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I made a Giant Lite Brite for Instructables that has over 1,100 self healing holes and hundreds of multi-colored pegs that go inside and light up. It's an improved upon version of the original toy, at super-human size! Create any picture you can imagine in amazing 30 x 37 peg resolution!


 
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Step 1: Gather materials

The Giant Lite Brite is made from:

  • two 40" x 40"panels of clear acrylic 1/8" sheet
  • one 40" x 40" panel of black acrylic 1/8" sheet
  • one 37" x 7" panel of orange acrylic 1/8" sheet
  • many feet (over 100') of colored acrylic rod (fluorescent colors work best)
  • three fluorescent light fixtures and bulbs
  • two 110 volt ac cooling fans (McMaster-Carr 1976K14)
  • several square feet of 1/16" santoprene rubber (McMaster-Carr 86215K22)
  • a good quality rubber cement designed for one-sided application. If you can get your hands on some Devcon Industrial Rubber Adhesive 14900, go fir it, it seems to work a bit better then other types.
  • assorted nuts, bolts, and wood screws
  • one 4' x 8' sheet of 3/4" sanded plywood
  • scrap 1" x 1" for supports

The santoprene rubber was purchased from McMaster-Carr.
All of the acrylic was purchased from Tap Plastics.
The rest of the pieces can be purchased at Home Depot or your local hardware store.

Step 2: Cut your acrylic

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I started the project at the hardest part - figuring out how to create over 1,100 holes in two layers of acrylic. I used a waterjet, but it can be done by hand if need be.

The Giant Lite Brite has three total layers of acrylic inside. The first and second layers have holes cut in them and are spaced 1 inch apart from each other. The third layer of acrylic is just a solid sheet which acts a backer board to stop the pegs from pushed in too far.

The first layer of acrylic is black, and guides the peg into place. The second layer is clear, so that light can pass through it, and is an exact copy of the front layer, just set back a bit so that it can lock the back of the peg into place on each and every hole.

That means you've got to find some way to cut all those uniform holes in two sheets of acrylic so that they line up perfectly. Stack the sheets if you can, and gain access to a CNC router, large bed laser cutter, or waterjet if possible. The holes could be drilled by hand, but be prepared to drill for a while.

I cut the acrylic on the Squid Labs' waterjet. I drew a circle that was just slightly larger then my 1/2" acrylic rod in the waterjet software, set a cut quality of 2 (below normal so it would go faster) and then used the Copy & Nest function of the software to lay out a grid of 37 x 30 circles. While I was at it, I loaded a .dxf version of the Instructables logo into the software to put at the top of the Lite Brite.

Leave the paper on the black sheet acrylic so the shiny top side doesn't get all scratched up with garnet as the waterjet cuts. You can take the protective paper on the other layers though, their surfaces don't matter as much since they are hidden inside the case.

Set the waterjet to start cuts using a low pressure pierce and tell the cut software that it's a brittle material. If you don't the acrylic will blow out and you won't have clean edges or a correctly cut part. Then, set up a movie, do some jumping jacks, or call your mother since the job runs for about 3.5 hours and should be ideally be babysat the whole time.

Step 3: Build a frame

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The sheets need to be held in place somehow. For that, I built a frame out of 3/4" plywood. I ripped a sheet of plywood down into 9" strips. Then, I used the table saw to cut out grooves for the acrylic sheets and backer sheet to rest in. One pass of the table saw cuts a 1/8" groove - perfect for the acrylic sheets. You need three grooves, or "rabbits" as they are called in woodworking, cut into the sides of the case.

The first is a 1/8" groove close to the front of the frame that will hold the face sheet of acrylic in place. The second is a 1/4" wide grove set an inch back from the first grove that will hold the two clear pieces of acrylic sheet sandwiched together. The third and final groove is significantly wider - 3/4" and holds the backer board of the frame in place. Pass the ripped down sheets of plywood through the table saw with the blade height set to about 3/8", half the thickness of the plywood.

