## PSN-L Email List Message

Subject: Glass?
From: tchannel1@............
Date: Mon, 12 Nov 2007 08:47:17 -0700

```Hi Folks,   Just wondering about materials for roller on roller or balls =
on plates.   I know the limitations of glass, but a question about its =
smoothness, is the surface of glass as smooth or smoother than these =
hardened and polished steels?

My second question is one of friction:   If you have one ball on one =
plate you would have one point of friction.   If you have one ball =
resting between two rollers, ( in the V) you would have two points of =
friction, but the load would be divided, because its resting on two =
points, so is the end result of friction loss the same???? =20

Thanks, Ted

Hi Folks,   Just wondering =
materials for roller on roller or balls on plates.   I know =
the=20
limitations of glass, but a question about its smoothness, is the =
surface of=20
glass as smooth or smoother than these hardened and polished=20
steels?

My second question is one of =
friction:  =20
If you have one ball on one plate you would have one point of=20
friction.   If you have one ball resting between two =

rollers, ( in the V) you would have two points of friction, but the load =
would=20
be divided, because its resting on two points, so is the end result =
of=20
friction loss the same????

Thanks, Ted

```