/diy/ - Do It Yourself

id use it to make one heck of a electric fence :D

found a number station today. 3530 khz, lsb modulation.

shiiiit wrong thread sorry all

Built this beauty. 2.6 MHz 90 watt feedback oscillator SSTC/ AM transmitter.

Gauss cannons are fun. Should work, but you need a feedback system to know when the projectile is out of the barrol. Make sure to wind the windings in many layers, and in ONE DIRECTION!

the resistors are for the power supply probably. If im not mistaken it is a circuit used to produce a HV arc for starting the circuit. First, check the voltages on the input and check the connections. If those are fine, check the caps. Try checking the transistor(s), the transformer and finally the IC. If all fails, fuck it. You can make one yourself for a few bucks with a 555 timer and a mosfet, or buy a 5 dollar halogen lightbulb psu (ac version), and wire it to the transformer.

>>634291
Orrrr you could melt it and cast glorious putin statue
> chicks dig guys in uniform

I would love to get my hands on that metal

>>631094
No damage at all for aluminium temperatures however when melting bronze it would get a bit powdery at the base where it was the hottest. I've left in the rain for months at times and it still worked fine. I was surprised it didnt explode aswell....

>>630591
Mould seems dry, going to leave it in the oven tonight aswell just in case. Expecting heavy rain tomorrow so I might have the day off work or only half a day, if that's the case ill be firing up the furnace. Just waiting to see if my boss put Saturdays pay through on the weekend or if hes going to bundle it with this weeks pay. If I get paid tonight I can visit the scrap metal dealer tomorrow otherwise might be Saturday or monday depends if they're open weekends

>>628845
This usually takes hours but you can see and feel the difference once its ready. Or in other words I have no idea how long it really takes but my guesses have worked out quite well before

>>628069
Sorry its been a while between posts, fairly busy at the moment.
So now the plaster mold has hardened we have to drive all moisture out of it aswell. My first aluminium casts had imprints of pockets of steam because the mould wasnt dried properly.
So next, preheat the oven to 110 C, line a baking tray with foil ( to catch the wax) and place the mould upside down making sure there is space underneath so the bottom can dry aswell

>>627987
heres the recipe for you

>>628064
After a bit of chiselling were done. Ill burn the cardboard tubes out later on when I fire it up. Tried moving it a bit before and its bloody heavy, might put the next one on wheels...

Anyway ill see if I have time to make the lid and sort out the fans after dinner

>>628063
Ofcourse you could avoid this problem if you spent more than a minute making it ie packing inside with dirt or sand. But its not a hard problem to fix

>>628061
Well the inner chamber bulged quite a bit so thats it for Mr.Bowl

>>628059
Now to unwrap what the easter bunny left for us

>>628057
Well leave this overnight
I actuall lost one of the match stick ventswhile pouring. Should've plastered that part aswell

>>628055
Half way there. Make sure it doesnt touch the bottom or else your going to pour right through

>>628053
Make sure the walls arent too thin or it might crack. Remember liquid metal is still very heavy and the mould might crack once it heats up (you dont want liquid metal flowing to your feet which is why I recommend casting with the mould in a baking tray)

>>628050
That first coating nice and dry (kind of like the texture, might make a plaster statue sometime...)

>>628016
I actually put off making my first furnace for months. After checking metal casting forums for ages I finally said "fuck it lets just make it out of concrete". Only took 30 minutes and it turned out alright. I'd love to start blacksmithing once I have my own place (currently renting) and canafford the proper equipment.

>>627987
For steel and iron casting you should look into getting a proper crucibal (50-60 depending on size last time I checked) and also for that matter make a proper furnace. Once I jump on the computer ill post a picture I saved on a recipe for refractory that could handle iron and I think glass aswell

Large dump incoming

>>627986
Nah, labour for bricklayers. Me and 2 brickies just finished loading 7 1/2 thousand bricks on to second story scaffold, still better than being a roof tiler. My other job during weekends is cooking for a small cafe.
Anyway, gonna drop by the hardware store on the way home so I can finish thelid.

On break at work atm.
http://youtu.be/wdTM5rSSJjk
This video is where I got most of my process from. Although my methods arent as advanced as his....

>>627628
Well im going to make some dinner until that first layer dries up. Will finish pouring after.

Might fire up the furnace tomorrow, will see if I can sort out air supply by then. Make sure to always fire your furnace with wood for a few hours the first time otherwise it might explode.