8mm Solid D Shaft 1000PPR Incremental Rotary Encoder PNP 5-24V

Specifications

• Resolution: 1000 PPR (Pulses Per Revolution)

• Operating Voltage: 5V to 24V DC

• Output Type: PNP

• Shaft Type: Solid Metal D-Shaft

• Shaft Diameter: 8mm

• Shaft Length: 16mm

• Body Diameter: 50mm

• Body Length: 68mm

• Mounting: 3x M3 Tapped Holes 

• Cable Length: 1000mm 

Key Applications and Projects

• Cut-to-Length Machines: Attaching a rubber measuring wheel to the 8mm shaft to accurately measure fabrics, wire, or sheet metal as it rolls off a spool, telling the PLC exactly when to activate the cutting blade.

• CNC Machining: Providing closed-loop feedback for custom milling machines or lathe spindles to verify actual RPM against target RPM.

• Heavy Robotics: Mounting to the joint of a large robotic arm to track the exact physical angle of the limb in real-time.

???? Unlock New Capabilities (Project Evolution)

• The Smart Filament Winder: Standard 3D printer filament winders just run blindly. Evolve your setup! Use a flexible coupling to attach this encoder to the spooling axis. Pair it with an Arduino (using a voltage divider if powering at 24V, or just power the encoder with 5V!). Write code that uses hardware interrupts to count the exact number of pulses. Now you can build an automated winder that spools exactly 1.0kg of filament every single time and automatically shuts off the motor!

Package Includes:

• 1 x Incremental Rotary Encoder 1000 PPR (8mm Solid D-Shaft, PNP Output)

• 1 x Integrated 1-Meter Shielded Cable

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What does 1000 PPR mean? PPR stands for Pulses Per Revolution. For every full 360-degree turn of the shaft, the encoder outputs 1000 digital pulses.

2. What is the diameter of the shaft? The solid metal shaft has an exact diameter of 8mm.

3. What is a PNP output? PNP is a "sourcing" output. When the encoder sends a pulse, it connects the signal wire internally to your positive power supply (VCC). If you power the encoder with 24V, the signal pulse will be 24V.

4. Can I use this directly with a 5V Arduino or Raspberry Pi? Yes, BUT with a strict condition: You must power the encoder with 5V. If you power the encoder with 5V, its PNP output will send 5V pulses, which are safe for an Arduino. If you power the encoder with 24V, the PNP output will send 24V pulses, which will instantly destroy your 5V microcontroller.

5. How do I safely read a 24V PNP signal with a 5V microcontroller? You must use an Optocoupler module or a simple resistor Voltage Divider circuit to step the 24V signal down to a safe 5V logic level.

6. Does this measure absolute position? No. This is an incremental encoder. It only tracks movement relative to where it started. If power is lost, it forgets its position.

7. What are the A and B phases? The encoder outputs two separate pulse streams (A and B) that are slightly offset from each other. By reading which pulse hits first, your controller can determine if the shaft is spinning clockwise or counter-clockwise.

8. Does it have a Z (Index) pulse? Yes, typical industrial incremental encoders have a Z phase. It outputs exactly one pulse per full revolution, which is incredibly useful for "homing" or calibrating a machine.

9. How do I mount this to my machine? The front silver faceplate features three M3 threaded holes arranged on a 40mm diameter circle. You can bolt this directly behind a custom metal bracket.

10. Can I connect this solid shaft directly to my motor's shaft? NO. Never rigidly connect two rotating shafts together. Tiny misalignments will destroy the bearings in the encoder. You must use an 8mm flexible coupling (like an aluminum spider coupling) between the motor and the encoder.

11. How fast can I spin this encoder? Industrial encoders of this type can safely track continuous speeds up to 3000-5000 RPM.

12. Why is my microcontroller missing pulses at high speeds? 1000 PPR at high RPMs generates thousands of pulses per second. If you are using standard code (like digitalRead in a generic Arduino loop), you will miss pulses. You must use "Hardware Interrupts" in your code to catch every pulse reliably.

13. How long is the attached wire? The integrated shielded cable is exactly 1000mm (1 Meter) long.

14. What do the wire colors mean? Typically, Brown/Red is VCC, Blue/Black is GND, Black/Green is Phase A, White is Phase B, and Orange is Phase Z. However, you must always verify the wiring diagram printed on the specific label of the encoder you receive.

15. Is this encoder waterproof? It is highly dust-resistant and splash-proof (usually IP54 to IP65), but it is not submersible. Do not hit the bearing seal with high-pressure water jets.

16. Can I cut the shaft to make it shorter? It is highly discouraged. Cutting the shaft can introduce metal shavings into the optical disk or apply excessive vibration that destroys the internal glass components.

17. Can I put a pulley directly on the shaft? Yes, you can attach a small pulley or measuring wheel. However, try to minimize extreme radial (sideways) load on the shaft to prolong the life of the bearings.

18. What is the difference between NPN and PNP? An NPN encoder pulls the signal wire down to Ground (GND) when active. A PNP encoder pushes the signal wire up to the positive supply voltage (VCC) when active.

19. What are the overall dimensions? The main cylindrical body is 50mm in diameter, the body length is 68mm, and the shaft protrudes an additional 16mm.

20. Does it need a pull-down resistor? Because this is a PNP (sourcing) output, yes, it often requires a pull-down resistor (e.g., 2k to 10k Ohm from the signal line to Ground) on your microcontroller input pin to ensure the signal cleanly returns to 0V between pulses.