11 Feb
2019
11 Feb
'19
10:48 a.m.
On Feb 11, 2019, at 12:24 PM, Jack Harper via cctalk
<cctalk at classiccmp.org> wrote:
At 10:16 AM 2/11/2019, Fred Cisin via cctalk wrote:
Jack, this looks like a pretty good idea in the short term. But, every piece of concrete I
have ever been associated with has been off-gassing water at a slow rate. I have stored
wood face-down on concrete enough times that I should know better, and it has always been
ruined - rotted - by constant exposure to that water off-gassing. The wood traps the water
(which would normally have no problem evaporating, because it is a very slow rate) which
then rots the wood. Now whenever I store wood flat, I put bricks or something between it
and the concrete so there is an air-gap.
Unless there is a pretty impermeable water barrier between the plywood and the concrete, I
would say that solution is not trustable for more than about 6 months of service at the
outside. Even if there is, I would check pretty often around the bolt holes, because I
think the bolts penetrated the barrier and the wood around the bolts will be rotten soon.
Comments and corrections most welcome from anyone who has more experience, of course; YMMV
and I Am Not a Carpenter?
- Mark
...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.
I bolted the 19" rack with the two HP7970 drives down to a 3/4" thick plywood
base about 36" square or so and then anchored that to the concrete floor - before I
installed the drives.
See http://frobenius.com/190203%20Tape%20Drive5.jpg for yet another exciting photo :)
Best to the List -
Jack in the Rocky Mountains. 