On Sunday, August 30, 2015 at 5:45:14 AM UTC-7, Jim Wilkins wrote:
"whit3rd" wrote in message
...
On Saturday, August 29, 2015 at 4:01:13 PM UTC-7, Jim Wilkins wrote:
wrote in message
...
One thing leads to another. Starting with Arduino , going on to
accelerometers , and finally to balancing.
...Some years ago ... I made a fixture

If you'd used a live center for the cone, and a
wider-than-60-degree
socket, it might last longer.

I did, the point is pressed into a ball bearing and has a sharper
angle than the recess, to let the wheel tilt. The problem is that
steel I can machine with custom HSS bits barely supports the weight

So, what about a spherical bearing instead of a point pivot? With a little
care, and lubrication, it should last indefinitely.