Low-speed plasma dross
Large, rounded, bubbly deposits on the lower edge often point toward excessive heat input or a cutting speed below the correct chart value.
Free guided CNC plasma diagnosis
CNC Plasma Cut Quality Troubleshooter
Diagnose low-speed and high-speed dross, positive or negative bevel, rough cut faces, poor holes, incomplete cuts, kerf problems, consumable wear, torch-height-control behavior, air-system problems, and machine-motion defects.
Record the visible defect and cutting setup, then follow a ranked corrective-action plan that changes one variable at a time.
This tool provides a ranked troubleshooting starting point—not a guaranteed repair or machine setting. Confirm the correct material, thickness, amperage, consumables, speed, pressure, pierce height, cut height, and delay in the manufacturer documentation. Test changes on controlled coupons and change only one variable at a time.
Common CNC plasma defects
Identify the Visible Cut-Quality Problem
Begin with what the finished edge shows. Similar-looking defects can have different causes, so the wizard also compares speed, pressure, physical torch height, THC behavior, consumables, work connection, and machine motion.
High-speed plasma dross
A small, hard, tightly bonded lower bead can indicate excessive travel speed, insufficient arc energy, excessive torch height, or restricted airflow.
Positive or negative bevel
Bevel may be related to physical cut height, speed, torch squareness, cut direction, consumable condition, or a distorted plasma jet.
Rough cuts and incomplete separation
Check the complete chart process, consumables, flowing air pressure, work-lead connection, torch height, speed, and machine motion before fine-tuning.
CNC Plasma Cut Quality Troubleshooter
Build the Diagnostic Picture
Step 1 of 4
Ranked CNC plasma diagnostic result
Corrective-Action Plan
PLASMA CUT FORGE
CNC Plasma Cut Quality Corrective-Action Plan
Recorded plasma setup
Job Snapshot
Controlled test sequence
Perform These Checks in Order
Ranked possible causes
Most Likely Causes
Shop-floor record
Plasma Test-Coupon Log
Change tested
Result observed
Final retained setting
CNC plasma diagnostic discipline
Why the Troubleshooting Order Matters
Confirm one complete cut-chart process
Match the material, thickness, amperage, torch, consumables, speed, pressure, pierce height, cut height, and delay to one official mechanized chart row.
Inspect the physical system
Consumables, clean dry air, the work lead, torch squareness, plate support, and machine motion must be reliable before fine-tuning process values.
Verify physical torch height
Arc voltage is an indirect height signal. Measure the actual torch-to-plate distance before changing voltage calibration, offsets, or targets.
Change one variable per coupon
Use repeatable test coupons and retain only the adjustment that produces a measurable improvement without creating a new defect.
Plasma cut-quality questions
Common CNC Plasma Troubleshooting Questions
Why does my plasma cutter leave bottom dross?
Bottom dross may be associated with cutting speed, torch height, amperage, airflow, consumables, or a process that does not match the correct chart row. The shape and attachment of the dross help distinguish low-speed from high-speed conditions.
What causes excessive bevel on a plasma cut?
Check physical cut height, cutting speed, torch squareness, nozzle condition, cut direction, machine motion, and whether the defect consistently follows one side or direction.
Why does the plasma torch dive in corners?
When the machine decelerates, arc voltage can change and cause inappropriate THC correction. Review anti-dive, minimum-speed lockout, delay, and THC inhibit behavior for corners, holes, and short moves.
Why do plasma consumables wear out quickly?
Common areas to inspect include moisture or oil in the air, incorrect amperage or consumables, insufficient pierce height, excessive pierce delay, torch collisions, worn electrodes, and unstable airflow.