Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1974-04-15
1976-03-23
Schran, Donald R.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
82 2B, 318571, B23Q 1104, G05B 500
Patent
active
039452972
ABSTRACT:
A simple method and apparatus is disclosed for the calibration of a numerically controlled milling machine or the like, to determine the compliance for a particular set-up of the machine. The apparatus includes a hydraulic cylinder mounted on the machine bed, with the end of the hydraulic piston bearing against a non-rotating cutting tool that is mounted in the spindle. A pressure gauge or pressure switch indicates fluid pressure in the hydraulic cylinder to determine force of the piston on the cutting tool, and a deflection sensor measures the static deflection of the spindle. In one apparatus, hydraulic fluid from a high pressure source passes through a pressure-reducing valve into the rear of the hydraulic cylinder to push the piston rod end against the cutting tool, without requiring motion of the spindle relative to the bed, the valve being adjusted to maintain a desired fluid pressure behind the piston despite leakage of fluid past the piston.
REFERENCES:
patent: 2498881 (1950-02-01), Eldridge, Jr.
patent: 3602090 (1970-02-01), Whetham
patent: 3698268 (1972-10-01), Cutler
patent: 3746955 (1971-03-01), Kobayashi
Allen-Bradley Co.
Schran Donald R.
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