Crack !!link!! - Sheetcam Hot

In the Jet Cutting Operation, find the Overcut value. Enter a negative number (e.g., -0.10"). This leaves a small tab. Be precise, as the timing must be dialed in to ensure the part is held securely but can be knocked out easily later.

Avoid straight line lead-ins that hit the part at a 90-degree angle. Use an arc lead-in (typically 3mm to 6mm in radius) to allow the torch to transition smoothly onto the cut path, distributing the initial thermal shock away from the final part edge.

setting in the Cut Path tab to ensure internal contours are cut before the outside. Start Point Clearance

Fabricators utilize SheetCam’s specific toolset to engineer around these thermal limitations. The software allows for precise control over the "Thermal Identity" of a part through several key features: Path Rules and Speed Optimization: sheetcam hot crack

Use SheetCam’s nesting optimization to cut internal geometries (holes) first, followed by external profiles.

Hot cracking refers to the formation of small, often microscopic fractures along the heat-affected zone (HAZ) or directly on the kerf edge of a thermally cut metal. Unlike structural welding hot cracks (which occur during solidification of a weld pool), cutting-induced hot cracks are primarily driven by severe thermal gradients.

A lead-out tells the torch to steer away from the finished part edge into the scrap material before shutting off. In the Jet Cutting Operation, find the Overcut value

Set a "drill bit" or "drilling" operation with a tool specific to your material.

SheetCam does not physically cut the metal, but it dictates exactly how the heat source interacts with it. Improper lead-ins, incorrect feed rates, and poor path planning in SheetCam can cause the torch to linger, overheat, or stress vulnerable areas of the part.

By treating thermal cutting as a precise metallurgical process, you can use SheetCam's robust toolpathing capabilities to manage heat, control stress, and deliver clean, crack-free edges on every project. If you want to tailor this further, tell me: Be precise, as the timing must be dialed

A lead-out allows the torch to cross past the finish line before turning off. This moves the final "extinction crater"—where the arc dies and leaves a cooling shrink point—away from your finished piece. 2. Implement Overcutting

Worn nozzles distort the arc shape, slowing down the cut and increasing heat input.

The torch plunged. The arc stabilized. The cut traced the hole like a surgeon's scalpel. Then the main contour. Then the part dropped.

If you’ve been running a CNC plasma table for a while, you’ve likely encountered a few "ghosts in the machine"—those frustrating cut quality issues that seem to appear out of nowhere. One of the more technical challenges operators face is .

While "hot crack" is not a built-in "one-click" feature in SheetCam, users typically implement features to prevent cracking or heat-related defects (like "hot cracking" in welding or thermal stress in plasma cutting) through specialized .