belt-dat
open loop belt
GT2_Belt_6mm
闭环同步带
GT2-6-200（2mm pitch，6mm 宽，200mm 周长）
紧张方案
✅ 方案 2：惰轮张紧（最优雅） O ← 惰轮 / \ ==== ====
惰轮压在同步带背面
微调惰轮位置即可张紧
优点
中心距可固定
微调方便
张力可控
缺点：
多一个轮子
占空间
Compact closed-loop GT2 timing belt configuration and length calculation.
Overview
- Belt type: GT2 (2 mm pitch)
- Belt width: 6 mm
- Pulley teeth (both ends): 20T × 2 (1:1 drive)
- Center distance (C): 149 mm
Formulas
-
Pulley pitch diameter:
D = (T × P) / π
where
- D = pulley pitch diameter (mm)
- T = number of teeth
- P = belt pitch (mm)
-
Closed-loop belt length for two equal pulleys (1:1):
L = 2C + πD
where
- L = belt pitch-line length (mm)
- C = center distance between shafts (mm)
Example calculation (20T GT2 pulley)
-
Pulley pitch diameter:
T = 20 teeth P = 2 mm
D = (20 × 2) / π ≈ 40 / π ≈ 12.73 mm
-
Belt length:
L = 2 × 149 + π × 12.73 L ≈ 298 + 40 = 338 mm
Recommendation
- Preferred standard belt: GT2-6-340 (GT2, 6 mm width, 340 mm circumference) — strongly recommended.
- GT2-6-338 is not a standard size and is hard to source.
- Choose the 340 mm belt and use an adjustable tensioning mechanism (tensioner or idler) to take up the ~2 mm difference.
Summary (specifications)
- Pitch: GT2 (2 mm)
- Width: 6 mm
- Recommended belt circumference: 340 mm
- Pulleys: 20T × 2 (both ends)
- Center distance: 149 mm
Notes:
- Using a standard 340 mm belt simplifies sourcing and inventory.
- Use a tensioner to ensure proper belt tension and compensate for the small length difference.