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Rusted steel and focal .250

Rusted steel and focal .250

Rusted steel and focal .250

(OP)
Hi

How rust affect the cut on mild steel? For the same parameters on others sheets no problems but today try a really rusty one and man I regretted putting that sheet on the table and start (on top of it) a full program (60X120 in).
I understand pretty good the focal on SS but a lot less the mild steel. I cut rarely that kind of materiel. I have a feeling they gona giva some more so...
If I put 2 for a focal ... how do I expect to see the cutting side of the piece? I mean there's a rule of the thumb for SS 2/3 of the thickness. On SS you can see realy good where the focal goes. I try an other piece after and vlang very good. The thing is cut so good and mirror that I can't figure if I put too much focal or not. I saw a 1/4 of fire coming out under the sheet. That's why I was wandering about the focal. First bubble on top.....had to slow down but anyhow the melting steel was bubbeling under the cut. Lucky to success to remove the pieces out. I was shy of the result. I hate grinder......

Well if somebody have the patience to explain a little bit the + focal, it will be very appreciate.

RE: Rusted steel and focal .250

(OP)
Well found why I had so much problem.
Wasn't really the rust on the piece (but I not use materiel like that anymore)
Ihad a little opening in the ceramic, between the ceramic and yhe metal piece on the ceramic witch is use for the sensing.
Icannot control the gas properly so I was tring to adjust by changing my focal.
But anyhow going on internet to find out more on cutting steel.
Now the machine work back like a rocket.
I admit this Ermaksan machine is very good. I would like the 4kw one. Very fast

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