LM12UU 12mm Linear Motion Bearing for 3D Printer

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Component Name

Overview

The LM12UU 12mm Linear Motion Bearing is a type of linear motion system component designed specifically for 3D printing applications. It is a critical component in 3D printer designs, enabling smooth and precise linear movement of the print head, X-axis, or Y-axis. This bearing provides low friction, high accuracy, and reliability, making it an essential element in achieving high-quality prints.

Functionality

The primary function of the LM12UU 12mm Linear Motion Bearing is to facilitate linear motion in 3D printing systems. It allows the print head or axis to move smoothly and precisely along a straight path, ensuring accurate deposition of material and high-quality prints. The bearing achieves this by minimizing friction and providing a stable, consistent motion profile.

Key Features

Bore Diameter: The LM12UU has a bore diameter of 12mm, making it compatible with standard 3D printer shafts and axes.
Linear Motion: The bearing is designed for linear motion, providing smooth and precise movement along a straight path.
Low Friction: The bearing features a low-friction design, minimizing resistance and ensuring smooth motion.
High Accuracy: The LM12UU bearing provides high accuracy and repeatability, making it suitable for demanding 3D printing applications.
Reliability: The bearing is designed to withstand the rigors of continuous use, providing a reliable and consistent performance.
Compact Design: The LM12UU has a compact design, making it ideal for space-constrained 3D printer designs.
Easy Installation: The bearing is easy to install and integrate into 3D printer designs, simplifying the assembly process.
Durable Construction: The LM12UU is built with durable materials, ensuring a long service life and minimizing the need for maintenance or replacement.
Compatibility: The bearing is compatible with a wide range of 3D printer designs and configurations, making it a versatile component for various applications.

Specifications

Bore diameter

12mm

Outer diameter

21mm

Length

43mm

Material

Steel or Stainless Steel

Dynamic load rating

450N

Static load rating

900N

Operating temperature range

-20C to 120C

Applications

The LM12UU 12mm Linear Motion Bearing is commonly used in 3D printer designs, including

Cartesian 3D printers

Core XY 3D printers

Delta 3D printers

CNC machines

Robotics and automation systems

Conclusion

The LM12UU 12mm Linear Motion Bearing is a high-performance component designed specifically for 3D printing applications. Its low friction, high accuracy, and reliability make it an essential element in achieving high-quality prints. With its compact design, easy installation, and compatibility with various 3D printer designs, the LM12UU is a popular choice among 3D printing enthusiasts and professionals alike.

Pin Configuration

LM12UU 12mm Linear Motion Bearing for 3D Printer
Pinout Explanation and Connection Guide
The LM12UU 12mm Linear Motion Bearing is a widely used component in 3D printing and CNC machines, providing smooth linear movement and reducing friction. This documentation explains the pinout of the LM12UU bearing and provides a step-by-step guide on how to connect the pins.
Pinout Diagram:
The LM12UU bearing has a total of 4 pins, labeled as follows:
Pin 1: GND (Ground)
Pin 2: VCC (Power Supply)
Pin 3: IN1 (Input 1)
Pin 4: IN2 (Input 2)
Pin-by-Pin Explanation:
1. Pin 1: GND (Ground)
Function: Provides a ground connection for the bearing.
Description: This pin is connected to the negative terminal of the power supply or the ground plane of the circuit board.
2. Pin 2: VCC (Power Supply)
Function: Supplies power to the bearing.
Description: This pin is connected to the positive terminal of the power supply, typically +5V or +12V, depending on the system's requirements.
3. Pin 3: IN1 (Input 1)
Function: Controls the direction of movement (CW/CCW) and enables/disables the motor.
Description: This pin is connected to a microcontroller or a driver IC, which sends signals to control the motor. A high signal (>3.5V) on this pin enables the motor and sets the direction to clockwise (CW), while a low signal (<1.5V) disables the motor or sets the direction to counterclockwise (CCW).
4. Pin 4: IN2 (Input 2)
Function: Controls the step signal (pulse) for the motor.
Description: This pin is connected to a microcontroller or a driver IC, which sends pulse signals to control the motor's step movement. The frequency and duration of the pulse signal determine the motor's speed and movement.
Connection Guide:
To connect the LM12UU bearing to your 3D printer or CNC machine, follow these steps:
Connect Pin 1 (GND) to the negative terminal of the power supply or the ground plane of the circuit board.
Connect Pin 2 (VCC) to the positive terminal of the power supply (+5V or +12V).
Connect Pin 3 (IN1) to a microcontroller or driver IC output pin, which controls the motor direction and enable/disable signal.
Connect Pin 4 (IN2) to a microcontroller or driver IC output pin, which sends the pulse signal for motor step movement.
Important Notes:
Make sure to use a suitable power supply and motor driver IC for your system, as the LM12UU bearing requires a specific voltage and current range.
Properly insulate the connections and wires to avoid electrical noise and interference.
Ensure the motor is properly calibrated and configured before operating the system.
By following this documentation, you should be able to successfully connect and interface the LM12UU 12mm Linear Motion Bearing with your 3D printer or CNC machine.

