line speed at the leveler divided by the cut length gives you the maximum PPM for longer lengths. Also, the amount of material stored in the loop must be considered for longer lengths.

These constraints must be observed for all cut lengths. You can do some things to pipe welding line overcome them. Sometimes it is a trade-off with other constraints, and sometimes a larger, faster motor will do the trick. But oftentimes you will find a situation of diminishing returns as you try to apply bigger motors. That is, the larger torques require larger frames that have larger inertias, and as you apply the formulas, you will find that the expected results begin to drop off even though you have a larger motor.