How to calculate Run Out and bend with Dial Indicator

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Some functions of the gauge Dial Indicator / Dial test Indicator / Dial gauge is to measure the run out (keolengan) and the bend in an object.

There are differences in steps in measuring run out and bending with this dia indicator tool.

Measuring Run out

Run out measurements are intended to determine the extent to which the workpiece experiences sway when rotating.

Examples of run out measurements on vehicles are measurements of the run out of the disc (Disc brake), flywheel (fly wheel), run out ring gear differential and so forth.

Example: disk run out measurement

Run out measurement steps on disc platters :

  1. Clean the spindle tip of the dial indicator and the disc drive from dirt.
  2. Place the magnetic holder dial indicator on the Iron anvil.
  3. Position the spindle perpendicular to the disc, and press the spindle approximately 1 mm to 2 mm (short needle dial indicator moves between 1 to 2 strips)
  4. Set” 0 ” dial indicator
  5. Put a mark on the dish
  6. Turn the disc slowly by 360⁰ and look at the needle designation on the dial gauge. Read the most deviations to the right from “0 ” and to the left from “0”
  7. The measurement results are the largest deviation of the right plus the deviation is shifted to the left, for example deviation to the right by 0.02 mm (2 strips) and deviation to the left by 0.05 mm (5 strips) , then the measurement results run out 0.02 mm + 0.05 mm = 0.07 mm

Measuring bending :

Measurement of bending is intended to determine a shaft is bent or not, and to determine the magnitude of the value of bending that occurs if the shaft is bent.

Examples of measurement of the bend in the vehicle that checks the bend in the cam journal, crank journal and other shafts.

Example: measurement of camshaft bend
Measurement steps bend on the camshaft :

  1. Clean the spindle tip of the dial indicator and camshaft from dirt.
  2. Place the magnetic holder dial indicator on the Iron anvil.
  3. Place the camshaft on the V-Block
  4. Position the spindle perpendicular to the cam journal, and press the spindle approximately 1 mm to 2 mm (short needle dial indicator moves between 1 to 2 strips)
  5. Set” 0 ” dial indicator
  6. Put a mark on the camshaft
  7. Turn the camshaft slowly by 360⁰ and look at the needle designation on the dial gauge. Read the most deviations to the right from “0 ” and to the left from “0”
  8. The measurement results are the largest deviation of the right plus the deviation is shifted to the left then divided by 2, for example deviation to the right by 0.03 mm (3 strips) and deviation to the left by 0.07 mm (7 strips), then the measurement results of its bending (0.03 mm + 0.07 mm): 2 = 0.05 mm



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