mech

-- [[fab-dat]] - [[fab-PCB-dat]] - [[fab-PCBA-dat]] - [[fab-stencil-dat]] - [[fab-workspace-dat]]

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-# belt-sys-dat

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-- [[timing-pulley-dat]] - [[idler-dat]] - [[belt-dat]]

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-

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-## ref

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-- [[belt-sys]]

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-

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-# belt-dat

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-## open loop belt

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-GT2_Belt_6mm

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-

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-## 闭环同步带

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-GT2-6-200（2mm pitch，6mm 宽，200mm 周长）

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-

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-## 紧张方案

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-✅ 方案 2：惰轮张紧（最优雅）

- O ← 惰轮

- / \

-==== ====

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-

-惰轮压在同步带背面

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-微调惰轮位置即可张紧

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-优点

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-中心距可固定

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-微调方便

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-张力可控

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-缺点：

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-多一个轮子

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-占空间

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-Compact closed-loop GT2 timing belt configuration and length calculation.

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-## 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

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-## Formulas

-- Pulley pitch diameter:

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- D = (T × P) / π

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- where

- - D = pulley pitch diameter (mm)

- - T = number of teeth

- - P = belt pitch (mm)

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-- Closed-loop belt length for two equal pulleys (1:1):

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- L = 2C + πD

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- where

- - L = belt pitch-line length (mm)

- - C = center distance between shafts (mm)

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-## Example calculation (20T GT2 pulley)

-1. Pulley pitch diameter:

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- T = 20 teeth

- P = 2 mm

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- D = (20 × 2) / π ≈ 40 / π ≈ 12.73 mm

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-2. Belt length:

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- L = 2 × 149 + π × 12.73

- L ≈ 298 + 40 = 338 mm

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-## 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.

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-## Summary (specifications)

-- Pitch: GT2 (2 mm)

-- Width: 6 mm

-- Recommended belt circumference: 340 mm

-- Pulleys: 20T × 2 (both ends)

-- Center distance: 149 mm

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-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.

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-# timing-pulley-dat

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-

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-- [[pulley-dat]] - [[pulley-drive-dat]] - [[pulley-drive-dat]]

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-

-| modes | category | teeth | inner diameter | belt width | note |

-| :------------- | :------- | :---- | :------------- | :--------- | :---: |

-| GT2_20T_8B_6mm | 2GT | 20 | 8 | 6 | - |

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-

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-### GT2_Timing_Pulley_20T_8B_6mm v8

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-The **GT2 Timing Pulley 20T 8B 6mm (v8)** refers to a specific type of timing pulley used in belt-driven motion systems, often found in 3D printers, CNC machines, and other precision mechanical setups. Here’s a breakdown of its specifications:

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-- **GT2**: Refers to the pulley type designed for **GT2 timing belts**, which have a 2mm pitch (distance between teeth). This type is commonly used in applications requiring precise movement and low backlash.

-- **Timing Pulley**: A mechanical component with teeth that engage with a timing belt to transfer motion with high accuracy.

-- **20T**: This pulley has **20 teeth**, which affects the step resolution and speed of the driven mechanism.

-- **8B**: Indicates an **8mm bore diameter**, meaning it fits shafts with an 8mm diameter.

-- **6mm**: This refers to the **belt width** it is compatible with, which is typically a **6mm-wide GT2 timing belt**.

-- **v8**: This likely refers to the **version** or **design iteration** of the pulley.

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-This pulley is commonly used in precise motion control applications like 3D printing, where smooth and accurate belt-driven motion is needed. Let me know if you need further details! 🚀

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-## GT2_Timing_Pulley_20T_8B_6mm

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-- **GT2**: Refers to the tooth profile – 2 mm pitch (distance between teeth), ideal for precise motion control (e.g., 3D printers).

-- **20T**: 20 Teeth – the pulley has 20 teeth around its circumference.

-- **8B**: 8 mm **inner bore diameter** (fits an 8 mm shaft).

-- **6mm**: **Belt width** – designed for 6 mm wide GT2 timing belts.

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-## Summary:

-This is a 20-tooth GT2 pulley with an 8 mm bore, suitable for 6 mm belts. It's commonly used in 3D printers, CNC machines, and robotics for accurate belt-driven motion.

