Boots – shoes – and leggings
Patent
1988-07-07
1990-06-12
Smith, Jerry
Boots, shoes, and leggings
36447437, 36447412, 408 13, 408147, 408156, 408173, B23B 5100, G01B 702
Patent
active
049338684
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to rotary cutting tools, more specifically to tools comprising a body having an axis of rotation, a tool bit support supported on the body for displacement relative thereto and transversely to said axis. The invention also relates to the combination of such a tool with a machine having a spindle to which the tool is securable for performing a cutting operation on a workpiece.
BACKGROUND OF THE INVENTION
It is known to provide a rotary cutting tool having a cutting radius adjustable by a motor. However, the adjustment of the cutting radius is controlled by a control external of the tool. A dedicated form of connection between the spindle of the machine tool to which the tool is connected, and the tool itself is thus required to transmit the control signals to a motor, in order to cause the motor to effect adjustment of the tool. Such tools are not therefore retrofittable into the spindles of existing machines. Moreover machine tools with dedicated connections on the spindle are expensive to manufacture.
SUMMARY OF THE INVENTION
A first aspect of the present invention provides a rotary cutting tool for mounting on a spindle of a machine tool. A base for attaching the tool to the spindle of the machine tool, the base having an axis of rotation. A support is provided for a tool bit, the support being connected to the base. The support is displacable perpendicular to the axis of the base and means are provided for determining the magnitude of displacment of the support. The cutting tool includes a receiver for position demand data, which data relates to the magnitude of the displacement of the support. A motor is provided for displacing the support perpendicular to the axis of the base. A tool controller is included for actuating the motor in accordance with the position demand data.
It is generally an object of this invention to provide a said tool having its own independent means of adjusting the position of the tool bit support relative to said axis and to provide a method of operating a machine in which such a tool is provided. The scope of the invention is specified in the claims hereto.
BRIEF DESCRIPTION OF THE DRAWING
An example of the different aspects of this invention and modifications thereof will now be described with reference to the accompanying drawings wherein
FIG. 1 is a part-sectional elevation of a part of a boring machine and a boring tool connected thereto,
FIG. 1a is a part view of the movable member of FIG. 1,
FIG. 2 is a part view of the machine similar to FIG. 1 but shows a probe attached to the machine,
FIG. 3 is a diagram showing positions of a bit of the boring tool to an enlarged scale,
FIG. 4a to 4e are a flow diagram of computer operations,
FIG. 5 is a system diagram,
FIG. 6 shows a detail of FIG. 1 embodying a modification,
FIG. 7 is a section on line VII--VII in FIG. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, there is shown a boring tool 30 connected by a taper 31 to a spindle 10 which is supported for rotation about an axis 10A and for translation in directions X,Y,Z, all relative to a workpiece 12. The spindle 10 is part of a machine including a first computer 20 for controlling the movements of the spindle and for other purposes to be described. The machine, being well-known per se, is not illustrated other than in the system diagram of FIG. 5 which shows a spindle positioning system 14 comprising the computer 20, a machine drive 15 being motors for effecting the movements of the spindle 10 relative to a datum which may be a surface of the workpiece 12, and a machine measuring system 16 for monitoring the position of the spindle.
The tool 30 comprises a cutting bit 32 having a tip 33. The bit 32 is secured to a member 34 through the intermediary of a piezo element 35 adapted to produce an output signal 35A when the tip 33 engages a gauge 11 or the workpiece 12. Thus the bit 32 also constitutes a sensing member for sensing forces acting on it and the piezo element constitutes a transducer for those
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Gordon Paul
Renishaw plc
Smith Jerry
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