11 Feb
2019
11 Feb
'19
9:16 a.m.
On Mon, 11 Feb 2019, Jack Harper via cctalk wrote:
Hello Chuck -
I like the idea of those sliding rails - and they appear by the link to be
good to 200-pounds.
However, with the HP7970 Drives, I would worry about the moment pressure
exerted on the rack with the unit slid all the way out.
. . .
The 19" rack that I have is actually fairly flimsy and I worried about the
thing flexing with the stop/start (15ms stop) of the two Tape Drives.
Last thing I want is for the tape rack to start wandering about the room with
tape action like some of the early disk drives (I remember reading that the
original "large" UNIVAC Fastrand drum units laying horizontal would turn
circles by gyroscopic action as the Earth rotated :)
A few hundred pounds slid all the way out will topple it.
If the center of gravity is NOT within the perimeter of the base, . . .
Need to bolt the rear to the floor, or something SOLID, and extend the
"footprint" of the front to include where the center of gravity is when
fully extended. And a bit more, so that setting a tool or elbow on it
doesn't topple it.