AGC Goniometer Series


Design Features

  • ±45 degrees of rotary positioning with unobstructed 360 degree view of customer load
  • Stackable design with common rotation point
  • Precision worm-gear drive for outstanding accuracy and repeatability
  • Direct encoder option
  • Horizontal or vertical mounting orientation
  • High load capacity

AGC motorized mechanical goniometers are used in applications where 90 degrees of angular travel is needed with the payload at the center of rotation, or where two axes of rotation are needed about a common point. AGC goniometers are designed to be mounted to standard optical tables, as well as standard Aerotech rotary stages, to provide roll, pitch, and yaw about a common 3-axis intersection. This flexible stage series is ideal for optical alignment, payload tip/tilt, beam steering, sensor calibration, laser applications, automated manufacturing and/or testing, and multi-axis diffractometer systems.

Construction Features

The sizes within the AGC family are designed to be mounted on one another to form a three-axis rotary system with all three axes of rotation sharing a common intersection point. This allows compact pitch/roll/yaw systems to be created easily from a standard stage platform and without special adapter plates or mating fixtures. The drive mechanism for AGC stages is a precision gear and matched worm that are preloaded to reduce backlash. All AGC stages include optical limit switches and hard stops to define a ±45 degree range of travel.

Innovative feedback technology yields stable performance and negligible performance drift over the life of the stage. This is in stark contrast to inferior designs that must be continually adjusted to compensate for worm wear. All stage tabletops feature hardcoated aluminum, with stainless-steel Heli-Coil® inserts to prevent thread wear.

Flexible Options

Options include flexible motor selections as well as a direct encoder mounted along the stage travel to offer outstanding repeatability and to minimize hysteresis and backlash. Vacuum-compatible versions, for use in pressures as low as 10-6 torr, are also available.

Motor and Drives

Standard AGC stage configurations feature Aerotech’s brushless servomotors. A full range of matching drives and controls are available for a complete single-source solution.


Mechanical Specifications

Travel Range ±45°
Accuracy(1) ±12 arc sec
Resolution 3 arc sec
Bidirectional Repeatability(1) ±10 arc sec
Unidirectional Repeatability(1) ±5 arc sec
Tilt Error Motion 40 arc sec
Gear Ratio 152:1 192:1 288:1
Maximum Speed 30°/s
Nominal Radius of Rotation 125 mm 200 mm 300 mm
Distance from Tabletop to Rotation Point 85 mm 160 mm 245 mm
Maximum Torque (Continuous) 18 N-m 24 N-m 44 N-m
Load Capacity(2) Axial 20 kg 30 kg 50 kg
Moment 20 N-m 30 N-m 50 N-m
Stage Mass 5.6 kg 12.5 kg 24.3 kg
Material Aluminum Body/Clear Anodize Finish
MTBF (Mean Time Between Failure) 5000 Hours
  1. Certified with each stage. Requires direct encoder feeback with HALAR option and is tested with Aerotech controller.
  2. On-axis loading is listed.
  3. Specifications are for single-axis systems measured at the center of rotation. Performance of multi-axis systems is payload and workpoint dependent. Consult factory for multi-axis or non-standard applications.
  4. Load Center of Mass not to exceed bounding volume of 160 mm in diameter by 80 mm above pivot point.

Electrical Specifications

Drive System Worm-Gear Assembly
Feedback Rotary Encoder on Drive Motor and Noncontact Direct Encoder
Maximum Bus Voltage 320 VDC
Limit Switches 5 V, Normally Closed
Home Switch Near Limit
Motor Line Count (cnts/rev) Analog 1000 1000 1000
Digital 2500 2500 5000
Direct Encoder Radius (mm) 116.7 195.7 294.2
Electrical Resolution Motor Encoder Analog-Fundamental
(arc sec)
8.5263 6.7500 4.500
(arc sec)
0.8526 0.6750 0.2250
Direct Encoder Analog-Fundamental
(arc sec)
35.3496 21.0797 14.0221
Digital x50
(arc sec)
0.1767 0.1054 0.0701

Recommended Controller

Multi-Axis A3200/Npaq Ndrive CP20 Ndrive CP20 Ndrive CP20
Ensemble Ensemble CP20 Ensemble CP20 Ensemble CP20
Single Axis Soloist Soloist CP20 Soloist CP20 Soloist CP20


  • AGC-85 (Feedback Option Shown)
  • AGC-160 (Feedback Option Shown)
  • AGC-245 (Feedback Option Shown)
  • AGC-160-85 Stack (Feedback Option Shown)
  • AGC-245-160 Stack (Feedback Option Shown)

Ordering Information

Ordering Example

AGC -85 -LI90 -NC -BM -3 -AS

Ordering Options

Series Effective Radius of Curvature (mm)TravelLimitsMotorMotor OrientationEncoder Options
AGC -85
-LI10 to -LI50
-LI50 to -LI90

AGC Series Gear-Driven Goniometric Cradles

Option Description
AGC-85 Gear-driven goniometric cradle with 85 mm radius of curvature
AGC-160 Gear-driven goniometric cradle with 160 mm radius of curvature
AGC-245 Gear-driven goniometric cradle with 245 mm radius of curvature


Option Description
-LI10 to -LI50 Optional 10° to 50° of travel in 5° increments
-LI50 to -LI90 Optional 50° to 90° of travel in 10° increments (90° standard)


Option Description
-NO Normally-open limit switch
-NC Normally-closed limit switch


Option Description
-BM Brushless servomotor with connectors and encoder; AGC-85 (BM75-D25-E2500H), AGC-160 (BM130-D25-E2500H), and AGC-245 (BM200-D25-E5000H)
-BM-BK Brushless servomotor with connectors, digital square wave encoder and brake
-BM-AS Brushless servomotor with connectors and analog amplified sine encoder; AGC-85 (BM75-D25-E1000ASH), AGC-160 (BM130-D25-E1000ASH), and AGC-245 (BM200-D25-E1000ASH)
-BM-AS-BK Brushless servomotor with connectors, analog amplified sine encoder and brake
-NM No motor

Motor Orientation

Option Description
-0 No motor
-2 Bottom cable exit
-3 Forward side cable exit (standard orientation)
-4 Top cable exit
-5 Back side cable exit

Encoder Options

Option Description
-AS Direct encoder option, sine wave output
-X50 Direct encoder option, square wave output

Note: Using AGC stages with dual feedback loops will necessitate that the drive motor is outfitted with an amplified sine encoder and appropriate encoder interpolation (MXH, MXU, or MXR).