3 Nov
2006
3 Nov
'06
8:22 a.m.
Hey All,
On 11/3/06, Jay West <jwest at classiccmp.org> wrote:
[RA81s with bad HDAs]
Since I don't know anything about RA81's yet
(have never used them or opened
one up), and because I do intend to keep one or two of the drives running (a
few don't say "bad hda" on them), can someone tell me what parts I should
scavange off the dead ones that are worth keeping as spares? I know the
obvious like the light bulbs and drive select plugs, but what about
components on the inside that "those in the know" would advise I not just
pitch with the drives?
I seem to remember, many moons ago, of a story where a couple of
physisists used the servo assemblies from the head actuators to make a
magnetically susported table. The table was automatically adjusted for
any vibration and to keep it level. I don't remember if they used the
head assembly servos from an RA81 or a different type of DEC drive.
Has anyone else heard of this story and can remember if it was RA81
drives or not?
Thanks.
Simon
--
------------------------------------------------------------------------
"Well, an engineer is not concerned with the truth; that is left to
philosophers and theologians: the prime concern of an engineer is
the utility of the final product."
Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh