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Fawteen

12-13-2007 13:39:02

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Read through the reposts of T Bone and MarkKW (and others) advice on setting up a cutting torch, and took another shot at cutting up that raggety old bucket.

Was working with a 1-1/2 tip that was pretty cruddy. Cleaned it, dropped my Acetylene pressure to about 3 pounds and that helped quite a bit, but still leaving a ragged cut with a lot of slag. Some of that is due to working on old, rusted, flaking metal with a lot of goober welds on it.

Tonight, after thinking about it some more, I dug out an old 1/2 tip (the smallest I have) and gave it a thorough going-over with a tip cleaner and tried it again.

PRESTO! Much nicer cuts, able to travel faster, much less preheat, just nicer all around. Most of the bucket was 1/4" sheet, with the mounts being 1/2" and doubled to 1" at stress points. The 1/2 tip cut it like butter, other than the reinforced spots.

Learn something every day if ya ain't careful...

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T_Bone

12-13-2007 20:43:13

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Re: Thanks! in reply to Fawteen, 12-13-2007 13:39:02

Your Welcome Fawteen!!!

Always glad to see that someone finds my info useful.
The center cutting orifice is very critical to the cleaness of the cut as well the speed of cutting.
The preheat (outside orifices) are less critical for cleaness but are more responsive to the speed of cutting.

The minimum kerf size achived (cutting width) is determined by orfice size thus a smaller tip will cut a smaller kerf than a larger tip size. A #3 cutting tip will cut 22ga to 1-1/2" steel with a comfortable orifice size for cleaning. Smaller than a #3 tip then the orifices become extrememly hard to clean due too the small orifice size.

As too cutting straight lines, I have never found anything better than taking a scratch awl to layout my cut lines then use a 2x maginfier lens to see the cutline. Just like in fine detail painting, the magnifier lens focus's the mind into concentrating on a near perfect straight line, so when you look at the finished cut with a naked eye the cut looks extremely straight.

T_Bone

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135 Fan

12-13-2007 16:47:44

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Re: Thanks! in reply to Fawteen, 12-13-2007 13:39:02

That's why it's good to have some different size tips. It can make a nicer job. Wire brushing the steel on both sides would help as well. On thicker steel it's good practice to preheat it before cutting so you don't lose the cut. When cutting heavy pipe with a pipe bevelling machine, it is common to run the torch the torch around the pipe once without cuttting to preheat the pipe. Glad you got it figured out. Sometimes it only takes a slightly different set up to make a world of difference. Dave

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