Question

Which of the following is NOT a common probe type used in a coordinate measuring machine?

• A. Electromagnetic
• B. Laser
• C. Scanning
• D. Touch-trigger

Hint:

CMM data collection is driven by physical contact (such as Touch-trigger or continuous Scanning) or optical methods (such as Laser scanning). Magnetic or electromagnetic field induction is not typically used for coordinate tracing.

Answer 1

The Correct Option is A

A CMM finds the shape of a part by touching or scanning its surface and reading off coordinates. The common ways of doing this are a touch trigger probe that records a point the instant it touches the part, a scanning probe that slides continuously along the surface to collect a stream of points, and a laser or optical probe that measures distance without ever touching the part at all. There is no standard CMM probe that works on an electromagnetic principle, magnetism is not used to sense the position of a surface in these machines. So electromagnetic is the odd one out among the listed probe types.