Microsoft SHG-VS, SHG-TS, SHG-A, SHG-TC User Manual

SHG-A* Absolute, SHG-TC, SHG-TS & SHG-VS

Linear Encoders

NEWALL MEASUREMENT SYSTEMS LTD

Installation Manual

THIS MANUAL SHOULD BE USED IN CONJUNCTION WITH WITH THE

CORRESPONDING PROTOCOL DOCUMENT

Newall Measurement Systems

Contents

CONTENTS

1.0 Technical Specification..............................................1

1.1 Bracketry ..............................................................................2

1.2 Preparation ..........................................................................2

1.3 Warnings ..............................................................................2

2.0 Encoder Assembly ....................................................3

3.0 Mounting The Reader Head ......................................3

4.0 Mounting The Scale....................................................4

4.1 Double End Mounting ..........................................................4

4.2 Single End Mounting ............................................................6

4.3 Scales in Excess of 2.5 Meters............................................7

5.0 Fitting The Scale Guard ............................................9

6.0 Cable Routing ..........................................................10

7.0 Final Check................................................................10

Appendix A - Scale Bracket Mounting Options ............11

Appendix B - Dimensional Drawing ................................12

Introduction

Newall Measurement Systems

1.0 INTRODUCTION

This manual will provide connection and mounting instructions for Newall's Absolute, Digital and Distance Coded linear encoders. It is important that you read and understand this manual prior to commencing the hardware installation. Electronic specifications can be found in the corresponding integration manual.

If you have any questions relating to this manual or installation contact Newall or your local authorised Newall representative.

1.1 Bracketry

Due to the variety of machine types and applications, it may be necessary to design, make and fit custom brackets for the linear encoder assembly. If custom brackets are needed, make certain they are rigid enough not to allow any flexing or distorting while the machine is in operation. Newall offers a variety of bracket kits to aid in the installation. Contact Newall or your local authorised representative for details.

1.2 Preparation

Prior to beginning the installation the machine should be studied to determine where the linear encoder(s) will be fitted.

In order to reduce erroneous readings caused by machine wear, it is recommended that the scale be fitted as close to the machine lead screw or axial drive shaft as possible.

The actual overall scale length is approximately 258mm (10.1") longer than the stated scale travel on these SHG encoders (e.g. if SHG travel length is 40", the overall length of the scale will be 50.1").

For SHG-TS and SHG-VS outboard mounting of the scale support brackets will add approximately 20mm (3/4") to the effective scale travel (Refer to Appendix A).

For a more compact installation, scale travels of 300mm (12") or less may be fitted by supporting one end of the scale only by use of a single end mounting block (Refer to Figure 6.4 and 6.10).

The moving member of the linear encoder assembly can be either the reader head or the scale.

Cable routing from the reader head should be examined (See Section 8). Each reader head is provided with either a 3.5 meter (11.5') or 7 meter (22') cable. Extension cables are available in 1 meter (3'), 2 meter (6.5'), 3.5 meter (11.5'), 5 meter (16.5') and 10 meter (32') lengths. Contact Newall or your local authorised representative for details.

1.3 Warnings

If for any reason the machine axis travel is greater than the actual scale travel, it is recommended that ‘mechanical stops’ are fitted to the machine to avoid damage caused by over travel. Newall will not accept responsibility for scale and reader head damage caused by machine over travel.

Both the reader head and the scale are precision made components and it is important that they are handled with care. By design, the linear encoders can withstand the rigors of the harsh workshop environment. However, permanent damage can occur through bending or severe impact.

It is important that the scale be kept at least 13mm (0.5") away from any magnetic bases on indicators or magnetic chucks.

Figure 3.1 - Alignment of the reader head

2.0 ENCODER ASSEMBLY

Item Description

1 Reader Head 2 Scale 3 Scale Support Link 4 Scale Anchor Pin 5 Support Pillar Short

Item Description

6 Support Pillar Long 7 Scale Cover 8 M5 Nut 9 M8 x Socket Button Head

Newall Measurement Systems

Encoder Assembly / Mounting the Reader Head

3.0 MOUNTING THE READER HEAD

Mount the reader head together with its bracket(s) to the machine and secure the assembly parallel with axis travel to within +/-0.05mm (0.002"), (Refer to Figure 3.1).

Final adjustments can be carried out by use of laminated shims, which are included with each transducer assembly. Each layer of shim is equivalent to 0.05mm (0.002").

Less than 2.5m (100”)

Mounting the Scale

Newall Measurement Systems

4.0 MOUNTING THE SCALE

4.1 Double End Mounting

Note: Refer to section 4.3 for mounting scales in excess of 2.5 metres.

Each end of the scale is different and can be identified by the “calibration adjustment end” and the “fixed end.

NOTES:

(A) Erroneous readings will occur if the reader head is allowed to travel beyond the effective travel limits

(Refer to Figure 4.1).

(B) The pre-load on the balls are factory set via the set screw at the calibration adjustment end.

Caution: Do not tamper with or adjust the set screw as this will alter the calibration and accuracy specification of the scale and void the warranty (Refer to Figure 4.1).

Once the reader head is secured and correctly aligned, the scale support brackets can now be fitted. The scale support brackets consist of the support pin, the support link and the pillar(s).

Traverse the machine to its maximum position toward the non-cable entry side of the reader head. Maximum position means all available travel, including hand winding past any electrical limits or trip dogs.

Carefully slide the scale or setup tube through the reader head, allowing for a sufficient amount of scale to project from the reader head in order to fit the scale support brackets. Note: If the scale travel is more then 60" it is recommended that a setup tube is used for alignment to avoid accidental damage to the actual scale tube.

Assemble the scale support link to the scale support pin leaving approximately 3mm (1/8") gap between the bottom of the pin shoulder and the top of the link.

Slide the link/pin assembly onto the scale to approximately 5mm (0.2") away from the end of the reader head.

Transfer punch through the support link and into the machine casting. It is important that the support link is kept square to its mounting surface at all times.

Remove the link/pin assembly and the scale from the reader head. Drill and tap M8 x 18mm deep (USA 5/16 - 18 x 3/4" deep) into the machine casting as marked by the transfer punch. Fit the pillar(s) to the machine casting by using one of the methods shown in Figure 4 .3. The pillar should fit square and flush to the machine surface.

Figure 4.1 -Scale

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