High Precision Stepper Motor Goniometers

For tip and tilt applications, the BG series of goniometers allows open access to the load. When two BG stage are stacked together, the sample rotates about a common pivot point. These stepper motor goniometers are suited for applications that require higher output torque. Vaccum compatible versions up to 10^-6 hPa are also available.

±45° transverse axis rotation with maximum free access to the rotating platform
Stacked cradles provide orthogonal rotation about the same pivot point
Precision machined ball bearing races assure high stability and stiffness with minimal wobble
Precision ground worm gear provides 0.002° MIM
Stepper motor for higher torque, and 10^-6 hPa vacuum compatible versions available

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Showing 18 of 18 total products

Compatibility:

Description	Compatibility	Centered Load Capacity	Minimum Incremental Motion	Bi-directional Repeatability (Typical)	Maximum Speed	Maximum Torque	Avail.	Price
BGS50PPMotorized Goniometer, ±30° Travel Range, Micro-step Drive, BGS50	UNIVERSAL	20 N	0.20 mdeg	±8 mdeg	4°/s	0.5 Nm	In Stock	$6,266
BGS80PPMotorized Goniometer, ±45° Travel Range, Micro-step Drive, BGS80	UNIVERSAL	60 N	0.20 mdeg	±2.5 mdeg	20°/s	1 Nm	5 Weeks	$7,622
BGM120BPPMotorized Goniometer, ±45° Travel Range, Micro-step Drive, BGM120	IMPERIAL	200 N	2.0 mdeg	±12 mdeg	20°/s	6 Nm	10 Weeks	$13,556
BGM120BPEMotorized Goniometer, ±45° Travel Range, Full-step Drive, BGM120	IMPERIAL	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	10 Weeks	$14,428
BGM120PEBV6Motorized Goniometer, ±45° Travel Range, Full-step, Vacuum, BGM120	IMPERIAL	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	9 Weeks	$22,706
BGM160BPPMotorized Goniometer, ±45 ° Travel Range, Micro-step Drive, BGM160	IMPERIAL	300 N	2.0 mdeg	±12 mdeg	20°/s	16 Nm	10 Weeks	$23,311
BGM160BPEMotorized Goniometer, ±45 ° Travel Range, Full-step Drive, BGM160	IMPERIAL	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	10 Weeks	$25,410
BGM160PEBV6Motorized Goniometer, ±45 ° Travel Range, Full-step, Vacuum, BGM160	IMPERIAL	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	Contact Us	$34,750
BGM200BPPMotorized Goniometer, ±45 ° Travel Range, Micro-step Drive, BGM200	IMPERIAL	500 N	2.0 mdeg	±12 mdeg	20°/s	17 Nm	12 Weeks	$29,895
BGM200BPEMotorized Goniometer, ±45 ° Travel Range, Full-step Drive, BGM200	IMPERIAL	500 N	2.0 mdeg	±12 mdeg	2°/s	29 Nm	12 Weeks	$28,376
M-BGM120BPPMotorized Goniometer, ±45 ° Travel Range, Micro-step, M6, BGM120	METRIC	200 N	2.0 mdeg	±12 mdeg	20°/s	6 Nm	11 Weeks	$13,556
M-BGM120BPEMotorized Goniometer, ±45° Travel Range, Full-step, M6, BGM120	METRIC	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	10 Weeks	$14,428
M-BGM120PEBV6Motorized Goniometer, ±45° Travel, Full-step, Vacuum, M6, BGM120	METRIC	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	Contact Us	$22,706
M-BGM160BPPMotorized Goniometer, ±45 ° Travel Range, Micro-step, M6, BGM160	METRIC	300 N	2.0 mdeg	±12 mdeg	20°/s	16 Nm	10 Weeks	$23,311
M-BGM160BPEMotorized Goniometer, ±45 ° Travel Range, Full-step, M6, BGM160	METRIC	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	10 Weeks	$25,410
M-BGM160PEBV6Motorized Goniometer, ±45 ° Travel, Full-step, Vacuum, M6, BGM160	METRIC	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	Contact Us	$34,750
M-BGM200BPPMotorized Goniometer, ±45° Travel Range, Micro-step, M6, BGM200	METRIC	500 N	2.0 mdeg	±12 mdeg	20°/s	17 Nm	11 Weeks	$29,895
M-BGM200BPEMotorized Goniometer, ±45° Travel Range, Full-step, M6, BGM200	METRIC	500 N	2.0 mdeg	±12 mdeg	2°/s	29 Nm	12 Weeks	$28,376

