[TheForge] cutting 1/4 copper

[Kevin D]

Grover,

Just looked this up on; http://store.cyberweld.com/milspec625.html  for a
MILLER SPECTRUM 625 PLASMA CUTTER


Quick Specs: Spectrum 625
Rated Cutting Capacity Rated: 1/2 in (13 mm)
Quality: 5/8 in (16 mm)
Sever: 7/8 in (22 mm)
Rated Output 40 A at 140 VDC, 50% duty cycle at 40? C / 104? F
Plasma Gas Flow/Pressure 6 CFM at 75 PSI or 170L/min at 517 kPa
Weight Net: 57 lb (26 kg)
Ship: 60 lb (27 kg)

Kevin

 -----Original Message-----
 From: theforge-bounces at mailman.qth.net
 [mailto:theforge-bounces at mailman.qth.net]On Behalf Of Grover Richardson
 Sent: Wednesday, April 13, 2005 8:20 AM
 To: 'Sponsored by ABANA'
 Subject: RE: [TheForge] cutting 1/4 copper


 Just curious, how much extra Voltage does it take?

 -----Original Message-----
 From: theforge-bounces at mailman.qth.net
 [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Steve Smith
 Sent: Wednesday, April 13, 2005 8:09 AM
 To: Sponsored by ABANA
 Subject: Re: [TheForge] cutting 1/4 copper


 You need to bribe someone who either has a 1/2" plasma cutter (cuts half
 as much on copper) or a big shear.

 Plasma cutters are way more complex than a welder. They also have higher
 open circuit voltages. Making one gets discussed regularly on
 rec.crafts.metalworking if you want to dig up more detail. The consensus
 is always that it is thoroughly impractical and difficult.

 Steve

 Kevin D wrote:

 > Dave,
 >
 > Actually a friend has a plasma cutter that he brought over.  I suppose
 > it was one capable of 20 ga. steel.  It was cute to watch that little
 > arc just sit there and hum...don't know what size plasma it would
 > take.
 >
 > On a similar vein, I was browsing a used machinery website and noticed
 > a plasma cutter that was billed as able to be a stick welder as well.
 > Does anyone have any idea of a conversion for my old Hobart Truarc 250
 > to plasma cut?  Not being familiar with plasma, I'd assume that copper
 > would take more juice than steel?  I'm not particularly inclined to
 > invest in a plasma cutter, but wouldn't mind rigging my compressor and
 > buzz box to effect the deal.
 >
 > Kevin
 >
 >  -----Original Message-----
 >  From: theforge-bounces at mailman.qth.net
 > [mailto:theforge-bounces at mailman.qth.net]On Behalf Of magichammer
 >  Sent: Tuesday, April 12, 2005 11:29 AM
 >  To: Sponsored by ABANA
 >  Subject: Re: [TheForge] cutting 1/4 copper
 >
 >
 >  plasma cutter
 >
 >  dave m
 >
 >  Kevin D wrote:
 >
 >  >How about a redsmithing question to break the lull?
 >  >
 >  >Last year a local scrap yard had some copper for sale, so I  bought
 > a couple  >hundred pounds at $1/lb.  So a buddy of mine would like a
 > chunk out of a  >~4'x5'x 1/4" plate that I'd bought.  We spent an hour
 > and a half chiseling  >down both sides until it was scored and work
 > hardened enough to  lay it on a
 >  >4x4 and jump on it to break it along the chisel line.
 >  >
 >  >We'd tried setting up a fence and cutting it with a sawzall, but
 >  it wouldn't
 >  >cut straight.  The blade flexed too easily, perhaps too much pressure?
 >  >Anyway, anyone got any better ideas on how to cut out pieces?
 >  >
 >  >Kevin Donahoe
 >  >Flying Pig Forge
 >  >Morrow, OH 45152
 >  >flyinpig at go-concepts.com
 >  >
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