Heidenhain MT 1287 Metro Length Gauge provides a 1Vpp output and ±0.2um accuracy. The MT 1287 is extended by pneumatic (air) actuation to a 12mm travel length.
Metro length gauges are designed with ball-bush guides. The following are some of the basic properties of ball-bush guides in HEIDENHAIN length gauges: Low friction, which makes versions of length gauges with reduced gauging force possible. Safe plunger extension and retraction even with high radial force. High precision of the measuring loop thanks to a guide that is free of play (the bearing and plunger are specially fitted during manufacture).
Pneumatic plunger actuation: The MT 1287 length gauges are extended by the application of compressed air. When the air connection is ventilated, the integral spring retracts the plunger to a protected resting position. The gauging force can be adjusted to the measuring task through the level of air pressure. At constant pressure, it depends on the operating orientation and the plunger position.
Operating orientation: MT 1287
· Upward: -0.13 N
· Downward: +0.13 N
The MT 1287 length gauges feature a standard clamping shank with 8h6 diameter. Therefore these Heidenhain length gauges can be easily used with existing measuring fixtures and stands. Heidenhain offers a special clamping sleeve and clamping bush with one screw each. These accessories will make it easier to fasten the length gauge without overloading the 8h6 clamping shank of damaging the ball-bush guide. The clamping bush also enables a wide tolerance field for the tightening torque and improves fastening. Sleeve: ID 386811-01/Bush: ID 1177968-02
Thermal dynamics: Heidenhain length gauges have a defined thermal behavior. Since temperatures can vary during the measurement process and possibly cause a measuring loop, Heidenhain uses special low coefficient of expansion material for the components of the measuring loop.
Repeatability: Whereas the system accuracy applies over the entire measuring range, for some applications the reliability is the decisive factor. It plays an important role in repeated measurements. The repeatability of the length gauges is usually better than the values listed by Heidenhain. Reliability depends on the combination of materials used in the components, installed electronics, optomechanics used, and the bearing of the plunger. MT 1287: 0.03um.
