Question

Which of the following is true for trigger type probe system used in computer controlled CMM?

(a) Bucking mechanism is a 2 point bearing

(b) Current coordinate position stored when circuit is close

(c) Contacts of point bearing arranged at 90 degree

(d) Contacts of point bearing act as electrical micro switches

I have been asked this question in unit test.

The query is from Coordinate Measuring Machines in chapter Machine Tool Metrology of Engineering Metrology

Answer 1

The correct option is (d) Contacts of point bearing act as electrical micro switches

Best explanation: The “buckling mechanism” in trigger type probe system is a 3 point bearing, the contacts of which are arranged around the circumference at 120 degrees. These contacts act as micro switches.