View Single Post
Old July 13th, 2005, 03:30 PM   #9
DickDV
Member
United States

DickDV is offline
 
Join Date: May 2002
Location: Kalamazoo MI
Posts: 2,319
You cannot do both drives as speed regulators even with a "ratio" adjustment because the speed error accumulates constantly increasing or decreasing the tension. (Assuming you don't want web stretch to provide the tension).

That's why the tension must be controlled either by direct tension measurement or by torque on the b drive. Using line speed from the a drive with a torque trim will do the job but no amount of speed trim will get this job done---you'd have to adjust it constantly to keep from building or decreasing tension.
  Reply With Quote