Sequential Shifter

thingiverse

Parts Needed: Printed: 1x Shift Knob 1x Btm Support 1x Front Mount 1x Back Mount 2x Side Mounts 2x Bearing Adapters Non-Printed: 1x Zero Delay USB encoder 1x 10-24 x 2.5" machine screw 1x 10-24 x 2" machine screw 1x 10-24 x 1.5" machine screw 9x 10-24 nuts 2x 608 skateboard bearings 1x compression spring (I think I used a #28? Raid your hardware store and use what they have) 2x limit switches 4x screws (attach limit switches to the shifter) 4x #10 countersunk head wood screws (for mounting to your wheelstand, use whatever works for your setup) Assembly: Put the 10-24 x 1.5" bolt through the shift knob hole (the one that runs the length of the knob) and tighten a nut on the bottom side. Cut down the compression spring to around 15mm total length and place it on the bolt. Capture a nut in the hex shaped hole of the Btm support and screw the btm support onto the knob assembly until the spring begins to compress. (Note: you may have to cut down the 1.5" machine screw in order to get enough travel, I used a 2" screw that I cut for this. Also, you may get less play in the final assembly if you put a 2nd machine screw in the Btm support hex bore such that it is just on the threads when the spring begins to compress) Once the shift knob assembly is complete, insert both of the bearing adapters into the bore of each bearing used. Place these onto the 10-24 x 3" machine screw and feed the screw through the crosswise hole of the btm support with enough nuts to ensure that the position of the bearings can be captured. Take the combined assembly of the shift knob and bearing rod and use the 10-24 x 2" to attach the shift knob to the side mounts. Use a nut to secure this assembly. Set the final preload of the spring by turning the btm support such that the bearings just contact the side mounts at the bearing rest position in the center. Prepare the front and back mounts by placing a limit switch (w/ lever removed) on each and secure using small screws. Perform a dry fit with the rest of the assembly to ensure that the btm support contacts the limit switches. Once this is verified, glue the front and back mounts to the side mounts to complete the assembly.