Heidenhain MT 60 Metro Length Gauges provide a 11uApp output and have ± 0.5um accuracy. The MT 60M is extended via motor, while the MT 60K is extended via gravity with a measuring length of up to 60mm.
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).
Motorized plunger actuation: The MT 60M length gauges feature an integral motor that moves the plunger. Required is a switch box, SG 101M, which is connected to the gauge where it can be operated up and down through the push of a button or over the connection of external actuation. Plungers cannot be moved by hand if the switch box is connected. The gauging force of these motorized length gauges is adjustable in three stages through the switch box. The force remains constant over the measuring range but depends on the operating orientation.
Gauging Force: MT 101M
· Downward: (0.7 N with SG 101V)
· Upward: (-)
· Horizontal: (0.7 N with SG 101 H)
External plunger actuation via gravity: The MT 60K plunger is freely movable. There is an optional coupling with a moving machine element for position measurements. The force needed to move the plunger specified ad required moving force.
Mounting: The MT 60 length gauges are fastened by two screws onto a plane surface. These screws ensure a mechanically stable installation of even these large gauges. Special holders are available for fastening the MT 60 to the MS 100 gauge stand for the Heidenhain Metro length gauge.
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 60: 0.06UM