Abstract
For large gear with the characteristic of large structure, quality and modulus, its profile precision is usually measured by in-site measurement. Based on large gear on-machine measuring described, involute helicoid and its characteristic are studied. The definition of medium rack in the framework of gear meshing transmission is put forward, the scheme of on-machine measurement based on rack-shaped-edge probe is formed, which can be divided into rolled angle (phase angle) and pressure angle (meshing angle) measurement according to the rotation of gear and prob. Measurement grid is determined by measuring straight generatrix deviation of gear profile, furthermore total tooth profile deviation and total helix deviation are separated.
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