Target Plans shaft

1
Target Plans shaft bearings
We could increase shafts second moment of area
and reduce its mass
Existing shape Ixx 200mm4 CS area 18.04 sqmm
Try a hollow square Ixx 195mm4 Wall thickness
0.3mm Side 10.2mm CS area 11.88 sqmm
X
X
X
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We might get a 35 reduction in Area would have
to be made by Spark erosion its another
development Exercise Torsional stiffness also
better easier to keep straight Bearing design
better DLC coating more uniform
2
Target plans Shaft bearings

• Whatever shape the bearings are, they should be
  heavily relieved

1.5mm wide contact area Pay attention to surface
finish
Radius this edge
5deg chamfer?
Need to make wear tests etc, again could be
done With some mechanical rig Try making the
bearings from material softer than the shaft