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Notes:

DC Motor version is also available.

Compatible Controllers

Compatible motion controllers for these stepper motor driven stages are shown below:

XPS-RLD Motion Controller ( or Axis): Requires an Driver Module.
XPS-D Motion Controller (, , or Axis): Requires an Driver Module.
ESP302 Motion Controller (, , or Axis): Plug and Play compatible with ESP302 Motion Controller.
For BGS-PP and BGM-PE only, * Single Axis Motion Controller.

* Minimum incremental motion is 0.50 mdeg for BGS80PP with SMC100P controller.
Maximum speed is 0.8°/s for BGM-BPE with SMC100P controller.

Specifications

Mini-Step Drive Goniometers for High Speed

Models
Angular Range	-45 to +45°	-45 to +45°	-45 to +45°
Centered Load Capacity	200 N	300 N	500 N
Minimum Incremental Motion	2.0 mdeg	2.0 mdeg	2.0 mdeg
Uni-directional Repeatability (Typical)	±2.0 mdeg	±2.0 mdeg	±2.0 mdeg
Bi-directional Repeatability (Typical)	±12 mdeg	±12 mdeg	±12 mdeg
Accuracy, Typical	±25 mdeg	±25 mdeg	±25 mdeg
Maximum Speed	20°/s	20°/s	20°/s
Maximum Torque	6 Nm	16 Nm	17 Nm
Wobble, Typical	±100 µrad	±100 µrad	±100 µrad
Origin	Optical, centered	Optical, centered	Optical, centered
Origin Repeatability	±2.5 mdeg	±2.5 mdeg	±2.5 mdeg
Transversal Compliance	10 µrad/Nm	5 µrad/Nm	2 µrad/Nm
Feedback	Worm mounted rotary encoder with index pulse, 2,000 cts/rev	Worm mounted rotary encoder with index pulse, 2,000 cts/rev	Worm mounted rotary encoder with index pulse, 2,000 cts/rev
Encoder Resolution	0.001°	0.001°	0.001°
Limit Switches	Mechanical, at ± 45°	Mechanical, at ±45°	Mechanical, at ±45°
Rotation Axis Height	94 mm	146 mm	225 mm
Thread Type¹	1/4-20	1/4-20	1/4-20
Connectors	DB25M	DB25 - Male	DB25M
Cable Length	3 m	3 m	3 m
Weight	8.5 kg	18 kg	38 kg
MTBF	20,000 h (25% load, 10% duty cycle)	20,000 h (25% load, 10% duty cycle)	20,000 h (25% load, 10% duty cycle)

Notes:

Metric M- versions thread type is M6

Full-Step Drive Goniometers for High Torque and Vacuum Applications (V6 Models)

Models
Maximum Speed	2°/s	2°/s	2°/s
Maximum Torque	10 Nm	20 Nm	29 Nm

Notes:

All other BGM-BPE specifications are the same as the corresponding BGM-BPP goniometer.