The exact distances between the grooves here really don't matter. Just give yourself about half the length of your peg between the front sheet of acrylic and the clear second sheet so that the peg is securely held in place - two inches of peg means a one inch gap between grooves.

Then, give yourself enough room to comfortably fit in your light fixtures and fans between the second sheet of clear acrylic and the backer board. The Lite Brite I built is 9" deep, has the front face sheet of acrylic set back about a half inch from the front, the second and third sheets set back an inch from there, about 7 inches of empty space behind that for the lights and fans.

The back board was cut to be the same size as the acrylic sheets - 40" x 40", from a laminated fiber board. It holds the whole Lite Brite together and has the lights, fans and supports mounted to it in the next step.

Once the backer board has been cut and the plywood has all been cut with the necessary grooves, you can cut the plywood down to length using a miter saw set at 45 degrees so that when you assemble the frame - you don't have any exposed edges. Cut the plywood into panels that will fit around the backboard and the sheets of acrylic while leaving as little wiggle room as possible.

Step 4: Install fans and wire up the lights

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I used three flourescent light fixtures, each containing two bulbs, spaced evenly throughout the Lite Brite in order to light everything up. Mount the fixtures and wire them together onto the end of an old utility plug or heavy gauge extension cord.

The bulbs are in a closed space and as such, tend to get pretty hot when you have them turned on for several hours. The ballast is probably heating up more than the bulbs themselves, but in any case, all that heat could cause problems over long term use.

To help dissipate heat, I drilled five 1.5" holes in the top panel of the case. Inside the case I mounted two 3.75 inch rotary "case" fans from McMaster that run off of the same 110 volt AC plug. Heat buildup was a real problem until I installed the fans. Once they were in, the case ran as cool as a kitten.

Along with the lights and fans inside the case I had to install some wooden supports which hold the back of acrylic stiff and in place. Aside from the supports, the acrylic sheets are only held in place along the edge of the case, so some kind of bracing system was necessary. I used some simple 1"x1" scrap cut to length for supports and screwed them into the acrylic sheets and the backer board with wood screws. Careful pre-drilling those holes in the acrylic - it cracks easily.

Step 5: Laser cut the santoprene and glue it on

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The original Lite Brite wasn't self healing, and as a result, had to be used with those silly paper pattern sheets with the dots on them. I was going to fix all of that by using a sheet of rubber with slits cut in it (2,200 of them) to block the light from coming through the hole when a peg is removed. The "+" shaped slits on the rubber flaps permit a peg to pass through them, help to hold it in place, and then, when the peg is removed, bounce back into place to block the light.

I ordered 6 12"x24" sheets of 1/16" Santoprene (a type of rubber that plays nice with laser cutters) and made up a pattern of slits in Corel Draw that matched spacing of the holes in the acrylic and that could be tiled easily so that I could use multiple sheets of my 2 sq. foot rubber to cover the entire area of the Lite Brite.

Once the file was done, I laser cut each of the 6 sheets with the pattern and glued the sheets behind the front layer of black acrylic using the special cancer causing industrial adhesive - Devcon Rubber Adhesive 14900.

I crudely rolled the adhesive onto the back of the front black acrylic sheet, so as not to get it on the parts of santoprene that would ultimately show through the holes, allowed it to dry until it was tacky, and then put the santoprene into place and applied pressure until it set.

I found that putting a small section of an adhesive roller onto my own applicator - in this case a cardboard tube - was more effective then rolling it on using a conventional paint roller.

Step 6: Assemble the Giant Lite Brite

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Once the glue was dry and the santoprene was held in place I began to assemble the Lite Brite. First, Billy and I painted the plywood black - so it would look a little sleeker, and then we test fit the whole thing together.

Start by fitting the four panels around the back board. The backer board should slide right into the groove which you cut for it using the table saw. If it doesn't widen the groove by passing it through the table saw again, or spray some silicone into the groove to help it slide along.

