Make a func_physbox tangle on an axis tutorial - Source

First make a brush that is going to rotate on the axis

Now turn it in to a func_physbox by pressing ctrl and t name it something Im going to go whit rotate_door check de flags like you want them to

now wall off the rest of the map so that the door has a point

Now add the phys_motor from the entety tab and place it so that is in front of the axis that you will drag now drag the origin of the phys_motor horizontal that is going to be the axis it self the origin is the small circle in the middle of the func_motor if its not there press the icon left to the rendering button on the upper tab

Now we are done make sure that the door wont get stuck in the floor I made a double ramp under the door if there is a sealing make sure that the door has space to rotate.

You can apply this for a lots of other stuff and you can go messy whit tham like add some brakabels and some exploding barrels or make something realy creative whit it like combine ing them whit trains and other stuff oh and if you make a map and whit something like thiss in it link the this tutorial to it so other people can learn this too because its EASY.