Code Examples

LM12UU 12mm Linear Motion Bearing for 3D Printer

Overview

The LM12UU 12mm Linear Motion Bearing is a high-precision linear bearing designed for 3D printers and other applications requiring smooth and accurate linear motion. It features a compact design, high load capacity, and low friction, making it an ideal choice for various IoT projects.

Technical Specifications

Inner diameter: 12mm
 Outer diameter: 21mm
 Length: 43mm
 Load capacity: 20 kg (44 lbs)
 Precision: 0.01mm
 Material: Steel and POM (Polyoxymethylene)

Arduino Example: 3D Printer Bed Levelling

In this example, we'll demonstrate how to use the LM12UU bearing to create a smooth and precise 3D printer bed levelling system. We'll use an Arduino board, a stepper motor, and the LM12UU bearing to create a linear motion system.

Hardware Requirements

Arduino board (e.g. Arduino Uno)
 Stepper motor (e.g. NEMA 17)
 LM12UU 12mm Linear Motion Bearing
 3D printer bed
 Stepper motor driver (e.g. A4988)

Code Example
```cpp
#include <Stepper.h>

#define STEPPER_PIN_DIR 2
#define STEPPER_PIN_STEP 3
#define STEPPER_PIN_ENABLE 4

Stepper stepper(STEPS_PER_REVOLUTION, STEPPER_PIN_DIR, STEPPER_PIN_STEP);

void setup() {
  stepper.setSpeed(50); // Set stepper motor speed to 50 RPM
}

void loop() {
  // Move the 3D printer bed to the desired position
  stepper.moveTo(100); // Move 100 steps ( adjust according to your 3D printer bed travel)
  delay(1000); // Wait for 1 second
  stepper.moveTo(-100); // Move -100 steps
  delay(1000);
}
```
Raspberry Pi Example: Automated Linear Actuator

In this example, we'll demonstrate how to use the LM12UU bearing to create an automated linear actuator system using a Raspberry Pi. We'll use a Raspberry Pi, a DC motor, and the LM12UU bearing to create a linear motion system.

Hardware Requirements

Raspberry Pi
 DC motor (e.g. 12V, 100RPM)
 LM12UU 12mm Linear Motion Bearing
 Motor driver (e.g. L298N)
 Power supply

Code Example (Python)
```python
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)

# Define motor pins
MOTOR_PIN_DIR = 17
MOTOR_PIN_STEP = 23
MOTOR_PIN_ENABLE = 24

# Set up motor pins as output
GPIO.setup(MOTOR_PIN_DIR, GPIO.OUT)
GPIO.setup(MOTOR_PIN_STEP, GPIO.OUT)
GPIO.setup(MOTOR_PIN_ENABLE, GPIO.OUT)

def move_motor(steps, speed):
    # Set motor direction and enable
    GPIO.output(MOTOR_PIN_DIR, GPIO.HIGH if steps > 0 else GPIO.LOW)
    GPIO.output(MOTOR_PIN_ENABLE, GPIO.HIGH)

# Move motor
    for i in range(abs(steps)):
        GPIO.output(MOTOR_PIN_STEP, GPIO.HIGH)
        time.sleep(speed / 1000.0)
        GPIO.output(MOTOR_PIN_STEP, GPIO.LOW)
        time.sleep(speed / 1000.0)

# Disable motor
    GPIO.output(MOTOR_PIN_ENABLE, GPIO.LOW)

# Move the linear actuator 100mm
move_motor(100, 50) # Move 100 steps at 50ms per step
```
These examples demonstrate the versatility of the LM12UU 12mm Linear Motion Bearing in various IoT projects. By combining it with an Arduino board or a Raspberry Pi, you can create precise and smooth linear motion systems for 3D printers, automated linear actuators, and more.