Then, stack the two clear acrylic sheets on top of each other, putting the one with the holes on top, and slide them together into the middle 1/4" grove that you cut out for them in the plywood.

Before the final front panel could be slid into place I realized that I would need another set of supports to bridge the 1" gap between the two clear acrylic sheets and the black front sheet. 1" bolts weren't the most obvious choice, but they turned out to work really well.

I drilled through the two layers of clear acrylic, slid the bolt through from the back, held it in place with a nut, and repeated the process a few times spaced periodically throughout the entire sheet. The front sheet would rest on the bolts secured to the second set of acrylic sheets, which in turn would rest on the wooden supports that were affixed to the backer boards.

Before we sealed up the last side of the case, I turned everything on and made sure that everything worked properly. After giving it the final check, I slid the last panel into place on the side and used plenty of wood screws at each corner to hold the whole thing together.

The Lite Brite was outfitted with eye hooks so that we could secure it easily to a table or sawhorses when we bring it events like Yuri's Night and The Maker Faire. This step is completely optional of course.

Step 7: Cut and pollish acrylic rods

To make all of the colored pieces that fit inside the holes I purchased twenty 6' acrylic colored rods from Tap Plastics. They carry acrylic rod in all sorts of colors, but be warned, the blue, red, green and purple colors were all too dark to transmit light through them - too much dye I guess, even at the short 2" length that the pegs were cut at.

Yellow, fluorescent green and fluorescent red worked really well at transmitting the light through the rod - so I'd definitely recommend some testing with specific colors of whatever rod you get to see what works for your application.

I did some experimentation using clear rods and spray painting them with translucent paints (Krylon brand and Tamiya clear model spray paint). Some of the tests turned out pretty well, but in the end only the blue painted rods were good enough to use in the final version.

Step 8: Field test the Lite Brite

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Giant Lite Brite v1.0 (not shown in this Instructable) was field tested at Yuri's Night at the Nasa Aims Research Center in California It fared pretty well there where it got steady use, but only for one day, and by only a couple hundred people. By the end of the event some of the foam (only v2.0 used rubber) was coming away from the acrylic front and so some slight modifications were made in order to improve performance for the Maker Faire.

Before the Maker Faire, Mitch and I added on some small nuts, bolts and wide washers to mechanically hold the rubber in place. This was done before the event right outside the exhibit hall in a moment of haste and didn't really do much to help the rubber stay in place since it was so elastic. I can't recommend this as a solid method for holding the rubber in place, but at the time, it was all we could do.

Although the Lite Brite provided hours of fun entertainment for people attending the fair, its rubber backing suffered quite a bit from all the use and came completely off in many spots.

Plans are in the works to waterjet a permanent solution: a steel sheet bolted directly behind the santoprene that holds all the sheets of rubber in place. The sheet will be thin gauge steel that is cut using the same file that the front panel of acrylic was cut with. Except for one change - the steel rubber backing plate will have just a slightly larger hole diameter then the black acrylic to allow for the santoprene tabs to fold back easily when a peg is pushed through.

Updates to this Instructable will follow once the sheet is fabricated.

Step 9: Lite Brite, Lite Brite, turn on the magical colored lights

Bring it places, plug it in, and watch peoples' faces grin ear to ear as they play with a fun toy from their childhoods - only super-sized!

***This project is in no way intended to have anything to do with the Hasboro Corporation's Lite Brite product, licensing, or copyrights, and any resemblance to such product, licensing or copyrights is purely coincidental, subjective and likely false.***
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madhops06207 years ago
GREAT IDEA!! I would definitely do this however its a bit out of my range of ability. Does anyone know where youcan get those floursecent rods though? they could be useful for a number of things. Also, about how much did this project cost overall?

