Ring Spinning
Slip is not a maintenance abstraction. A two percent loss on the tape is two percent of the twist the yarn was sold with.
— %
Spindle speed lost between tape and wharve
Check slip across the frame, not on one spindle: a rising spread between the drive end and the far end is the tape tensioner, while a uniform loss is usually the tape itself.
Spindle Wharve, Tape Speed & Slippage Calculator — free, with the formula and a worked example, at Textile School.