Table of Contents
What is meant by sine bar?
Definition of sine bar : a device that consists of a steel straightedge at whose extremities buttons are attached with their centers equidistant from the straightedge and that is used to locate work at desired angles on angle plates.
How sine bars are used for angle measurement?
Angles are measured using a sine bar with the help of gauge blocks and a dial gauge or a spirit level. The aim of a measurement is to measure the surface on which the dial gauge or spirit level is placed horizontally. At this position, the top surface of the sine bar is inclined the same amount as the wedge.
What is a sine plate for?
Definition of sine plate : a block or plate for holding parts for machining at desired angles.
What is limitation of sine bar?
Following are the limitations of sine bar: Any unknown projections present in the component will cause errors in the measured angle to be induced. For the construction of slip gauges, there is no scientific approach available and it has to be built on trial and error basis and it is a time-consuming process.
What precautions should be taken while using sine bars?
Precautions in use of sine bars.
- (i) The sine bar should not be used for angle.
- (ii) A compound angle should not be formed by mis-aligning of workpiece with the sine.
- (iii) Accuracy of sine bar should be ensured.
- (iv) As far as possible longer sine bar should be used since many errors are reduced by.
What are the limitations of sine bar?
Following are the limitations of sine bar:
- Any unknown projections present in the component will cause errors in the measured angle to be induced.
- For the construction of slip gauges, there is no scientific approach available and it has to be built on trial and error basis and it is a time-consuming process.
Why is sine bar limited to 45 degrees?
3. Why is a sine bar not suitable for measuring angle above 45? The sine bars become inaccurate as the angle exceeds 45° because the bar(product) is physically clumsy to hold at that position and even a slight error of the sine bar can cause large angular errors.
What material is sine bar made of?
The Sine Bar Sine bars are made from a high chromium corrosion resistant steel, and is hardened, precision ground, and stabilized. Two cylinders of equal diameter are placed at the ends of the bar.
How accurate is a sine bar?
Sine bars are made from a high chromium corrosion resistant steel, and is hardened, precision ground, and stabilized. Two cylinders of equal diameter are placed at the ends of the bar. Accuracy up to 0.01mm/m of length of the sine bar can be obtained. A sine bar is generally used with slip gauge blocks.
Why the holes are drilled in the body of a sine bar?
Sine bar consists of a precisely machined corrosion resistant chrome steel. It is essentially hardened and stabilized. The relief holes are drilled into the body of sine bar to reduce the weight, and to facilitate handling.
How do you use a sine bar?
A sine bar is often used with gauge blocks. The sine bar forms the hypotenuse of a right triangle , while the gauge blocks form the opposite side. The height of the gauge blocks is found by multiplying the sine of the desired angle by the length of the sine bar. To find the height for a 13-degree angle,…
Working Principle of Sine bar. Angles are measured using a sine bar with the help of a gauge block and dial gauge or spirit level.
What is the largest possible value for sine and cosine?
Answers. The largest possible value for the sine function and the cosine function is 1 and the smallest possible value is -1 . the range for each of these functions is [-1,1]
What are sine rules?
Sine Rule (The Law of Sine) The Sine Rule is used in the following cases: CASE 1: Given two angles and one side (AAS or ASA) CASE 2: Given two sides and a non-included angle (SSA) The Sine Rule states that the sides of a triangle are proportional to the sines of the opposite angles.