Measuring step height

I have a Visio 300
PC-DMIS 4.3
I set up 2 gage blocks side by side 1 .600" and 1 .550"
I measured a the top of the .600" block with an auto focus point max zoom
set the (Z) origin to that point
measured the same point 10 times and got a range of .00222"
did the same on the .550" block and got a range of .00247"
I don't understand I feel this should be more accurate than this.
Does anyone have any settings suggestions that I can try?
Thanks

Parents

DJAMS over 15 years ago

TOP SURFACE=FEAT/VISION/SURFACE POINT,CARTESIAN
THEO/<0,0,0>,<0,0,1>
ACTL/<0.00201,0.00131,0.00084>,<0,0,1>
TARG/<0,0,0>,<0,0,1>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW_VISION_PARAMETERS=YES
TYPE=AUTOMATIC HIT TARGET
[COLOR="Red"][B]MAGNIFICATION=4.51213[/B][/COLOR]
HIT TARGET COLOR=WHITE,NOMINAL COLOR=GREEN
HIT TARGET=SA1,YES,0.01721,0.01525
FOCUS=FULL,0.4,NO,6,NONE,NO,TOP LIGHT [OFF] : BOTTOM LIGHT [OFF] : RING
[COLOR="red"][B]LIGHT [ON:89%{1111}][/B][/COLOR]
DIM LOC1= LOCATION OF POINT TOP SURFACE UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=200.00 OUTPUT=BOTH
AX NOMINAL MEAS
X 0.00000 0.00201 ----#---
Y 0.00000 0.00131 ----#---
Z 0.00000 0.00084 ----#---
END OF DIMENSION LOC1

I'd say MAG=too low and LIGHT=too high for repeatable Z measurement. I tried gage block on OGP Flash (non-pcdmis system) at max magnigication and light @35%. 10 run repeatability = 0.0002". At low mag, I got 0.001". I did not test at blinding light intensity, since I know this causes measurement issues.

I'm a cmm guy and tend to pooh-pooh vision measurements, but was fairly impressed by this.

Reply

DJAMS over 15 years ago

TOP SURFACE=FEAT/VISION/SURFACE POINT,CARTESIAN
THEO/<0,0,0>,<0,0,1>
ACTL/<0.00201,0.00131,0.00084>,<0,0,1>
TARG/<0,0,0>,<0,0,1>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW_VISION_PARAMETERS=YES
TYPE=AUTOMATIC HIT TARGET
[COLOR="Red"][B]MAGNIFICATION=4.51213[/B][/COLOR]
HIT TARGET COLOR=WHITE,NOMINAL COLOR=GREEN
HIT TARGET=SA1,YES,0.01721,0.01525
FOCUS=FULL,0.4,NO,6,NONE,NO,TOP LIGHT [OFF] : BOTTOM LIGHT [OFF] : RING
[COLOR="red"][B]LIGHT [ON:89%{1111}][/B][/COLOR]
DIM LOC1= LOCATION OF POINT TOP SURFACE UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=200.00 OUTPUT=BOTH
AX NOMINAL MEAS
X 0.00000 0.00201 ----#---
Y 0.00000 0.00131 ----#---
Z 0.00000 0.00084 ----#---
END OF DIMENSION LOC1

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