#### Two Categories of Runout: Circular or Total

There are two categories for runout:

- Circular Runout measures just one circle—one row of hits—around the cylinder.

- Total Runout measures multiple circles up and down the entire surface of the cylinder with multiple rows of hits.

Obviously, you are somewhat limited using a CMM for total runout because you probably will not take 100 rows of hits around your cylinder, and something as little as 3 rows of hits clearly isn’t enough for determining total runout.

Nevertheless, PC-DMIS provides you with the ability to dimension both circular and total runout and lets you determine whether or not you've measured enough rows of the cylinder.