Why is it that a plasma cutter will not always cut perpendicular to the surface that I am cutting? Have used a couple of different makes, generally the same results. Did not change a thing! Would like to know how to correct this without a lot of trial and error ( present state of affairs ). Thanks
The quick answer is, "it will", so long as you cut slowly (mostly). Usually, the problem is that molten dross blocks the stream from getting to the metal below (or diffuses it so it won't cut). Angling the cut (top of the cut trailing the bottom) makes the dross fall away from the slot, instead of dripping down its length.
That same technique has merit with OA cutting as you approach the maximum thickness the head can handle.
LLoyd
As they say - follow the money - now it is follow the ground.
The plasma is heading for the ground. One hopes it is the ground return but can be also be the safety ground return from the table or what not.
I've cut across metal and made the corner and up the side - the ground was behind the area - with somewhat equal access to all area that is being cut.
Another point - don't cut off the source of your ground! That limits cuts.
Martin Martin H. Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member
RJ wrote:
It's more difficult to get a cut started with plasma if the torch is held perpendicular to the workpiece because blowback and splatter affect the gases flowing from the torch and adversely affect the cut - and sometimes the torch. For this reason, hand held torches are usually held at a slight angle to start a cut, then moved perpendicular to the workpiece after the cut is established; similarly, machine torches with automatic height controls are usually programmed to start a cut with the torch higher off the workpiece than the distance at which the cut is made.
If you're doing much detailed cutting in thin stuff by hand, you might consider drilling pilot holes in your workpiece, then starting your cuts over those holes - you'll save a bunch in consumables by doing so.
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