By Mahesh Chander Gupta
Like other instruments, engineering-grade ruled scales require traceable calibration. Because the calibration is usually carried out by sophisticated comparators that are expensive to buy and maintain, only a handful of laboratories are equipped to perform in-house calibration. In view of the high demand for calibration of grade 1 and 2 length scales, Dubai Central Laboratory has developed an inexpensive, easy-to-operate system that can be readily assembled by utilizing available equipment. The arrangement is suitable for graded length scales of grade 1 and 2 used routinely on shop floors for precision work requiring accuracy of 0.15mm to 0.25mm. This paper describes some important feature of the system.