bob.cook wrote:Which leads me to the question of how heavy can or should the wheels be? I can fabricate them out of Delrin or aluminum or brass, and by varying the thickness of the wheel wall we can get something that is quite heavy or something that is quite light.
Rick Brooks wrote:The heavy steel wheels did not improve static "push" because the tires just spun anyway. What surprised me was the drastic loss of acceleration and speed. ExSpurt looked like it had lost half of it's batteries. After a few runs, the motors were getting very hot...that never happened before! The extra power to drive the wheels was really killing performance.
I went back to aluminum wheels and put lead in the chassis.
sap1975 wrote:i personally believe that if everyone tried to respect that just a little bit harder the world would be a better place.
- start with 1" diameter rod
- turn to 0.945" outside diameter
- face it both ends to 1.615" long
- center drill outer end, 0.236" diameter, 1/4" deep
- center drill/bore inner end to 0.551" diameter for 1.575" deep (will need to use long boring arm)
- turn down outer side to 0.708" outside diameter, for length of 0.866"
- bevel outer corner
- bore inner hole out to 0.708" diameter for 0.120" depth
- mount in mill vise horizontally, mill bottom flat (take off 0.0787" material)
- remount in mill vise horizontally, using flat
- mill front flat 0.1575" deep, 0.590" from inner edge
- mill front slot, 0.4724" wide, 0.590" from inner edge
- remount in mill vise vertically, outer side up
- drill motor mount holes, 0.3740" apart, 2mm drill bit, centered on motor hole
- remount in mill vise horizontally, bottom facing up
- drill mount holes #4-40 tap drill (on center line)
- centerline is 0.3150" from front edge
- first hole is 0.1968" from inner edge
- second hole is 0.5905" from inner edge
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