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Posted by on June 19, 2008, 3:54 pm
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Hey guys! Have a (possibly) simple question for you. I've been trying
to make some nice clean cuts on 1/4" but I seem to be having some
problems. not very well versed in the cutting at all.. How I'm doing
it is, setting acet to about 5 psi, and oxygen to 20-25.. I open the
acet until it's pretty large and making a wooshing sound, then turn on
the o2 at the top of the torch (The bottom one is wide open).. At this
point, there are 3 flames.. The orange flame, then the middle one, and
then the 5-6 little small ones around the circumference of the torch..
What I'm doing, is opening the o2 until the middle flame meets the
little ones around the base, and then a tiny bit more so that when I
hit the trigger, the flame doesn't really change (Well, I believe it
gets less visible).. Is this completely wrong? I've heard people say
that you have to adjust the middle flame for the thickness of the
metal I'm cutting, but that would mean closing the oxygen from where
I'm setting it now.. then when I pull the trigger, I assume that
middle flame would get bigger.. It also seems to take longer to heat
the metal if I leave the middle flame there (Although with the way I
have it set now, I have to get the torch about 2mm away from the metal
I'm heating)..
Now it 'works', but it's not a very nice cut, and half the time, the
metal flows right back in to where I just cut and I have to go over it
a few times.. Obviously making more blobs on the metal.
I'm not sure of the tip I'm using. Can't see any markings anywhere,
but i get the feeling it's more in the settings where I'm going wrong.
Any advice is appreciated. THanks!
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Posted by Ernie Leimkuhler on June 20, 2008, 2:29 am
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In article
> Hey guys! Have a (possibly) simple question for you. I've been trying
> to make some nice clean cuts on 1/4" but I seem to be having some
> problems. not very well versed in the cutting at all.. How I'm doing
> it is, setting acet to about 5 psi, and oxygen to 20-25.. I open the
> acet until it's pretty large and making a wooshing sound, then turn on
> the o2 at the top of the torch (The bottom one is wide open).. At this
> point, there are 3 flames.. The orange flame, then the middle one, and
> then the 5-6 little small ones around the circumference of the torch..
> What I'm doing, is opening the o2 until the middle flame meets the
> little ones around the base, and then a tiny bit more so that when I
> hit the trigger, the flame doesn't really change (Well, I believe it
> gets less visible).. Is this completely wrong? I've heard people say
> that you have to adjust the middle flame for the thickness of the
> metal I'm cutting, but that would mean closing the oxygen from where
> I'm setting it now.. then when I pull the trigger, I assume that
> middle flame would get bigger.. It also seems to take longer to heat
> the metal if I leave the middle flame there (Although with the way I
> have it set now, I have to get the torch about 2mm away from the metal
> I'm heating)..
>
> Now it 'works', but it's not a very nice cut, and half the time, the
> metal flows right back in to where I just cut and I have to go over it
> a few times.. Obviously making more blobs on the metal.
>
> I'm not sure of the tip I'm using. Can't see any markings anywhere,
> but i get the feeling it's more in the settings where I'm going wrong.
>
> Any advice is appreciated. THanks!
To set an Oxy-Acetylene torch.
1. Choose the appropriate tip size for your metal (for 1/4" you should
be using a #0 in most brands of torch)
2. Set your gas pressures for the tip size (for 1/4" steel 6-7 on the
acetylene, and 20-25 on the oxygen is fine)
3. Just crack the acetylene and light.
4. Increase the acetylene until the soot just starts to disappear in
the flame.
5. Open the oxygen and increase until the carbon feather just
disappears into the inner cone.
6. To cut clean on thin material like 1/4" you will have to tilt the
head at least 45 degrees, so the flame is pointing in the direction of
travel. This tricks the oxygen blast into thinking the steel is
thicker.
For really thin sheet metal almost lay the torch head flat on it's
side, and move the torch really fast once the cut starts.
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Posted by on June 21, 2008, 5:06 am
Please log in for more thread options On Jun 20, 5:54=A0am, fac...@gmail.com wrote:
> Hey guys! Have a (possibly) simple question for you. I've been trying
> to make some nice clean cuts on 1/4" but I seem to be having some
> problems. not very well versed in the cutting at all.. =A0How I'm doing
> it is, setting acet to about 5 psi, and oxygen to 20-25.. I open the
> acet until it's pretty large and making a wooshing sound, then turn on
> the o2 at the top of the torch (The bottom one is wide open).. At this
> point, there are 3 flames.. The orange flame, then the middle one, and
> then the 5-6 little small ones around the circumference of the torch..
> What I'm doing, is opening the o2 until the middle flame meets the
> little ones around the base, and then a tiny bit more so that when I
> hit the trigger, the flame doesn't really change (Well, I believe it
> gets less visible).. Is this completely wrong? I've heard people say
> that you have to adjust the middle flame for the thickness of the
> metal I'm cutting, but that would mean closing the oxygen from where
> I'm setting it now.. then when I pull the trigger, I assume that
> middle flame would get bigger.. It also seems to take longer to heat
> the metal if I leave the middle flame there (Although with the way I
> have it set now, I have to get the torch about 2mm away from the metal
> I'm heating)..
>
> Now it 'works', but it's not a very nice cut, and half the time, the
> metal flows right back in to where I just cut and I have to go over it
> a few times.. Obviously making more blobs on the metal.
>
> I'm not sure of the tip I'm using. Can't see any markings anywhere,
> but i get the feeling it's more in the settings where I'm going wrong.
