CNC Service Custom Logo Machining: A Practical Guide

Engraving a mark into a machined part is done one of four ways: milling the shape as a raised boss, cutting it below the surface, rolling or stamping it, or marking it with a laser. Each method leaves different geometry and different tool marks. Pick the wrong one and the logo either disappears after anodizing or costs more than the part itself.

Raised logos are milled with a small flat or ball end mill that leaves the shape standing 0.2–1.0 mm above the surrounding face. The tool must clear the smallest gap between strokes. If two letters sit 0.5 mm apart, a Ø1 mm cutter will not fit between them, so the logo has to be scaled up or the depth reduced.

Engraved logos cut inward. Depth is usually 0.1–0.5 mm on aluminum and stainless, deeper on plastics. Shallow engraving is cheap because it needs one pass with a small cutter. Deep engraving with vertical walls needs a second tool and sometimes a finishing pass, which adds setup time.

Laser marking is the fastest option for flat or gently curved faces. It removes or alters a thin surface layer with no cutting force, so thin walls and finished surfaces stay flat. The trade-off is depth: a laser mark is typically a few micrometres deep, so it will not survive heavy sanding or a thick powder coat.

A logo drawing is not a decorative image. The CNC service custom logo supplier needs vector outlines, not a JPEG or a screenshot. Send an SVG, DXF or a native CAD sketch with closed contours. Open paths and overlapping strokes create double-cut lines that show up as a burr along the edge.

State the stroke width, the depth and the wall angle. A 0.3 mm stroke with a 0.4 mm depth is near the limit for a Ø0.5 mm cutter. Below that, the tool breaks or the surface tears. If the brand mark has hairlines, ask the supplier to widen them before quoting; the page can be scaled without changing the design intent.

Internal corners are the other common failure. A round cutter cannot produce a sharp 90° inside corner. The corner radius equals the tool radius. For a 0.5 mm radius you need a Ø1 mm cutter; for a true sharp corner you need EDM or a broached insert, which changes the cost. Mark which corners must be sharp and which can carry a radius.

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  Vector onlySVG, DXF or CAD sketch with closed contours.
• 2
  Stroke widthKeep at or above 0.3 mm for milling; 0.15 mm for laser.
• 3
  Depth0.1–0.5 mm typical; specify a tolerance, not a range.
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  Corner radiusEquals tool radius; call out any corner that must stay sharp.

Aluminum cuts cleanly and holds fine detail. 6061 and 7075 both take a 0.3 mm engraved stroke without tearing. Anodizing adds 5–15 μm of oxide on the surface, so an engraved mark gets slightly shallower and a raised mark gets slightly taller. Hardcoat anodizing adds more and can round a sharp edge. If the logo must stay crisp after hardcoat, plan for it in the CAM file.

Stainless 303 and 304 machine well but work-harden at the cut. Light passes and a sharp cutter keep the edges clean. 316L is gummier and needs more care on fine strokes. Titanium TC4 (Ti-6Al-4V) also work-hardens, so a logo with thin raised lines on titanium is a slow job. Inconel is slower still and usually not worth it for a decorative mark.

Plastics behave differently. PMMA and PC can craze around a cut if the tool is dull or the feed is too high. POM and PEEK cut cleanly and hold a sharp edge. ABS tends to fuzz on a fine stroke. For plastic parts, laser marking often gives a cleaner result than milling because there is no cutting force to stress the surface.

Finishing comes after the mark, and it changes it. Bead blasting softens edges and can round a 0.1 mm detail. Polishing removes material, so a shallow engraving can disappear. Electroless nickel and zinc plating build a few micrometres and fill fine lines. Powder coating is the most aggressive and can bridge a 0.3 mm gap entirely. Decide the finish before you set the depth.

Choose milling when the logo needs depth, a raised profile or a specific surface texture. It is the only method that produces a true 3D mark with measurable depth. It also handles curved and angled faces if you use a 5-axis machine or a rotary table, so a logo can follow a cylindrical housing without distortion.

Choose laser marking when the mark is shallow, the part is thin, or the surface is already finished. There is no clamping force and no cutter to break. On anodized aluminum the laser can produce a black or white mark with good contrast and no post-processing. On bare metal the mark is a color change, not a cut, so it will not catch a fingernail.

Choose EDM only when the drawing calls for a sharp internal corner or a hard material that will not mill cleanly. Wire EDM cuts a through-profile; sinker EDM burns a shaped cavity with a graphite or copper electrode. Both need an electrode or a wire path, so they cost more per part and are usually reserved for tooling or small batches where geometry cannot be compromised.

For most parts, milling and laser are not competitors; they are a sequence. Mill the raised boss or the recess, then laser the fine text inside it. That combination gives depth and legibility without a fragile tool.