Profile Projectors:

What is an optical comparator?

Also known as a shadowgraph or profile projector, an optical comparator uses a high-intensity light source (either LED or halogen) to project the magnified external profile image of an object onto a screen.

The technology is simple – using just the light source, a lens, and mirrors to create the image on the screen. This simplicity makes it reliable, easy to maintain, and part of the reason why a Starrett optical comparator will last for years to come.

The outlined image can then be compared and measured against a master overlay secured onto the screen or by using the measuring elements that fit onto the projector slide and table. MetLogix™ software provides the coordinate display for X and Y linear axes and Q angular values for screen rotation.

What can you do?

Profile projectors are used for the comparison of a part to a scaled drawing. The part can also be measured using a digital display. This non-contact measurement is used to determine quality, accuracy, and precision.

Best metrology applications for optical comparators

Profile projectors help engineers measure and inspect an endless variety of components including:

§ crankshafts, con rods, camshafts, pistons, and driveshafts (automotive)

§ turbine blades, engine shafts, turbine discs (aerospace)

§ inspect turbine blades (power generation)

§ window extrusion (double glazing)

§ pressings I springs I  gears

§ switches and small electrical components

§ tool, tips, and taps

§ glass and plastic bottles and containers, screw threads, wall thickness, and form (packaging industries)

§ replacement hip joints (medical)

§ coin dies and coins (mint)


    §  Vertical bench profile projectors:  VB400

§ Vertical floor profile projectors: VF600

§ Horizontal bench profile projectors: HB400

§ Horizontal floor profile projectors:  HF600

Services we provide: