GB Patent: GB-437,770
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| Improvements Relating to Gear Profile Testing Machines
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Patentee:
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| Michigan Tool Co. (exact or similar names) - Detroit, Wayne County, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 04, 1933 |
| Granted: |
Nov. 05, 1935 |
Espacenet patent
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Joel Havens
"Vintage Machinery" entry for Michigan Tool Co.
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Description: |
| Abstract:
The machine is provided with work-holding means, gauging means movable rectilinearly tangentially to the base-circle or like datum of the work, a fixed ratio train of interconnection between the work and the gauging means, and an angularly adjustable transmitting member for compensating for difference ratios between the size of the work and the movements of the gauging means. The gear 72 is supported on a shaft 71 between an upper axially adjustable centre 23 and a lower rotatable chuck 67 journalled in the framework. The chuck can be freed from its spindle, the lower end of which carries an arcuate friction element 22 against which bears a straight bar 21 held against the element by eccentrically adjustable rollers 64. This bar moves solidly with a sine bar 18 on a carriage 15 supported on ball bearings in V-tracks 13 on the machine body, the carriage being moved by turning a hand wheel 14 having a calibrated index. The sine bar 18 is a straight bar mounted for angular adjustment on the carriage to an extent determined by the ratio between the base circle of the gear under test and the diameter of the arc of the friction element 22. Upon tracks similar to but at right angles to the carriage tracks is mounted an indicator carriage 24 acted upon by a counterpoise which holds the carriage so that a nose 26 on the latter engages the sine bar. The carriage has mounted upon it an indicator head vertically adjustable in an upstanding bracket 32 which is transversely movable by a manually-operated threaded spindle 29 upon a sub-carriage 27 longitudinally movable on the carriage engaging the sine bar. The work is set up and the sine bar adjusted angularly. The feeler 32 is then adjusted to contact with the base circle of the gear. Then, when the wheel is turned to move the sine bar carriage a given amount, the gear is rotated through a required angle and the feeler is correspondingly moved and should, if the gear is correct, still contact with the same pressure. The gauges 55 on the gauging head indicate departure from this constant pressure. |
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