| Job Title |
Surface-plate Finisher |
| Job Description |
Inspects Surface Of Stone Plates To Determine Areas Requiring
Lapping, And Levels Stone Surface To Specified Tolerance For Use
As Surface Plates: Builds Bed Of Timbers On Floor Beneath Head
Of Lapping Machine. Positions Stone On Timbers, Using Hoist.
Aligns Stone With Arm Of Lapping Machine And Levels Stone On
Timbers, Using Wedges, Blocks, And Spirit Level. Moves
Straightedge Over Stone To Detect Uneven Areas On Stone Surface.
Wets Stone Surface, Using Hose, And Applies Abrasive To Stone,
Using Brush. Selects Lapping Block (metal Or Stone) According To
Uniformity Of Stone Surface Or Step In Finishing Process. Lifts
Block Onto Stone, Using Hoist. Secures Block To Arm Of Lapping
Machine, Using Wrench. Starts Machine And Presses Buttons To
Guide Spinning Block Over Uneven Areas Of Stone Surface. Moves
Tolerance Dial Indicator Through Specified Patterns On Stone And
Observes Dial To Detect Tolerance Deviations. Changes Lapping
Blocks According To Readings From Tolerance Dial Indicator And
Laps Surface Down To Level Finish. Laps Stone By Hand To Level
Surface To Specified Tolerance. Sights Through Convex Lens Of
Collimator At Specified Positions On Stone Surface To Determine
Whether Surface Plate Has Been Finished Within Prescribed
Limitations Of Accuracy And Determine Tolerance Deviation Of
Plate's Surface. Prepares Graph Of Collimator Readings,
Indicating Tolerance Deviation At Any Point On Surface Of Plate.
Drills Adapter Holes In Surface Plate To Facilitate Attachment
Of Measuring Instruments, Using Diamond Drill.
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