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Prevention is the best medicine. Follow these best practices to minimize the likelihood of hot crack errors:
Implement Path Rules in SheetCam to slow the torch down or shut the air/plasma off a fraction of a second early (the "End of Cut" rule).
If the internal tensile stresses generated by thermal contraction exceed the strength of the newly solidified metal, the material tears along the grain boundaries. Why Do Hot Cracks Form? sheetcam hot crack
SheetCAM's primary function is to take a 2D design (typically imported from CAD programs as DXF, SVG, or DWG files) and convert it into a "toolpath." This toolpath is then turned into G-code, the machine-readable language that instructs a CNC machine exactly where to move and cut. It has built a reputation as one of the easiest and most motion-efficient solutions for generating G-code, particularly for plasma cutting.
Ensure your lead-in is long enough to keep the initial pierce puddle away from the final part edge. For thick materials, a lead-in of 6mm to 10mm (0.25" to 0.4") is recommended. Prevention is the best medicine
Program a lead-out path (arc or straight line) that directs the torch away from the finished edge and into the scrap material before extinguishing the arc. This moves the hot crack crater into the waste skeleton, leaving your part edge flawless. 2. Overcut Distance
To minimize the occurrence of hot cracks in Sheetcam: Why Do Hot Cracks Form
They develop at elevated temperatures, often just as the metal transitions from liquid to solid. How SheetCam Helps Prevent Hot Cracks
A "SheetCam hot crack" is rarely a fault of the software itself, but rather a symptom of improper thermal management in your CNC programming. By moving pierces away from the finish line with arc lead-ins, utilizing path rules to prevent corner overheating, and strictly regulating your pierce delays, you can achieve clean, structurally sound, crack-free edges on every project.
In CNC plasma and laser cutting, this most frequently happens at: