[6873] in APO Printshop
Re: Spec for Replacement Shelving for PressShop Invitation Stocks
daemon@ATHENA.MIT.EDU (Leonard H Tower Jr.)
Sat Sep 5 23:09:13 2015
Date: Sat, 5 Sep 2015 23:09:09 -0400 (EDT)
From: "Leonard H Tower Jr." <tower@alum.mit.edu>
To: Charley Hamilton <charley.hamilton@gmail.com>
cc: apo-printshop-manager@mit.edu, apo-printshop <apo-printshop@mit.edu>,
apo-om@mit.edu
In-Reply-To: <CAK6oc+_6ce7_cfXW78oSnR2rB1_Sj7W8X-G0vnj06+_H2mhjag@mail.gmail.com>
Vicki:
If you have gone ahead & obtained this shelving the rest of this email
is academic. If not, more for you as PSM at the end.
----------------------------------------------------------------------
Charley:
Thanks for your input. Again useful & valuable.
How easily do shelves on PTFE move compared to casters?
How hard is it to bevel the edges of PTFE blocks?
What's it half life? Many plastics degrade in a decade or less.
Tool/technique to use?
The floor tile in the APOffice is uneven in spots, and have a square
PTFE block catch on an uneven joint could break the tile, or topple
the moving shelf (if the brothers don't know how to move loaded high
shelves).
Thanx.
----------------------------------------------------------------------
Hi Charley et al:
I have not seen this problem with casters carrying shelves with high
loads on them. E.g. the card stock shelves between the large press &
the lock up table, that were installed over four decades ago. Six 2"
diameter wide (~ 1") casters, and mobile shelves elsewhere.
But I've spent the week talking with others who might know. Things I
found out:
* Flattening does happened with low end casters made with "softer"
materials, or extremely heavy loads (much heavier loads than the
Press Shop has with these shelves).
* Better made casters have load ratings.
* Better made casters can have metal cores with ball bearings.
They are less prone to flattening, because there is less soft
material.
* Caster material that flatten easily:
polyurethane
soft rubber
* Caster material that won't flatten under this load:
hard rubber
some hardened elastomers
some hardened polyurethanes
metal (but it might crack the floor tiles in the APOffice)
I wish McMaster's had the dimensions we needed for these shelves. I
trust them more than the two sources I already suggested to Vicki.
But I trust those two sources much more than IKEA, Target, etc.
(I did check http://www.mcmaster.com/ before I sent my recommendation
off to Vicki.)
----------------------------------------------------------------------
Charley et al:
I don't have time for more research until after Tues 29 Sept.
Can anyone suggest any other high end vendors?
Does anyone want to find well made casters & well made shelves that
can be attached to one another?
Thanx either way.
----------------------------------------------------------------------
Vicki:
I don't have time for more research until after Tues 29 Sept.
Obligations to old friends. Other obligations to family.
It might make sense to get shelving that had a back. Wouldn't have to
go on a wall.
You might dicker with the other actives for a different location in
the front APOffice that can take 36" wide shelving.
As PSM, it's your call on whether you have enough info to make a
decision on what to order.
It's unlikely anyone will print invitations in the next month,
but it would be great to have this paper inventory up off the floor.
yiLFS -len
----------------------------------------------------------------------
Date: Mon, 24 Aug 2015 01:16:17 -0400
From: Charley Hamilton <charley.hamilton@gmail.com>
To: apo-printshop-manager@mit.edu
Cc: apo-printshop <apo-printshop@mit.edu>, apo-om@mit.edu,
len tower jr <tower@alum.mit.edu>
Subject: Re: Spec for Replacement Shelving for PressShop Invitation Stocks
I wanted to add a comment about casters on high-load shelving.
I have had rubber and other non-metal casters deform under load and end up
with a flat spot when they were left in place for extended periods of
time. I recommend regularly relocating the shelves (temporarily) so that
the casters roll and then leave the load on a different side of the rolling
surface to avoid this problem. We tracked this by painting colored stripes
on the side of the caster and leaving a different color up each time. I
found it to be more difficult to move a rack with tweaked casters (the one
I'm thinking of became unstable and tipped) than it was to deal with
unloading a set of shelves. That said, I had a lot more space to work with
when unloading than there was in the back office the last time I was in
town.
