SCEPTRE System Proportional Displacement Probe
Versatility: It can be configured as a two-axis or three-axis probe. It works in any orientation on CMMs or a variety of measuring instruments, such as flexible gages or machine tools.
The probe can be used for single-point data collection, but the power of the probe is in its continuous-contact scanning capability. It is designed to sense all force vectors acting on the stylus, simulating the human characteristic of "feeling" the workpiece.
This capability allows the gathering of more complete and more accurate information than is possible with the conventional point-by-point method.
Reliability: It has a simple, yet rugged design that means it can handle the toughest working environment, but if you do break it, it's easy to fix -- and EMD promises to fix it and return it within 24 hours!
Durability: Its rugged design also means it will last. No wonder the first EMD Proportional Displacement Probe, built over 10 years ago, is still on the job!
Accuracy: It has exceptional resolution: 0.05 µm -- the smallest detectable displacement; and displacement accuracy is 0.1µm after computer calibration. It has a range of ± 3 mm [± 0.125 inch] with an exceptional linear analog signal. EMD's Proportional Displacement Probe has been tested for system accuracy and scanning performance in compliance with ANSI and ISO CMM Scanning Standards to less than 1µm [0.00004 inch].
THE BEST NEWS: EMD's Proportional Displacement Probe costs about half what any other analog probe costs! So call us today and find out how easy and affordable it is for your CMM to begin analog scanning.
A Completely Unique, Patented Design Never Before Seen In The Industry
The mechanical portion of the probe is made of three cubes that are oriented in mutually perpendicular directions. Each cube is identical to the others, and is made of two right-angle brackets that are connected by eight spring steel wires. A small gap between the brackets allows relative motion between them. The movable bracket can be displaced out of its null position along the direction defined by the open ends of the box, while being positively located in the traverse directions.
A tab on the fixed bracket has two infrared LEDs, which face outward along the axis of travel. The LEDs emit energy, which the photodiodes sense. As the sides of the cube move, one photodiode approaches its LED while the other recedes. Both photo diodes are connected electrically in a differential mode; the change in energy is linear.
The analog signal is amplified at the probe, sent to the machine controller and run through a 16-bit A/D converter. The resulting digital values indicate cube movements, and when all three signals are processed, it is possible to know how much a probe tip has been deflected in 3D space.
Electronic Measuring Devices, Inc., 199 Route 46 East, Budd Lake, NJ 07928. Tel: 973-691-4755; Fax: 973-691-4745.