Sun Feb 28, 2010 3:41 pm by Magic1
Before I picked my first Yale clone lock, I watched my hands one day. I am right handed so I had the torsion wrench in my left hand ... and it wasn't moving !. Now everyone tells me that you have to continuously relax and increase tension, which helps clear those pins that are 'almost' in shear. OK I am a newbie so my newbie mind asks the question ...how many times a minute ... or a second ..... am I supposed to do this and is there an optimum rate ?. If there exists an optimum rate how can I measure what it is ?. Some might have a guess at the answer, but who has actually measured the optimum frequency ?. How about once per second ?. Or how about 100 times per second ?. We have too have a starting point, so I will say that 100 times a second would be much better than once per second. Next someone is going to say why do we need to do this anyway ... and the answer is for automatic lock opening, where the time taken to go through every combination of frequency, pressure, pulse width etc., for the tension wrench and again the same for opening process may take longer than 24 hours to get through the complete sequence ... which a micro-processor can handle ... but a human finger cannot.
There used to be a poster about how tight, to tighten a nut. It showed a spanner at a certain angle and by the side of it the word "Tight", about 90 degrees in advance of this was another spanner and beside it the word "Shear". So The joke was "how do you know when a nut is tight ... just take it up to shear and then slacken it off a quarter of a turn !"
The relevant question is when you relax torsion, how much do you do it by ?. The logical answer is until the pins start to drop out of shear ... and then back a little bit !. Now that will sound crazy but .... it is something a micro-processor can do often, to find out the minimum amount of torsion required to keep all captured pins in shear. Sure they drop out but the micro-processor knows exactly where it was at that moment and can return the lock to that condition.
Your thoughts .... ?