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High-Precision Dual-Axis Stepper Motor Pan-Tilt Platform
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The High-Precision Dual-Axis Stepper Motor Pan-Tilt Platform is a two-axis positioning mechanism for robotics research, laboratory automation and precision motion-control development. It is available with MS42C standard stepper motors or MS42CG motors with GMR encoder feedback, and combines a 360° rotary structure, industrial deep-groove ball bearings, full-metal construction and D36A dual-channel stepper control.
Key Highlights
- Dual-axis stepper-motor positioning platform
- MS42C standard and MS42CG encoder-equipped motor options
- 1.8° full-step angle with approximately 0.05° theoretical microstep resolution at 32 microstepping
- MS42CG GMR encoder with 1024 PPR AB-phase, Z-index and PWM absolute-position feedback
- 360° flat-profile rotary-stage design
- Industrial deep-groove ball bearing and clamping coupler
- End-coupler load capacity up to 1 kg
- D36A dual stepper motor driver with STEP / DIR / EN control
- Python control examples and usage instructions provided
Product Overview
The platform uses a two-degree-of-freedom mechanical structure for controlled angular positioning. A flush-mount screw arrangement keeps the upper rotary surface free from protruding screw heads, supporting unobstructed 360° rotation.
The rotary assembly uses a deep-groove ball bearing, clamping-style coupler and full-metal structural components for research, education and laboratory motion-control applications.
Which Motor Configuration Should I Choose?
| Configuration | Feedback | Suitable Use |
|---|---|---|
| MS42C Standard | No integrated encoder | Basic stepper positioning and applications that do not require integrated angular feedback. |
| MS42CG with Encoder | GMR incremental and absolute feedback | Closed-loop positioning, speed-feedback experiments and applications requiring angular feedback. |
Stepper Motor Specifications
| Specification | MS42C | MS42CG |
|---|---|---|
| Motor Type | Stepper motor | Stepper motor with encoder |
| Weight | 283 g | 294 g |
| Step Angle | 1.8° | |
| Motor Construction | Two-phase hybrid stepper motor | |
| Rated Current | 1.68 A | |
| Resistance | 1.65 Ω | |
| Inductance | 3.2 mH | |
| Rotational Inertia | 50 g·cm² | |
| Holding Torque | 3.6 kg·cm | |
| Maximum Motor Speed | ≤3000 RPM, depending on control algorithm, driver and supply voltage | |
MS42CG GMR Encoder Feedback
The MS42CG integrates GMR magnetic sensing for closed-loop speed and position-control development. Incremental and absolute outputs are presented separately below to avoid conflating encoder sampling, pulse resolution and absolute-position accuracy.
| Encoder Feature | Specification |
|---|---|
| Sensing Technology | GMR magnetic sensing |
| Angular Sampling | 14-bit |
| AB-Phase Incremental Output | 1024 pulses per revolution |
| Z-Index Output | 1 pulse per revolution |
| Absolute Position Output | PWM |
| PWM Absolute Position Accuracy | 0.087° |
| Encoder Supply Voltage | 3.3–5 V |
| Encoder Connector | XH2.54 6-pin |
PWM absolute-position feedback allows angular position to be obtained after power-up without requiring a conventional re-zero procedure.
Mechanical Structure
- Two-axis positioning mechanism
- Flush-mount screw design on the rotary stage
- 360° mechanical rotary range
- Industrial deep-groove ball bearing
- Industrial clamping-style coupler
- Full-metal mechanical construction
- End-coupler load capacity: ≤1 kg
- Rear motor output shaft with integrated magnetic ring for encoder installation
D36A Dual Stepper Motor Driver
The D36A is a compact dual-channel stepper motor driver for independent control of two stepper motors. It supports forward and reverse rotation, adjustable microstepping and adjustable current settings.
| Specification | D36A |
|---|---|
| Dimensions | 50 × 50 mm |
| Weight | 31 g including cooling fan |
| Input Supply | 5.5–17 V |
| Logic-Level Input | 3.3–5 V |
| Continuous Drive Current per Channel | 0.55–1.44 A, 8-level adjustable |
| Motor Channels | 2 |
| Protection | Input reverse-polarity protection and 3.3 V short-circuit protection |
Control Interface
Each motor channel uses STEP, direction and enable signals. STEP commands are triggered on the rising edge, with each valid pulse advancing one configured microstep.
| Signal | Function |
|---|---|
| ST1 / ST2 | STEP pulse input for motor 1 / motor 2 |
| DIR1 / DIR2 | Motor direction control |
| EN1 / EN2 | Motor enable control; low level for sleep and high level for enable |
| ADC | Input-supply voltage sensing at 1/11 scale |
| 5V | 5 V power output |
| GND | Power ground |
The driver also provides supply-voltage sensing, power-input pass-through, protected 5 V and 3.3 V auxiliary power outputs and an integrated cooling fan.
Position Control and Development
With 32 microstepping, the 1.8° stepper motor provides an approximately 0.05° theoretical microstep resolution. Encoder-equipped configurations add incremental and absolute angular feedback for closed-loop control development.
Python control examples and operating instructions are provided for implementing angular positioning without requiring direct modification of the underlying motor-control logic.
