US4547996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jig grinder with automatic C-axis feedrate control
Assignee: FEDERAL DEPOSIT INSURANCE Corp AS RECEIVER BY RECOLL MANAGEMENT CORP ITS ATTORNEY-IN-FACT
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Filing: 1984-04-26
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Granted: 1985-10-22
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Expires: 2004-04-26
Abstract
Abstract A jig grinder is provided with a controller for computing, as a function of an established radius and a preset feedrate, a rotational speed for rotating the machine spindle to provide a uniform surface speed at the cutting edge of the grinding tool as the tool alternates between linear grinding with an X and/or Y axis and arc grinding along the C-axis of the spindle. A method is provided for grinding straight surfaces and adjoining arcs at a constant feedrate without interruption.
Inventors
- 👤 Dennis A. Winski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:52
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
A method for grinding straight surfaces and adjoining arcs at a constant feedrate without interruption comprising the steps of: coupling a grinding wheel to a spindle of a jig grinder; offsetting said grinding wheel from a center axis of said spindle to establish a radius "r" from the spindle axis to a cutting edge of said grinding wheel; mounting a workpiece to be machined to a worktable; moving said worktable at a preset feedrate "Fr(p)" along a straight path to effect grinding of a straight surface on said workpiece by said grinding wheel; computing, as a function of the established radius "r" and said preset feedrate "Fr(p)", a rotational speed for rotating said spindle to provide a uniform surface speed at the cutting edge of said grinding wheel as said wheel traverses said workpiece from a straight surface to an arc being ground; and stopping the work table and similtaneously rotating said spindle at the computed rotational speed when grinding an arc.
Claim 2
Independent Claim
162 words
A method for grinding straight surfaces and adjoining arcs at a constant feedrate without interruption comprising the steps of: coupling a grinding wheel to a spindle of a jig grinder; offsetting said grinding wheel from a center axis of said spindle to establish a radius "r" from the spindle axis to a cutting edge of said grinding wheel; mounting a workpiece to be machined to a worktable; moving said worktable at a preset feedrate "Fr(p)" along a straight path to effect grinding of a straight surface on said workpiece by said grinding wheel; computing, as a function of the established radius "r" and said preset feedrate "Fr(p)", a rotational speed for rotating said spindle to provide a uniform surface speed at the cutting edge of said grinding wheel as said wheel traverses said workpiece from a straight surface to an arc being ground; and stopping the work table and similtaneously rotating said spindle at the computed rotational speed when grinding an arc.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said rotational speed "Fr(c)" is computed in accordance with the formula: ##EQU8##
Claim 4
Dependent Claim
25 words
The method of claim 1 comprising a further step of stopping the rotation of said spindle concurrently with the commencement of movement of said worktable.
Claim 5
Dependent Claim
25 words
The method of claim 3 comprising a further step of stopping the movement of said worktable concurrently with the commencement of rotation of said spindle.
Claim 6
Dependent Claim
155 words
A machine tool comprising: a work holding table for linear movement along an X and/or Y axis at a preset feedrate "Fr(p)" for linear grinding; a spindle rotatable about a C-axis for arc grinding; a tool holder, having a receptacle for holding a grinding tool, mounted to said spindle; means for offsetting said receptacle from the center axis of said spindle to establish a radius "r" from the spindle axis to a cutting edge of the tool mounted in said receptacle; means for computing, as a function of the established radius "r" and said preset feedrate "Fr(p)", a rotational speed "Fr(c)" for said spindle to provide a uniform surface speed at the cutting edge of the tool as the tool alternates between linear grinding along said X and/or Y axis and arc grinding about said C-axis; and means for rotating said spindle about said C-axis to traverse an arc at said computed rotational speed "Fr(c)".
Claim 7
Dependent Claim
155 words
A machine tool comprising: a work holding table for linear movement along an X and/or Y axis at a preset feedrate "Fr(p)" for linear grinding; a spindle rotatable about a C-axis for arc grinding; a tool holder, having a receptacle for holding a grinding tool, mounted to said spindle; means for offsetting said receptacle from the center axis of said spindle to establish a radius "r" from the spindle axis to a cutting edge of the tool mounted in said receptacle; means for computing, as a function of the established radius "r" and said preset feedrate "Fr(p)", a rotational speed "Fr(c)" for said spindle to provide a uniform surface speed at the cutting edge of the tool as the tool alternates between linear grinding along said X and/or Y axis and arc grinding about said C-axis; and means for rotating said spindle about said C-axis to traverse an arc at said computed rotational speed "Fr(c)".
Claim 8
Dependent Claim
24 words
The machine tool of claim 5 wherein said computing means determines the rotational speed "Fr(c)" for said spindle in accordance with the formula: ##EQU9##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |