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Registered Member #3315
Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156
I have been working on the scar 1000 for a couple weeks. I will upload pictures soon.
Progress. body complete coil complete cap bank complete clip: 50% charging circute has arived SCR: ordered
Fired first test shot this evening. charged to only 330 volts with a sucessfull fire. this thing got some power at only 330 volts!! i plan on 450 volts at full power. next shot i was charging and it got to around 330 again and booooooooooom!! sounded like my 30-6 my ears were ringin bad. it looks like one of the capacitors shorted on itsself??? Just a bad cap?? the rest of the bank should be ok cause they are in parrel true? any advice wuold be apreciated. I will upload a pic of the cap aswell
Registered Member #3950
Joined: Wed Jun 15 2011, 12:45AM
Location:
Posts: 51
Sounds like you had a bad cap. If the capacitors were in parallel, I don't see how there could be any damage to the other capacitors, unless the actual explosion damaged adjacent caps.
Registered Member #3315
Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156
Few more pics. found some big thick shrink wrap. i feel much safer now after the cap explosion. Ive test shot it about 20 time and 3 or 4 times somthind else shorted on its self but not nearly as violent as the first time. looks like i lost one more cap... could the second bad cap be responsible for the multiple shorts? or once it goes it goes?
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
Apply more solder to your capacitor connections. I see in your pics that only half of the stranded wire is soldered to the caps. The whole wire will certainly still conduct, but you could get a spark between the strands at those contact points, which might sound like a short or damage the wires. (I've had it happen to me before so that's why i said it) very cool looking gun. are those the chinese caps from ebay that i see all the time? I've almost ordered some before.
Registered Member #3315
Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156
pscg: dont know about the coil jus used all the magnet wire out of a microwave transformer. approx 40-50 ft?. Switching will be acomplished with a 800 volt 110 amp scr.
40: ya, I got the caps off ebay from china, 2 of 10 have failed.. I also got a 500 volt dc lcd volt meter off ebay witch worked for all of 5 secs.. again from china.. If anyone has a similar volt meter they dont need, Iwould love to purchase it . I am a little annoyed having to wait another 3 weeks for one that will hopefull work.. I do need to use more soder,the negative side completly desodered off all 10 caps? I will make sure that never happens again. but I need a new sodering iron, the 10 guage sucks way to much heat out.
?'s Can i discharge the caps while still attached to the charging circute jus makin sure
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S.C.A.R. 1000 (single coil assult rifle 1000j)
