Brunson 771 - Page 37

33 Operation and Adjustment Manual
We’venowintroducedanumberofopticaltoolingtechniquesthat
canbeusedtomeasureandalignanynumberofmachines,compo‐
nents,orassemblies:
 Buckingin
 Autoreflection
 Autocollimation
 Collimation
 Collineation
 ReticleProjection
 Measuringwithmicrometers

Theseareallthebuildingblocksyouneedtoperformawidevari‐
etyofmeasurementsandalignmentsinthefield—theapplications
arelimitedonlybyyourimagination.
Figure3.20
Here’sahelpfultiptoincreasemeasurementaccuracy:Goodmeasurement
practicetellsusalwaystocometoourmeasurementfromthesamedirection.
Thisminimizesoreliminatesbacklashfromthemicrometerreading.So,itis
usefultoadoptadisciplineofalwayscomingtoameasurementbymoving
themicrometerdrumin,say,aclockwisedirection.Thisincludesinitiallyset‐
tingthemicrometertozerobymovingthedruminthesamedirection.Ifthe
finalreadingiscounterclockwisefromthecurrentmicrometerposition,back
thedrumbeyondthedesiredlocationandmoveitonceagainintheclockwise
directionbacktothereadingpoint.