Maag Gear-wheel & Machine Company Limited

Meinrad Donner

Peter Bloch

Eduard Mischler

Guy-Francois Blanc

Roman Schwaighofer

Heinz E Ruffner

Otto Schneider

Milton M Mesey

Roman Shcwaighofer

Urs Walliser

Hans Spath

The dressing tool is mounted on a cross-slide so as to be displaceable in parallel and normally with respect to the working surface or face of the grinding wheel which is to be dressed. After each dressing operation the grinding wheel is re-adjusted so as to be repositioned in a defined plane. A displacement measuring system is operatively coupled to the grinding wheel in order to measure the amount of such re-adjustment or adjustment. A difference observed between the desired amount of dressing and the measured amount of adjustment indicates the extent of wear of the dressing tool. The dressing tool is then correspondingly further adjusted and the grinding wheel is subjected to a further dressing operation.

Apparatus for compensating for dressing tool wear during the dressing of

In order to eliminate undulation errors in gear production wherein a generating motion of a gear-tooth flank of a gear fixed to a rotary table corresponding to an involute profile is induced by simultaneously imparting a predetermined rotary motion and a predetermined translatory motion to the rotary table, a reference ratio of these two speeds is determined, the momentary speeds of the table are measured and a momentary ratio is determined therefrom. A difference value is formed between the reference ratio and the momentary ratio. This difference value is first formed for each gear-tooth flank during one revolution and then stored in association with the momentary generating position of the gear and with the momentary stroke position of the gear-fabricating tool and only when the same gear-tooth flank is reached during a further revolution is the adjustment value of the gear-fabricating tool corrected by means of the stored difference values.

Method and apparatus for eliminating undulation errors on gear-tooth

The grinding wheel is axially displaceable by means of an axial drive for material removal or cutting operations and tooth flank corrections. The axial drive comprises a double-acting hydraulic piston-cylinder unit, the piston of which is formed at a spindle sleeve of a grinding wheel spindle and the cylinder of which is formed in a carrier or support sleeve. The cylinder is controllable by a servo-valve. A displacement or path measuring device is operatively associated with the spindle sleeve. The servo-valve as well as the displacement or path measuring device are connected to a displacement or path detection circuit which is connected to a program or operating control. There is thus realized a particularly sensitive and precise adjustment for the material removal or cutting operations and the tooth flank corrections.

Gear grinding machine including a double-cone shaped grinding wheel

Method of compensating for dressing tool wear during the dressing of

A grinding wheel contains two ring-shaped flanks and is axially displaceable by an axial drive. A radial slide is radially adjustably displaceable relative to the grinding wheel by a radial drive. Both of the displacements in axial and radial direction can be measured by a respective displacement path measuring device. Two dressing tools can be independently reciprocatingly displaced between an operative position and a wear measuring position at the radial slide. A wear measuring device is arranged at the radial slide for measuring in a direction extending substantially parallel to the grinding wheel axis the wear of the dressing tools. The relative displacement in the direction of the grinding wheel axis is governed by the desired flank profile, and a control increases such relative displacement in the direction of the grinding wheel axis by the amount of the wear of the dressing tools.

Profiling apparatus for a grinding wheel in a gear grinding machine

The protective cutoff device includes a cutoff control and a cutoff valve system connected to an automatic position control which is present anyway in the gear wheel grinding machine serving for topological flank correction grinding and to an adjusting cylinder, respectively. As a result, the grinding wheel is effectively disengaged from the tooth flank in the process of being ground in the event of electric power failure and/or pressure failure or an undesirable pressure drop or upon the occurrence of any other disturbance or malfunction of the grinding wheel. Therefore one side of the adjusting cylinder is connected to a return line and the grinding wheel carrier or support is displaced against a stationary stop by a force or pressure accumulator.

Protective cutoff device for a gear wheel grinding machine

A position regulation system containing a digital incremental measuring apparatus. The use of a discriminator and a computer allows the detection of long distances with high resolution, without counters or with only very short counters. The system is capable of automatically advancing to certain positions at a preselected speed or with preselected acceleration and of accordingly determining priorities for the positioning or adjustment magnitudes used for the advance.

Position regulation system containing a digital incremental measuring

A method of measuring errors in the rotational truth of gear teeth of a gear by means of a measuring device having a feeler guide which is pivotable about a pivot axis parallel to the gear axis, the feeler guide guiding a feeler which is prebiased in the direction of the gear and cyclically engages into the gear teeth as the gear rotates. The feeler together with the feeler guide is pivotable about its pivot axis and can be displaced back in relation to the feeler guide. An electronic circuit determines the largest degree of rearward displacement of the feeler during each measuring cycle in that it stores signals delivered by the feeler and compares such stored signals with one another. During each measuring cycle there is formed from a number of signals delivered by the feeler as well as from a number of subsequently delivered signals a respective mean value. Both mean values are compared with one another, the larger of such mean values, to the extent that it constitutes the mean value of the later signals is stored, and this procedure is repeated for such length of time until there is present a mean value which is smaller than the directly previously formed mean value, whereupon such previously formed mean value is delivered as the maximum value of the related measuring cycle.

Method of measuring errors in the truth of rotation of a gear

Gear pitch testing apparatus has a computer control for programming relative displacements between a gear and a pair of probes, and means for automatically comparing test data with stored reference values to indicate deviations in the gear under test. Initial setting of the apparatus for a test sequence requires the operator only to control the relative displacements of the gear and probes to synchronise them approximately, the coarse adjustment thus obtained then being automatically modified in an electronically controlled fine adjustment stage to co-ordinate the movement between the gear and the probes accurately and allow such characteristics as absolute cumulative pitch error to be evaluated.

Electronic pitch tester for gears

A gear testing apparatus has a probe or feeler biassed into engagement with a gear tooth flank for measurement of the flank. To lift the feeler from the tooth flank and/or to displace it to a further setting in which it can be used to measure an oppositely facing flank a mechanism is provided that requires only a momentary power input to effect the lifting or displacement. The apparatus is arranged to retain the feeler in its new setting when lifting or displacement has occurred and after said power input has been discontinued.

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Nuolen, Switzerland

Meinrad Donner