GrabCAD 模型信息
Classic Escapement - Graham (Ideal) · 模型 273123
Based on the book CLOCK AND WATCH ESCAPEMENT MECHANICS by Mark V. Headrick (Copyright 1997) as a fine source, I try to present rigorously the essence of escapement design. The book is public (http://www.nawcc-index.net/Articles/Headrick-EscMechanics.pdf), so you can read and compare (with the book) everything I present here. My intention is to create a series of projects dedicated to this subject - as you will see - but only concerning the geometrical aspects. Actually, you can use my projects as accurate simulations for understanding the book. I recommend you download the book in order to use it when your computer is offline. All parts, assemblies, and simulations/animations are made with Inventor 2014, so some specific references are bonded to this software. As you can learn from the book, there are three classical kinds of escapement mechanisms: Graham (dead-beat), Recoil, and the Swiss Lever. The term „dead-beat” is explained in the book on page 21. Actually, due to their circular shape, the palette arms slid along the wheel teeth, so the wheel is stationary during the lock time. More details can be found here: https://youtu.be/D9UT6YwzmBU. By contrast, the recoil escapements permit a certain backward rotation of the wheel, so the reel is practically „recoiled” during the lock time. This effect could be noticed in my previous project https://grabcad.com/library/escapement-macdowall-305-1. A great recoil can be noticed also in my former (original) project https://grabcad.com/library/escapement-non-slip-pawls-solution-1. We start here with the Graham (dead-beat) escapement. The first step is to create the geometry of two parts: the wheel and the palette, as the main interconnected parts of the mechanism. The geometry has a first version - the Ideal mechanism. The Ideal version is very tight, with no clearance, and its purpose is to establish the geometry of the two parts. After considering this version, we shall slightly modify the palette in order to make the mechanism functional. This is why I present two different projects: the Ideal Graham escapement (this one), and Modified Graham escapement (the next one). This first project is explained in the book till page 11: „5: The Importance of the Simulation”. Firstly you have to look at the picture showing the Inventor sketch „Wheel - Palette.jpg”. The picture explains how the geometrical construction is made. The facet of the wheel tooth is 0.5 degrees (not mm). You have to consider the diamond-s...
- 格式
- Autodesk Inventor、Rendering、STEP / IGES、STL
- 分类
- Educational、Hobby、Machine design
- 标签
- graham、escapement、dynamic、autodesk、simulation、inventor、design、mechanical
- 数据更新
- 2026-10-14T15:52:42Z