Gear cutting – milling – or planing – Milling – With limit means to aid in positioning of cutter bit or work
Patent
1983-05-12
1985-07-16
Briggs, William R.
Gear cutting, milling, or planing
Milling
With limit means to aid in positioning of cutter bit or work
73104, 356391, 409 63, B23C 900
Patent
active
045293449
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a setting device for cutter heads with a rotatingly mounted cutter head holder, a base support frame and an optical scanning apparatus with a projection screen to detect the profile of one cutting edge at a measuring point.
Setting devices of this type are used for the setting of cutter heads, in particular of multiple edge milling tools with individually adjustable cutting bits.
In known setting devices, the cutter head holder is mounted on a rotatingly supported spindle, fixedly mounted on the frame. The optical scanning apparatus is adjustable, so that the measuring point, which corresponds to the zero point of a graticule on the projection screen, may be brought into a definite initial position with respect to the axis of rotation of the cutter head.
The unavoidable rotational inaccuracy of the cutter head holding spindle has a considerable effect on the rotating accuracy and the axial run-out accuracy of the cutter head detected and scanned. In the case of axial run-out accuracies of the order of magnitude of 0.001 mm, which is often required, these known setting devices no longer yield satisfactory results. Furthermore, the measuring point, in which simultaneously the setting of the individual cutting bits must also be effected, is accessible with difficulty only.
It is therefore the object of the invention to provide a setting device of the aforementioned type, whereby the axial runout error caused by a holder spindle or the like, is extensively avoided. Simultaneously, the measuring point should be readily accessible for the adjustment of cutting edges. The device should have a simple and stable configuration.
This object is attained according to the invention by the following characteristics: stationarily with respect to the frame and with an approximately horizontal direction of the optical beam; manner; with respect to the measuring point; cutter head.
The rotatable cutter head holder here serves only to determine the radial position of the cutter head and to make possible the rotating motion between the individual setting processes. The axial run-out setting, which is increasing in importance in the adjustment of the cutter head and which has very accurate requirements, is determined not by the rotating accuracy and the axial run-out accuracy of the rotatable cutter head holder, but by the position of the three support bodies, resting against the rear side of the cutter head. This takes into account the fact that this rear side of the cutter head forms the supporting surface of the cutter head on the frontal surface of the support flange of the machine tool. The axial run-out accuracy of the cutter head is thus determined by the position of the edges with respect to the said rear side of the cutter head. The supporting of the rear side of the cutter head by three supporting bodies renders it possible to sight the cutter head with a very high accuracy in the setting device, without a potential axial run-out error or rotating error of the rotating cutter head holder affecting the axial run-out accuracy of the cutter head. A further increase in the accuracy and simplification of the configuration of the apparatus is obtained by the stationary mounting of the optical scanning apparatus. The necessary radial end axial setting of the milling tool to be scanned in relation tn the measuring point is effected by that the support stage is adjustable in height in the base frame at least within the range of the measuring point and that the cutter head holder is displaceable with respect to the support stage. The measuring point, at which the cutting bit setting is also accomplished, is located in a readily accessible position on the front side of the setting device.
According to an especially advantageous form of embodiment of the concept of the invention, it is provided that the rotatable cutter head holder and at least two of the three support bodies are guided displaceably in the support stage. This makes it possible in a very simple manner and without interfering with accuracy, t
REFERENCES:
patent: 3582214 (1971-06-01), Loomis
How to Preset Tools, American Machinist Special Report No. 531, pp. 131-142, Nov. 1962.
Briggs William R.
Santrade Ltd.
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