How to build a Slip Gear?

Hi! My name is Anthony Green and I am from Oxford, AL Oxford High School. We are trying to build a slip gear for our robot for the 2016 VEX StarStruck competition. If anyone has any detailed instructed or a very useful video of how to build a slip gear. Pleas add link below or email me at Angreen340@OxfordCitySchoolsonline.com. We really would like the help. Thank you!

Google using the site constraint is very helpful. Type the following in and you will get results just from the forum here.

site:vexforum.com slip gear

Here is one of the handy results…
https://vexforum.com/t/slip-gear/35759/1

Adding in grind teeth and this one pops up
https://vexforum.com/t/autodesk-inventor-help/16779/1