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On a related note, many teams are using winch systems or a cam actuated radial release mechanism (the choo-choo) but how do you get the launcher to stay down until you want to launch (other than precariously stopping the motor at the exact moment the launcher is fully retracted)?
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We have a bolt coming down from our firing mechanism that triggers a limit switch on its way down. The firing mechanism is programmed to stop at when the limit switch is pressed, and then, when a firing button is pressed, the motors engage again, running continuously until the limit switch is engaged again.