why do we set the compound rest at 29

why do we set the compound rest at 29

In this video I will demonstrate and show you the different methods of setting your compound rest for different types of threading
I will also show you the result of incorrectly setting your compound rest
in general we do not set our compound rest to 0 there are special circumstances and other styles of threads that you need to set your compound rest to 0 an example of that would be setting up to do multiple start threads

https://youtu.be/ZpOZFXaAVbM