How to Use a Dial Indicator to Check Runout and TIR
Learn how to mount the base, read the swing, and spot eccentricity before releasing the job.
A small measuring mistake can reject a good part or release a bad one. Start with How to Use a Dial Indicator to Check Runout and TIR, then check zero, contact point, hand force, and reading method before deciding whether the part passes.
What to Check
- a dial indicator is used to check runout, set workpieces, and find high and low spots
- the magnetic base must be stable, and one full rotation helps show the true swing range
- if the reading swings too much, identify whether the issue comes from the chuck, holder, or part
How to Apply It on the Shop Floor
On the shop floor, measure with a fixed sequence. Do not pick up the tool and trust the first number. Clean, zero, choose the correct feature from the drawing, then repeat the reading. If the value moves too much, find the cause before averaging it away.
Important Cautions
This article is a practical use and checking guide. It does not replace your work instruction, calibration procedure, or quality system. For tight tolerances or critical customers, compare against a master and follow the required calibration schedule.