and I wasn't going to post this... but since I figure that pretty much no-body reads this I may as well...
I've started to make a guitar from my projects list...
so expect photos, cad draws and such in the sometime near future...
speaking of cad drawings....
www.freecad.com have some free cad programs for those that are interested...
I particularly like Turbocad 4 LE (learning edition), it works pretty much exactly the same as the turbocad that i learned in school.
I tried Autocad 2007 the other day, I find that far too difficult...
strangely though, I do quite like using Pro Engineer for 3d work as I learned how to use that whilst in Uni.
(but neither pro engineer or autocad are free. turbo cadLE (and a load of others I havn't tried), are free.
Thursday, November 30, 2006
The Things I do for a laugh...
It's been a while since I posted anything, and as anyone who actually read this may have guessed...
that's because I havn't made anything...
well that's not strictly true, I havn't made anything worth writing about...
I have started a few projects though.
for instance...
I'm making a tab welder, it's very simple, heres the theory.
welding is a simple process, you take two metals, heat them till they melt, when they have melted the mix, as they cool they harden, attached to each other...
a tab welding welds thins strips of metal together by momentarily melting them with some very high current, they are normally used to join plates to batteries when making a battery pack.
the long and the short of it is that you charge a capacitor, then you discharge it through the surfaces that you want to weld, the capacitor discharges very quickly, and because the resistance of the materials is so low, a large amount of current is draw from the capacitor, large current = large heat, large heat = metal melted and fused...
simple huh?
Anyone who is still confused should google "spot welding",
well... when I say capacitor, I actually mean capacitor bank. I'm using 33,000 uF caps, and plan to have about 200 in my cap bank, simply because I have a regular supply of junk equipment that use these and I can take them out prior to disposal...
it's all about keeping the costs down...
at the moment, (with only 30 caps), I can attach a single strand of copper wire to a slot blanking plate from a computer case...
so I'm hoping that a couple of hundred caps will enable me to weld things from the reasonably thick, to the very thin... altering the amount (time) of current available with the amount I charge the cap bank to.
that's because I havn't made anything...
well that's not strictly true, I havn't made anything worth writing about...
I have started a few projects though.
for instance...
I'm making a tab welder, it's very simple, heres the theory.
welding is a simple process, you take two metals, heat them till they melt, when they have melted the mix, as they cool they harden, attached to each other...
a tab welding welds thins strips of metal together by momentarily melting them with some very high current, they are normally used to join plates to batteries when making a battery pack.
the long and the short of it is that you charge a capacitor, then you discharge it through the surfaces that you want to weld, the capacitor discharges very quickly, and because the resistance of the materials is so low, a large amount of current is draw from the capacitor, large current = large heat, large heat = metal melted and fused...
simple huh?
Anyone who is still confused should google "spot welding",
well... when I say capacitor, I actually mean capacitor bank. I'm using 33,000 uF caps, and plan to have about 200 in my cap bank, simply because I have a regular supply of junk equipment that use these and I can take them out prior to disposal...
it's all about keeping the costs down...
at the moment, (with only 30 caps), I can attach a single strand of copper wire to a slot blanking plate from a computer case...
so I'm hoping that a couple of hundred caps will enable me to weld things from the reasonably thick, to the very thin... altering the amount (time) of current available with the amount I charge the cap bank to.
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