Optical Comparator

Visual Measurement

Geometry such as thread profiles and angles are easily verified using this non-contact method. The optical comparator allows for the inspection of delicate parts that might be deformed by traditional calipers. Magnification levels vary depending on the lens installed, often ranging from ten to one hundred times the original size.

Accurate readings depend on the alignment of the part within the light path.

Inspection Speed

Efficiency on the shop floor increases when operators can quickly check multiple dimensions in a single setup. An optical comparator provides an immediate view of the entire part profile, which is faster than measuring individual features one by one. Using an overlay on the screen allows for a pass or fail check in seconds.

This speed is beneficial for high volume production lines where sampling rates are frequent.

Limitation Threshold

Shadow projections are inherently two dimensional, which restricts the device to measuring the profile of a component. Use of an optical comparator is not suitable for inspecting internal bores or features hidden from the light source. The accuracy of the measurement is also affected by the sharpness of the shadow, which can be degraded by dirt or grease on the part.

While excellent for flat or cylindrical parts, the device cannot replace a coordinate measuring machine for complex three dimensional shapes. The unit lacks the ability to sense depth or internal volume.