Typical Applications
- Robotics research
- Dual-axis motion-control experiments
- Precision angular positioning
- Closed-loop motor-control development
- Laboratory automation prototypes
- Engineering education and robotics competitions
Key Features
Flush-Mount Screw Design for Unobstructed 360° Rotation
The rotary stage uses a flush-mount screw structure with no protruding screw heads on the rotating surface. This reduces mechanical interference and supports unobstructed 360° rotation for continuous pan-axis positioning.
Industrial-Grade Deep-Groove Ball Bearing
The rotary stage uses a deep-groove ball bearing to provide smooth rotational support with low operating noise and stable mechanical performance.
Rear Output Shaft with Integrated Magnetic Ring
The stepper motor includes a rear output shaft with a magnetic ring, providing a mechanical interface for encoder-based position feedback and related control configurations.
STEP, DIR and Enable Control Interface
The dual-motor driver provides independent STEP, direction and enable inputs for two stepper motors, together with power-ground, voltage-sensing and auxiliary power connections for embedded control integration.
Mechanical and Motion-Control Features
The platform combines a 1.8° stepper motor, encoder feedback option, industrial bearing and clamping-coupler structure in a full-metal mechanism designed for precision motion-control development.
Stable Rotary Bearing Structure
The large bearing-supported rotary base provides mechanical support for the pan axis and helps maintain smooth motion throughout the rotational range.
1024 PPR Incremental AB-Phase Output
The encoder-equipped MS42CG motor provides 1024-pulse-per-revolution AB-phase incremental output for motor-speed measurement and position-feedback applications.
14-Bit GMR Magnetic Encoder
The MS42CG uses GMR magnetic sensing with 14-bit angular sampling. It provides AB-phase incremental signals and PWM absolute-position output for closed-loop speed and position-control development.
Python Control Examples
Python control examples and usage instructions are provided for implementing angular-position commands and developing custom control workflows around the pan-tilt platform.
Dual-Axis Precision Positioning Platform
The two-degree-of-freedom pan-tilt structure combines stepper-motor actuation with a rigid rotary mechanism for robotics research, laboratory positioning and motion-control experiments.
Smooth Low-Speed Closed-Loop Operation
Encoder-assisted closed-loop control supports current-waveform regulation for smoother low-speed motion and reduced vibration during precision positioning.
End-Coupler Load Capacity up to 1 kg
The end coupler is specified for a load of up to 1 kg, providing a defined mechanical load reference when integrating cameras, sensors or experimental payloads.
Responsive Motion under Changing Loads
The closed-loop motor configuration supports rapid start, stop and direction changes while adjusting motor output in response to changing operating conditions.
Hybrid Stepper Motor Construction
The two-phase hybrid stepper motor uses bearing-supported construction and copper windings for stable operation in precision positioning and motion-control applications.
Absolute Position Feedback
PWM absolute-position feedback allows the controller to acquire angular-position information after power-up without requiring a conventional re-zero procedure.
Fine Microstep Position Control
The motor has a 1.8° full-step angle. With 32 microstepping, the theoretical microstep resolution is approximately 0.05°, supporting fine angular-position commands.
D36A Dual Stepper Motor Driver
The D36A provides two stepper-motor channels with adjustable current and microstepping settings, STEP/DIR/EN control inputs, auxiliary regulated outputs and an integrated cooling fan for compact dual-axis control systems.
Frequently Asked Questions
What is this pan-tilt platform designed for?
It is a dual-axis stepper-motor positioning platform for robotics research, laboratory motion-control development, precision angular positioning and engineering education.
How many motion axes does the platform provide?
The platform uses a two-degree-of-freedom pan-tilt structure for dual-axis angular positioning.
What stepper motor models are available?
The motor options shown are the MS42C standard stepper motor and the MS42CG stepper motor with encoder feedback.
What is the difference between MS42C and MS42CG?
MS42C is the standard stepper-motor version. MS42CG adds integrated encoder feedback for incremental and absolute angular-position sensing.
What is the motor step angle?
The motor has a 1.8° full-step angle. With 32 microstepping, the theoretical microstep resolution is approximately 0.05°.
What encoder technology is used on the MS42CG?
The encoder uses GMR magnetic sensing technology with 14-bit angular sampling.
What encoder outputs are available?
The encoder provides AB-phase incremental feedback, a Z-index reference signal and PWM absolute-position feedback.
What is the AB-phase encoder resolution?
The AB-phase incremental output provides 1024 pulses per revolution. The Z-index output provides one reference pulse per revolution.
What is the absolute-position accuracy?
The PWM absolute-position output has a specified angular accuracy of 0.087°.
Can the rotary stage rotate through 360°?
Yes. The flat-profile mechanical structure is designed to provide an unobstructed 360° rotary range.
What load can be applied at the end coupler?
The specified load capacity at the end coupler is up to 1 kg.
What is the D36A driver?
The D36A is a compact dual-channel stepper motor driver capable of controlling two motors with independently configurable direction, enable, current and microstepping settings.
What power supply does the D36A driver use?
The D36A accepts a 5.5–17 V input supply and uses 3.3–5 V logic-level control signals.
What control signals are used?
Each motor channel uses STEP, direction and enable control signals. A valid rising-edge STEP pulse advances the motor by one configured microstep.
Are Python control examples available?
Yes. Python control examples and usage instructions are provided for angular-position control.
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