Schneeberger Integrated Measuring System

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ABOUT PRODUCT

AMS Linear Guides with Integrated Measurement System

Product Overview

AMS 3B

MONORAİL AMS 3B MONORAİL MR roller profile guide is a integrated measurement system which has magneto-resistant.
This allows linear guidance to be used in machine tool applications and the compact design of axes together with distance measuring. Measuring system needs no additional installation or adjustment,that reduces expenses on machine design production and service. The accuracy of the machine and its reliability within the process have also been improved. Ruffed housing which is developed for the reading head has a protection system with sealing elements on the front and back.That protection provides optimum protection. AMS 3B is available both for analog and digital versions. AMSA 3B analog version has an interface with 1 Vpp voltage to connect all standart control systems and AMSD 3B is the basis of digital version. Profile gudieways are compatible for both versions. AMSD 3B version has a digital incremental interface and reading head variety. Options that allow different pixels provides the connection with deiiferent type of system frequencies.

AMS 4B

MONORAİL AMS 4B MONORAİL BM baller profile guide is a integrated measurement system which hs magneto-resistant.
As measurement, AMS 4B is at the same level with AMS 3B.
AMS 4B provides the same performance about mounting, cost saving, accuracy and reliability in the process.
AMS 4B is prefered to the applications with high speed, high acceleration and resistant against vibration.

AMSABS

MONORAİL AMSABS is an integrated, magneto-resistant distance measuring system with absolute interface.

AMSABS 3B MONORAİL MR is based on roller profile guide, beside AMSABS 4B is based on MONORAİL BM baller profile guide.
New features is added for the proven benefits of AMS products. These facilitate the use of distance measuring systems in industrial environments. Due to the absolute natüre of the distance measurement, there is no need for a refence mark after working. In this way users save time and also reduce costs. In addition, more data-progressing is expecting and that increases operational reliability. AMSABS has a interface that can connect with AMSABS SSI control units, SSI+SinCos control units and FANUC control units.

AMSA 3L

MONORAIL AMSA is an integrated magneto-resistive distance measuring system based on the MONORAIL MR roller guide profile with 3L analog voltage interface. This is the newest product of SCHNEEBERGER and is designed to use on very long axes.
AMSA 3L owes its performance in terms of both mechanical and measurement to the very precise construction process of the measuring rails. The special design of the rail inserts combined with the AMSA 3L reading head allows transitions between the rail joints and have the chance to extend the measurement axes as much as the desire. In the other features of AMSA 3L has interchangeable individual rails, cars and reading heads with integrated electronic systems. Through to special production process, AMSA 3L is able to cooperate with its components in most parts of the world. AMSA 3L has an analog voltage interface of 1 Vpp connected to common control systems.

System Characteristics

Integrated Lineer Measurement Systems

When high-precision measuring table combined with a MONORAIL guide rail, does not require any additional assembly or calibration, emerges a measurement system that has very simple integrated installation.
In this design of equipment, provides cost savings in production and maintance. SCHNEEBERGER offers integrated systems with high quality which is ready to installation.
Thus, direct distance measurement systems make complex machine axis production significantly simplifies.

Magneto-Resistant Measurement Method

Sensor, based on a specially adapted magneto-resistive measurement method.
When there is movement between the sensor and the measuring scale, field intensity change triggers a change that can easily measure in electrical resistance.
Reducing factors like temperature, overlapping magnetic fields, substitutions and aging by bridge circuit.
Reading head (enkoder), due to continuous contact operation, ensures that the functions of the sensor cannot be affected by any particles.
The measurement process works so well that there is no need to make any adjustments to the read head after the service change.

Distance Measurement Near Processing Center

Guideways with large connection surface on the base surfaces, on the one hand has an integrated measuring ruler, while on the other hand the rails are rigidly fixed to the machine bed.There is very good thermal transition between measuring system and machine bed.
The advantage of this system, the temperature in the machine bed is transferred directly to the measuring chart.
So from the measuring ruler to the guideway, from there, the machine bed is provided with good thermal transitions.
There is no need any reference of the systems (zero point)and heat sensor for reliable operation of process duration.

Thermal Expension Like Steel

The magnetic measuring scale is located inside the groove on the edge of the rail.
The using measuring scale is made of special compatible ferromagnetic material, therefore the guidway made of steel also expands when the measuring ruler expands longitudinally due to thermal effects.
The measuring ruler is fixed at both end sides of the rail and it follows the thermal expansion of the guide rail in the same way.
In the process of steel elements, no heat compensation needed.