I don't have a particularly good alternative to suggest, however. One
option that I have used would be to add a small PTFE block under each of
the feet. I believe we used something like this:
http://www.mcmaster.com/#8735k67/=ymo2bc
roughly 3" square under each foot, but you might be able to get away with
PTFE-filled Delrin or similar like this:
http://www.mcmaster.com/#8578k414/=ymo2wb
We recessed the feet into the tops of the PTFE blocks for safety, so the
sliding was between the floor and the blocks (instead of the feet and the
blocks). We also swept the area scrupulously before placing the blocks,
and then before moving them, to avoid embedding grit in the PTFE (and
scarring the floors).
This does not provide any restraint against translation, the way that
locking casters do, so you would probably need to look at ways to anchor it
in place if you considered this type of solution. We anchored the rack to
the wall using rod-eyes, chain and carabiners, but we were able to put in
wedge anchors (similar to the Hilti KBTZ or the Simpson StrongBolt 2) to
take the load. I'm going to assume the 'Tute is still opposed to random
holes being added to their structures.
If the Institute is more willing to allow anchorage, I would actually
recommend considering anchors to restrain against accidental overturning
for safety, even if you go with the caster idea. Make sure they can take
the load of course (a simple free-body diagram will tell you what it is),
but if you use a load-rated carabiner, some chain, a rod eye and a wedge
anchor, you have a removable restraint system that might prevent some
Brother or Pledge from ending up as a statistic. Just my cheerful thought
for the day. :-)
YiLFS,
Charley
On Sun, Aug 23, 2015 at 8:48 PM, Leonard H. Tower Jr. <tower@alum.mit.edu>
wrote:
> Hi Vicki
>
> The most relevant older emails are attached. I couldn't find a copy of
> the emails I sent Nathan when he was PSM before Molly and then you.
>
> * The invitation panel stock and envelopes weight 500 plus pounds.
>
> The replacement value of the panels and envelopes is somewhere between
> $1,500.00 and $2,000.00,
>
> So substantial shelving is wanted. Perhaps heavier than what SWE
> has.
>
> * The old shelving was 12" deep x 30" wide x 60" high. There were six
> shelves including the one at bottom/floor & one at the top.
>
> If the replacement shelves are going where the old one was (between
> the taller green chalk board and the entrance to the rear APOffice on
> the yellow wall), the shelving can't be wider than 30" to have enough
> clearance for the electrical outlet & the shelf tray. it can't be
> deeper or it be even harder to get by it to the rear APOffice.
>
> the old shelves were very full, so I suggest we get more height, and
> perhaps seven or eight shelves total.
>
> * We have five sizes of these panels & envelopes, and the boxes are
> different in height. so i suggest the distance between shelves
> reflect this with more space at the bottom, decreasing with each shelf
> to narrowest at the top.
>
> I be happy to assemble them, +/or be on hand when it's done.
>
> To me, this would be easiest to do when they are assembled. Measure
> the box heights of all five sizes, and decide what the height of each
> vertical gap should be.
>
> * I advise that these shelves be up on wheels (also known as, casters).
> At least two of them locking wheels (also known as, casters with
> brakes), which would be installed on the front.
>
> The cut card stock (the wooden shelves against the windows between the
> large press and the lockup table have been up on wheels for over four
> decades, and has made giving CAC access to the window or radiator
> behind those shelves much easier. And also safer for the stock than
> unloading all those boxes by hand. Also much quicker to unlock the
> wheels and carefully move the shelves. It's never tipped over, and
> been quite stable.
>
> If the new shelves go where the broken shelves were, it is necessary
> to move them easily whenever access to the power cord(s) and network
> cable behind is needed.
>
> If the new shelves end up against the windows, they need to be move
> when the CAC need to fix the windows or the radiators.
>
> * Funding could come from the Press Fund, unless the Chapter wants to
> fund it from the General Fund (or whatever it's called now.)
>
> * To summarize:
>
> ** 12" wide maximum
>
> ** 30" inches wide maximum
>
> ** one adjustable shelf for each foot of height
>
> ** 72" high (seven shelves) to 84" high (eight shelves) (plus the
> heights of the wheels)
>
> ** 72' or 84" vertical poles in one piece
>
> ** 2 to 4 locking swivel wheels (aka casters with brakes)
> (not sure the SWE shelves have locks.)
