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Difficulty: Very hardPrecision Measurement Instruments

Match each specific automotive machine shop measurement task to the precision instrument most appropriate for performing it.

  • Quantifying lateral runout on a brake rotor or measuring gear backlash in a differential housingDial Indicator
  • Transferring the internal diameter of a deep valve lifter bore so it can be read with an external measuring toolTelescoping Gauge
  • Checking the clearance between a squared piston ring and the cylinder wall to verify end gapFeeler (Thickness) Gauge
  • Precisely measuring the distance from a machined flat surface to the bottom of a stepped blind holeDepth Micrometer
  • Measuring the base circle and peak height of a camshaft lobe to calculate total valve liftOutside Micrometer

Answer

Runout/backlash matches to Dial Indicator; transferring bore ID matches to Telescoping Gauge; ring end gap matches to Feeler Gauge; blind hole depth matches to Depth Micrometer; and camshaft lobe dimensions match to Outside Micrometer.
Each precision instrument in an automotive shop is engineered for specific geometric challenges. Dial indicators track dynamic travel and runout; telescoping gauges transfer hard-to-reach internal dimensions; feeler gauges measure static narrow gaps; depth micrometers measure downward distance from a reference plane; and outside micrometers provide the highest precision for external diameters.

Step-by-Step Solution

1
Analyze the requirement for measuring lateral runout and gear backlash.
Identified Dial Indicator.
These tasks require measuring dynamic movement or play between components, which is uniquely suited to a dial indicator mounted on a magnetic base.
2
Analyze the requirement for measuring a deep lifter bore.
Identified Telescoping Gauge.
Calipers cannot reach deep bores accurately. A telescoping gauge is a transfer tool designed specifically to reach into deep bores, lock the dimension, and be measured externally.
3
Analyze the requirement for measuring ring end gap.
Identified Feeler (Thickness) Gauge.
This task requires sliding a known physical thickness into a narrow clearance gap, which is the exact function of a feeler gauge.
4
Analyze the requirement for measuring blind hole depth.
Identified Depth Micrometer.
A depth micrometer sits flat on a machined surface and extends a rod downward, providing higher precision than the depth rod of a standard caliper.
5
Analyze the requirement for measuring camshaft lobes.
Identified Outside Micrometer.
This is a highly precise external measurement requiring the rigid frame and fine thread pitch of an outside micrometer.

Key Concept

Selecting the correct precision measurement instrument based on physical geometry, accessibility, and the specific automotive tolerance being checked.
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Topics

Precision Measurement Instruments

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