2 Mar
2022
2 Mar
'22
8:45 a.m.
On Tuesday (03/01/2022 at 04:36PM -0800), Marc Howard via cctech wrote:
I've got a PDP 11/34 I've never opened up.
It's mounted in a H9642
cabinet. I can't get the bloody thing to extend on the chassis track
slides.
Is there a catch or lock screw on this unit?
Mine (and we may be learning, is not be a proper configuration) does not
have any release or catch to allow the CPU to slide out. I just grab it
and start pulling and it slides out-- although it does not slide easily.
That could be due to old, stiffened lubricant on the slides.
BUT! make sure you pull out the front foot at the bottom of the rack to keep
the whole rack from tipping forward if you do get the CPU to slide out.
The CPU is a heavy beast and the rack WILL tip forward once the CPU is
out far enough.
Chris
--
Chris Elmquist
2 Mar
2 Mar
9:46 a.m.
On Mar 2, 2022, at 11:45 AM, Chris Elmquist via cctalk
<cctalk at classiccmp.org> wrote:
On Tuesday (03/01/2022 at 04:36PM -0800), Marc Howard via cctech wrote:
Might be a non-standard slide, or a defective lock.
I've got a PDP 11/34 I've never opened
up. It's mounted in a H9642
cabinet. I can't get the bloody thing to extend on the chassis track
slides.
Is there a catch or lock screw on this unit?
Mine (and we may be learning, is not be a proper configuration) does not
have any release or catch to allow the CPU to slide out. I just grab it
and start pulling and it slides out-- although it does not slide easily.
That could be due to old, stiffened lubricant on the slides. BUT! make sure you pull out the front foot at the
bottom of the rack to keep
the whole rack from tipping forward if you do get the CPU to slide out.
The CPU is a heavy beast and the rack WILL tip forward once the CPU is
out far enough.
That's why H960 cabinets have optional front stabilizer feet.
paul
9:52 a.m.
On 3/2/22 12:46, Paul Koning via cctalk wrote:
RL's will flip it too. And let's not even go into RA's. :-)
bill
On Mar 2, 2022, at 11:45 AM, Chris Elmquist via
cctalk <cctalk at classiccmp.org> wrote:
On Tuesday (03/01/2022 at 04:36PM -0800), Marc Howard via cctech wrote:
Might be a non-standard slide, or a defective lock.
I've got a PDP 11/34 I've never opened
up. It's mounted in a H9642
cabinet. I can't get the bloody thing to extend on the chassis track
slides.
Is there a catch or lock screw on this unit?
Mine (and we may be learning, is not be a proper configuration) does not
have any release or catch to allow the CPU to slide out. I just grab it
and start pulling and it slides out-- although it does not slide easily.
That could be due to old, stiffened lubricant on the slides. BUT! make sure you pull out the front foot at the
bottom of the rack to keep
the whole rack from tipping forward if you do get the CPU to slide out.
The CPU is a heavy beast and the rack WILL tip forward once the CPU is
out far enough.
That's why H960 cabinets have optional front stabilizer feet.
10:05 a.m.
New subject: Rack Discussion Continued - Slide lubricant
I have several difficult slides in my H960 rack.
What is the best lubricant for the slides?
I was wondering if graphite would work better than oil due to the fact
that it won't pick up dirt and dust.
On 3/2/2022 10:45 AM, Chris Elmquist via cctalk wrote:
On Tuesday (03/01/2022 at 04:36PM -0800), Marc Howard
via cctech wrote:
I've got a PDP 11/34 I've never opened
up. It's mounted in a H9642
cabinet. I can't get the bloody thing to extend on the chassis track
slides.
Is there a catch or lock screw on this unit?
Mine (and we may be learning, is not
be a proper configuration) does not
have any release or catch to allow the CPU to slide out. I just grab it
and start pulling and it slides out-- although it does not slide easily.
That could be due to old, stiffened lubricant on the slides.
BUT! make sure you pull out the front foot at the bottom of the rack to keep
the whole rack from tipping forward if you do get the CPU to slide out.
The CPU is a heavy beast and the rack WILL tip forward once the CPU is
out far enough.
Chris
10:10 a.m.
New subject: Rack Discussion Continued - Slide lubricant
On Wednesday (03/02/2022 at 12:05PM -0600), Mike Katz wrote:
I have several difficult slides in my H960 rack.
What is the best lubricant for the slides?
I was wondering if graphite would work better than oil due to the fact that
it won't pick up dirt and dust.
