Crack - Sheetcam Hot 'link'
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Crack - Sheetcam Hot 'link'
Can you describe relative to your lead-in/lead-out points?
What and thickness are you currently cutting? Are you using plasma, laser, or oxy-fuel ? Where exactly on the part are the cracks appearing?
But what exactly is it? Is it a software glitch in SheetCam? A post-processor error? Or a physical law of metallurgy fighting back against your torch?
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. sheetcam hot crack
Worn nozzles distort the arc shape, slowing down the cut and increasing heat input.
The order in which parts are cut changes how heat builds up across the metal sheet.
Lower the water level or switch to a dry down-draft table for high-carbon alloys. Can you describe relative to your lead-in/lead-out points
Standard perpendicular or linear lead-ins cause sudden thermal shocks. Use a generous Arc Lead-In in SheetCam. This allows the torch to smoothly transition into the cut path, distributing the initial heat spike over a curve.
: Despite these complaints, many professionals swear by it because it generates efficient G-code for complex metal art that might "choke" more expensive software. For many, the software isn't broken or "cracked," but rather requires a specific workflow to master. 2. Physical Metallurgy: Preventing "Hot Cracking"
A hot crack often occurs at the (end of the cut) because the puddle is still liquid. In SheetCam, turn on Overburn . Where exactly on the part are the cracks appearing
Avoid straight-line lead-ins. An arc lead-in introduces the heat gradually and transitions smoothly into the cut path, distributing thermal stress.
: Users can set rules to reduce feed rates for small shapes, which helps manage the heat affected zone (HAZ) and reduces the risk of thermal cracking in sensitive materials like high-carbon steel. Summary of SheetCam Features for Cut Quality A couple of SheetCam Questions
