High Precision Stepper Motor Goniometers

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bg series motorized goniometric cradles with 3 goniometer stages shown

Overview

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

See All Features

Products

Compare	Model	Compatibility	rankScore		Centered Load Capacity	Minimum Incremental Motion	Bi-directional Repeatability (Typical)	Maximum Speed	Maximum Torque	Availability	Price	Brand
BGS50PP Motorized Goniometer, ±30° Travel Range, Micro-step Drive, BGS50 $6,011 3 Weeks	BGS50PP Motorized Goniometer, ±30° Travel Range, Micro-step Drive, BGS50	UNIVERSAL	1.0	1.0	20 N	0.20 mdeg	±8 mdeg	4°/s	0.5 Nm	3 Weeks	$6,011	Newport
BGS80PP Motorized Goniometer, ±45° Travel Range, Micro-step Drive, BGS80 $7,312 In Stock	BGS80PP Motorized Goniometer, ±45° Travel Range, Micro-step Drive, BGS80	UNIVERSAL	1.0	2.0	60 N	0.20 mdeg	±2.5 mdeg	20°/s	1 Nm	In Stock	$7,312	Newport
BGM120BPP Motorized Goniometer, ±45° Travel Range, Micro-step Drive, BGM120 $13,003 10 Weeks	BGM120BPP Motorized Goniometer, ±45° Travel Range, Micro-step Drive, BGM120	IMPERIAL	1.0	3.0	200 N	2.0 mdeg	±12 mdeg	20°/s	6 Nm	10 Weeks	$13,003	Newport
BGM120BPE Motorized Goniometer, ±45° Travel Range, Full-step Drive, BGM120 $13,840 10 Weeks	BGM120BPE Motorized Goniometer, ±45° Travel Range, Full-step Drive, BGM120	IMPERIAL	1.0	4.0	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	10 Weeks	$13,840	Newport
BGM120PEBV6 Motorized Goniometer, ±45° Travel Range, Full-step, Vacuum, BGM120 $21,781 Contact Us	BGM120PEBV6 Motorized Goniometer, ±45° Travel Range, Full-step, Vacuum, BGM120	IMPERIAL	1.0	5.0	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	Contact Us	$21,781	Newport
BGM160BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step Drive, BGM160 $22,361 10 Weeks	BGM160BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step Drive, BGM160	IMPERIAL	1.0	6.0	300 N	2.0 mdeg	±12 mdeg	20°/s	16 Nm	10 Weeks	$22,361	Newport
BGM160BPE Motorized Goniometer, ±45 ° Travel Range, Full-step Drive, BGM160 $24,375 10 Weeks	BGM160BPE Motorized Goniometer, ±45 ° Travel Range, Full-step Drive, BGM160	IMPERIAL	1.0	7.0	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	10 Weeks	$24,375	Newport
BGM160PEBV6 Motorized Goniometer, ±45 ° Travel Range, Full-step, Vacuum, BGM160 $33,334 Contact Us	BGM160PEBV6 Motorized Goniometer, ±45 ° Travel Range, Full-step, Vacuum, BGM160	IMPERIAL	1.0	8.0	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	Contact Us	$33,334	Newport
BGM200BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step Drive, BGM200 $28,677 10 Weeks	BGM200BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step Drive, BGM200	IMPERIAL	1.0	9.0	500 N	2.0 mdeg	±12 mdeg	20°/s	17 Nm	10 Weeks	$28,677	Newport
BGM200BPE Motorized Goniometer, ±45 ° Travel Range, Full-step Drive, BGM200 $27,220 10 Weeks	BGM200BPE Motorized Goniometer, ±45 ° Travel Range, Full-step Drive, BGM200	IMPERIAL	1.0	10.0	500 N	2.0 mdeg	±12 mdeg	2°/s	29 Nm	10 Weeks	$27,220	Newport
M-BGM120BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step, M6, BGM120 $13,003 10 Weeks	M-BGM120BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step, M6, BGM120	METRIC	1.0	11.0	200 N	2.0 mdeg	±12 mdeg	20°/s	6 Nm	10 Weeks	$13,003	Newport
M-BGM120BPE Motorized Goniometer, ±45° Travel Range, Full-step, M6, BGM120 $13,840 10 Weeks	M-BGM120BPE Motorized Goniometer, ±45° Travel Range, Full-step, M6, BGM120	METRIC	1.0	12.0	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	10 Weeks	$13,840	Newport
M-BGM120PEBV6 Motorized Goniometer, ±45° Travel, Full-step, Vacuum, M6, BGM120 $21,781 Contact Us	M-BGM120PEBV6 Motorized Goniometer, ±45° Travel, Full-step, Vacuum, M6, BGM120	METRIC	1.0	13.0	200 N	2.0 mdeg	±12 mdeg	2°/s	10 Nm	Contact Us	$21,781	Newport
M-BGM160BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step, M6, BGM160 $22,361 10 Weeks	M-BGM160BPP Motorized Goniometer, ±45 ° Travel Range, Micro-step, M6, BGM160	METRIC	1.0	14.0	300 N	2.0 mdeg	±12 mdeg	20°/s	16 Nm	10 Weeks	$22,361	Newport
M-BGM160BPE Motorized Goniometer, ±45 ° Travel Range, Full-step, M6, BGM160 $24,375 10 Weeks	M-BGM160BPE Motorized Goniometer, ±45 ° Travel Range, Full-step, M6, BGM160	METRIC	1.0	15.0	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	10 Weeks	$24,375	Newport
M-BGM160PEBV6 Motorized Goniometer, ±45 ° Travel, Full-step, Vacuum, M6, BGM160 $33,334 Contact Us	M-BGM160PEBV6 Motorized Goniometer, ±45 ° Travel, Full-step, Vacuum, M6, BGM160	METRIC	1.0	16.0	300 N	2.0 mdeg	±12 mdeg	2°/s	20 Nm	Contact Us	$33,334	Newport
M-BGM200BPP Motorized Goniometer, ±45° Travel Range, Micro-step, M6, BGM200 $28,677 10 Weeks	M-BGM200BPP Motorized Goniometer, ±45° Travel Range, Micro-step, M6, BGM200	METRIC	1.0	17.0	500 N	2.0 mdeg	±12 mdeg	20°/s	17 Nm	10 Weeks	$28,677	Newport
M-BGM200BPE Motorized Goniometer, ±45° Travel Range, Full-step, M6, BGM200 $27,220 10 Weeks	M-BGM200BPE Motorized Goniometer, ±45° Travel Range, Full-step, M6, BGM200	METRIC	1.0	18.0	500 N	2.0 mdeg	±12 mdeg	2°/s	29 Nm	10 Weeks	$27,220	Newport

