What is slip gauge in sine bar?
What is slip gauge in sine bar?
A sine bar with slip gauge blocks is used for precise angular measurement and used to measure sine bars very accurately or to detect any work that offered a high level of accuracy in measuring angles for milling, grinding, and inspection applications.
What are the accuracy of sine bar and slip gauge?
The axes of these two cylinders are mutually parallel to each other, and are also parallel to, and at equal distance from, the upper surface of the sine 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.
What is the basic difference between sine bars sine plates and sine tables?
Sine blocks are identical to sine bars, but just slightly wider. Sine plates are also similar in design, but have a few important differences. A sine plate is much wider in structure (like a surface plate) and connected by a hinge to a base plate at the bottom cylinder.
What is a sine bar used for?
A sine bar is used either to measure an angle very accurately or face locate any work to a given angle offering a high degree of accuracy in measuring angles for milling, grinding and inspection applications.
Why there are holes in sine bar?
Holes are produced in the sine bar for reducing the weight of the sine bar so that handling of the sine bar will become easier. Only sine bar can’t be used for measurement of angles of a component, but the sine bar is always used in association with slip gauges or Height Gauge for measurement of the angles.
How do you use a sine gauge?
To measure a known angle or locate any work to a given angle:
- Always use a perfectly flat and clean surface plate.
- Place one roller on the surface plate and the other roller on the slip gauge block stack of height H.
- Let the sine bar be set to an angle ϴ.
- Then sin(ϴ) = H/L, where L is the distance between the center.
What is the limitations of sine bar?
Limitations of the Sine Bar: Any unknown projections present in the component will cause to induce errors in the angle measured. For the building of the slip gauges, there is no scientific approach available and it is to be built on the trial and error basis and it is a time-consuming process.
Why is sine bar limited to 45 degrees?
Now sec θ increases very rapidly for an angle greater than 45°. Therefore, it is not recommended to use sine bars for angles greater than 45° because any error in the sine bar or height of slip gauges gets accentuated.
What is the height of slip gauge?
The height of the slip gauge block is found by multiplying the sine of the desired angle by the length of the sine bar: H = L * sin(θ). For example, to find the gauge block height for a 13˚ angle with a 5.000″ sine bar, multiply the sin(13˚) by 5.000″: H = 5.000″ * sin(13˚).
What are the limitations of sine bar?
Limitations of the Sine Bar:
- Any unknown projections present in the component will cause to induce errors in the angle measured.
- For the building of the slip gauges, there is no scientific approach available and it is to be built on the trial and error basis and it is a time-consuming process.
How many types of slip gauges are there?
three basic forms
Explanation: There are three basic forms of slip gauges. These are rectangular, square with center hole, and square without centre hole. Rectangular blocks are less expensive hence are more widely used. 3.
Why holes are made in sine bar?
What is the limitation of sine bar?
Following are the limitations of sine bar: During the measurement of the angle using the sine bar, the sine bar length must be greater than or equal to the length of the component to be inspected. If the length of the inspected component is too long, there is no sine bar available that is longer than the component.
Why are slip gauges used?
Slip gauges or gauge blocks are used as standards for precision length measurement. These gauges are made in sets and consist of a number of hardened blocks made of high-grade steel with low thermal expansion. Slip gauges are rectangular blocks of hardened and stabilized high-grade steel or zirconium oxide (ZrO2).
Why are slip gauges kept at 20 degrees Celsius?
Gauge blocks are calibrated to be accurate at 20 °C (68 °F) and should be kept at this temperature when taking measurements. This mitigates the effects of thermal expansion.
Why are slip gauges called Johansson gauges?
Gauge blocks were invented in 1896 by Swedish machinist Carl Edvard Johansson. Hence the name “Johansson gauge blocks or “Jo-ey” or Jo gauge blocks for short.
Why ceramic slip gauge is better than steel slip gauge?
Why ceramic slip gauges is better than steel slip gauges? Explanation: Ceramic slip gauges are about 10 times more resistant to wear as compared to steel slip gauges. Natural stability and durability due to its low friction co-efficient make it more resistant.
Why ceramic slip gauges is better than steel slip gauges?
How do you protect slip gauge from rust?
The gauge is applied with petroleum jelly, high-grade lanolin preparation or other anti-corrosive materials to avoid rusting. Explanation: The slip gauge and their case must be protected carefully from dust and rust. After use, they should be kept only in closed cases.
How do you find the sine bar of a slip gauge?
Place one roller on the surface plate and the other roller on the slip gauge block stack of height H. Let the sine bar be set to an angle ϴ. Then sin (ϴ) = H/L, where L is the distance between the center.
What is the difference between height gauge and sine bar?
The difference of the two height gauge reading being the rise of the sine-bar as shown in fig 1.24. A sine bar has to be used in conjunction with a surface plate and slip gauges. Sine bar is used for checking angle of components, taper of work pieces, etc. It is also used for setting a work to a known required angle.
How to check the angle of small size components using slip gauge?
For checking the angle of small size components, a sine bar is set up approximate (Nominal) angle on a surface plate by suitable combination of slip gauges. The component being checked is placed over the surface of a sine bar as shown in Fig. 1.23. A dial gauge is mounted upon a suitable stand such as universal surface gauge.
How to check the angle of small size components using sine bar?
For checking the angle of small size components, a sine bar is set up approximate (Nominal) angle on a surface plate by suitable combination of slip gauges. The component being checked is placed over the surface of a sine bar as shown in Fig. 1.23.
