30-Tooth GT2 Aluminum Timing Pulley - 5mm Bore for 6mm Belts

Specifications

• Tooth Profile: GT2 (Rounded)

• Tooth Count: 30 Teeth (30T)

• Inner Bore Diameter: 5mm

• Belt Width Compatibility: 6mm

• Outer Flange Diameter: 22mm

• Total Height: 17.5mm

• Toothed Area Height: 6.5mm

• Hub Height: 7mm

• Material: Aluminum Alloy

• Fixing Mechanism: 2 x M3 Set Screws (Grub Screws)

Key Applications and Projects

• High-Speed Laser Engravers: Upgrading the X and Y axes to 30T pulleys to dramatically increase the rastering speed of the lightweight laser diode carriage.

• Automated Pen Plotters: Utilizing the 60mm-per-revolution travel distance to draw long vector lines quickly.

• Geared Extruders: Acting as the larger driven gear in a custom 3D printer filament extruder, paired with a smaller 16T or 20T pulley on the motor.

Unlock New Capabilities (Project Evolution)

• The High-Speed Diode Laser Upgrade: Is your DIY laser engraver taking hours to burn a simple image? Evolve your machine! Laser carriages are extremely light, meaning they don't need much torque to move. Swap out your stock 20T motor pulleys for these 30T pulleys. Update your machine's firmware (steps/mm setting) to account for the new 60mm circumference. You have just instantly increased your machine's maximum travel speed by 50%, allowing you to burn images drastically faster while maintaining perfect GT2 anti-backlash precision!

Package Includes:

• 1 x 30-Tooth GT2 Aluminum Timing Pulley (5mm Bore)

• 2 x M3 Set Screws (Pre-installed in the hub)

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What does "GT2" mean? "GT2" stands for "Gates Tooth 2mm." It describes the rounded profile of the teeth and the exact 2mm distance (pitch) between the center of each tooth.

2. What size motor shaft does this fit? The internal bore is 5mm, which perfectly fits the standard 5mm shafts of NEMA 17 and some NEMA 14 stepper motors.

3. How many teeth does this pulley have? It has exactly 30 teeth.

4. What width of timing belt should I use? The toothed area is 6.5mm tall, designed specifically to hold standard 6mm wide GT2 timing belts.

5. How do I attach it to the motor shaft? Slide it onto the shaft, align one of the two set screws with the flat spot on your motor's "D-shaft", and tighten both screws down using an Allen key.

6. What size Allen key do I need? The M3 set screws typically require a 1.5mm hex/Allen wrench.

7. What is the outer diameter of the pulley? The widest part (the outer retaining flanges) measures 22mm in diameter.

8. How tall is the entire pulley? From the bottom flange to the top of the hub, it is 17.5mm tall.

9. What is the difference between a 20T and a 30T pulley? A 30T pulley is physically larger in diameter. Because it has more teeth, one full rotation of the motor will move the belt further (60mm vs 40mm).

10. Will a 30T pulley give my 3D printer more torque? No, it does the exact opposite. A larger pulley acts as a "higher gear." You gain top speed, but you lose mechanical pushing torque (resolution).

11. Will the belt slide off the top or bottom? No, the pulley features two flared outer flanges specifically designed to keep the 6mm belt tracked perfectly in the center.

12. Is this an idler pulley? No. Idler pulleys contain internal ball bearings and spin freely. This is a "Drive" pulley designed to mechanically lock to a rotating shaft.

13. Do I need to change my firmware settings if I upgrade to this? Yes. If you swap a 20T pulley for a 30T pulley on a 3D printer or CNC, you must recalculate and update your "Steps per mm" in your firmware, otherwise your machine will move the wrong distances.

14. Can I use this with a T2.5 belt? No. T2.5 belts have a square tooth profile and a 2.5mm pitch. They will not mesh with this GT2 pulley.

15. Why does my pulley wobble when the motor spins? Wobbling usually occurs if the motor shaft is bent, or if you overtightened one set screw on a perfectly round shaft without a flat spot, pushing the pulley off-center.

16. Can I drill the 5mm hole out to an 8mm hole? It is highly discouraged. Unless you use a metal lathe, a hand drill will not be perfectly concentric, and the pulley will wobble aggressively. Buy an 8mm bore pulley instead.

17. What material is this made of? It is precision-machined from a lightweight, durable aluminum alloy.

18. Can I use this on a completely round shaft (no flat spot)? Yes, but the set screws may eventually slip under heavy loads. It is highly recommended to file a small flat spot onto your motor shaft for the set screw to bite into.

19. How far will the belt move if my motor turns 1 full rotation (360 degrees)? Because the pitch is 2mm and there are 30 teeth, one full rotation moves the belt exactly 60mm.

20. Can I use 30T pulleys on my CoreXY printer? You can, but because CoreXY requires high torque and extreme precision for moving the heavy gantry, 16T or 20T pulleys are generally preferred over 30T.