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Stable Element Mk 6, Ordnance Pamphlet 1063, 1944, describes the stable element that determines the pitch and roll of the ship and supplies this to the fire control computer.

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RESTRICTED
OP 1063
Stable Element Mk 6
A BUREAU OF ORDNANCE PUBLICATION
19 JANUARY 1944


STABLE ELEMENT Mk 6 - OP 1063

TABLE OF CONTENTS
 

Changes Front 2
LETTER OF PROMULGATION 3
INTRODUCTION 11
SECTION 1-TERMINOLOGY 15
Line of Sight 17
Training 17
Target Bearing-(Director Train-B'r) 17
Level Angle-L 17
Cross Level Angle-Zd 19
Speed Ratio-X 19
SECTION 2-FUNCTION of Stable Element 21
Level and Cross Level Angles 22
Firing the Guns 22
Inputs and Outputs 23
Mod. Chart 24
SECTION 3-FUNDAMENTALS 25
Properties of a Free Gyroscope 26
  Definition and Construction 26
  Rigidity of Plane 27
  Precession 27
    Rules for Precession 28
  Apparent Rotation 28
  Effect of Friction 28
  Effect of Latitude 29
  Compensation 29
Principle of the Differential 30
  Bevel Gear Type 30
  Planetary Type 31
  Use in Stable Element31
Synchro-Transmission Systems 32
  Synchro-Generator 33
  Synchro-Motor 33
  Differential Synchro 34


2
 
Principles of Electronics 35
  Vacuum Tubes 35
  Amplifiers 36
  Rectifiers 38
  Grid-Controlled Rectifiers 40
SECTION 4-APPLICATION of Fundamentals 43
The Gyroscope 43
  Mercury Control44
  Mercury Control Cutout Valve 45
  Cutout Valve Control 45
    So Unit 46
    Co Unit 47
  Latitude Correction 49
Synchro-Systems 51
Electronics 52
  Circuit Diagrams 52
    Stable Element 52A
    Control Panel 54A
  Follow-up Panel 56A
  Follow-up Theory 57
    Follow-up Coils and Magnet 57
    Follow-up Amplifiers 58
  Dry Rectifiers 59
  Grid-Controlled Rectifiers 59
    Biasing 60
  Hunting and Anti-Hunt Control 62
  Outline of Follow-up Action 65
SECTION 5-CONSTRUCTION 67
Stable Element Exterior 68
Stable Element Interior 71
The Sensitive Element 74
  The Gyroscope 75
  Latitude Correction System 76


3
 
  Follow-up Magnet 76
  Gimbal Mounting (Gyro Gimbal) 79
  Rotating Fork 79
  Level Gimbal 80
  Follow-up Coil Support 82
  Cross Level Gimbal 83
  Level Gear 84
  Cross Level Effect on Level 84
  Gimbal Relationships 86
  Sensitive Element Assembly 87
Bottom Chassis 88
  Follow-up Motors 90
  Synchronized Clutches 91
Angle Transmitting Units 93
  Principle 93
  Generated Dials 93
  Selected Dials 94
  Electrical Transmission 94
  Mechanical Transmission 94
Outputs of Stable Element 94
  Cross Level 94
  Level plus 1/30 Cross Level 95
  Continuous Level 95
Effect of Training 95
Manual Inputs and Controls 96
  Hand Cranks 96
  Magnetic Clutches 96
  elector Switch 97
  Dials 97
Functional Diagram 98
Functional Check Chart 99
Gear Diagrams 100
  Target Bearing Input 100
  Level Output 101
  Level Follow-up 102
  Cross Level Output 103
  Cross Level Follow-up 104
  Level plus 1/30 Cross Level Output 105
  Gimbal Rotation Gearing 105
  Overall Gear Diagram 106
Control and Follow-up Panels 107
  Mark 7 Mod 3 107
  Mark 8 Mod 6 109
  Amplifiers 110
  Cutout Valve Control 111
  Motor Generator 112


4
 
SECTION 6-INSTALLATION 113
Mounting 114
Leveling 114
Precautions 114
Mercury System 116
Electrical Connections 116
Aligning 117
  Dial Setting 118
Mechanical Couplings 118
Synchro-Generator Adjustment 118
SECTION 7-INSTRUCTIONS for Operating 119
Starting 120
Methods of Follow-up 122
Methods of Firing 123
  Continuous Fire 123
  Automatic Firing 124
  Hand Firing 124
  Firing Contacts 125
Sensitivity Adjustment 125
Securing 126
General Precautions 126
SECTION 8-MAINTENANCE 127
Lubrication 128
  Lubrication Log 131
Mechanical 132
Electrical 132
Routine Adjustments 133
SECTION 9-DISASSEMBLY and Reassembly 135
Removal of Top Plate 137
Removal of Sensitive Element 138
Removal of Top Section From Bottom Section 140
Disassembly of Bottom Section 146
Disassembly of Sensitive Element 158
Reassembly 166


5
 
SECTION 10-ADJUSTMENTS 167
1. Setting of Target Bearing Dials 168
2. Alignment of Gimbal Bearings 170
3. Maintenance of Mercury System 172
4. Neutral Equilibrium of Sensitive Element 173
5. Follow-up Magnet Axis 174
6. Positioning of North-South Level 175
7. Setting of Follow-up Coil Support 176
8. Balancing of Latitude Motor Level Platform 177
9. Adjustment of Latitude Motor Levels 178
10. Setting of Follow-up Motor Friction Clutches 178
11. Setting of Stops, Firing Contacts and Dials 179
12. Setting of 6G Synchro-Generators 183
SECTION 11-CASUALTIES 185
General 186
  Sensitive Element Fails to Settle 187
  Sensitive Element Shows Error on Turn 189
  Follow-up Fails Completely to Function 190
  Follow-up Tends to Run in One Direction 192
  Follow-up Hunts 193
  Follow-up Not Smooth 194
  Excessive Eccentricity 195
Follow-up Troubles 196
  C6A Tubes Do Not Fire 196
  Both C6A Tubes Passing Excessive Current 200
  One C6A Tube Passing Excessive Current 204
  Follow-up Not Sensitive and Dead Space Too Large 206
  Follow-up Goes Wild 207
Voltage Check Chart 208
Electrical Follow-up Circuits 212
Continuity Checks 213
Resistance Check Chart 214
Circuit Components 218
SECTION 12-INFORMATION 221
Spare Parts 222
Chart (A) Equipment Installed on Various Ships 224
Chart (B) Weights and Dimensions 227
Chart (C) Control Panel Equipment and Special Characteristics 228
Chart (D) Motors, Synchros and Dials of Stable Element 228
Chart (E) Holtzer-Cabot Motor Generator Specifications 229
Chart (F) Principal Drawings and Numbers 230
Exercising of Instrument 231
Distribution 232

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