Patent US3764786A successfully refreshed from Google Patents.
US3764786A
Expired / Lapsed
US
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Cutter diameter compensation for numerical control machine tools
Assignee: Rohr Inc
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Filing: 1972-05-05
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Granted: 1973-10-09
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Expires: 1992-05-05
Abstract
Abstract Each time the rotary bit of a milling machine is sharpned, the diameter of the bit is reduced and the spindle carrying the bit must be shifted with respect to the workpiece. Where the path of the spindle is defined by a record or ''''program'''' of binary numbers on a punched tape or on a magnetic drum or disc, a different program must be composed for each bit size. This invention obviates all of the many programs and most of the computer memory storage. A program for the maximum and minimum cutter bit diamters, only, are composed and stored and the readout of these two values are combined in a fixed ratio n and applied to the controls of the machine tool.
Inventors
- 👤 V Vawter
- 👤 W Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:22
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/25; G05B19/251; G05B2219/00; G05B2219/30; G05B2219/50; G05B2219/50334
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
The method of compensating for tool wear in a programmed numerically controlled machine tool, said method comprising the steps of generating and storing a first and second set of numbers corresponding, respectively, to the X, Y and Z coordinates of separate programmed paths (P1 and P2) of machine tools of two different predetermined dimensions, simultaneously reading out like numerical bits of the two mentioned numerical programs, combining the quantitive values of the read-out numbers to produce a number which is a fixed ratio n of the difference between the numbers corresponding to said two dimensions, and applying the resultant number to said machine tool.
Claim 2
Independent Claim
104 words
The method of compensating for tool wear in a programmed numerically controlled machine tool, said method comprising the steps of generating and storing a first and second set of numbers corresponding, respectively, to the X, Y and Z coordinates of separate programmed paths (P1 and P2) of machine tools of two different predetermined dimensions, simultaneously reading out like numerical bits of the two mentioned numerical programs, combining the quantitive values of the read-out numbers to produce a number which is a fixed ratio n of the difference between the numbers corresponding to said two dimensions, and applying the resultant number to said machine tool.
Claim 3
Dependent Claim
48 words
In the method defined in claim 1 said step of combining the mentioned read-out numbers consisting of applying voltages corresponding to said numbers to opposite ends of a potentiometer and setting the sliding contact of said potentiometer a distance from one end corresponding to said ratio number n.
Claim 4
Dependent Claim
47 words
In the method defined in claim 1 said step of simultaneous read-out comprising sensing the actual position of the cutting tool and generating a voltage corresponding to said actual position feeding back said actual position voltage to discriminators for combining with the read-out of said two programs.
Claim 5
Dependent Claim
62 words
In the method defined in claim 1 said first and second sets of numbers comprising coded binary bits, said method further comprising applying both sets of numbers to a plus-minus counter so that the counter contains the difference between said two sets of numbers, multiplying the difference number by a multiplying factor n and applying the resultant number to said machine tool.
Claim 6
Dependent Claim
105 words
In combination with a machine tool having a spindle and a replaceable rotary cutting tool, a computer comprising two stores adapted to contain, respectively, numerical information comprised of X, Y and Z coordinates for defining the paths of cutting tools for machining a workpiece of predetermined size and shape, means for simultaneously reading out from said stores corresponding portions of the numerical information, and means for combining each read-out portion with feedback actual tool position information to produce error signals e1 and e2, combining said signals in the portions, respectively, of n and 1 - n and applying the combined signal to said machine tool.
Claim 7
Dependent Claim
105 words
In combination with a machine tool having a spindle and a replaceable rotary cutting tool, a computer comprising two stores adapted to contain, respectively, numerical information comprised of X, Y and Z coordinates for defining the paths of cutting tools for machining a workpiece of predetermined size and shape, means for simultaneously reading out from said stores corresponding portions of the numerical information, and means for combining each read-out portion with feedback actual tool position information to produce error signals e1 and e2, combining said signals in the portions, respectively, of n and 1 - n and applying the combined signal to said machine tool.
Claim 8
Dependent Claim
43 words
In the combination defined in claim 5, said means for combining comprises a potentiometer, opposite ends of which are, respectively, coupled to the sources of said error voltages e1 and e2 and the adjustable contact of which is coupled to said machine tool.
Claim 9
Dependent Claim
44 words
In the combination defined in claim 5, said stores each comprise a register for holding binary coded decimal numbers, said means for combining comprises a plus-minus counter for algebraically adding said numbers, and a binary multiplier coupled between said counter and said machine tool.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |