pic: 48 Kicker Winch

[Josh Drake]

We're doing the window motor too. We don't do the 3:1 reduction, just direct drive. We were able to pull about 70 pounds with the motor, and do it quickly. We too had some trial and error on the pneumatics. We finally went with about a 6:1 lever arm to leave any doubt out of it shifting.

[bmusser]

We had to go with a bigger cylinder and also go with a lever design to get mechanical advantage to disengage. There is too much force required to disengage with mounting the cylinder straight in line with the shaft.

[Michael Corsetto]

Originally Posted by bmusser

We had to go with a bigger cylinder and also go with a lever design to get mechanical advantage to disengage. There is too much force required to disengage with mounting the cylinder straight in line with the shaft.

Another viable solution is to reduce the diameter of your pulley. The smaller the pulley the lower the torque on your shaft, and thus a lower force to overcome when disengaging the dog. Our pulley is 1/2" diameter, aka its just the super shifter output shaft.

[bs7280]

Could you give us more information about the dog clutch you used?

[A_Reed]

Standard AndyMark dog into a plate cut (waterjet) to the same geometry as the inside of an andymark shifting gear. One word of warning though, use a much larger cylinder at least 1.5" bore to pull the dog out of the spool. The force provded by a 3/4" bore cylinder is not enough to overcome the friction of the system and dislodge the dog.

[waialua359]

The Ri3D team used a lever arm, which can overcome the 3/4" bore size.