Might be a terminology issue, but don’t confuse calibration with resetting the chains. Calibration is used to adjust the parameters that are used to convert x,y to chain lengths… such as distance between motors, rotational radius, chain tolerance. These don’t normally change over time. Resetting the chains back to known lengths does not require you do recalibrate.
https://forums.maslowcnc.com/t/how-to-manually-reset-chains-the-easy-way/9702/12