Re: Andy Mark Super Shifters
 

What is Hysteresis?

We've been using our supershifters with pneumatics all of last year, and have had no such problems. Care to elaborate?

Re: Andy Mark Super Shifters
 

The locking pin, or whatever it is, that connects the shaft to the rotating thingy with the piston inside it broke; We think it's due to shifting at full power while not having the gears in motion.

After replacing (or something or other) the pin and adding quite a bit of glue (loctite? I wasn't really watching when they were fixing it), and lowering the pressure going to the pistons by means of the regulator, this hasn't happened since.

Note: This happened to BOTH SS's while they were on the robot and we were testing them.

Re: Andy Mark Super Shifters
 

I think some teams had trouble with shifters last year, but it wasn't the pneumatics. It was roll pins that were not quite durable enough, which has since been fixed, IIRC.

Re: Andy Mark Super Shifters
 

Hysteresis is a programming term i don't know the technical definition but it prevents the pistons from shifting very rapidly between high and low when you are right at the speed at which the transmission shifts up and down.

a very simple Hysteresis is to have them shift up at say 5 ft/s but shift down at 3ft/s which prevents the chattering which occurs if u shift up and down at the same speed.

as for the super shifters breaking if you use pneumatics that was a specific problem m in last years supper shifters they changed a roll pin to a screw and the screw could not handle the stress and would fail. we had a roll pin in ours and with the auto shiting we shifted anywhere from 20-50 times a match depending on how much we started and stopped and never broke a super shifter

we where also shifting at 60 psi all season.


edit:http://en.wikipedia.org/wiki/Hysteresis#Control_systems