Now that the platform has been mounted to the motor, it is time to move on to the shaft parts. As this isn't strictly related to the main build I'm going quickly here and the documentation isn't incredibly detailed. The stock is 1 1/2" 6061 aluminum - aka bread and butter. I turn down a roughly 1 1/4" stub - nothing ultra precise here - the diameter is sized to fit comfortably inside a larger spring.
Cut off and face the other end.
On the mill, I drill an off-center hole that fits the key on the slotted drive shaft and then drill a centered hole for the shaft itself. I also cross-drill and tap for a 1/4-20 grub-screw that will clamp everything together.
A second transverse tapped hole is added for a socket head cap screw to hold the spring on the shaft and to transfer the torque. What kind of spring? A surplus Aurora piston spring!
The shaft at the top has a matching stub for the spring plus a smaller section at the top that fits the bore of the bearing. The shaft is cross-drilled...
... and power-tapped for a 3/8-16 bolt.
Top of the shaft with the 3/8 bolt and a nut to lock it into place on the shaft.
A closer look with some extra hardware to increase the eccentric weight that is going to shake the whole platform.
Part 1
Cut off and face the other end.
On the mill, I drill an off-center hole that fits the key on the slotted drive shaft and then drill a centered hole for the shaft itself. I also cross-drill and tap for a 1/4-20 grub-screw that will clamp everything together.
A second transverse tapped hole is added for a socket head cap screw to hold the spring on the shaft and to transfer the torque. What kind of spring? A surplus Aurora piston spring!
The shaft at the top has a matching stub for the spring plus a smaller section at the top that fits the bore of the bearing. The shaft is cross-drilled...
... and power-tapped for a 3/8-16 bolt.
Lower shaft installed on the motor (you can just see the square key in its slot at the bottom right corner of the frame) and the spring in place.
Top of the shaft with the 3/8 bolt and a nut to lock it into place on the shaft.
A closer look with some extra hardware to increase the eccentric weight that is going to shake the whole platform.
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