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Lockout calibration woes

Q: I acquired a lockout-type stringing machine a little more than four years ago. I’ve been using it to string racquets for my clients who specifically request lockout tensioning, as my main machine is a constant-pull electronic machine. I have always calibrated the lockout machine every two stringing jobs as the calibration can be off by as much as .25 of a pound. Do you have any suggestions that will help keep the machine in calibration longer?

A: First, experiment with different types of string attached to the calibrator, as some machines calibrate better with one type of string compared to another.

Second, check to see that the calibration adjustment screw is snug in the housing. If not, you might try removing it, cleaning the threads as best you can, and then reinstalling it with some heavy grease, so it doesn’t rotate out on its own.

Third, always adjust calibration from low to high. This means that if you adjust the calibration too high, you’ll have to turn it down past the adjustment point, and then back up to what you want, rather than just adjusting it down to the spec.

From the July 2006 issue
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