>
> ** Can handle a 500 plus lbs of weight
> (I can't estimate the weight of the inventory without going to the
> APOffice, and I'm out of town until after 25 Dec.)
>
> * Here a possibility:
>
> either 72" or 84"
> basic unit with no wheels and only four shelves:
>
> http://www.theshelvingstore.com/SI-12-d-x-30-w-Chrome-Wire-Shelving-Unit-p/sc123054-p.htm
>
> two to four extra shelves:
>
> https://www.theshelvingstore.com/SI-Chrome-Wire-Shelf-12-d-p/sis-12-p.htm
>
> 4" casters are more stable and easier to roll
>
> https://www.theshelvingstore.com/Rubber-Casters-with-brake-Threaded-Set-of-4-p/4si-arc3wb-p.htm
>
> * A second possibility:
>
>
> http://www.shelving.com/SI-18-d-x-30-w-5-Shelf-Wire-Shelving-Unit-p/sc183072-5p.htm
>
> links to extra shelves & casters lower down on the page.
>
> yiLFS -len
>
>
> ======================================================================
> Date: Thu, 4 Dec 2014 23:38:20 -0500
> From: Leonard H Tower Jr. <tower@alum.mit.edu>
> To: Molly R Kosiarek <kosiarek@mit.edu>
> Cc: apo-printshop@mit.edu
> Subject: Spec for Wire Shelving for Press Shop Invitation Stock Inventory
>
> Hi Molly and other Printers who are not PSM
>
> To replace the collasped shelves that have left the APOffice.
> Used to store the Shop's inventory of plain & panel invitations,
> envelopes, and misc paper.
>
> Anyone think of anything I missed?
>
> Any questions?
>
> The brand of shelving SWE has seems sturdy enough.
>
> Specs:
>
> * 12" wide maximum
>
> * around 30" inches wide
>
> * 72" to 84" high (plus the heights of the wheels?)
>
> * Can handle a 1,000 lbs of weight
> (I can't estimate the weight of the inventory without going to the
> APOffice, and I'm out of town until after 25 Dec.)
>
> * one adjustable shelf for each foot of height
>
> * 4 locking swivel wheels (aka casters)
> (not sure the SWE shelves have locks.)
>
> yiLFS -len
> ======================================================================
> Date: Wed, 8 Oct 2014 22:55:02 -0400
> From: Leonard H Tower Jr. <tower@alum.mit.edu>
> To: apo-actives@mit.edu, apo-pledges@mit.edu
> Cc: apo-printshop@mit.edu
> Subject: DEAD - invite card/envelope shelves
>
> Hi brothers,
>
> * I walked in the APOffice this afternoon, and found the metal shelves
> by the yellow wall entry to the rear APOffice ('ween the Grey PAINTS
> cabinet, and the floor to ceiling green chalk board) bent out with much
> of the card and envelopes on the floor.
>
> * If you know how this happened, please let us know, so we learn what
> not to do in the future.
>
> The adjacent couch was away from the wall, with some of the stock
> behind it. This makes me wonder if someone tried to move the
> shelves from the middle? Perhaps to get at the cables behind them?
>
> * PFTGOTO: it's is best to move tall furniture from the bottom, with a one
> or
> more people balancing the top.
>
> * PFTGOTO: if you are aware of a safety issue in the APOffice, send
> email to
> apo-news@mit.edu
>
> * The contents of the shelves are now temporarily in four boxes. They
> are HEAVY and flimsy. PLEASE be careful if you have to move them.
>
> * Molly came by the APOffice, and as Press Shop Manager said we would
> not try to fix the shelves, but would replace them.
>
> * I suggest AX get heavy duty rolling shelves like the three SWE has
> in their corner. But with five or six shelves each.
>
> It also be good to replace the scrapbook shelves with rolling
> shelves, so repair and maintenance of that radiator would be
> easier.
>
> * I plan to take the old shelves apart, and take the pieces home.
>
> yiLFS -len
> Landline: +1-617-623-7739
> ======================================================================
>
