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Heidenhain MT 1271 Metro Length Gauges

Heidenhain MT 1271

Heidenhain MT 1271 Metro Length Gauges provides a TTL output and 0.2um accuracy. The MT 1271 is extented by cable or measured object actuation.

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).

For the Heidenhain MT 1271 Metro Length Gauge the plunger is freely moving. For position measurement, the plunger is connected by a coupling with a moving machine element. The force needed to move the plunger is specified as the required moving force. For the MT 1271 the moving force needed to move vertically down is 0.13N.

The Heidenhain MT 1271 come with a built in spring that extends the plunger to the measuring position and produces the gauging force. While at rest the plunger is extended. The gauging force depends on the following criteria:

· Operating orientation

· Plunger position (the force changes over the course of the measuring range)

· The direction of measurement (whether extension or retraction of the plunger is used)

The MT 1271 Length Gauge has a 12mm measuring range and can be connected with cable of up to 30 meters.

Operating orientation: MT 1271

· Upward: -0.13 N

· Downward: +0.13 N

An 8h6 diameter clamping shank comes standard with MT 1200 length gauges. Therefore these Heidenhain length gauges can easily be used with existing measuring fixtures and standards. Heidenhain offers the choice of a special clamping sleeve or a clamping bush each containing one screw. The accessories make it easier to fasten the length gauge without overloading the 8h6 clamping shank or damaging the sliding guide. The clamping bush also enables a wide tolerance field for tightening toque and improves fastening.

Clamping Sleeve ID: 386811-01

Thermal Characteristics: Heidenhain length gauges have a defined thermal behavior. While temperature variations during measuring can result in changes to the measuring loop; Heidenhain uses special material with low coefficients of expansion for the components of the measuring loop.

Repeatability: In some instances the repeatability of the measurement is more important than the accuracy over the entire measuring range. It plays a very important role in the repeated measurement of the product. The repeatability of the length gauge is typically better than the values listed by Heidenhain.  Repeatability depends on: combinations of materials used in the components, installed electronics, optomechanics  used, and the bearing of the plunger. Typically the MT 1271 has a repeatability of 0.03 um.