Show All

Notes:

DC Motor version is also available.

Specifications

Mini-Step Drive Goniometers for High Speed

Models	BGM120BPP	BGM160BPP	BGM200BPP
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 Type ¹	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	BGM120BPE	BGM160BPE	BGM200BPE
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	BGS50PP	BGS80PP
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)

Specifications

Mini-Step Drive Goniometers for High Speed

Models	BGM120BPP	BGM160BPP	BGM200BPP
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 Type ¹	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	BGM120BPE	BGM160BPE	BGM200BPE
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	BGS50PP	BGS80PP
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 CONEX-BGS50CC. 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

Features

Precision Multi-Axis Assemblies

Open Rotation Platform

Precision Worm Gear Drive

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

Vacuum Compatible Versions

Goniometric Cradle Load Characteristics

Compatible Controllers

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

XPS-RLD Motion Controller (2 or 4 Axis): Requires an XPS-DRV11 Driver Module.
XPS-D Motion Controller (2, 4, 6 or 8 Axis): Requires an XPS-DRV11 Driver Module.
ESP302 Motion Controller (1, 2, or 3 Axis): Plug and Play compatible with ESP302 Motion Controller.
For BGS-PP and BGM-PE only, SMC100PP* 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.

Compatible Controllers

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

XPS-RLD Motion Controller (2 or 4 Axis): Requires an XPS-DRV11 Driver Module.
XPS-D Motion Controller (2, 4, 6 or 8 Axis): Requires an XPS-DRV11 Driver Module.
ESP302 Motion Controller (1, 2, or 3 Axis): Plug and Play compatible with ESP302 Motion Controller.
For BGS-PP and BGM-PE only, SMC100PP* 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.

Accessories

Compatible Base and Top Plates

Description	Compatibility	Avail.	Price
M-PBN8 Base Plate, Used with UMR8 Series, MVN80 & UTR80 Series	UNIVERSAL	In Stock	$118
BGS50-BP Base Plate, BGS50 Stages	UNIVERSAL	4 Weeks	$213
UTS-TP Top Plate, UTS Stages with English Holes	UNIVERSAL	3 Weeks	$232