The acrylic rods are actually the most expensive part! We have spent over $2000 on rods. They come in 6ft lengths and we cut them with a miter saw. You can get them at www.eplastics.com

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Fluorescent rods? Oh you mean the acrylic rods Have a look on ebay
haha I feel really stupid I found the answers to both of my questions in the 'able after looking again
hereJust found a Ebay store for acrylic rods
Check it out here
nmuzzatti made it!1 year ago

Here are a couple of things we did differently:

1. Instead of building the unit out of wood, I stumbled upon a 4x8 sign box, like the ones you see above storefronts. Since this box was designed to hold a 4x8 sheet of plexiglass, it made things quite a bit easier. It has 2100 holes (approx) and is backlit by 200+ LED lights.

2. Totally gave up on trying to block the light with the rubber. Biggest pain ever!

Thank you Instructables for the helpful info!

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I built two 3'x4' copies. I do appreciate the instructions and it is a neat project but be mindful about a few things if you try to follow the recipe.

1. The pitch for the holes ("holes spaced an inch apart") does not match the file provided to have the rubber cut (exactly 1.04" spacing in both directions). That sounds minor but the mismatch accumulates across the panel until there is no overlap between holes and plus signs in the rubber.
2. Cost is higher than it sounds initially. The rubber is $8/sq ft plus shipping and water jet cutting rubber cost me $205 (12 sheets stacked and cut at once) and I only got that price after calling around extensively. Laser cutting quotes came in as high as $700 because they had to do it four sheets at a time and some refused the job despite my assurances that this rubber does "play nicely with laser cutters". Each peg costs 50 cents plus shipping (from TAP, 1/2 inch rods in 6' lengths) and that assumes you cut them into pegs and polish and/or torch smooth the ends yourself. The fans specified are $50 each (I went cheaper), the glue, the black acrylic is around $100/sheet, the CNC setup and machining is $70/hour, light fixtures $20-30 each x two or three, 4.5" hole saw plus arbor was $50 where I could find it locally, etc. Get a quote for all material, labor and shipping from every vendor in advance if you might be concerned about cost.
3. The *.cdr file in the article isn't accepted by job shops so I download the free CorelDraw X5 demo and saved As DXF. I would have been better to draw my own array of plus signs, or at least check dimensions twice and cut once to avoid issue #1 above.
4. Tools: Also, you'll need a good table saw for long grooves and bevels. And a miter saw for chopping all the acrylic rods.
5. Peg color selection is limited. In October 2011, I couldn't find half inch extruded acrylic fluorescent rods online in very many fluorescent colors. Yellow does light up as does clear but there is a strong brightness mismatch between fluorescent and not if you try blacklight as lighting instead. Never mind hand-painted blue ones. Some fluorescent blue ones look clear on the side and blue only on the circular tip.
6. The 3/4" plywood back makes it a lot heavier. I switched to a thin back panel.
How about this?
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Wow. . . . O_o
The pegs in this one are translucent Solo cups glued top-to-top and placed in the board. the black areas are Solo cups painted black. it is lit by 8 old florescent lights.
phoe7 years ago
it'd be interesting to see if this could be done with LEDs too, just alternating the +/- rails (just wondering how you could get them to "stick" in place...)
jongscx phoe7 years ago
...MAGNETICS!!! If you could find some way of making insulated traces on a bare sheet of metal, you could energize just those and have the metal plate be the ground... then you won't be limited to a grid... OOH... conductive paint on top of regular paint! *runs off to experiment...*
It's been done before.
Actually, it hasn't been "done before" What you linked is just a modern version of the lite bright. What they did is a larger version of the lite bright. There is a difference. But I do have to say the modern version of the lite bright is pretty cool. I may end up having a go at both of them and put them in my house. :) I'm a lite bright dork.
But this one is WAY cooler! the world wouldn't evolve if we didn't cheat off each other at some point!
Great idea but what about the resistors every colour has a different voltage And people won't notice that the LED's need to have the polarity correct and throw them out.
hmmm... well, resistor-wise you could solder it together so that it kinda wraps around the led. You're right, how would you figure for that? would it be parallel connections? I'm sure there's a voltage range that will overlap for all the LEDs you're planning on using, so that it falls under the maximum of all, but above the minimum... that, or just limit your color palette.
just had a idea that incorporates a SM resistor on the side of a LED and only fits into socket one way I was too lazy to do it better quality
On a day when totally bored and having access to a junk bin and a case full of old phono plugs/jacks and a sheet of that perforated board, I made a patch panel with a LED & resistor mounted in each plug and wired the sockets in parallel. Down side was that you didn't know what colour you had in hand until you plugged it into the panel. Would have looked better if I had painted it flat black as well .... or taken pictures .. oh well. Its the thought that counts right?
Yeah
Jayefuu4 years ago
Regarding step 7, you can buy "light gathering acrylic" that would have done exactly what you wanted in lots of different colours.
Wow! This is So Cool! I saw it the make faire and loved it. I have to say it would be awesome to have a giant 100 ft long 1/8 inch diameter piece of acrylic. Imagine the possibilities.
Imagine turning the lights off in a big room after building a massive picture with the 100ft light brite!
Rimwulf5 years ago
would it have been better to use LEDs? you could get a bag of 100 for a few dollars these days.
The whole idea is that people can remove the pegs and put them back in to make their own picture. As opposed to having to program a giant LED matrix.
not what I meant. use individual LEDs to light up the pegs and make it so they light up when the pegs are inserted that would tone down the heating.
boris_19815 years ago
AWESOME idea!
GREAT instructable!  :D (thats actually the biggest smiley i can do with ASCII).
deaker5 years ago
If you could get the laser to cut each slot at a slight angle there would be no light getting through the cross slot. This may not be a problem anyway. Great Instuctable, great toy.
noahw (author)  deaker5 years ago
The laser beam itself has a kerf.  I'd say that it's only about 1/64", but it's still very much there and lets a very small amount of light through.  Cutting at a slight angle would be pretty cool to see if you could miter the joint and reduce the kerf, but since the laser beam head is fixed on that axis, I don't think that it's in the cards using this method.
Sorry for the muti posting but my internet connection died then it would not show the posting on this page or my account. I tried IE and FF??????
 Chrome!  

