Dovetail Dial Indicator Measurement Concepts

This video tutorial introduces dial indicators, explaining their use in measuring runout and axial clearance. It details the components of a dial indicator, including the plunger, body, and dial, and how to calibrate them. The tutorial covers reading both linear and dovetail dial indicators, interpreting measurements, and calculating total needle movement. It emphasizes the importance of understanding the scale and revolution counter for accurate readings.

What is the primary use of dial indicators?

• To measure runout and axial clearance

• To measure temperature changes

• To measure electrical resistance

• To measure sound levels

What does axial runout refer to?

• The temperature fluctuation of an object

• The horizontal movement of an object

• The untrue movement of a rotating object

• The vertical movement of an object

Which part of the dial indicator allows for calibration?

• The scale lock

• The revolution counter

• The plunger

• The mounting adapter

What is the range of the one-inch linear dial indicator discussed?

• Zero to half an inch

• Zero to three inches

• Zero to one inch

• Zero to two inches

How many thousandths of an inch does each large scale line represent?

• Twenty thousandths of an inch

• Ten thousandths of an inch

• Five thousandths of an inch

• One thousandth of an inch

What is the maximum measurement capability of the dovetail dial indicator?

• Fifty thousandths of an inch

• Thirty thousandths of an inch

• Ten thousandths of an inch

• One hundred thousandths of an inch

How is the dovetail dial indicator typically read?

• By counting in thirds

• By counting in full units

• By counting in halves

• By counting in quarters

What is the total needle movement if it swings from plus five thousandths to minus ten thousandths of an inch?

• Fifteen thousandths of an inch

• Five thousandths of an inch

• Ten thousandths of an inch

• Twenty thousandths of an inch

In the example given, what is the total movement on the dovetail indicator?

• Three thousandths of an inch

• Twelve thousandths of an inch

• Six and a half thousandths of an inch

• One thousandth of an inch

Why is it often unnecessary to look at the small gauge on a dial indicator?

• Because it is not used for measurements

• Because it is not calibrated

• Because it is too small to read

• Because it is less than one full revolution