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Old 10-13-2005, 13:02   #1 (permalink)
Rich
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OT: Oxy Propane cutting

Hi to one and all, could any of the experienced people out there help me
with a little problem, using Oxygen and Propane, and a proper cutting gun
what sort of pressures should be used, and what thickness of steel would it
be capable of cutting

Rich
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Old 10-13-2005, 13:02   #2 (permalink)
EMB
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Re: OT: Oxy Propane cutting

Rich wrote:
> Hi to one and all, could any of the experienced people out there help me
> with a little problem, using Oxygen and Propane, and a proper cutting gun
> what sort of pressures should be used, and what thickness of steel would it
> be capable of cutting
>


Cutting tip size controls the pressures needed and the thickness that
can be cut. If you give me some idea of what you intend cutting I'll
see if I can give you an accurate answer.


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EMB
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Old 10-13-2005, 13:02   #3 (permalink)
m0bcg
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Re: OT: Oxy Propane cutting

no more than 50psi oxygen and about 4-7psi propane.

make sure you have a single stage 2 gauge oxy regulator that goes to at
least 80psi [ie cutting reg] .

no real need for dual stage reg plus they are more expensive

note that propane or acetylene regulator will not show a great amount
of bottle pressure if using propane , so in other words you might think
bottle is empty when it actually isnt, its just that none of the gauges
available show much bottle pressure with either fuel gas even on a new
bottle .

1/16" PNM nozzle will cut up to 6" thick but i doubt youll go that
thick , realistically youll only need 1/16" nozzles for almost
everything .

if you want to heat materials there are heater nozzles available for
propane use but not for acetylene .

get decent quality nozzles for best performance ie OERLIKON , or use
PARWELD slightly cheaper .

if you are just cutting flat plate and want decent quality edge of
straight lines etc then you may like to look at an EVOLUTION CIRCULAR
SAW at 140 quid , this is like a normal wood type circular saw but can
cut mild steel up to 10mm thick and also can cut aluminium and
stainless steel with different TCT blades.
each blade is 18 quid and will cut 80m length of material before
resharp or new blade is reqd .

it will cut plate at almost same speed as you cut wood with similar
machine .

hope this helps

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Old 10-13-2005, 14:01   #4 (permalink)
Rich
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Re: OT: Oxy Propane cutting

Probably only steel sheet, tube/box some RSJ's so a max of about 10mm thick,
I will find out what the gun is and tip size as well.

Rich

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"EMB" <embtwo@gmail.com> wrote in message
news:dimaop$5ht$1@lust.ihug.co.nz...
> Rich wrote:
> > Hi to one and all, could any of the experienced people out there help me
> > with a little problem, using Oxygen and Propane, and a proper cutting

gun
> > what sort of pressures should be used, and what thickness of steel would

it
> > be capable of cutting
> >

>
> Cutting tip size controls the pressures needed and the thickness that
> can be cut. If you give me some idea of what you intend cutting I'll
> see if I can give you an accurate answer.
>
>
> --
> EMB



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Old 10-13-2005, 14:01   #5 (permalink)
EMB
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Re: OT: Oxy Propane cutting

Rich wrote:
> Probably only steel sheet, tube/box some RSJ's so a max of about 10mm thick,
> I will find out what the gun is and tip size as well.


I've just dug out the specs sheet that arrived with a couple of new
tips. The recommendations are below (pressures in bar)

Tip Size Cut thickness Oxy Press Propane Press

00P 0-6 1.0-2.0 0.35
0P 6-13 1.5-2.5 0.35
1P 13-25 2.0-3.5 0.35
2P 25-75 3.0-4.5 0.35


The only thing to watch out for is that you can get a high enough oxygen
flow through your regulator - many that are designed for welding won't
cope with the flow needed for cutting, although as you're only looking
to cut 10mm it shouldn't be a problem.

It's ages since I've done any gas cutting - my little plasma cutter at
home will cut to 12mm cleanly and for heavier stuff I use the one at
work that's reasonable to about 40mm thick.


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Old 10-13-2005, 15:01   #6 (permalink)
Steve
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Re: OT: Oxy Propane cutting

EMB wrote:

> It's ages since I've done any gas cutting - my little plasma cutter at
> home will cut to 12mm cleanly and for heavier stuff I use the one at
> work that's reasonable to about 40mm thick.


Bloody hell, you use a different definition of "little" to me ! Mine
tops out on 7mm, and its single phase. Your "little" one is three phase ?

Steve
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Old 10-13-2005, 15:02   #7 (permalink)
EMB
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Re: OT: Oxy Propane cutting

Steve wrote:
> EMB wrote:
>
>> It's ages since I've done any gas cutting - my little plasma cutter at
>> home will cut to 12mm cleanly and for heavier stuff I use the one at
>> work that's reasonable to about 40mm thick.

>
>
> Bloody hell, you use a different definition of "little" to me ! Mine
> tops out on 7mm, and its single phase. Your "little" one is three phase ?
>

Single phase, 20A circuit. If I had 3 phase at home I'd be ecstatic but
it'll cost me about 2 months wages to get the cables run so I'll pass on
that.

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Old 10-13-2005, 15:02   #8 (permalink)
Steve
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Re: OT: Oxy Propane cutting

EMB wrote:
> Single phase, 20A circuit.


That's what my tiddler runs on too. 12mm ? What's the difference I wonder.

Not that I have much call for 12mm plate cutting, but you never know.

Steve
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Old 10-13-2005, 15:02   #9 (permalink)
Lee_D
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Re: OT: Oxy Propane cutting

During stardate Thu, 13 Oct 2005 22:29:21 +0100, Steve
<steve@thetaylorfamily.org.uk> uttered the imortal words:

>EMB wrote:
>> Single phase, 20A circuit.

>
>That's what my tiddler runs on too. 12mm ? What's the difference I wonder.
>
>Not that I have much call for 12mm plate cutting, but you never know.
>
>Steve


My 35 Amp feed Plasma tops at 10mm if my memory served me right.
Single phase.

Clarke one.

Lee D
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Old 10-13-2005, 15:02   #10 (permalink)
EMB
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Re: OT: Oxy Propane cutting

Steve wrote:
> EMB wrote:
>
>> Single phase, 20A circuit.

>
>
> That's what my tiddler runs on too. 12mm ? What's the difference I wonder.


I don't know. It's an inverter rather than transformer supplied one.
And it's a no name Chinese made machine that claimed a 12mm clean cut
when I bought it - and I was really surprised to find that it lives up
to that claim.


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