Grinding system

A grinding system for grinding a plurality of pairs of crankpins axially symmetrically spaced on a crankshaft so that when the crankshaft is turned end for end the axial location of each pair of crankpins may be unchanged comprising

• a cylindrical grinding machine for each pair of axially symmetrically spaced crankpins, each for grinding a crankpin located at a distinct radial and axial position,
• means for depositing a crankshaft having both crankpins of each pair of axially symmetrically spaced crankpins unground at a selected start location,
• means for displacing the crankshaft having both crankpins of each pair of axially symmetrically spaced crankpins unground from the selected start location sequentially to each of said grinding machines and to an end location so that one crankpin of each crankpin pair will be ground,
• means for transferring the crankshaft, with one crankpin of each crankpin pair ground, from said end location to said start location and for axially symmetrically turning the crankshaft end for end, and
• means for displacing the crankshaft having one crankpin of each pair of axially symmetrically spaced crankpins ground from the start location sequentially to each of said grinding machines and to said end location so that the second crankpin of each crankpin pair will be ground.