Parallel angle issue

[jounila]

Hello, I have trouble getting decent plasma cut quality on my home built router. The plasma cut is very angled when cutting thick steel and when cutting thinner steel with lower amperage/lower speed.

The CNC router produces very nice circles when equipped with a marker.

On these cuts I am using: 80A, 1.5mm nozzle, 6 bar air. 5mm was cut with speed of 2000mm/min, thicker (16mm) is cut 500mm/min. Pierce height: 3.5mm, cut height 1.5mm

The plasma is a 100AMP Stahlwerk with pilot from ~2010, so a chinese shitbox but I was hoping to make it work.

[adbuch]

I would recommend checking to make sure that your torch is perpendicular to the table. In other words, at 90 degrees - so in a perfect vertical position.
David

[jounila]

I would recommend checking to make sure that your torch is perpendicular to the table. In other words, at 90 degrees - so in a perfect vertical position.
David

It was checked with a square but maybe its not absolute 90 degrees. Is it possible a 0.5-1 degree misalignment can cause a bigger angle on the cut?

[adbuch]

Yes. Also if the cut height is too high or too low this can cause excessive edge bevel. Also if your consumables are badly worn, this can sometimes result in more edge bevel on one side of the part. Also check your o-rings in the torch. A leaky o-ring can can cause the edge bevel to be more pronounced on one side of the part.

David

[jounila]

Yes. Also if the cut height is too high or too low this can cause excessive edge bevel. Also if your consumables are badly worn, this can sometimes result in more edge bevel on one side of the part. Also check your o-rings in the torch. A leaky o-ring can can cause the edge bevel to be more pronounced on one side of the part.

David

CutHeight2.png

Okay, thank you, I will try to align the torch better. If u have time; can insufficient air flow problems cause problems like this?

[adbuch]

Yes. Also if the cut height is too high or too low this can cause excessive edge bevel. Also if your consumables are badly worn, this can sometimes result in more edge bevel on one side of the part. Also check your o-rings in the torch. A leaky o-ring can can cause the edge bevel to be more pronounced on one side of the part.

David

CutHeight2.png

Okay, thank you, I will try to align the torch better. If u have time; can insufficient air flow problems cause problems like this?

Possibly.

[weldguy]

That looks to me like it could be a damaged nozzle/tip. Once the orifice is no longer round the air flow will veer the arc off to one side. Important things are good consumable condition, clean dry air, for holes smaller than 1" reduce cut speed by 50% from what you would cut a straight line at, and cut direction is important also so the bevel edge is in the waste material viewtopic.php?t=30272