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TOPIC: Acrylic Bolted Joints and Cemented Windows

Re: Acrylic Bolted Joints and Cemented Windows 7 years 6 months ago #16085

  • Jon Chandler
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Thingiverse.  I started with information I found in How To: Make Cheap LaserCut Custom Boxes for Your DIY Electronics.  I wouldn't quite make the patterns shown in the article work with Visio, so I created my own.  My patterns are slightly different, in that I made the slot width the same as the nut dimension across the flats to better hold the nut.  The result is a rigid joint that's easy to assemble.

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Re: Acrylic Bolted Joints and Cemented Windows 7 years 6 months ago #10235

  • Jon Chandler
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I didn't mention the purpose of the LCD display stand. No plans at the moment - I just wanted to test the window technique. Since I needed an opaque piece and a clear piece to see the effect, I needed two pieces of material.

Since I ultimately want a window for an LCD display, it made since that it fit a display. Because I needed two pieces of material and I'd been wanting to try the bolting technique, it made sense to include a bolted joint.

Combine these pieces and it only makes sense to make something useful!

Re: Acrylic Bolted Joints and Cemented Windows 7 years 6 months ago #10236

  • RangerBob
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Hey Jon,

Nice piece. Having only just started playing around with laser cut acrylic, I'm just a few steps behind. Was looking into the captive nut bolt solutions too.

Just a quick note about the LCD window, does it have to be glued at all? We have an existing product using a similar scheme; using a stepped window (steped to retain the window in) which is simply sandwiched by the LCD frame. It holds great, no rattling at all once the OLED is tightened down. Obviously the downside is the window has to be milled (not laser cut) to get the step.

Re: Acrylic Bolted Joints and Cemented Windows 7 years 6 months ago #10238

  • Jon Chandler
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A window with a rabbit milled around the edge would be a nice solution! I'm surprised that nobody (as far as I know) supplies pre-made windows in standard dimensions. Windows sized for 2x16 and 4x20 LCDs would cover a lot of situations.

A window like that could just be held in by the display pushing against the back as you say or could use a double-backed tape frame to hold it (some commercial enclosures do this) or it could even be glued in using silicon glue for a waterproof solution.

From what I've read, routing and sawing don't create the high residual stresses like laser-cutting does. It's kind of surprising that what seems to be more the more brutal machining methods are better for the material. I learned about the stress issues when I had something laser-cut and there was some residue left on the piece. "That will come right off with some rubbing alcohol" as was told when my parts were handed to me. I wiped the piece with an alcohol-soaked paper towel and the entire cut edge instantly had hundreds of cracks extending a couple mm or more.

Re: Acrylic Bolted Joints and Cemented Windows 7 years 6 months ago #10239

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I just did a little research on "4x20 LCD Bezel" and it turns out that there may be some solutions.

DH MicriSystems looks like the best bet.

If you have ever looked for a bezel for an LCD 4x20 text display you have probably discovered the same thing we did--it does not exist (until now). This bezel is injection molded ABS to which we adhere a clear 20mil polycarbonate lense to protect the LCD face. This part really dresses up your LCD projects by covering the cut edge of a face plate and hiding the metal frame of the LCD itself.

All this for only $3.50. Nice.

Proud Industries also offer some LCD bezels and at least one of their products is in stock at Digikey. Alas, none of their offerings seems to be the size I need.

Re: Acrylic Bolted Joints and Cemented Windows 7 years 6 months ago #10240

  • be80be
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You can buy LCD bezels from Newark and digi-key

Newark are hard to find but here a link to digi-key http://search.digikey.com/scripts/DkSea ... LCD+bezels

And http://www.mouser.com/Search/Refine.asp ... D%2bbezels
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