Transfer Track Specs:
Track Gauge: 26mm
Number of components: 246
Design Time: 35h
Print Time: 42h
Assembly Time: 7h
Printer: Prusa MK3S+
Nozzle Diameter: 0.3mm
The transfer track was the most mechanically complex assembly of the build with it including onboard locking pins, an actuating drive tire, holding brake, and positioning sensor. All of these functions were accomplished through the use of 7 servo motors, 1 hall sensor, 2 push buttons, and a few feet of wiring.
Improving on the non-functional transfer track from the previous layout, the second iteration slides laterally on rods with linear bearings and is driven with servos advancing timing belt to allow for automated operation.
To accommodate a two phase launch with the train traveling at high speeds over the transfer track, it was imperative that the drive tire move out of the way prior to launch.
This was accomplished by placing a geared tire on a lever attached to a servo motor that rotated out of the way after advancing the train in reverse onto the launch section. The tire then actuated back to its original position following the train's completion of the circuit.
Repetitive, consistent homing of the track was enabled through the use of push button stops that turn off the drive motors once activated.
Additionally, screws with magnetic ends were positioned on all corners of the transfer track supports to guarantee adjustable alignment with the station, maintenance track, launch, and gravity section of the layout.
One hall sensor was located on the center of the track to position the train via its permanent magnet mounted within the third car's spine.
Once the sensor was triggered, the drive tire would stop advancing the train and the holding brake would activate via a cam mechanism raising a post.
To watch the final painted transfer track in action, check out the video back on the main Launching page or head over to 3d_coasters on Instagram and YouTube.