GrabCAD 模型信息
Parametric Geneva Mechanism (Animated) · 模型 71183
I've been playing a lot lately with parametric designs, and this is my latest proof-of-concept. This method is called "Top Down Design", which means you start from the Assembly and then work your way down to each individual part. This simple model is controlled by 3 parameters in the Tools > Parameters section of the *assembly*. After editing those, the rest of the pieces should automatically update to show the changes, without having to go to each one independently. (Remember to regerenate the model after a parameter change in Model > Regenerate) The parameters are: A = drive crank radius N = driven slot quantity P = drive pin diameter The rest of the geometry is calculated according to the formulas in this video [http://www.youtube.com/watch?v=feA4ZfnTrSc]. It's actually much simpler that it appears! Everything else (thickness, chamfers, etc..) is calculated from simple relations to create a somewhat aesthetic model. * NOTE: If you try to modify the number of slots, it will most likely break. I have yet to find a way to automatically set new Cam & Follower coinstrains from the given parameters. If you know a method, please tell in the comment section! To set up new slots (or remove them) after changing the N parameter, go to Application > Mechanism to change the program's interface. From there you should see "Cams" under the model tree to see the current status of the links. To create a new one select Cams from the toolbox in the right of the screen, for CAM1 select the cylindrical surface of the pin and press Ok, and for CAM2 select the 3 surfaces making up the interior of the slot, select Ok and go to Options in the same window to check the box called "Enable Liftoff", or else the mechanism will get stuck and never rotate. PD. I know, I should probably make a tutorial sometime soon..
- 格式
- STEP / IGES、PTC Creo Elements、Rendering
- 分类
- Educational、Machine design、Miscellaneous
- 标签
- mechanism、geneva、parametric
- 数据更新
- 2026-09-30T16:41:11Z
