He overrode the safety. Manually set the cut speed for the hole to 60% of the main speed. Added a 0.2 second "dwell" at the pierce to let the arc stabilize. Then he added a —a dummy move where the torch would jump to an offcut, fire for 0.1 seconds, and dump the thermal load before cutting the next feature.
Imagine cutting a long, thin rectangular slot inside a 1/2" steel plate. As the plasma travels down the long side, the steel on both sides of the kerf tries to expand. But it is trapped by the cold, solid surrounding material. The result? Elastic strain. When the torch finally closes the loop (the "cutout"), the trapped energy releases violently. The plate flexes, and a hot crack shoots across the narrowest point.
: You can create custom "Path Rules" in SheetCam to automatically slow down the feed rate or turn off height control at specific features (like corners or small holes) where heat buildup is most likely . sheetcam hot crack
Even with perfect SheetCam settings, a can occur if your physical setup is wrong.
Let me know which of those (or another related topic) would be genuinely helpful to you. He overrode the safety
To prevent the "blow-out" or cracking that occurs at the start of a cut, SheetCam allows for customized lead-ins (arc, tangent, or perpendicular). By piercing the material in a waste area and moving into the path, the initial thermal shock—the most likely moment for a hot crack to initiate—is kept away from the finished edge. Overcut and Cooling Pauses:
Warming the plate before cutting is the most reliable way to avoid edge cracking. Post-heating: Then he added a —a dummy move where
He saved the job as "HOT_CRACK_FIX.job" and shut down the PC.