I think 4 times more accurate as a minimum.With typical length tolerances of ± .015 / 0.39mm what would be an acceptable calibration accuracy of a 60" linear measuring device?
I would Calibrate it where you are using it on the scale. Measuring +/-.015" over 60" with a steel rule is tight.That is what I thought as I do not see a need for 10x with the intended use. Do you spread that 4x over the entire 60"? In other words I am checking every 5" so would the 4x be every 5"? I have always outsourced the calibration of these units believing they were actually being calibrated Anyway I have purchased grade blocks and will bring the calibration in house hence the questions.
55" measures at +.001 which is more than acceptable for our process.
His stated tolerance in the op is +/-.015 inches, not mm. I think qcman is stating it in inches.Pretty sure you just answered your own question...with the "more than acceptable for our process" statement....however...
Math says +0.001" = 0.0254mm (assumed inches since you didn't state units on 0.001)
Tolerance 0.015mm / 4 = 0.004mm
Math says it's not good enough...assuming I assumed units correctly.
With typical length tolerances of ± .015 / 0.39mm