GB843510A - Spark controlled measuring device - Google Patents

Spark controlled measuring device

Info

Publication number
GB843510A
GB843510A GB3161657A GB3161657A GB843510A GB 843510 A GB843510 A GB 843510A GB 3161657 A GB3161657 A GB 3161657A GB 3161657 A GB3161657 A GB 3161657A GB 843510 A GB843510 A GB 843510A
Authority
GB
United Kingdom
Prior art keywords
probe
motor
spark
voltage
pointers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3161657A
Inventor
George Herbert Vale
Brian Edwin Ringrose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB3161657A priority Critical patent/GB843510A/en
Publication of GB843510A publication Critical patent/GB843510A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/34—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces
    • G01B7/345—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces for measuring evenness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

843,510. Determining physical dimensions. ROLLS-ROYCE Ltd. Nov. 12, 1958 [Oct. 9, 1957], No. 31616/57. Class 37. Measuring apparatus comprises a probe axially movable by a motor and means for applying a voltage between the probe and the tested member to produce a spark, variations in the spark resistance being used to control the motor so as to maintain the length of gap constant and means to indicate the position of the probe. Fig. 1 shows a body 12, the contours of which are being determined.' The probe 10 is carried by a member 11 movable by means of a lead screw 13, driven by a two phase induction motor 18 via a gear train. The position of the probe and hence the dimensions of the body 12 is indicated by fine and coarse pointers 25, 28. Fig. 2 (not shown) relates to another arrangement contained in a cylindrical casing, in which the motor is mounted vertically. The fine and coarse pointers are replaced by two revolution counters, used respectively to indicate upward and downward movement relative to a datum, shutters being provided to obscure the counter not in use. Fig. 7 shows a motor control circuit, in which the resistance of the spark gap 17 is measured in a bridge circuit fed from winding 57 of a transformer. The bridge unbalance voltage is amplified by a phase splitter 80c and the tuned push-pull amplifier 65, 66 before being fed to the motor 18. Stabilizing feedback is provided by an alternating current tacho-generator 29 the output of which is amplified by valve 80d. In Fig. 4, (not shown) a long-tailed pair type of phase splitter is used. Fig. 3 (not shown) relates to the use of a long-tailed pair type of power amplifier. An alternative probe construction is shown in Fig. 5. The lead screw 13b is journalled in ball races 88 and turns a spindle 81 threaded into a sleeve 81a slidable within the housing 83. Backlash is prevented by a nut 86 and spring 87. A terminal 93 makes sliding contact with a rod 94 which carries the voltage from winding 57 via a resistor 68 to the platinum ball 97 forming the end of the probe. Reference is made to the use of the invention in place of a micrometer or for measuring moving objects such as cams.
GB3161657A 1957-10-09 1957-10-09 Spark controlled measuring device Expired GB843510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3161657A GB843510A (en) 1957-10-09 1957-10-09 Spark controlled measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3161657A GB843510A (en) 1957-10-09 1957-10-09 Spark controlled measuring device

Publications (1)

Publication Number Publication Date
GB843510A true GB843510A (en) 1960-08-04

Family

ID=10325810

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3161657A Expired GB843510A (en) 1957-10-09 1957-10-09 Spark controlled measuring device

Country Status (1)

Country Link
GB (1) GB843510A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154324A (en) * 1984-02-15 1985-09-04 Derek Harry Graddon Redman Improvements to dynamic measuring system
GB2312957A (en) * 1996-05-09 1997-11-12 Rotadata Ltd Alternating current spark discharge probe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154324A (en) * 1984-02-15 1985-09-04 Derek Harry Graddon Redman Improvements to dynamic measuring system
GB2312957A (en) * 1996-05-09 1997-11-12 Rotadata Ltd Alternating current spark discharge probe

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