Mini-Step Drive Goniometers for Smaller Loads

Models
Angular Range	-30 to +30°	-45 to +45°
Centered Load Capacity	20 N	60 N
Minimum Incremental Motion	0.20 mdeg	0.20 mdeg
Uni-directional Repeatability (Typical)	±0.5 mdeg	±0.5 mdeg
Bi-directional Repeatability (Typical)	±8 mdeg	±2.5 mdeg
Accuracy, Typical	±35 mdeg	±30 mdeg
Maximum Speed	4°/s	20°/s
Maximum Torque	0.5 Nm	1 Nm
Wobble, Typical	±100 µrad	±100 µrad
Origin	Optical, centered	Optical, centered
Origin Repeatability	±2.5 mdeg	±2.5 mdeg
Transversal Compliance	100 µrad/Nm	20 µrad/Nm
Limit Switches	Mechanical, at ±30°	Mechanical, at ±45°
Rotation Axis Height	20 mm	57.5 mm
Thread Type	8-32	1/4-20
Connectors	DB25 - Male	DB15 - Male
Cable Length	3 m	3 m
Weight	0.8 kg	2.1 kg
MTBF	20,000 h (25% load, 10% duty cycle)	20,000 h (25% load, 10% duty cycle)

Features

Precision Multi-Axis Assemblies

BG goniometers are designed so that two adjacent-sized models can be directly mounted orthogonally to each other (for example, BGS80 with BGM120) to pivot about the same point in space. The direct mounting capability saves set-up time, design time, and adapter plate costs. For additional rotation axes, a rotation stage can be mounted under the assembly or on the top BG platform. The video demonstrates an open access, multi-axis tip, tilt and rotation assembly with two BG goniometers and two rotation stages.

Open Rotation Platform

The BG series stages provide up to ±45° of transverse axis rotation enforced with mechanical limit switches. The stage is designed for maximum free access to the rotating platform, allowing for simplified stacking and mounting.

Precision Worm Gear Drive

Precise rotation is ensured by a precision ground, hardened worm gear drive. In addition to being non-backdrivable, the worm gear drive's advantages include higher MIM, repeatability, and overall accuracy.

Ball Bearings with Tool-Steel Races

Single-row ball bearings and precision-ground, hardened tool-steel races ensure smooth rotation with minimal wobble and eccentricity. This allows for higher load capacities, stiffness, and stability.

Stepper Motor Versions

The PP and BPP mini-step drive versions are for applications that require higher speeds. For higher torque and vacuum applications, the PE and BPE full-step drive versions are recommended.

Basic working principle of a stepper motor

CONEX Controller Version

Newport also offers a version of the DC motor, 50-mm² platform goniometer with integrated CONEX controller, the . For out-of-the box control, the CONEX controller is preconfigured and delivered with the BGS50CC goniometer.

Vacuum Compatible Versions

The (M-)BGM120PEBV6 and (M-)BGM160PEBV6 are the vacuum compatible versions of the BG stepper motor goniometers. They can be used in a vacuum environment down to 10^-6 hPa. Their performance is similar to their corresponding BGM-PE stepper motor goniometer.

Goniometric Cradle Load Characteristics

Accessories

Compatible Base and Top Plates

Description	Compatibility	Avail.	Price
M-PBN8Base Plate, Used with UMR8 Series, MVN80 & UTR80 Series	UNIVERSAL	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$124
BGS50-BPBase Plate, BGS50 Stages	UNIVERSAL	Contact Us	$222
UTS-TPTop Plate, UTS Stages with English Holes	UNIVERSAL	Contact Us FREE 2-day shipping on thousands of products on Newport.com Learn More	$242

Resources

High Precision Stepper Motor Goniometers

High Precision Stepper Motor Goniometers

Notes:

Compatible Controllers

Specifications

Mini-Step Drive Goniometers for High Speed

Notes:

Full-Step Drive Goniometers for High Torque and Vacuum Applications (V6 Models)

Notes:

Mini-Step Drive Goniometers for Smaller Loads

Features

Precision Multi-Axis Assemblies

Open Rotation Platform

Precision Worm Gear Drive

Ball Bearings with Tool-Steel Races

Stepper Motor Versions

CONEX Controller Version

Vacuum Compatible Versions

Goniometric Cradle Load Characteristics

Accessories

Compatible Base and Top Plates

Resources

Literature

Manuals

Technical Notes

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