Machine handles mount to machine tools and are used to make manual adjustments to the machines. Adjustable machine handles can be rotated to adjust machine tool positioning, clamping force, and workholding. Cam handles apply clamping force to join together machine tool components or workpieces. Crank handles provide leverage for turning or tightening machine tool components that require frequent adjustment and repositioning. Lever handles manage on/off operations, adjust gears, and open and close hydraulic valves.