A screw gauge has a pitch of 1 mm and 100 circular divisions. It has a **negative** zero error of 0.03 mm. On a ball bearing, the linear scale shows 4 mm and circular division 45 is on the datum line. What is the diameter of the bearing, in micrometres?

PhysicsMediumHigh School (11–12)Mechanics › Units and Measurement

A screw gauge has a pitch of $1\ \text{mm}$ and $100$ circular divisions. It has a negative zero error of $0.03\ \text{mm}$ . On a ball bearing, the linear scale shows $4\ \text{mm}$ and circular division $45$ is on the datum line. What is the diameter of the bearing, in micrometres?

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