The heart of a hydraulic piston pump, called a cylinder block or rotor, starts as a turned blank up to eight inches diameter. Then, nine circumferential piston bores from 0.1875 to 1.5 in. (4.8 - 38.1 ...
When drilling very deep holes, it’s important to allow enough stock for clean up after a worst-case runout of 0.001 in. per inch. A part that is 180 in. long should allow more than 0.180 in. for clean ...