Quoting laser work on cut length alone loses money on complex parts
Pierces, rapid moves, gas changeovers and sorting all scale with feature count rather than perimeter, and simple estimating models miss all four.
The straightforward way to estimate a laser-cut part is to total the cut length, divide by the feed rate from the cut chart, add a setup allowance and price the material. It is quick, it is defensible, and on parts with many features it is wrong in a consistent direction.
What the model misses
Pierces. Every internal feature requires a pierce, and a pierce takes time that has nothing to do with cut length. A part with forty holes carries forty pierces, and on thicker material pierce time can exceed cutting time.
Rapid moves. The head travels between features. On a part with scattered small features, traverse time is significant and grows with feature count, not perimeter.
Acceleration. Cut charts state a steady-state feed rate. A contour with many corners never reaches it, so actual time exceeds calculated time by a margin that grows with geometric complexity.
Gas and nozzle changeovers. A job requiring a different gas or nozzle from the one currently loaded carries a changeover that a per-part model does not see.
Sorting and handling. Small parts, parts requiring micro-joint removal, and parts needing deburring all consume labour after the cut.
Why the error is systematic
Every one of these scales with complexity, and every one is omitted by a length-based model. The result is that simple parts are quoted accurately or slightly high, while complex parts — usually the higher-value work — are quoted low.
Shops using this model often conclude that complex work is unprofitable and simple work carries the business, when the actual situation is that complex work is mispriced.
What better estimating looks like
Modern nesting and CAM software simulates the actual program and reports a realistic cycle time including pierces, traverses and acceleration. Using that figure rather than a calculated one removes most of the error at essentially no cost.
Adding a per-feature allowance for post-processing, and a changeover allowance at the job rather than part level, covers the rest.
The practical test
A shop that suspects it has this problem can check quickly: take a handful of recent complex jobs, compare quoted time against the machine's recorded actual time, and look at whether the gap correlates with feature count. If it does, the estimating model is the problem, and it is a cheaper fix than most.
This article was produced by the LasersNews AI desk and reviewed by our editors.
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