AGC Gear-Driven Goniometers


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 (Minimum Incremental Motion) 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 feedback with calibration 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


  • AGC85 (Feedback Option Shown)
  • AGC160 (Feedback Option Shown)
  • AGC245 (Feedback Option Shown)
  • AGC160-AGC85 Stack (Feedback Option Shown)
  • AGC245-AGC160 Stack (Feedback Option Shown)

Ordering Information

AGC Series Gear-Driven Goniometers

Option Description
AGC85 Gear-driven goniometer, 85 mm radius of curvature
AGC160 Gear-driven goniometer, 160 mm radius of curvature
AGC245 Gear-driven goniometer, 245 mm radius of curvature

Travel (Required)

Option Description
-TR010 Limited travel, ±5 degrees
-TR015 Limited travel, ±7.5 degrees
-TR020 Limited travel, ±10 degrees
-TR025 Limited travel, ±12.5 degrees
-TR030 Limited travel, ±15 degrees
-TR035 Limited travel, ±17.5 degrees
-TR040 Limited travel, ±20 degrees
-TR045 Limited travel, ±22.5 degrees
-TR050 Limited travel, ±25 degrees
-TR060 Limited travel, ±30 degrees
-TR070 Limited travel, ±35 degrees
-TR080 Limited travel, ±40 degrees
-TR090 Limited travel, ±45 degrees

Motor (Optional)

Option Description
-M1 Brushless servomotor, 2500-line TTL encoder; AGC85 (BM75); AGC160 (BM130); AGC245 (BM200)
-M2 Brushless servomotor, 2500-line TTL encoder and brake; AGC85 (BM75); AGC160 (BM130); AGC245 (BM200)
-M3 Brushless servomotor, 1000-line 1 Vpp encoder; AGC85 (BM75); AGC160 (BM130); AGC245 (BM200)
-M4 Brushless servomotor, 1000-line 1 Vpp encoder and brake; AGC85 (BM75); AGC160 (BM130); AGC245 (BM200)

Motor Orientation (Required)

Option Description
-2 Bottom cable exit, optional orientation
-3 Left-side cable exit, standard orientation
-4 Top cable exit, optional orientation
-5 Right-side cable exit, optional orientation

Direct Rotary Feedback (Optional)

Option Description
-E1 Incremental encoder, 1 Vpp
-E2 Incremental encoder, digital TTL output, x50 multiplication

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).

Integration (Required)

Aerotech offers both standard and custom integration services to help you get your system fully operational as quickly as possible. The following standard integration options are available for this system. Please consult Aerotech if you are unsure what level of integration is required, or if you desire custom integration support with your system.

Option Description
-TAS Integration - Test as system
Testing, integration, and documentation of a group of components as a complete system that will be used together (ex: drive, controller, and stage). This includes parameter file generation, system tuning, and documentation of the system configuration.
-TAC Integration - Test as components
Testing and integration of individual items as discrete components. This is typically used for spare parts, replacement parts, or items that will not be used or shipped together (ex: stage only). These components may or may not be part of a larger system.