Ok, guys thanks. I have no idea what tip I have. Its a generic HF. My O2 gage is a Smith and my Acet gage is a Gentec that a friend gave me after my after my smith A gage decided to take a dump and spill Acet everywhere. Anyway, its frankenstein. My Smith head was t*ts up and cost more to rebuild (according to the local welding shop) than I wanted to spend. Anyway, I finally got out back today to cut some more steel off the giving tree for another project.
(More on the giving tree later)
I followed your advice. Tip drilled all the tip ports. Dressed the face of the cutting tip with a file, and then set the regulators first with pressure and then with flow. Big difference, but I knew that. O2 reads 35 closed for 25 flowing, and the Acet reads 8 closed vs 4 flowing. With gas flowing I set them at 4 and 25 and went to work. I was cutting various sizes of c-channel from 2" and about 1/8 thick to 4" at nearly 3/8 in the corners. At those settings if I took my time I got a pretty darn cut on all of it my lack of skill not with standing. I got less than 1/8" of kerf on all of it including the thickest sections, and when I was cutting properly I got no slag at all on the top side, and very little on the bottom.
I noticed a couple things. First is it gets all slag crazy if you have to cut into an inside corner. Probably because the effective thickness approaches 3/4" at that angle. The other was that if you go a little to fast and loose the cut its harder to restart than it is at an edge for some reason. Maybe because there is more metal to heat up. I found if I used a gas welding technique and made little circles with my cutting head to heat up the metal around the cut it would restart again easier.
Thanks guys. All the tips helped me make hack through the metal a lot easier. I did find it was a lot harder for me to keep the cutting head going straight than I remembered, but then in the past I was creating so much slag I probably just could not tell.
For those who made it this far the giving tree is an old boat trailer a guy gave me. He told me to use it if I could, and if not sell it or whatever. A buddy short on cash needed some wheels because the fancy mags on his boat trailer were cracking. He got the white steel spoke rims that were on it. Another buddy stripped the winch on his trailer. A while back I needed to unload some farm implements, so I cut up the front A frame portion of the trailer and made some slip on forks for my front loader out of part of the4" c-channel main frame. Today I cut out several sections to make a front hitch and slide in mount for a Warn winch to go on my 4x4 truck (or where ever I need it). This junk trailer that a guy I didn't even know gave to me (with the title) just keeps giving and giving... Heck. I still have the hitch, jack, and two good axles along with the fenders and some steel diamond plate, and even some of the frame left.
The guy offered me the trailer for free because he thought I could use it, and he would have to do a lot of work he didn't want to do to make into something he could give to his brother in law for his yard service business. After he had already given me the trailer I learned the other part. I had a small tilt bed trailer I hardly use that has nice stake sides. (I have two other flatbeds for hauling stuff besides) It was perfect for his brother inlaw's yard service business, so when I went to pick up the trailer I took mine with me. Didn't even tell the guy. He was floored. We both got a lot of use out our "trade" and this big boat trailer I got is still finding new uses nearly a year later. His brother inlaw got a great Christmas present. I'm gonna be sad when all that steel is gone though and I have to go buy some for the next project afterwards. Heck today alone I got about $200 in steel off of it if I had to go to the steel yard and buy it for this project.
Bob La Londe