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Perfect fit for display rear enclosure: Hammond 1591XXE

Posted: Fri Oct 30, 2015 6:46 pm
by rkinch
I was astonished to just discover: the Hammond 1591XXE electronics box is a lucky near-perfect fit (!) to enclose the rear of the Raspberry Pi 7-inch touchscreen display:

http://www.hammondmfg.com/pdf/1591XXE.pdf
http://www.amazon.com/Enclosures-Boxes- ... B00HKIXNGI

I found that by simply nibbling off the center screw receptacle posts with diagonal cutters, everything clears inside, and there's ample room for all the boards and many optional attachments. The rectangular size of the glass lens (bezel) on the Display is a near exact fit to the box outer dimensions.

Fastening it together as a rigid assembly is a challenge, because the Display design (raw parts repurposed from tablet assemblies) doesn't provide much convenience in that regard. You could improvise with strips of electrical tape, rubber bands, Velcro, etc., to fasten the glass to the box lip on the outside edges, but that's untidy. You could drill the back of the box to fit the Display's rear hole pattern, and attach with standoffs and screws, although the standoffs would have to leave the box spaced away from the glass, as more of an open cover, to avoid putting bending force on the glass, and to avoid putting traction on the glass-to-LCD adhesive.

With the box as a rigid assembly to the Display, you could drill a VESA 75x75 or 100x100 hole pattern in the back of the box to make available all those wonderful VESA stands and gadgets.

What I wish for is a Hammond type box supplied with a special pre-cutout lid with grooves that captured the edge of the glass, like the bezel that every tablet employs, and used that principle to make a firm attachment to the display, with the box part readily removable. This would protect the vulnerable glass edges, assemble everything robustly, and allow for quick opening.

Re: Perfect fit for display rear enclosure: Hammond 1591XXE

Posted: Mon Nov 02, 2015 3:19 pm
by Griffog
Ah nice find, just found it on eBay UK for £11.49 inc delivery.

Hammond 1591XX ABS Enclosure

Re: Perfect fit for display rear enclosure: Hammond 1591XXE

Posted: Sat Nov 07, 2015 9:47 am
by Griffog
Box arrived yesterday, quick Dremel to make an opening for the display and for the power lead and it's all done. 3DPrinted some feet to keep it at the right angle.

Image Image

Re: Perfect fit for display rear enclosure: Hammond 1591XXE

Posted: Sat Nov 07, 2015 4:44 pm
by rkinch
Well done! You attached the box on reversed (backward mounting) from what I had imagined, but that works even better in several respects, if you have the ability to make random shaped cuts in the plastic box bottom, instead of just Velcro or drilling holes for forward mounting. Your method also preserves the removable lid feature. I imagined just omitting the lid and forward-mounting the box bottom as a rear cover, with the open side of the box almost up to the back of the glass, attached internally by standoffs or brackets to the display.

The draft tapering of the box shape means the box bottom is slightly smaller than the display glass, so that's not so lucky a perfect fit in reverse. The glass edges overhang slightly and are left exposed. But that could be tidied up with some tape or other improvised cleverness.

Re: Perfect fit for display rear enclosure: Hammond 1591XXE

Posted: Sat Nov 07, 2015 5:17 pm
by Griffog
Indeed, just seemed simpler to retain the removable lid on the rear for access. I used Pimoroni's LCD frame as a template to cut the opening. Sadly the display does overhang by a millimetre on one side but it's barely noticeable. Even though the case does taper slightly towards the back (now the front in this implementation) it didn't bother me as it needed to be angled anyway and so would need feet regardless.

This way I can unscrew the back for easy access and will now look at presenting one or more of the USB ports on the rear via a short extension in the same way as I have the power plug.

Next on the list though is a hardware button to startup/shutdown via script and potentially an internal battery so I can run it off mains when needed.

Re: Perfect fit for display rear enclosure: Hammond 1591XXE

Posted: Thu Dec 03, 2015 11:39 am
by g3rg
Hi Griffog, how is the screen attached to the case? Are you able to take any internal photos? I have a very similar case I used for another project that seems the right size, but as my project is supposed to be portable, I'd like to see how it all hangs together. Thanks!

Re: Perfect fit for display rear enclosure: Hammond 1591XXE

Posted: Thu Dec 03, 2015 12:19 pm
by Griffog
It's held in by friction at the moment, cut the hole just enough for the display to sit tightly in the frame but you could use double sided tape around the perimeter of the glass to secure it.