Roundness Testing in Chennai

Roundness Testing in Chennai – Kosaka Calibration Lab offers you the best services in adherence to international quality standards.

Roundness is the measure of how closely the shape of an object methodologies that of a precisely perfect circle. Roundness applies in two dimensions, such as the cross sectional circles along a cylindrical body such as a shaft or a cylindrical roller for a bearing. One of the most essential fundamental forms for engineering components is the circular cross-section. Roundness forms arise in many applications, mainly in bearing surfaces such as rotating shafts and ball bearings.

Types of Roundness Measurement Techniques

• Diameter measurement
• Vee-block
• Co-ordinate Measuring Machine
• Rotational Datum

Methods of Roundness Measurement

Diameter measurement

Possibly the first and simplest approach to defining the roundness of a component is to measure the reliability of its diameter at some different orientations. This is often done in-process for checking machine set-up and can be suitable for assessing a component where the roundness is a cosmetic, rather than functional, requirement. It can be functionally relevant of course.

Vee-Block Method

Another process for determining roundness that is often used is to place the part in a vee-block and rotate it in contact with a dial gauge or similar indicator. This is basically a three point method rather than the two-point method above. If the part is truly round, with slight irregularity, the pointer of the gauge will not move.

Co-ordinate Measuring Machine (CMM)

Another way to measure roundness is to use a coordinate measuring machine (CMM). A standard CMM has three accurate, orthogonal axes and is equipped with a touch-trigger probe. The probe is brought into contact with the component being measured and its position is recorded.

Rotational Datum Method

The most accurate process for determining roundness of a component is to measure the variation of radius from an accurate rotational datum using a scanning probe (one that remains in contact with the surface and collects a high-density of data points).

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