A great browser by Google and an even better song by Trace Atkins!


erosser6 years ago
Awesome. You guys win at life. Forever. I agree with your proposal to add a drilled sheet of steel behind the rubber--it would definitely do the trick as far as holding the rubber in place. However, one should perhaps worry about steel getting really hot. Why not make two of the drilled clear acrylic sheets you used, then use one of those instead of steel? Just an idea. Again, thanks for posting this--utterly illuminating! (No pun intended. Okay, maybe, but a bad one, I concede.) Cheers...
motleyjust7 years ago
Wow! What a great idea for Halloween, Christmas, etc. decorations! Thanks!
Awesome! I've been working on something like this for a while only smaller but with real lite-brite pegs(hence the "for a while"). My plan was to just use black posterboard but it would be one use. I really want to make a sophisticated picture like the Mona Lisa. My big hang up has been creating a computer program to convert a picture to lite-brite peg colors and spacing. My initial idea was to filter the picture in Photoshop to the peg colors then put it in a program like rasterbator to figure out where the pegs go. I don't know how to use photoshop though so I've had trouble getting help with that. You may be able to do it all in photoshop with some kind of dot filter too. Anyone up for a "make your own lite-brite pattern in Photoshop instructable?
darkmuskrat7 years ago
you got my vote ;D
pyromonkey7 years ago
that is so phreaken awesome!!! :D :D
I love this I'ble so much! Truly cool idea.
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Doveman7 years ago
So awsome! Noahw, about how much did this cost to make?
noahw (author)  Doveman7 years ago
The major cost was the acrylic sheet and rod. I tried to salvage as much of the wood as possible from scrap, and relatively speaking, the lights and fans are inexpensive, but there's no getting around the price of all that acrylic. I don't have an exact number of what we spent on it, but it's on the order of several hundreds of dollars.
Doveman noahw7 years ago
Wow... more than I thought! =/

Thanks for telling me, one day (if I save up a few $100), I might build this. Its awsome!
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