What Is Sigma Comparator?
- The Sigma Comparator Is a Mechanical Comparator Commissioned by an Equipment Manufacturing Company in the Usa.
- They Are Mainly Used to Measure the Surface Roughness by Calculating the Dimensional Difference Between the Measured Surface and the Standard Value of the Surface Material.
- A Magnification Range of About 300 to 500 Is Achieved During This Comparator.
Construction of Sigma Comparator
- The Plunger Slit Is Mounted on the Diaphragm to Give Frictionless Linear Movement. the Knife-Edge Is Fixed Over It, and a Cross Strip Is on the Face of the Moving Member of the Hinge.
- Optionally a Moving and Fixed Member at Right Angles to Each Other Consists of Thin, Flexible Strips. in This, There Is a Moving Component That Carries a Lightweight Y-Type Fork Arm.
- This Phosphor Is Attached to the End of a Thin Ribbon of Bronze, Which Is Rounded into a Small Drum.
- This Drum Is Placed on the Pointer, Which Is Included with the Pointer.
- If There Is a Vertical Displacement, It Causes the Pointer to Rotate Through the System.
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Applications of Sigma Comparator
- Sigma Comparator Is Used in Selective Assembly.
- It Can Also Be Used in Mass Production.
Advantages of Sigma Comparator
- It is cheaper in price than other comparators.
- It does not require any external power source to work.
- It has a bold scale and large pointer, so the measured value can be easily noted.
- It is small in size & easily portable.
- It is very easy to operate.
Disadvantages of Sigma Comparator
- Developed Friction Is High in It, Which Affects the Accuracy.
- As with Many Mechanical Components, the Possibility of Wear and Tear Is High.
- This Device Has a High Probability of Parallax Error.
- Sigma Comparator Also Develops Vibration.