Gear Testing Machine Parkinson Type Gear testing bench is a combination of Parkinson gear testing at one end of the machine bed and Orcutt involute testing at the other end of the machine. Specification Seasoned hardened and ground cast iron bed Hardened hard chrome plated and ground mandrels to suit master gear and test gear. Dial gauge with least count of 0.01mm range 10mm. One Set of gear. Test gear (spur) Ground pitch circle diameter blank Qty :