How to Measure the Bore of a Hydraulic Cylinder

Hydraulic cylinders are found in automobiles, boats and other large equipment. Hydraulic oil or another pressurized fluid powers the cylinder and forces a piston located inside a barrel to move back and forth. The inner diameter of the barrel, where the piston moves, is known as the bore, and is a critical measure for the operation of the hydraulic cylinder. The lifting force of a cylinder is based on the size of the bore diameter multiplied by the hydraulic pressure. Measure the bore of a hydraulic cylinder to help calculate generated force.

Instructions

1

Disassemble the cylinder so that the bore is accessible. The exact procedure depends on the type of hydraulic cylinder. Clean any fluid from inside.

2

Twist the ratchet on the end of the telescopic bore gauge until the anvil and head are slightly larger than the opening in the bore.

3

Place the opened anvil and head against the bores opening at a gentle angle. Slowly straighten the bore gauge until the base of the instrument stands vertical and the head and anvil touch opposite sides of the bore wall. Rock the gauge gently in the bore to lock the anvil in place.

4

Remove the telescopic bore gauge from the bore. Measure the distance between the head and anvil with a micrometer or caliper to determine the diameter of the bore.