Datum reference for tool touch probe system
US4554495A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1984 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Aug 29, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23Q17/2241
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A reference post assembly (50) directly mounted on a numerically controlled machining system such as a lathe obviates the need for a datum ring including reference datum surfaces (42,44) and being conventionally provided on the external cylindrical surface and face of a chuck (36) which holds the workpiece (41) being machined. The reference post assembly (50) is comprised of an elongated reference post member (52) of selected cross section, i.e., square or round, which is resiliently mounted on the lathe in a known calibrated position with respect to the workpiece (41). The post (52) is ultrasonically vibrated in a longitudinal mode by one or more piezoelectric elements (54) coupled to an electrical signal oscillator (56). A frequency matched vibration sensor (72) in the form of an accelerometer is mounted on a machine tool carrying turret (26) and is adapted to sense the vibration imparted to the reference post when a machine tool (32) utilized as a touch probe is brought into contact with the reference post. The signal output of the accelerometer ( 72) is fed from the turret (26) by a rotating coupler (74) where it is conditioned and thereafter fed to a numerical control unit (46…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.