We got in our 40" wide 1" rear axle, wheel hubs, sprocket, bearings.
Looking at this much mass that has to start spinning from 0, I will be amazed if we dont have to go with a centrifugal clutch so that the motor can spin up to a thousand rpm before engaging.
Also after measuring the motor hub, turns out the bolts are farther out than the 3/4" shaft, so all we need is a collar like the following to coulpe the intermediate shaft to the motor, and the only modifications to the intermediate shaft would be boring a 10mm hole in the middle so it slides over the motor’s silver shaft.
Would anyone like to 3d print the above collar and see if my measurements line up with the motor hub? I wonder if a really tall 100% density print would work on the actual kart… All of the torque would be going through the contact surface of the 3/16" rectangular key, anyone know what psi abs plastic can withstand without deforming?
$fn = 100;
$boltPatternRadius = 28.575 / 2; // 1.125 inches
$boltRadius = 5 / 2;
$shaftRadius = 19.05 / 2; // .75 inches
$collarRadius = 38.1 / 2; // 1.5 inches
$keyWayWidth = 4.7625; // 3/16 inches
$height = 2;
difference() {
cylinder(r = $collarRadius, h= $height);
// All of the negative space
union() {
// bolt holes
for(angle = [0:90:270]) {
rotate([0,0,angle])
translate([$boltPatternRadius, 0, 0])
cylinder(r = $boltRadius, h=$height);
}
// key way
rotate([0,0,45])
translate([$shaftRadius, 0, $height/2])
cube(size=[$keyWayWidth, $keyWayWidth, $height], center=true);
// 3/4" shaft
cylinder(r = $shaftRadius, h= $height);
}
}