Rotary

Rotary Scales

Maximize performance of any optical encoder with precision glass scales by VC America. Rotary and Linear scales are manufactured using soda-lime glass with chrome reflective and absorptive layers optimized for 630-640nm (Red LED), with dimensional precision and low defect density.

Standard scales provide opportunity for fast evaluation and support production and we manufacture to customer specifications for unique patterns and dimensional requirements.

Scale
Series
TypePitch/Period
Accuracy
Maximum Dimension(mm)DescriptionMounting
LocalTotal
Precision Rotary ScalesG±1µm±2µm150DiameterReflective chrome on clear glassEpoxy and UV adhesive
AReflective chrome with bottom side absorptive layerEpoxy
EEnhanced Reflective chrome with bottom side absorptive layer
CReflective chrome with bottom side absorptive layer and clear center zoneEpoxy and UV adhesive

Rotary scales OD and ID are sawed and edges may be straight cut or beveled with chamfer or rounded edges.

Material characteristics
(Linear and Rotary)
MaterialSoda-lime glass
Temperature Coefficient (TCE)8.5x10-6
Chrome LayersMinMaxUnits
Reflective5060%
Enhanced Reflective88%
Absorptive
(anti-reflective)
5%
Rotary Scale Dimensional Tolerances
SymbolSpecificationToleranceUnits
ODCore Outside Diameter±0.1mm
IDCore Inside Diameter±0.1mm
TThickness±0.05mm
TTVTotal Thickness Variation10µm
LTVLocal Thickness Variation5µm
Metal Pattern alignment to axis±20µm

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