标题: Error Compensation of Coordinate Measuring Machines [打印本页] 作者: info 时间: 2013-4-19 14:15 标题: Error Compensation of Coordinate Measuring Machines Error Compensation of Coordinate Measuring Machines
G. Zhang, Tianjin University/PRC, R. Veale, T. Charlton, 6. Borchardt and R. Hocken (2). National Bureau of Standards,
Gaithersburg, MD 20899
The m e ~ i i u d s and r e s u l t s .?re presented Filr app1;;ini sili'twarc c r r o r iompensation to a commercir;l
measuring machine. The technique i n c n r p n r a t e s cumpensatlon fol- gc-r!metric p o s i t i o n i n g e r r o r s and some thermal e f f e c t s .
Geometric error ctwputatinu is based nn n ri,gid body mode!
p l e t e kinematic equations u i the eiroi nititions a r e p r e s e n t e d . The rnrasurenient method only r e q u i r e s t3king d small s e t
of d a t a f o r cacti a x i s tc) compute the errors throughout the iull workzone. To achieve the d e s i r e d accuracy. squareness
1s determined usinx l i n e a r displacement men~iirements a l u n g s e l e c t e d macliine diagonals. The dominant thermal e f f e c t s
i n the machine ,are removed b introducing the concept of a n " e f f e c t i v e " nominal d i f f e r e n t i a l expansion c o e f f i c i e n t .
'rhp e n t i r e errnr c:m,>cnsatiir camputatiun i s incorporated I n t o the mari:ine u u s i t i o n reading s u h r o u t i n e t o automaticallv
produce compcosnted rpndings.
~ r a r i l vo r i e n t e d lines through t h e woi -kzone ~ l n db y me a sur ing t h e l e n g t h of a 500 mm ga z e block i n s e v e r a l o r i e n t a t i o n s .
The r e s u l t s shot; ii f a c t o r oi tm per formance impravenent ( l i n i t e d by m~ a ~ i i r eme nr te p e a t a b i l i t y ) ov