Implementing Material Pre-heating for Production

Why Pre-heating Matters

Cold material produces inconsistent first cuts. The laser's initial dwell heats the surface differently than steady-state cutting — resulting in a char-heavy start and variable finish. Pre-heating eliminates this in production runs.

The Pilot Light Technique

Program a 2–3 second dock over a waste area at 5–8% of your cut power with air assist active. This pre-stabilizes surface temperature so the first cut matches every subsequent pass.

LightBurn Implementation

Add a small filled rectangle in a separate layer at low power (5%), Fill mode, ordered first. Place it just off your cut area or overlapping a waste edge. The brief low-power pass warms the surface without visible marking on most woods and acrylics.

Air Assist Timing

Start air assist 0.5–1 second before the laser fires. After a break, 30 seconds of air before resuming prevents focal length shift from a cold lens.

Material Notes

Acrylic: Pre-heat at 3% for 2 seconds. Cold acrylic chips on the first pass — pre-heated acrylic flows cleanly from cut start.

Plywood: A 2-second low-power pass clears surface moisture variation. Critical in humid shops.

Anodized aluminum: No pre-heat needed — ablation temperature is consistent regardless of starting temp.

Measuring Results

Run a 20-piece test with and without pre-heat. Measure kerf width at start, middle, and end. Pre-heat should bring start-of-cut kerf within 0.05mm of mid-cut kerf.