[djhammerd]

Thanks for the advice and information thus far provided.

I have done further research online and found that setting pre-heat oxygen pressure is not associated with the equipment I have. My equipment has only two hoses (one for oxygen, one for acetelyene), with a single regulator for each hose. Evidently, some setups have a second oxygen regulator and a second oxygen hose.

I found a Victor "Welding, Cutting and Heating Guide" that states "Pre-heat Oxygen PSIG" is applicable for 3-hose machine cutting torches only. With a 2-hose cutting torch, preheat pressure is set by the cutting oxygen"

I was confused by tip and pressure charts that have columns for pre-heat pressures, but did not qualify their use and requirements.

Update.... A little more qualification...

When it states that the pre-heat pressure is set by the cutting oxygen, it means that the user sets a single oxygen pressure, that being the oxygen-cutting pressure.

The follow-on process to create a proper pre-heat "cone" evidently limits the oxygen flow for the pre-heat oxy/acet mix.... and thus provides for a proper oxygen volume (SCFH), as opposed to contolling the amount of oxygen used by the pre-heat by pressure.

Anyway..... If I understand it correctly, that's how it must work.