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Linear Feedback Detector

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Environmental conditions

The environmental conditions of Linear MP Scale are as follows.

Items Conditions
Ambient temperature -10 to 70 deg.
Relative humidity Less than 95%
Vibration resistance Displacement amplitude 1.5mm, 10 to 55Hz
Impact resistance 55G 11msec
IP code IP67 Equivalent
Proof of coolant water, coolant oil and dew condensation Although it does not consider using MP scale in the situation of immersed in those, if immersed at short time, the function of Scale operates without problem.However, if they are poured for a long time, the rust may occur on Scale blank, and fault may occur.
Foreign material If aluminum foil is not striped or the pattern is not injured even if the foreign materials enter between Rotor and Stator, Scale operates without problem. However, since cutting chip becomes the factor which gives the crack, please protect with the cover etc.

Purpose and Selection of Linear MP SCALE

●For small machine, MPLN series nallow-type Linear MP SCALE

Feature

・Get high accuracy by mounting MP Scale at best position, as it is thin and narrow.

・Space saving with built-in preamplifier


Note)This scale is not connectable for long stroke.

Stroke

Stroke MPLN Series Scale length
175mm MPLN-25ASC 252mm
245mm MPLN-32ASC 322mm
375mm MPLN-45ASC 452mm
545mm MPLN-62ASC 622mm
Mounting example of Narrow type Linear MP Scale

Mounting example of Narrow type Linear MP Scale MPLN series



●For general machine, MPLZ series absolute Linear MP SCALE

Features

・High accuracy 5μm/1m

・Space saving by built-in preamplifier

・Connectable with various NC system


Note)This scale is not connectable for long stroke.

Stroke

Stroke MPLZ Series Scale length
150mm MPLZ-25BSC 252mm
400mm MPLZ-50BSC 502mm
650mm MPLZ-75BSC 752mm
776mm MPLZ-87BSC 878mm
900mm MPLZ-100BSC 1002mm
1150mm MPLZ-125BSC 1252mm
1400mm MPLZ-150BSC 1502mm
1650mm MPLZ-175BSC 1752mm
1900mm MPLZ-200BSC 2002mm
Mounting example of Standard type Linear MP Scale

Mounting example of standard type Linear MP Scale MPLZ series (Absolute type)


●For general machine MPLC series (Standard incremental type)

Features

・High accuracy 5μm/1m

・Space saving by built-in preamplifier.

・Absolute detection is possible, combining the battery back-up encoder on feed motor. ( In case of FANUC and MITSUBISHI CNC )


Note)This scale is not connectable for long stroke.

Stroke

Stroke MPLC Series Scale length
150mm MPLC-25BSC 252mm
276mm MPLC-37BSC 378mm
400mm MPLC-50BSC 502mm
526mm MPLC-62BSC 628mm
650mm MPLC-75BSC 752mm
776mm MPLC-87BSC 878mm
900mm MPLC-100BSC 1002mm
1026mm MPLC-112BSC 1128mm
1150mm MPLC-125BSC 1252mm
Mounting example of Standard Type Linear MP Scale MPLC series

Mounting example of standard type Linear MP Scale MPLC series


●For large machine,MPS-C series connectable-type Linear MP SCALE

Features

・High accuracy 5μm/1m

・Long stroke is possible by connecting up to 35m.


Stroke

MPS-C Series Scale length
MPS-25CSC 250mm
MPS-50CSC 500mm
MPS-75CSC 750mm
MPS-100CSC 1000mm

Mounting example of connectable Linear MP Scale MPS-C series

Mounting example of connectable Linear MP Scale MPS-C series

Scale length and Stroke

The stroke is value which subtracted 100mm from the sum total of the length of selected Scales.
Ex) When MPS-100CSC are 3 pieces and MPS-75CSC is 1 piece,Scale stroke is,
1000mm×3 pieces+750mm-100mm=3650mm
Note) Preamplifier is required.

Mounting position of a Linear MP Scale

We recommend not mounting Linear MP Scale by addition after the machine has been manufactured, but considering mounting of MP Scale and securing the mounting space at the design time. And also, we recommend directing that the mounting part is processed machining.
By selecting the good mounting position and directing the machining accuracy of the mounting part, the highly precise and the reduction of assembling man-hour can be obtained.

