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1. Name- Syed Alisan Hossain
Student code- BWU/DME/21/020
Department - Mechanical Engineering
Subject- Metrology and Quality Control
Subject code- DME503
Semester- 5th
SINE BAR AND SLIP GAUGE

2. OUTLINE
● Introduction
● Construction of Sine bar
● Working Principle of Sine bar
● Advantages and disadvantages of Sine bar
● Applications of Sine bar

3. INTRODUCTION
● A sine bar consists of a hardened,
precision ground body with two
precision ground cylinders fixed at
the ends.
● The distance between the centers of
the cylinders is precisely controlled,
and the top of the bar is parallel to a
line through the centers of the two
rollers.

4. INTRODUCTION
● Slip gauges are the universally
accepted 'standard of length' in the
manufacturing and engineering
industries.
● Gauge blocks are calibrated to be
accurate at 20 °C (68 °F) and should
be kept at this temperature when
taking measurements.

5. CONSTRUCTION OF SINE BAR
■ Sine bar has some major parts —
● End face
● Upper surface
● Rollers
● Lower surface
● Relief holes

6. WORKING PRINCIPLE OF SINE BAR
● When a sine bar is placed
on a level surface the top
edge will be parallel to
that surface.
● If one roller is raised by a
known distance, usually
using gauge blocks.

7. WORKING PRINCIPLE OF SINE BAR
● Then the top edge of the bar
will be tilted by the same
amount forming an angle.
● That may be calculated by
the application of the sine
rule.
● sin(ϴ) = H/L

8. ADVANTAGES AND DISADVANTAGES
■ Advantages of Sine bar:
● It is precise and accurate angle measuring device.
● It is simple in design and construction.
● It is casily available.
■ Disadvantages of Sine bar:
● It is limited upto 45⁰.
● Length of the sine bar should be greater or equal
length of the component to inspected.
● Time consuming process.

9. APPLICATIONS OF SINE BAR
● To measure the angle.
● Check the angle of tapper key.
● Check the unknown angle or heavy components.
● Ensuring accurate setups in manufacturing and engineering.
● Aligning workpieces at specific angles.
● Calibration of other measuring instruments.
● Verifying the flatness and parallelism of surfaces.

10. APPLICATIONS OF SINE BAR

11. Thank you