# Yoyo CAD & Prototyping Adventures

**URL:** https://forums.yoyoexpert.com/t/yoyo-cad-prototyping-adventures/291547
**Category:** Yo-Yo Mods and Maintenance
**Created:** [August 7, 2018, 3:40pm UTC](https://forums.yoyoexpert.com/t/yoyo-cad-prototyping-adventures/291547 "2018-08-07T15:40:59Z")
**Posts on this page:** 1
**Showing post:** 12

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### Author: ![MarkD](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/markd/32/40845_2.png) [@MarkD](https://forums.yoyoexpert.com/u/MarkD)
#### Post date: [August 8, 2018, 1:07pm UTC](https://forums.yoyoexpert.com/t/yoyo-cad-prototyping-adventures/291547/12 "2018-08-08T13:07:24Z")

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Good progress! I think mono-metals are a lot easier to design, especially for a first one, which is why I’m focusing my time on that. I see you also rounded off the edge of the response, which is a good catch.

The outer edge of the rim looks sorta sharp - what’s the arc radius there?

For anyone else reading, here are some good resources to get started, a youtube tutorial series by Zach Lerner:

- Lesson 1: [The Guts](https://www.youtube.com/watch?v=7RmFeVW3wSk)
  - Lesson 1a: [Mass Moment of Inertia](https://www.youtube.com/watch?v=gb1UGeYnzwk)

- Lesson 2: [Design for Performance](https://www.youtube.com/watch?v=nxjcHN893CU)
- Lesson 3: [Limit State Design (Machinability)](https://www.youtube.com/watch?v=GD304FPDwf4)

Here are some general rules for wall thickness that I got from Jordan, the owner of [Smashing Yoyo Company](https://www.instagram.com/smashingyoyos/):

- 6al-4v grade titanium is 0.5mm
- 7075 is 1.0mm
- 7068 is like, 0.8 mm
- 6061 is 1.5 mm

He tends to add 25% unless he’s going for something extreme - too thin and it can warp during machining. Also, don’t create a thick part surrounded by two thin parts.

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