GB549987A - Improvements in or relating to the measurement of surface roughness - Google Patents
Improvements in or relating to the measurement of surface roughnessInfo
- Publication number
- GB549987A GB549987A GB358641A GB358641A GB549987A GB 549987 A GB549987 A GB 549987A GB 358641 A GB358641 A GB 358641A GB 358641 A GB358641 A GB 358641A GB 549987 A GB549987 A GB 549987A
- Authority
- GB
- United Kingdom
- Prior art keywords
- armature
- spring
- adjustable
- stylus
- cores
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
549,987. Electric measuring apparatus. KAPELLA, Ltd., and REASON, R. E. March 15, 1941, Nos. 3586/41 and 4898/42. [Class 40 (i)] [Also in Group XXXIX] In electric responsive apparatus for measuring small movements such as a gauge or a surface roughness indictor, and comprising a pair of electro-magnetic devices having magnetic cores linked with windings differentially responsive to motion of an armature controlled by a stylus, feeler or the like, the armature is controlled by one or more springs arranged and dimensioned so that the resultant of the mechanical and magnetic forces acting thereon is substantially constant throughout the working range, thus compensating the varying magnetic force in the armature and providing uniform working pressure on the stylus. The output of the apparatus is indicated or recorded as described in Specifications 539,271, 539,272, 539,273 and 539,274. The electromagnetic devices may be transformers, auto-transformers or chokes fed with A.C. or pulsating D.C. which is modulated by movements of the armature. In one arrangement, Fig. 1, for measuring surface roughness, the armature B carries at one end a stylus B2 for movement over the surface and is pivoted on a ligament spring B1 so that its other end moves towards and away from the poles of a pair of E- shaped cores A, A<SP>1</SP> carrying primary windings D, D<SP>1</SP> connected to parallel or series and secondary windings E, E<SP>1</SP> connected in series opposition. The cores A, A<SP>1</SP> may be separately adjustable to vary the gaps or as shown, both are carried by a frame H adjustable in the casing F by a screw F2. The balancing springs G, G<SP>1</SP> engaging the armature are also adjustable. The stylus B2 projects through a presser foot C<SP>1</SP> and the adjustment of the cores adjusts the datum line of the measurement whereby the full scale of the indicating or recording instrument or a part thereof may be caused to correspond with a part of the total possible range of movement of the stylus. The casing of the instrument is of high permeability material for shielding purposes. The ligament spring B<SP>1</SP> may constitute the spring for counterbalancing variations of force or may assist springs G, G<SP>1</SP>. In a modification, Figs. 3 to 5 (not shown), the end of the armature is secured to the centre of a transverse leaf spring anchored at its end to the frame H. Another modification, Figs. 6 and 7 (not shown), comprises substantially the gauge head shown in Fig. 11 of Specification 541,628 with an adjustable leaf spring for compensating the variations of magnetic force on the armature (movable core). In another gauge head shown in Fig. 8, the armature T is pivoted at one end on a ligament spring T<SP>1</SP> and carries at its other end an adjustable stud T<SP>2</SP> bearing against the centre of a transverse leaf spring X which compensates the magnetic force variations and is supported against four studs X<SP>2</SP> on a fixed support. The armture operates between a pair of electromagnetic devices V<SP>2</SP>, V<SP>3</SP> adjustably mounted in the casing U. The gauging member W sliding in tube U<SP>1</SP> is held against the armature by spring W<SP>3</SP>, the armature being provided with an adjustable wedge W<SP>2</SP> to engage the gauging member and being held down against that member by a spring W<SP>5</SP>.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB358641A GB549987A (en) | 1941-03-15 | 1941-03-15 | Improvements in or relating to the measurement of surface roughness |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB358641A GB549987A (en) | 1941-03-15 | 1941-03-15 | Improvements in or relating to the measurement of surface roughness |
Publications (1)
Publication Number | Publication Date |
---|---|
GB549987A true GB549987A (en) | 1942-12-17 |
Family
ID=9761135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB358641A Expired GB549987A (en) | 1941-03-15 | 1941-03-15 | Improvements in or relating to the measurement of surface roughness |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB549987A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2281779A (en) * | 1993-09-14 | 1995-03-15 | Rank Taylor Hobson Ltd | Metrological instrument |
US5847270A (en) * | 1994-10-20 | 1998-12-08 | Taylor Hobson Limited | Stylus attachment for a metrological instrument |
GB2339287A (en) * | 1998-07-09 | 2000-01-19 | Taylor Hobson Ltd | Correcting phase differences in a transducer circuit |
-
1941
- 1941-03-15 GB GB358641A patent/GB549987A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2281779A (en) * | 1993-09-14 | 1995-03-15 | Rank Taylor Hobson Ltd | Metrological instrument |
GB2281779B (en) * | 1993-09-14 | 1997-04-23 | Rank Taylor Hobson Ltd | Metrological instrument |
US5740616A (en) * | 1993-09-14 | 1998-04-21 | Taylor Hobson Limited | Metrological instrument with stylus for traversing workpiece |
US5847270A (en) * | 1994-10-20 | 1998-12-08 | Taylor Hobson Limited | Stylus attachment for a metrological instrument |
GB2339287A (en) * | 1998-07-09 | 2000-01-19 | Taylor Hobson Ltd | Correcting phase differences in a transducer circuit |
GB2339287B (en) * | 1998-07-09 | 2002-12-24 | Taylor Hobson Ltd | Transducer circuit |
US6505141B2 (en) | 1998-07-09 | 2003-01-07 | Taylor Hobson Limited | Transducer circuit |
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