I thought that too. 
Never, ever drill a hole in a block of wood unless it is clamped down. Our team captain lost a large part of her finger this way. ::safety::
Last year we were cutting a piece of plywood on a table saw. The newly cut piece of wood got lodged between the saw blade and the sliding guide and shot 20ft clear across the shop making a large hold in the wall.
Lexan + same set-up + me standong there = Ouch
Make sure everything on the CNC work tray is clamped down or the material will spin on the bit at approximately 2500 RPM until the bit breaks.
That’s called kickback, and it’s one reason why the table saw is probably the most dangerous tool in your shop. Please be careful!
Don’t use bad PWMs. Also, don’t connect PWMs backwards.
never trust the robot when its on
we lost connection with it and it went after the whole team
robot+lose connection=sprang ankle and no more camera turret 
don’t forget when your working on it to put it on blocks…::ouch::
Neophyte team member sent to deburr a hole in a plate… 30 seconds later, we hear a loud sound and I spend the next 30 minutes extricating said plate from deep within the belt sander…
DO NOT! go up to your team’s CAD computer and decide it would be funny to mess around with the design. While fixable with ‘undo’ or ‘ctrl z’, it is really annoying and not remotely funny. One time a rookie even accidentally caused the computer to freeze up, making me have to re-CAD everything I had been working on
Do: Constantly save your CAD drawings
This happened to us a week ago. If you need to drill holes in a plate, and the holes are right above an encoder, NEVER EVER drill them without removing the plate!!!
That encoder took too long to replace
Do not try to see if the battery fits and accidentily touch the battery terminals to the frame causing sparks and the unfortunate nickname of Sparky.
Also do not forget to put the tailgate up on the truck you are hauling the robot in. You will make a turn and the robot will fall out on the highway.
Do: Insulate your batteries the INSTANT you get them. I thought everybody did that…
We had a 2-cim shooter setup, and wired the positive wires from each motor to one jaguar, and the negative wires to another! Thankfully, the jags survived and seem to have avoided any damage.
We actually did a similar thing, putting power into both sides of a Jaguar, and found that it was unresponsive afterward.
Don’t wire motors directly into the power distribution board and turn the robot on.
Don’t let freshmen drill on your electronics board by hanging it over the table when you aren’t looking, causing a giant crack to form in the Lexan you and your squad spent hours working on making the biggest, best board we ever made… in Week 6.
Why me.
Never ever EVER let the mechanical engineer guys design places for electronics to go and wires to go. They will put it under a giant rotating arm and make it impossible to wire anything there. Always design it yourself or find a place and be firm about it.
i put a wire connected to a bettery, much smoke. then a friend did it to prove what happened, and he got in trouble for it!:yikes:
Never forget to secure the robot crate in the back of a pickup when driving. It will fly out of the truck.
Nothing more bizarre than watching a 400lb crate catch wind and lift up and out of the trucks bed. Also, the truck stops faster than the 400lb crate sliding down the road, it rear ended me.
Robot survived.
My reputation didn’t 