May 2, 2023

Indicator Selection and Setup Tips

By: Starrett
  • Choose the accuracy and readout needed – don’t select .0001" (0.001mm) readout if .001" will do the job.
  • Electronic/ Digital styles are best when the measurement data need to be collected, printed out or stored for future use.
  • Basically, all dial indicators used worldwide fall into the following size ranges which relate to bezel diameters: Size 0 is a smaller dial indicator, having its own dimensions. Sizes 1 through 4 are AGD sizes. These sizes and the AGD dimensions are essentially the same for all manufacturers, except as noted.
  •  Accuracy: All indicators should be “loaded” 1/8-1/4 of a turn before testing or measuring. Most accuracies are specified plus or minus one graduation over the full range. This basically means a 2 ½ turn range. Longer ranges have slightly wider tolerances. AGD specifies 2 1/3 turn indicators to cover any particular range. The reason for this is an effort to get the most out of the indicator – the operator “loads” it to about 1 1/3 turns and sets zero on the master. The indicator will now show the accurate deviation for a full revolution, plus or minus.