A proper is the best defense against end-of-cut defects.
Use SheetCam to program a "pre-heat" or use specific path rules that avoid sharp 90-degree corners, which act as stress concentrators.
What and CNC control software are you using?
This technique effectively "scoops" the molten metal out of the way rather than blowing it up into the torch, dramatically extending consumable life and ensuring a clean, crack-free start on thick plates. While standard on many modern systems, you can often simulate this in SheetCam's post-processor by adjusting the pierce delay and lead-in motion for a "wiggle pierce" to blow away the slag. sheetcam hot crack
In CNC plasma and laser cutting, this most frequently happens at:
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.
If your plasma cutter supports it (like high-end Hypertherm units), SheetCam can be configured to signal the machine to ramp down the amperage gradually at the end of the line. A proper is the best defense against end-of-cut defects
Avoid cutting with standard compressed air if cracking is a persistent issue. Utilizing an argon/helium mix or nitrogen can shield the melt pool from atmospheric contaminants that weaken the grain boundaries.
Instead of cutting a hole in one go, use a Cool Down pass .
What and type (steel, aluminum, etc.) are you cutting? What plasma cutter model and amperage are you using? This technique effectively "scoops" the molten metal out
The most effective way to eliminate a hot crack is to use the feature in SheetCam. An overcut instructs the torch to continue moving past the starting point of the cut along the waste side or the perimeter line before turning off.
When setting up your operation, ensure your toolpath is configured to cut all internal contours (holes and slots) before tackling the external profile. While SheetCam's thermal distortion mode generally handles this well, you may need to manually adjust if you are working with extremely thin gauge metals or very detailed parts. Sometimes, breaking the operation into separate layers (one for holes, one for the outline) gives you ultimate control over this sequence.
"Hot cracks" and keygen executables are notorious for carrying malware, ransomware, or keyloggers that can compromise the computer you use to run your CNC machine or manage your business.