I have not done this yet on these particular slides but I think I would
clean them well with something that would remove the old lubricant--
maybe isopropyl alcohol or even WD-40 (as a cleaner, not a lubricant)
and then grease them with light, white lithium grease.
I have used such on other equipment slides with success.
Chris
On 3/2/2022 10:45 AM, Chris Elmquist via cctalk
wrote:
> On Tuesday (03/01/2022 at 04:36PM -0800), Marc Howard via cctech wrote:
> > I've got a PDP 11/34 I've never opened up. It's mounted in a
H9642
> > cabinet. I can't get the bloody thing to extend on the chassis track
> > slides.
> >
> > Is there a catch or lock screw on this unit?
> Mine (and we may be learning, is not be a proper configuration) does not
> have any release or catch to allow the CPU to slide out. I just grab it
> and start pulling and it slides out-- although it does not slide easily.
> That could be due to old, stiffened lubricant on the slides.
>
> BUT! make sure you pull out the front foot at the bottom of the rack to keep
> the whole rack from tipping forward if you do get the CPU to slide out.
>
> The CPU is a heavy beast and the rack WILL tip forward once the CPU is
> out far enough.
>
> Chris
--
Chris Elmquist
11:50 a.m.
New subject: Rack Discussion Continued - Slide lubricant
Hitchhiking on Mike's thread, There's a question that I've wondered
about regarding rack slides.
Right now, for a couple of tape drives, I'm using slides rated at 150
lbs., yet they seem pretty flimsy when compared the the old heavy-duty
slides we used to use.
Has anyone tried using the standard heavy duty (e.g. 250 lb,) extension
drawer slides for their rack work? Post-to-post, my rack is 26" deep,
if that helps.
--Chuck
1:35 p.m.
New subject: Rack Discussion Continued - Slide lubricant
then grease them with light, white lithium grease.
Fully agree!
73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos
2:10 p.m.
New subject: Rack Discussion Continued - Slide lubricant
On 3/2/22 13:35, W2HX via cctalk wrote:
If you wanted something a bit cleaner and less prone to separation, I'd
suggest Boeshield T9.
Great stuff, but more expensive than lithium soap in oil.
--Chuck
then grease
them with light, white lithium grease.
Fully agree! 
4 Mar
4 Mar
10:29 a.m.
New subject: Sun stuff in MA, USA
1:06 p.m.
New subject: Rack Discussion Continued - Slide lubricant
I have several difficult slides in my H960 rack.
What is the best lubricant for the slides?
I was wondering if graphite would work better than oil due to the fact
that it won't pick up dirt and dust.
Powdered graphite for lubricating locks?
I wouldn't like to have conductive stuff like that anywhere it might
get sucked in by fans and deposited on PCBs.
Regards,
Peter Coghlan.
1:57 p.m.
New subject: Rack Discussion Continued - Slide lubricant
On Mar 4, 2022, at 4:06 PM, Peter Coghlan via cctalk
<cctalk at classiccmp.org> wrote:
I had the same thought. And from what I've heard, graphite is no longer recommended
for locks either; part of the reason seems to be that it absorbs moisture. Instead there
are spray cans with neat teflon-bearing very light lubricant, they work very nicely.
If I had slides that needed lubrication I might try some anti-seize compound like the
stuff some guns want in the action.
paul
I have several difficult slides in my H960 rack.
What is the best lubricant for the slides?
I was wondering if graphite would work better than oil due to the fact that it won't
pick up dirt and dust.
Powdered graphite for lubricating locks?
I wouldn't like to have conductive stuff like that anywhere it might
get sucked in by fans and deposited on PCBs.
1:59 p.m.
New subject: Rack Discussion Continued - Slide lubricant
Good point.
On 3/4/2022 3:06 PM, Peter Coghlan via cctalk wrote:
I have several difficult slides in my H960 rack.
What is the best lubricant for the slides?
I was wondering if graphite would work better than oil due to the
fact that it won't pick up dirt and dust.
Powdered graphite for lubricating locks?
I wouldn't like to have conductive stuff like that anywhere it might
get sucked in by fans and deposited on PCBs.
Regards,
Peter Coghlan.
1024
days inactive
1026
days old
11 comments
8 participants
participants (8)
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bill.gunshannon＠hotmail.com -
bitwiz＠12bitsbest.com -
cclist＠sydex.com -
cctalk＠beyondthepale.ie -
chrise＠pobox.com -
jfoust＠threedee.com -
paulkoning＠comcast.net -
w2hx＠w2hx.com