US4662074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining precision of numerically controlled machine tool devices
Assignee: Meseltron SA
•
Filing: 1983-09-15
•
Granted: 1987-05-05
•
Expires: 2003-09-15
Abstract
Abstract A system for determining the precision of a numerically controlled machineool involves setting the machine tool control to define a circular path. A circular standard is then aligned with the machine tool to sense the desired circular path. A continuous or pointwise sensing, as a function of whether a path-controlled or a point-by-point-controlled machine is being measured, of the aligned standard is performed. A faulty machine tool does not accurately cover the defined circular path. Variations from the desired circle can be plotted and used for evaluation.
Inventors
- 👤 Wolfgang Knapp
- 👤 Stojan Hrovat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:52
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/28; G01B7/282; G01B7/004; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37207
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
132 words
A method for determining geometrical precision of numerically controlled machine tool or measuring apparatus, comprising the steps of: arranging a standard in a plane including the path along which a tool of the apparatus moves; mounting a 2D sensor having an axis of rotational symmetry in a tool mount of the apparatus such that the axis of rotational symmetry is essentially normal to said plane and the sensor is restrained against rotation about the axis of rotational symmetry relative to the apparatus; detecting said standard in at least two different directions with said sensor which is moved by the apparatus in a step-by-step pattern about said standard to effect a translation in said plane; and comparing measurements obtained from said sensor with predetermined geometric values stored in control means for the apparatus.
Claim 2
Independent Claim
132 words
A method for determining geometrical precision of numerically controlled machine tool or measuring apparatus, comprising the steps of: arranging a standard in a plane including the path along which a tool of the apparatus moves; mounting a 2D sensor having an axis of rotational symmetry in a tool mount of the apparatus such that the axis of rotational symmetry is essentially normal to said plane and the sensor is restrained against rotation about the axis of rotational symmetry relative to the apparatus; detecting said standard in at least two different directions with said sensor which is moved by the apparatus in a step-by-step pattern about said standard to effect a translation in said plane; and comparing measurements obtained from said sensor with predetermined geometric values stored in control means for the apparatus.
Claim 3
Dependent Claim
80 words
A method according to claim 1 wherein a circular path is stored in said control means of the apparatus; said standard is arranged to define a circle in transverse cross section in said plane, said circle corresponding to said circular path; said sensor measures said standard in at least two directions in said plane; and electrical sensing signals produced by said sensor are compared with predetermined values of electrical signals corresponding to said circular path produced by said control means.
Claim 4
Dependent Claim
84 words
A method according to claim 2 wherein said circular path is defined by electrical signals such that a currentless level corresponds to the center of the circle of the transverse cross section of said standard; said sensor mechanically senses said standard in said plane and produces electrical signals correlated with geometrical dimensions of the apparatus; and the signals produced by said sensor are combined with signals corresponding to the geometrical dimensions of said sensor to produce new signal representing geometrical dimensions of the apparatus.
Claim 5
Dependent Claim
94 words
A method according to claim 1 wherein a circular path is stored in said control means of the apparatus; said standard is arranged to define a circle in transverse cross section in said plane, said circle corresponding to said circular path; said sensor measures said standard in at least two directions in said plane; electrical sensing signals produced by said sensor are plotted as a first curve on a recording base with a second curve corresponding to said circular path; whereby the measurements from said sensor can be optically compared with said circular path.
Claim 6
Dependent Claim
19 words
A method according to claim 4 wherein said first curve, compensating for error, and said second curve are concentric.
Claim 7
Dependent Claim
14 words
A method according to claim 1 wherein said standard has an outer cylindrical surface.
Claim 8
Dependent Claim
14 words
A method according to claim 1 wherein said standard has an inner cylindrical surface.
Claim 9
Dependent Claim
14 words
A method according to claim 1 wherein said standard has a stepped cylindrical surface.
Claim 10
Dependent Claim
11 words
A method according to claim 1 wherein said standard is spherical.
Claim 11
Dependent Claim
24 words
A method according to claim 1 wherein said standard is detected by the sensor in the two different directions simultaneously at each detection point.
Claim 12
Independent Claim
110 words
An apparatus for determining geometrical precision of numerically controlled machine tool or measuring devices, comprising: a standard arranged in a plane including the path along which a tool of the device moves; 2D sensor means, mounted in the device, for measuring said standard in at least two different directions in said plane, said sensor means having an axis of rotational symmetry essentially normal to said plane, and being movable in a step-by-step pattern about said standard by the device to effect a translation in said plane and restrained against rotation about said axis of rotational symmetry in the device; and means for analyzing the signals produced by said sensor means.
Claim 13
Independent Claim
110 words
An apparatus for determining geometrical precision of numerically controlled machine tool or measuring devices, comprising: a standard arranged in a plane including the path along which a tool of the device moves; 2D sensor means, mounted in the device, for measuring said standard in at least two different directions in said plane, said sensor means having an axis of rotational symmetry essentially normal to said plane, and being movable in a step-by-step pattern about said standard by the device to effect a translation in said plane and restrained against rotation about said axis of rotational symmetry in the device; and means for analyzing the signals produced by said sensor means.
Claim 14
Dependent Claim
14 words
An apparatus according to claim 11 wherein said standard has an outer cylindrical surface.
Claim 15
Dependent Claim
14 words
An apparatus according to claim 11 wherein said standard has an inner cylindrical surface.
Claim 16
Dependent Claim
11 words
An apparatus according to claim 11 wherein said standard is spherical.
Claim 17
Dependent Claim
15 words
An apparatus according to claim 11 wherein said sensor means is a two-dimensional 2D sensor.
Claim 18
Dependent Claim
23 words
An apparatus according to claim 11 wherein said sensor means measures said standard in the two different directions simultaneously at each measurement location.
References Cited (Backward Citations)
US3400463A
Cited
US3259989A
Cited
US3432932A
Cited
US3481043A
Cited
US3615143A
Cited
US3826011A
Cited
US3950858A
Cited
US4070762A
Cited
US4389789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |