hey got a tech question about AM Trannys

[Holtzman]

For the people who have had issues breaking roll pins in the shifter assembly, are you sure that the shifter was properly adjusted and that the nylon stroke limiting spacer was installed?

I have seen these roll pins break if the nylon spacer is omitted, or if the shifter is adjusted poorly.

You should be able to adjust the Shift Block such that when the cylinder is at full extension, the dog gear is nearly flush against the 48 tooth gear, and when the cylinder is retracted against the nylon spacer, it is again nearly up against the 35 tooth gear. When adjusted properly, the roll pins only see significant load during the shift. If they aren’t adjusted properly, the roll pins are loaded constantly, and this can lead to premature failure.

In the first match of the GTR finals, we broke the 1/16" Roll pin in the shifter block. This was caused by omitting the stroke limiting spacer. After re-installing the spacer, and replacing the roll pins, and properly adjusting the cylinder, we’ve experienced no further issues.

Also, the 3/32" Roll pins through the dog gear can be replaced with these "High Strength" roll pins from McMaster Carr. Part number 95755A131. They seem to be a tighter fit than the pins that come stock with the gearboxes. As for whether they are actually any stronger than the ones that come stock with the gearboxes, our very limited testing says "So far so good".

These shifters are quality engineered and built products. If your breaking roll pins, you’ve probably got something put together wrong.

[Cory]

Originally Posted by Uberbots

we downed the psi to 40 after breaking like 10 pins
25 though? that seems a little low. i wonder if the solenoid will even shift at 25 psi... doesnt it take 30 before it does anything?

In 2006 we shifted at 20 PSI just fine.

[Travis Covington]

Originally Posted by Cory

In 2006 we shifted at 20 PSI just fine.

This was with the SY3000 series SMC valves. The festo may perform differently though?

[Pat Roche]

With the AM's this year just above 10 psi still shifted gear perfectly fine. It started to get hairy anywhere under that.

[Uberbots]

Originally Posted by Travis Covington

This was with the SY3000 series SMC valves. The festo may perform differently though?

Really?

whenever we boot up the robot from a no-air state, it takes a noticeable amount of pressure before any of the solenoids will trip. i believe this is at about 20-30psi, so ??