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-https://cad.onshape.com/documents/707b8372a3c9ced9cde96289/v/ee73401f89c866bc22119094/e/19e0ed0d5720546e9089804c?showReturnToWorkspaceLink=true

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-- measured witdth = 9 mm

-- measured hole = 5 mm

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-

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-## GT2_Timing_Pulley_20T_8B_5mm

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-the following images show inner hole 5mm, not 6mm

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-

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-## timing pulley VS. Coupler

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-### 🔧 1. Function

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-| Aspect | **Timing Pulley** | **Idler Pulley** |

-| ------- | ------------------------------------------------- | ------------------------------------------------ |

-| Purpose | Transmits power between shafts via timing belt | Guides or maintains tension in the belt |

-| Motion | Rotates with and drives the shaft it's mounted on | Usually free-spinning (not connected to a motor) |

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----

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-### 🔁 2. Power Transmission

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-| Aspect | **Timing Pulley** | **Idler Pulley** |

-| -------------- | ----------------------------------------------- | ------------------------------------------- |

-| Power Transfer | Yes – transfers torque and synchronizes timing | No – only redirects or tensions the belt |

-| Engagement | Toothed belt fits precisely to prevent slippage | May or may not be toothed; sometimes smooth |

-

----

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-### ⚙️ 3. Mounting and Design

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-| Aspect | **Timing Pulley** | **Idler Pulley** |

-| -------------- | -------------------------------------- | ------------------------------------------- |

-| Shaft Mount | Mounted on driven or driving shaft | Mounted on a stationary or pivoting bracket |

-| Size Variation | Chosen for gear ratio and torque needs | Chosen based on tensioning or routing needs |

-

----

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-#### 🛠️ Example Scenario

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-In a **3D printer or CNC machine**, the motor uses a **timing pulley** to drive a toothed belt, while an **idler pulley** on the other side keeps the belt tight and correctly aligned.

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-## ref

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-- [[timing-pulley]]

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-# pulley-drive-dat

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-

-- [[pulley-dat]] - [[pulley-drive-dat]] - [[pulley-drive-dat]]

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-- 普通版（16齿高14)内孔5mm

-- 普通版（20齿高16)内孔5mm

-- 普通版（20齿高16)内孔6.35mm

-- 普通版（20齿高16)内孔8mm

-- 普通版（20齿带宽6)内孔6mm

-- 普通版（20齿高16)内孔4mm

-- 普通版（16齿高14)内孔6mm

-- 高品质（16齿高14)内孔5mm

-- 高品质（20齿高16)内孔5mm

-- 高品质（20齿高16)内孔6.35mm

-- 高品质（20齿高16)内孔8mm

-- 高品质（20齿带宽6)内孔6mm

-- 30齿内孔5mm（带宽6mm）

-- 30齿内孔8mm（带宽6mm）

-- 36齿内孔5mm（带宽6mm）

-- 36齿内孔6.35mm（带宽6mm）

-- 36齿内孔8mm（带宽6mm）

-- 40齿内孔6.35mm（带宽6mm）

-- 40齿内孔5mm（带宽6mm）

-- 40齿内孔8mm（带宽6mm）

-- 40齿内孔10mm（带宽6mm）

-- 40齿内孔12mm（带宽6mm）

-- 80齿内孔5mm（带宽6mm）

-- 80齿内孔5mm（带宽6mm）黑色

-- 40齿/内径5mm带宽10

-- 16齿内孔5mm高20带宽10

-- 20齿内孔5mm高19带宽10

-- 20齿内孔6.35mm高19带宽10

-- 20齿内孔8mm高19带宽10

-- 20齿内孔6.35mm带宽10外径14

-- M3扳手【适用16齿同步轮】

-- M4扳手【适用20齿及以上同步轮】

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-# idler-dat

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-

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-- [[pulley-dat]] - [[pulley-drive-dat]] - [[pulley-drive-dat]]

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-## GT2_Idler_20T_5B_6mm

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-

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-## ref

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-- [[idler]]

-- [[belt-sys-dat]]

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-- [[sheet-dat]]

-- [[frame-dat]]