"Jim Wilkins" wrote in message
...
On Apr 12, 3:23 pm, "Ed Huntress" wrote:
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in
messagenews:Xns9EC59A0326DF7lloydspmindspringcom@2 16.168.3.70...

"newshound" fired this volley in
:

Nope, Tim is right

Besides that, hard on hard of the _same_ hardness often induces galling.

True, when neither journal nor shaft is hard enough to resist it. Galling
is
the primary reason that soft steel on soft steel is such a disaster.

--
Ed Huntress

Considering the OP's low-end fabrication equipment, do you think
hardware store CRS or aluminum rod on nylon would be good enough?
These machines aren't going to be beaten up in arcades any more.

jsw

Likely so, but I want to have a better idea of how that rod moves around.
The advantage of nylon or Teflon would be that replacement bearings would be
easy. If the loads are light, as I suspect, there's no reason to go to hard,
unless slop in the bearing is a big problem.

The way he has it arranged now it looks like the fairly light loads are
concentrated at the contact points, which would be deadly for a plastic
bearing. It needs a bigger bearing surface -- a ball and socket, or
something like that.

But I'm not sure I have the movement figured out correctly.

--
Ed Huntress