Selection of the mounting position and its example

We recommend that mounting position of Scale is chosen near the machining position.

●Example of Vertivcal Machining Center

The Scale position becomes near to the machining position by mounting Scale at the center of the guide of each axis, as shown in the next figure.

Example of Vertivcal Machining Center1

If the yawing occurs on the axis, there is little the influence in the good example, and it is large influence in the bad example.

Example of Vertivcal Machining Center2

●Example of Horizontal Machining Center

As shown in the next figure, when Scale are mounted at the center of the axes at the Y-axis and the Z-axis and Scale is mounted at the front of Bed at the X-axis, the Scale position will become near to the machining position, and so the influence of yawing becomes small.

Example of Horizontal Machining Center1

At the Z-axis of the Horizontal Machining Center in the above figure, even if the pitching occurs in the machine in case of good example, since Scale is mounted at the upper part of Bed, and the Scale position is close to the machining position, the influence of pitching is small.
In case of bad example, since Scale is mounted at the lower part of Bed, and the Scale position is far from the machining position, the influence of pitching becomes large.

Example of Horizontal Machining Center2

Example of mounting Linear MP Scale

●Example of the X-axis of Vertical Machining Center
The example used the Scale bracket and the Slider bracket is shown.

Example of the X-axis of Vertical Machining Center

●Example of the X-axis of Horizontal Machining Center

The example used the Slider bracket and mounting Scale to Bed directly is shown.

Example of the X-axis of Horizontal Machining Center

●Example of the Z-axis of Horizontal Machining Center(with cover)

The example that Scale is mounted at the nealy center of Bed with the Scale bracket, Slider is mounted with the Slider bracket and Scale and Slider are covered with cover is shown.
The Slider bracket connects to Slider through the lower part of the cover.

Example of the Z-axis of Horizontal Machining Center(with cover)

Details of mounting design of Linear MP Scale

The flatness of the plane mounting Scale is 0.05mm and the parallelism is 0.05mm with the guide.

●Example of X-axis of the large-sized machine

Example of X-axis of the large-sized machine

(In this example, Scale is mounted to Bed and Slider is mounted to Table which is the movable part. )

●Example of Z-axis of Horizontal Machining Center

The parallelism and the flatness are specified like the example of the following structure.

Example of Z-axis of Horizontal Machining Center

(In this example, Scale is mounted to Bed and Slider is mounted to Table which is the movable part. )

The parallelism and the flatness to the Scale bracket are specified.

Paerallelism of Scale bracket

Pitch adjustment for Linear MP Scale

When two or more segments of Scale are connected, the pitch accuracy adjustment of mounting segments is required.

Generally the laser measuring instrument is prepared, the machine movement is measured by laser measuring instrument, and the position of segments is adjusted so that the value detected by MP scale become the same as the value measured by the laser measuring instrument.

If the pitch accuracy of Scale segments is adjusted well, high long accurate Scale can be obtained.

Note) Please equalize the right and left space of the mounting bolt of the central segment, and then install Scale at the beginning
Note) The pitch adjustment of Scale is performed in an order from the central segment.

Pitch adjustment for Linear MP Scale
Pitch adjustment for Linear MP Scale

Accuracy measurement

●Accuracy measurement of full stroke Ⅰ

The accuracys of full stroke of forth and back directions are measured with constant pitch.
The accuracys in both Scale feedback and Encoder feedback are measured, and the effect of mounting Scale is confirmed.

Accuracy measurement of full stroke Ⅰ

●Accuracy measurement of full stroke Ⅱ

In the first-made machine, we recommend measuring three points of each axis and considering the yawing and pitching.

Ex)3 measureing points of in X axis of Horizontal Machining Center

1)Compare X3 with X2 and calculate the yawing.
2)Compare X1 with X2 and calculate the pitching.

Accuracy measurement of full stroke Ⅱ

contact

Business contact: Strategic Sales Operation Department
Phone: +81-75-861-3313

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