CMM probs convert physical measurements into electrical signals. CMM probes have a wide classification for direct and comparative measurements.
CMM probes are available in three main forms:
- Touch-Trigger probes
- Displacement Measuring CMM probes
- Proximity or Non-contact Probes
Touch-Trigger probes
Touch-trigger probes are the most common type. They actually touch the surface of the work-piece, and open contact, send a signal with the coordinates of the point to the CMM.
The probe is than backed off and move to the next location where the process is repeated.
Displacement measuring CMM probes
Displacement measuring CMM probes are also known as scanning probes. This method generally involves passing the prob over a target surface at its working range. As the probe scans the surface, it transmits the continuous flow of data to the measurement system.
Scanning contact probes many use LVDT(Linear variable differential transformer) or optoelectronic position sensing.
Proximity or non-contact probes
Proximity or non-contact probes function similarly to displacement measuring CMM probes, but they use laser, capacitive or video measurement technology instead of LVDT’s.
Types of CMM
There are four basic types of stationary CMM:
- Bridge.
- Cantilever.
- Horizontal Arm.
- Gantry.
Read More about Types of CMM
Learn CMM: Check here for an online course