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Use the exact feed rate recommended by your plasma or laser manufacturer for your specific material thickness.
operation to mark hole centers without overheating the surrounding metal.
Sometimes a "crack" is actually just the torch piercing too close to the cut line or the kerf being set incorrectly. If the kerf width is too wide, the torch may sit on the edge of the material too long during the lead-in, creating a hot spot before the cut even begins.
Create a custom in SheetCam to handle the end of the cut. For example, you can create a rule that triggers "Output Air/Gas Only" or reduces current right before the end of the toolpath. Alternatively, use a rule that accelerates the torch slightly as it approaches the lead-out to thin out the heat input. Material-Specific Considerations sheetcam hot crack
to configure "Path Rules" and tool settings that mitigate the thermal stresses leading to cracks and poor edge quality: Reduce Cutting Speed:
In the world of CNC cutting, a "hot crack" isn't usually a software bug—it’s a thermal issue caused by poor path planning. Fortunately, SheetCam has the tools to fix it.
If you are cutting thick plate (e.g., 12mm+), the "hot crack" is more pronounced. In SheetCam: Use the exact feed rate recommended by your
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
The official software is packed with features that make it a professional tool for serious work. Key features include:
In thick plate (1" or more), this is catastrophic. The crack is often followed by a loud "ping" and a visible gap of 1/16" or more. If the kerf width is too wide, the
Increase your cutting feed rate in the SheetCam tool table. Moving faster reduces the heat transfer to the material.
If the torch dwells too long in one spot, it dumps excessive heat into the surrounding material, expanding the Heat Affected Zone (HAZ) and worsening contraction stress upon cooling. Where SheetCam Fits In
By providing accurate and helpful information, I aim to assist users in understanding and addressing the issue of hot cracks in SheetCam, promoting safe and effective CNC plasma cutting practices.
Fortunately, resolving hot crack errors is often a matter of methodical troubleshooting. Follow these steps to overcome hot crack issues:
SheetCam is a popular software used for generating G-code for CNC machines, particularly for plasma cutting and engraving. While it's a powerful tool, users may occasionally encounter issues, one of which is the infamous "hot crack" error. In this article, we'll delve into the world of SheetCam hot cracks, exploring what they are, why they occur, and most importantly, how to troubleshoot and resolve them.