R7e states: An unlimited amount of rope / string, with a thickness / diameter between 1/8” (3.175mm) and 1/4” (6.35mm).
Some types of string (i.e. yarn) when measured under no tension on the original spool of string are within the specified tolerance of R7e. However, when the string is placed under a small amount of tension when used on a robot mechanism, the string becomes smaller than a diameter of 1/8”.
Under what circumstances should string/rope be measured to ensure it falls within the tolerance of R7e? Does string/rope need to be rigid enough such that it does not deform below tolerance at all points on the string?
Thank you for your time!