A Reading Head for Every Size ( Enkoder )

Measuring scale, placed on the top of guideway surface on every different sized rails. Thus one reading head (enkoder), can be used for guideway from any size in the relevant product group.
The measuring scale is firmly fixed to the guide rail. Changes of the reading heads due to abrasion, availability guaranteed for all systems.
All reading heads, compatible with all supplied guideways. New generation reading heads have producted by increased waterproof class IP68 standard and it has been completely stainless. Also, connection elements are resistant to chemicals. SCHNEEBERGER AMS products, protects outstanding features from water, agressive coolant and even other emulsions in continuous exposure.

Protected Measuring Chart

After producting stage of integre measuring scale, scale is protected extremely hard with non magnetic sealing strip from mechanical damage and magnetic parasites .With a special production method, that sealing strip is fixing by laser welding.
Measuring scale is safely prevented against contact of liquids and abrasion.
This makes measuring scale easy to work properly.

Preparation And Delivery of Machine Axes As Sets

According to customer demand, SCHNEEBERGER products can be prepared as ready-to-install sets.
In this way, customers receive guideways and carriages as assembled and controlled sets according to their requirements. Products can be prepared with protection oil according to customer's request.
Processes to be made are limited as; alignment of the system to environmental construction, drive system connection, preparation of central lubrication connections and connect the reading head (encoder) to the control system.

Magneto-Resistant Measurement Method

Structure of the Measurement Ruler

The measuring strip contains two magnetic path structure: First path is placed at 200 μm intervals with precised incremental parts which has K & G poles and reference path for determining absolute position. Reference path can carry distance-coded signs, these markings are located at regular intervals, sometimes even a single reference mark can be found.
The measuring strip is fully integrated into the rail section. A groove (1) is first grinded into the ready-made rail section into which the strip (2) of a magnetic material is inserted.
This magnetic material is ground and magnetized (3). To protect the measuring ruler, a magnetically permeable, fully hardened sealing strip is used and welded to the rail by a laser (4).

Magneto-Resistive Position Sensor

The near-time movement between the sensor and the measuring scale results in a change in the field resistance of the magneto-resistant material. This changes the electrical resistance and the resistance can be easily measured. Eternal factors such as temparature, aging, and magnetic field interference are minimized by the electrical circuit system of Wheatstone bridge sensor. Two sine-shaped signals with a 90-degree phase shift, caused by incremental magnetization in the form of sickle-shaped sensor elements adjustment. To increase sensitivity, signals from 104 single elements are averaged in accordance with the measurement direction.Since the structure of the sensor is compatible with the magnetic split period, the parasite is highly resistant to magnetic effects.

Position of Sensor

All the characteristics (phase, amplitude difference, harmonic wave properties, etc.) which determine the accuracy of the measurement signals are processed into the sensor.Therefore, there is no reduction in signal quality even if there is a large change in the sensor position and torsion.
Circuit remains stable.
Among the advantages of sensor; measurement reading head can be removed (easily) without any adjustment, high resistance to vibration and impact, having a wide tolerance range in the operation of measuring heads can be countable.

AGC-Automatic Gain Control

The instantaneous amplitude (represented by periodic signals) is continuously determined by the electronic measuring system. In case of deviation, the amplitude is readjusted. Thus, even in the most exceptional cases (assembly faults, external factors or deceleration of the slider) it is delivered to the standard output signal.

Specifying Reference Point

The second path conveys the AMS reference points to determine the absolute position and report to the system. The precision of the reference points is decisive for the zero point of the machine. A reference point is represented by three magnetic reference marks during magnetization. Each of the descending and rising flaps of the reference pulses provides a reference information. No need for third reference information, this is only used to improve the operational reliability of the reference point identification system. This operational principle suppresses all types of magnetic interference, but does not give a reference signal even if there is interference or malfunction in suspicious situations.

Magnetization

AMS MONORAIL products are available with different reference marks on the surface by laser method. The next illustration shows the position of the measurement car when it records the first reference mark.

TR50   50 mm reference mark spaced AMS

TD50   Distance-marked AMS with reference mark
Placed reference marks with 50.2/49.8/50.4/49.6/50.6/49.4/../../... mm ranges

TD20  Distance-marked AMS with reference mark
Other reference marks are placed with 20.2/19.8/20.4/19.6/20.6/19.4/../../...mm ranges
This option is only used to measure lengths up to 2.8 meters.

Reading Head Position and Retaining Edges

In the order list, as in the above drawing, the SCHNEEBERGER includes the reference position of the reading head, the position of the measuring scale, the reference edges of the rail and the car. For drawings in a vertical page format, the displayed illustration must be rotated 90 ° counterclockwise. The following information should be used when placing an order.