Home

Company Profile

Capabilities

Industries Served

What is Alignment?

ON TRACK-Laser Tracker Services

Mechanical Services

Product Offer Sheets

Service Reports

Locations

News & Events

Request Quote

Employment Opportunities

Contact Us

Definitions

Optical Instruments
References
Procedures

Optical Instruments

Alignment (Control) Instrument

An optical instrument used to establish a reference line of sight from which other optical instruments can be collimated or collineated. Usually this control instrument is bucked-in to the machine baseline.

Sight Level (SL)

An optical instrument used for measuring the level to earth condition of machine components.

Telescopic Transit Square (TTS)

An optical instrument used by OASIS which consists of two optical systems arranged exactly 90 degrees to each other. These systems form accurate perpendicular lines of sight.

Line Of Sight (LOS)

A line projected by an optical instrument from which all measurements are made.

References

Baseline

A parallel reference line which represents the machine centerline. It is usually established by Stainless Steel Target Bushings or brass plugs embedded in the floor on the operator side of the machine. In the case of newer, free standing equipment, this reference is installed in the cross-machine direction directly in the frame or soleplates.

Brass Plug (BP)

A monument embedded in the floor with an affixed prick punch mark used as a reference point on a baseline.

Optical Scale

A device that has accurately positioned increments which can be
measured optically.

Optical Target

A device inserted into a Stainless Steel Target Bushing, with accurately positioned patterns which can be measured optically.

Stainless Steel Target Bushing (SSTB)

A machined bushing designed and used exclusively by OASIS in the installation of baselines. It performs the same function as a brass plug but is far more accurate due to its ability to accept an optical target.

Stick on Target

An adhesive backed optical target used as a temporary reference where permanently fixed target bushings are not always practical.

Procedures

Buck-In

Setting a line of sight parallel to at least two reference points such as Stainless Steel Target Bushings, brass plugs, or both ends of a machine component.

Collimation

Setting two optical instruments so their lines of sight are parallel but not coincident.

Collineation

Setting two optical instruments so their lines of sight are coincident.

Planizing

Setting an instrument’s line of sight parallel to a given plane. This plane can be defined by three points, or by two points and a level instrument.