Revelation of the Daleks Necrosian Bomb Build

[elkad]

Reference: https://tardisbuilders.com/index.php?topic=7740.msg97830#msg97830


I couldn't find the exact calculator, so I got the closest one with a 5 x 7 button selection. I didn't know the plus, minus, divide, times & equal button was not the same size. Since it had another level I didn't think of it much & believed I had enough buttons.



I tried making a stencil from the calculator shell to make a bigger shell to fit in the prop. It wasn't acquit. I used a scrap peace of plastic & tried cutting it with the Dremel, then a box knife, then a simple hammer & flat head screwdriver as a chisel, winch seem to work the best, BUT, the plastic broke, & I went back to using cardboard.



I meticulously measured out the 7 x 10 mm buttons with a 3mm gap & cut out the cardboard with the precise cutting screwdriver.



Once I put all the buttons in the holes to see if they fit, I find I'm short, BY ONE.



But that didn't stop me, I cut out a scrap flatten 6mm thick PVC pipe & shaved down a rough button for the last hole.



I have an on/off switch. As for the lighted latch buttons, I'm saving up to get a set.

[elkad]

I hate spell check. I gives you, a correct word, but not the one you need. >(
It would be nice if it had a speak & spell to let you here the correct word.

[elkad]

I've decided to do this prop with cardboard till I find info on YouTube, How to cut small square plastic holes. I'm leaning toward using a jigsaw with a makeshift sandpaper attachment blade, adapter, thingy.
I cut the display out of the calculator circuit board & cut down the plastic face plate that go's over it. I put some masking tape to see how the white lines would look. I need to get some white line tape & some color tape for the buttons.

[elkad]

I wanted to make some optional buttons for the number pad but I didn't have enough micro momentary switches. So I'm making some out of anything conductive I can find around the house. This tuna can will work quite nicely. I just need to flatten this peace & sand off the protective coat on both sides. (keeps the food from reacting to the can & rust.)



Now punch out a few tabs to work as a connection element, & solder both sides.



Now let's work on the compression springs. I'm using a screwdriver, about 5.5 thick & put it on a drill.



I'm using a spring from one of my dad's used insulin injector pens, winding it around the screwdriver, & using a rod I recycled from a dead printer.



Now we take the punch hole & glue it to the spring with the soldered contact on the inside of the spring, & glue the button on top.



I haven't gotten around to making the bottom part of this switch, but it involves two separate nails you solider the wires to, & wen you push the button down, it touches those to nails make the circuit contact.

[elkad]

I made a cardboard replica of the project box suggested to use for this project. Comparing the pictures, is a bit to big. So, I tried my measured box witch as just a little thinner. This one was a little to long.




So I'm going to try to add some of the measured parts & figure out how much I need to shorten my temp box. I'm using some leftover electrical parts from my Master's Logopolis Remote, & colored cardboard for a better picture.

[elkad]

I forgot to mention I bought some new button switches & just waiting for them to come in the mail.

https://www.ebay.com/itm/164786867241?var=464266325057

[Volpone]

I always wonder what these props were made of.  The inset, of course, is some kind of calculator, flipped upside down, but the recent pictures clicked something in my brain and I wonder if maybe it was a portable tape recorder:  http://salestores.com/hamiltonelec49.html 

I mean, it could be anything that size and shape--an AC/DC power converter or something-but the form factor and size look about right. 

[Rassilons Rod]

Honestly, I reckon the box was just one of these with some greeblies added...

RS Project Box

[Jade]

Interesting. I had looked at taking this apart for bits but as it still worked I was reluctant especially as there probably wouldn't have been that much inside. But now I'm thinking of a repaint and some greebles and turning it into something.

[elkad]

I like making it out of cardboard first, I don't have the budget to mess up with PVC. Once I get this finished, my diagram will be posted on the references. Still waiting for my button switches. The panel is screwed down to the small blocks of cardboard, which I need to re-do, because I forgot to put in the buttons & other small things to have an actual springy button.
I did have an idea on how to label the buttons I have. Spray paint the buttons & use a label maker with a white letter on a black background.

[elkad]

I made some cardboard heat sinks for the side of the bomb, your opinion, dose that look close or do you think I should shave it down a  Millimeter?



The bomb prop had a screen or film over the buttons, so I used a Ziploc baggy for the plastic film. Also, a smaller heat sink bar under the calculator screen. (I forgot, did I mention I plan to make the keypad functional? Wired to a set of small LED lights on the calculator screen & 4 empty holes under the square button switches."



Now I'm finished with measuring my cardboard version, I'm going to start with the PVC project box enclosure.

[elkad]

[elkad]

I forgot to mention the screws I used for the prop. I don't know the actual screws used, (any info please), but this is working for a second choice.



OK, lest start working on the PVC box, me measuring out were the screw mounts go.



I use a 3/32 on the cardboard box to put in the screws, but I changed that to 7/64 because cardboard is more fixable than PVC, & was a devil tightening, to the point of braking the mount. (I heard it creek & on the verge of snapping).



Measuring the center line to line up parts & accessories.



I messed up & made a to big of a heat sink for the top & made another.



On / Off switch hole.



I just got my switches in & their not the same size as the ones I've bin using for reference. No problem, not that much of an adaptation from a 13mm 6v to 17mm 12v square switch. (Need to re-measure the squares I drew on the box, good thing I didn't drill the holes yet. REMINDER: Must use brain when reading switch specifics.)



Also, I got 2 reds, instead of one red & one white. I did order one of each color, that bit I remember & looked over my order before clikcing buy now. OPTIONS SCREEN OPEN: Get another, this time white, causing me to delve deep in my empty pocket, or try to modify the switch with a white DIY plastic cap.

[elkad]

QUESTION: Dose anyone know where I can get a white 17mm Square Momentary Push Button Switch Self-Lock LED Lamp 5 Pins replacement cap color filter thingy for cheep?

[elkad]

OK, tested out  a 5/8" hole for the buttons on some scrap PVC to make sure it's the right size hole. Measured out where to drill the holes with new measurements & drilled the smaller vent holes below it.


Making the smaller heat sink for the bottom, I'm not going to glue it till I'm finished with the keypad & display.



Wiring the LED buttons. The black wire at the side is the connection from the negative LED at the bottom to the latch switch & negative terminal, then you got the positive line to the positive of the LED. (I didn't know the latch switch & LED were separate. LEARN SOMETHING NEW.)



Now the side heat sinks. Cutting PVC slats. I'm holding the panel down to the box with a couple screws so I can glue this bottom side of the heat sink. Add some small PVC mounts & drill a hole threw the screw hole & continue with the other side of the part holing it down with #6-32 size bolts & nuts. (I was going to use the screw but the screwdriver couldn't fit in the box frame.)