G - Physics – 01 – B
Patent
G - Physics
01
B
33/14, 354/25
G01B 21/04 (2006.01) G01B 5/00 (2006.01) G01B 5/24 (2006.01) G01B 21/24 (2006.01)
Patent
CA 1299362
ABSTRACT The coordinate measuring system comprises a device D and host computer 19. The device D is formed of a base 1 rigidly attached to the article to be measured, an arm 2 rotatable relative to the base 1 only about axis A, arm 3 rotatable relative to arm 2 only about axis B, and arm 4 slidable relative to arm 3 along axis C. The axes A, B ' and C are parallel to the extent obtainable by commercially desirable assembly techniques. At the pivots 5 and 6 and sleeve 7 there are high precision bearings and rotary encoders. At the sleeve 7 the rotary encoder is fixed within arm 3 and driven by a wheel frictionally engaging the surface of arm 4. The rotary encoders provide information which indicates angular displacement of respectively the arms 2 and 3 about axes A and B relative to base 1 and arm 2 as well as the linear displacement of arm 4 along axis C relative to arm 3. Based on the dimensions of arms 2 and 3 and the encoder derived measurements the approximate coordinates (inaccurate due to axes misalignment, flex of components etc.) can be calculated. However computer 19 also has programmed into it after the assembly of device D a set of error terms so as to modify the mathematical transformation used in obtaining the coordinates and produces accurate coordinates. The error terms are obtained by a computerized Error Correction Procedure which compares a number of known coordinate values with the coordinates as measured by the system.
553911
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Mcdonald Gregory James
LandOfFree
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