Except for the automotive lift, right now all tools are basically first come, first served. For most tools this isn't a problem. Occasionally some of the more popular tools can get more than one person trying to use them, but in that case both members usually discuss their projects and can work out how best to share.
If you'll be using a tool for a long time, like say laser cutting a piece for several hours. It's good etiquette to post on the Google Group letting people know what you'll be using and for how long. This lets other members plan around you and avoid frustrations.
Stuff happens, even when you're careful. We get it. If a tool is broken, please email firstname.lastname@example.org to let the stewards know.
If you broke it, please own up to it. People may not be happy, but they'll respect you for admitting it. People will be way more upset if they come in and discover something is broken on their own. Besides, the Tool Stewards can't fix it until they know about it.
If it's something people aren't likely to realize is broken, print and post this on the tool so no one tries to use it: Tool Broken Flyer