>
> Any advice is appreciated. THanks!
Make sure ur acetylene and oxygen pressure is a little over the
minimum on the bottle gauges and thena open the acetylene on your hand
piece until you see the flame seperate at the cutting tip, then turn
it back a touch until it joins the tip again, then turn the oxygen up
slowly until the blue tail is gone and all u can see is the tiny blue
set of flames at the tip, then hit the oxy cutting lever and adjust
the oxygen again so that there is no blue tail and just the little
blue set of flames at the cutting tip, and thats it, dont worry about
the 45 degree angle, just make sure the tip is clean and pointed
directly towards the material you are cutting, your cutting speed is a
big factor in a clean cut, increase your cutting speed slowly until
you hear a noise that comes when the not too hot metal is blasted out
by the oxygen, go too slow and the moulten metal will drip and stick
to your work material, go too fast and u will either get a no cut or a
shower of moulten metal that is blown back at you by the oxygen being
pushed back from the work piece, the tip size isnt as important as
some make it out to be, but u should be close for a clean cut, the
number on the tip normally refers to the thickness of the metal it is
designed for cutting eg- a no 8 tip is for 8mm, a no 12 for 12mm
ect(in oz anyway), the biggest factor for a really good clean cut is
preperation and practice !, have fun :-)).
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Posted by SteveB on June 21, 2008, 8:07 pm
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On Jun 20, 5:54 am, fac...@gmail.com wrote:
> Hey guys! Have a (possibly) simple question for you. I've been trying
> to make some nice clean cuts on 1/4" but I seem to be having some
> problems. not very well versed in the cutting at all.. How I'm doing
> it is, setting acet to about 5 psi, and oxygen to 20-25.. I open the
> acet until it's pretty large and making a wooshing sound, then turn on
> the o2 at the top of the torch (The bottom one is wide open).. At this
> point, there are 3 flames.. The orange flame, then the middle one, and
> then the 5-6 little small ones around the circumference of the torch..
> What I'm doing, is opening the o2 until the middle flame meets the
> little ones around the base, and then a tiny bit more so that when I
> hit the trigger, the flame doesn't really change (Well, I believe it
> gets less visible).. Is this completely wrong? I've heard people say
> that you have to adjust the middle flame for the thickness of the
> metal I'm cutting, but that would mean closing the oxygen from where
> I'm setting it now.. then when I pull the trigger, I assume that
> middle flame would get bigger.. It also seems to take longer to heat
> the metal if I leave the middle flame there (Although with the way I
> have it set now, I have to get the torch about 2mm away from the metal
> I'm heating)..
>
> Now it 'works', but it's not a very nice cut, and half the time, the
> metal flows right back in to where I just cut and I have to go over it
> a few times.. Obviously making more blobs on the metal.
>
> I'm not sure of the tip I'm using. Can't see any markings anywhere,
> but i get the feeling it's more in the settings where I'm going wrong.
>
> Any advice is appreciated. THanks!
I use 4# acet for almost everything, and vary O2 and tip size for thickness.
Turn on the acet and light. Turn up until it quits making floating black
boogers. Come up with the 02. Get the little blue flames. Hit the 02
handle. You got it right when the blue flame tips don't change length when
you hit the handle.
Try to keep a 3/8" or so gap between metal and tip. Go ask for a tip chart
at a welding store. Buy a tip cleaner and clean them out. Buy a couple of
tips if necessary. Four is about all you need, from 00 to 2.
Keep practicing. Different thicknesses require different approaches.
You'll get it.
Steve
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Posted by Leo Lichtman on June 21, 2008, 8:35 pm
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"SteveB" wrote: (clip)Hit the 02
> handle. You got it right when the blue flame tips don't change length
> when you hit the handle. (clip)
^^^^^^^^^^^^^^^^^^^^^
When you "hit the handle," the oxygen flow goes way up, resulting in a drop
in oxygen pressure to the pre-heat flames. In my experience (and the way I
was taught), you then open the oxygen until the preheat flames return to
neutral.
I don't see how you could expect the preheat flames not to change when you
hit the handle.
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> to make some nice clean cuts on 1/4" but I seem to be having some
> problems. not very well versed in the cutting at all.. How I'm doing
> it is, setting acet to about 5 psi, and oxygen to 20-25.. I open the
> acet until it's pretty large and making a wooshing sound, then turn on
> the o2 at the top of the torch (The bottom one is wide open).. At this
> point, there are 3 flames.. The orange flame, then the middle one, and
> then the 5-6 little small ones around the circumference of the torch..
> What I'm doing, is opening the o2 until the middle flame meets the
> little ones around the base, and then a tiny bit more so that when I
> hit the trigger, the flame doesn't really change (Well, I believe it
> gets less visible).. Is this completely wrong? I've heard people say
> that you have to adjust the middle flame for the thickness of the
> metal I'm cutting, but that would mean closing the oxygen from where
> I'm setting it now.. then when I pull the trigger, I assume that
> middle flame would get bigger.. It also seems to take longer to heat
> the metal if I leave the middle flame there (Although with the way I
> have it set now, I have to get the torch about 2mm away from the metal
> I'm heating)..
>
> Now it 'works', but it's not a very nice cut, and half the time, the
> metal flows right back in to where I just cut and I have to go over it
> a few times.. Obviously making more blobs on the metal.
>
> I'm not sure of the tip I'm using. Can't see any markings anywhere,
> but i get the feeling it's more in the settings where I'm going wrong.
>
> Any advice is appreciated. THanks!