Starrett Optical Comparator HD400

Warning: This procedure requires trained personnel with PPE!

End cap successfully withdrawn?

Engagement handle successfully unscrewed and removed?

Allen key inserted into the socket lock screw and screw slackened while holding the internal nut in position?

Bearing mount/collet rotated to give the required tension?

Engagement handle and end cap refitted?

Sign off on the latch block adjustment

CAUTION! Do not use polishes, or window cleaning aerosols and liquids for cleaning lenses.

* Do not touch the inner surfaces, (those facing away from the workpiece), of the projection or condenser lens. The projection lens is the most critical; a finger mark on the inner surface will degrade the quality of the projected image.

• Remove any accumulated dust with a photographic lens brush.

• Remove any grease or finger marks with a new photographic cleaning tissue, which may be moistened with Isopropyl Alcohol if necessary.

CAUTION! The mirrors should be cleaned as infrequently as possible. It is recommended that cleaning is performed by service engineers.

* Do not touch the surface of the mirrors.

CAUTION! Do not touch the surfaces of the lens.

Rotate the lens anti-clockwise and withdraw it.

Fit the replacement lens, rotate it clockwise until it is secure.

Check that the two red spots are aligned.

Sign off on the lens replacement