[TheForge] cutting 1/4 copper

Wed Apr 13 12:32:32 EDT 2005

I have the thermal dynamics version of the same machine. I love it. I
still use a jigsaw most of the time on thin stuff, though, because it
leaves less cleanup.

JRF
--- Kevin D <flyinpig at go-concepts.com> wrote:

> 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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