You can cut 300mm with propane!
Im a bit confused as i've had conflicting information on this. I was told that the oxygen should be 2 1/2 times the acet. gas if yout trying to cut half inch mild steel. I was using a cutting torch on a motorised carrige if that helps. Don't know the nozzle size but I was told that it was right. Would love to know a good ratio for this as I played around with the settings and couldn't remember what they were on!! Doh!!!
You can cut 300mm with propane!
I'll have to try that. According the the LPM on the chart, my O2 tank will last about 40 seconds I did try cutting with mine and on my small taorck it sucked the tank dry in no time.
My cheap Chinese torch set came with no instructions.
Been looking at the this thread. I have been using a few PSI on each with good results (propane/oxy.) Bit it is a smaller torch.
Are you using a small cylinder, a full size cylinder should last about 20 mins on this thickness
Depends on what toch/nozzle you are using, if it was an injector type you are probably not a million miles away with that, but as you see from the charts for ANM/PNM nozzles the working pressures are a lot different
I usually cut at 8 psi acetylene/~35 psi oxygen. I do a slow preheat pass (just the preheat flames, no cutting oxy) on anything thicker than 1/4" as it makes for a neater cut especially when bevelling.
http://www.esabna.com/euweb/oxy_handbook/589oxy21_5.htm
I use a track torch ("automated car") often on 3/8" and 1/2" plate. I ensure the preheat flame is set correctly ("pale blue needles" is one way to remember it) and just touching the plate surface. Leave enough scrap so the cut will freeze promptly. OA track torches aren't good at shaving thin strips. There is VERY little speed difference between a clean cut and a nasty one. Adjust speed in small steps.
You'll figure it out with a bit of practice. I use one track torch speed for both thicknesses, and paint-markered a reference dot next to the potentiometer so it's set the same each time.