User:Sciencesucks

so your trying to figure out how to create a safety hinge using hydrolics or pneumatics...i can help you with that!!!

here are 5 steps to make a trap door that closes using pneumatics!!!

1)first get 2 pieces of wood ( one should be much bigger than the other)place the smaller piece of wood on the larger piece and draw an outline of the smaller one on the larger. then cut out the drawn piece.

2)attatch the smaller piece onto one of the sides of the hole that you just cut out and screw in some hinges so that you have created a typical trap door.

3)get 2 metal tubes ( one must be slightly smaller than the other so that it is tight when you try to put it inside the larger one) attatch the smaller one to the top of the piece of wood( the piece of wood that is used as the actual trap door) then you must trace the slightly bigger metal tube so then cut out the hole and slide the tube into the hole.

4) then you must find a spring that is not too strong but not too weak either and put it into the larger metal tube( make sure that the 2 tubes are perfectly lined up so that if u shut the trap door the smaller one will slide inside of the other.( before going further make sure that when you shut the trap door it closes slowly in about 5-8 seconds.also make sure that the trap door shuts all the way.

5) now the last thing you must do is make sure that when you open the trap door it stayes up in the letter of a capital L and also make sure that when you shut the trap door that is closes slowly and without anything getting in the way.

i hope that these 5 steps helped you !!