Nowthat we all have the gist of what is going on here with this hinge business letme make it crystal clear:
I think everybody agrees that for the horizontal plane ofmotion, the hinge pin is positioned vertically (perpendicular) to thehorizontal plane. That is Martee's first picture.
Are we okay on that? Good.
Now, let's all imagine that, in Martee's first picture(horizontal hinge motion) we have permanently imbedded the pin inthe book's cover (sorry Homer!).
Okay, clear so far? A permanently imbedded pinpositioned vertical (perpendicular) to the horizontal surface ofthe book. Now, get ready for...
Yoda's Blue Darter Curve Ball. Now, Ididn't say the book was immoveable, just the pin!
So, let's stand the book up on its bottom edge --remember, the hinge pin is permanently imbedded -- and what have yougot?
Answer: A pin that is now vertical to a vertical plane,that's what! And you didn't mess with the pin. You just changed theplane of motion from horizontal to vertical.
Now, let's again take the book -- and its permanentlyimbedded pin -- and tilt it at an angle. And what have you got?Right! A hinge pin vertical to an angled plane!
Again, the hinge pin is always vertical to one ofthree basic planes -- horizontal, vertical, or angled. Because that istrue, the blade of the hinge will likewise be perpendicular to the planeof motion.
Guys, exciting things are coming at you in the next fewdays. Stay tuned! You have fourteen Clubfaces in your Golf Bag that are aboutto learn who's Boss!
Threaded Mode
