The video tutorial explains the sine bar, a precise instrument for measuring angles. It covers the components, types, and working principle of sine bars, emphasizing the application of trigonometry. The tutorial demonstrates how to measure angles of small and large components using sine bars, highlighting the importance of accuracy and potential sources of errors. It also discusses the uses of sine bars in checking angles and setting workpieces to known angles.

What is the primary material used to construct a sine bar?

• Copper

• Aluminum

• High-quality steel

• Plastic

What determines the specification of a sine bar?

• The distance between the centers of the rollers

• The length of the sine bar

• The diameter of the rollers

• The weight of the sine bar

What mathematical principle is the operation of a sine bar based on?

• Calculus

• Geometry

• Algebra

• Trigonometry

How is the angle of a small component measured using a sine bar?

• By using a protractor

• By adjusting the slip gauges and using a dial gauge

• By using a laser measurement tool

• By visual estimation

What tool is used alongside a sine bar to measure the height over the rollers for large components?

• A vernier height gauge

• A vernier caliper

• A ruler

• A micrometer

What is a sine bar primarily used for?

• Measuring temperature

• Checking angles of components

• Measuring weight

• Checking electrical resistance

For which range of angles is a sine bar most accurate?

• 0 to 15 degrees

• 90 to 180 degrees

• 15 to 45 degrees

• 45 to 90 degrees

Which of the following is NOT a requirement for a sine bar to be accurate?

• The axes of rollers must be parallel to each other

• The upper surface must be flat and parallel

• The rollers must be of different diameters

• The distance between centers must be precisely known

What is a source of constant angle error in a sine bar?

• Incorrect roller diameter

• Temperature variations

• Non-parallel working surface and cylinder axes

• Inaccurate slip gauge height

What is a source of progressive angle error in a sine bar?

• Error in cylinder center distance

• Non-parallel working surface and cylinder axes

• Temperature variations

• Incorrect roller diameter