A front panel is a thin part with a lot of features and a visible surface — the worst combination for machining, because thin plates deflect and every mark shows. The engineering problem is fixturing: hold the plate flat without clamping it out of flatness, and the machining is straightforward.
The same part can be produced several ways, and the choice is decided by volume and geometry rather than preference. We quote whichever is actually cheaper for your quantity.
| Approach | How it works | Best at | Watch out for |
|---|---|---|---|
| Machined from plate | Plate held on a vacuum table or fixture plate, all cutouts and holes machined | 1–500 pieces; prototypes; panels with complex cutout patterns | Thin plates deflect; fixturing decides flatness more than the machining does |
| Machined + engraved | Panel machined, then text and graphics engraved or laser marked | Small batches where screen printing is not economic | Engraving depth and anodize contrast need to be specified together |
| Extruded panel + machining | Standard extruded front panel profile cut to length, ends and holes machined | Rack-mount and instrument panels at volume, standard heights | Limited to standard heights and widths; profile features are fixed |
| Sheet metal + machining | Sheet cut and formed, then holes and cutouts machined or punched | Large thin panels where weight and cost dominate | Form tolerance is looser than machining; flatness after forming varies |
These are the decisions that account for most of the cost difference between two parts of the same overall size.
| Feature | Recommended | Why it matters |
|---|---|---|
| Panel thickness | 2mm minimum for machining; 1.5mm with care | Thinner plates deflect and cannot hold flatness |
| Minimum feature spacing | ≥ 1.5× panel thickness from an edge | Too close and the edge distorts or tears |
| Cutout corner radius | ≥ 0.5× cutter diameter (min 1mm) | Sharp corners are a hand-finishing operation |
| Hole position | ±0.1mm typical; ±0.05mm for connectors | Connector cutouts are where alignment matters |
| Flatness | 0.1mm over 300mm typical | Depends on fixturing and stress-relieved stock |
| Surface finish | Bead blast before anodize for uniform matte | Hides tool marks far cheaper than a fine machining pass |
| Anodize masking | Mask grounding pads and threaded inserts | Anodize is an insulator and changes hole sizes |
A 2mm panel held in a vise bows upward between the jaws, so the cutter removes more material in the middle than at the edges — and the panel ends up thinner in the centre and not flat. The fix is to hold the whole surface, not the edges: a vacuum table, or double-sided tape on a fixture plate.
This is why a front panel can quote higher than a much larger bracket. The machining time is small; the setup — cleaning the fixture plate, taping or sealing the panel, checking it is flat — is the cost. Panels with many small cutouts are also slow because every cutout is a separate toolpath.
| Cost element | Share of price | What to change if it is too high |
|---|---|---|
| Fixturing and setup | 30–45% of part cost | Vacuum or tape setup is skilled work and does not scale down with panel size |
| Cycle time | 25–40% | Many small cutouts are slower than one large pocket |
| Material | 8–15% | Thin plate is cheap; the cost is in handling it |
| Finishing (anodize, print) | 15–25% | Anodize plus screen print or engraving |
| Inspection | 3–6% | Flatness and cutout position |
A 300 × 200mm panel with two large cutouts machines faster than a 150 × 100mm panel with twenty small ones. Every cutout is a toolpath, a retract, a reposition and often a tool change. When a design has many small features, consolidating them — or moving to a punched sheet-metal panel — is the biggest available saving.
Engraving is priced the same way: it is time on the machine, not area covered. A few short labels cost little; a full instrument face with hundreds of characters adds real money.
The usual sequence is anodize, then screen print or laser mark, because printing on bare aluminum does not survive. If the design calls for engraved text filled with a contrasting color, the engraving happens after anodize and the fill is a separate step. Specify the sequence — it affects both cost and durability.
Front panels are usually visible and often sit next to each other, so color match matters more than on hidden parts. Buy material for the whole run at once, keep the anodizing lot together, and bead blast before anodize for a uniform base. Expect slight variation between separate anodizing lots.
Anodizing is done at elevated temperature and can relax residual stress in a thin panel, causing it to bow. Stress-relieved stock (6061-T651) and a pre-anodize stress relief help. If flatness is critical, specify it after finishing rather than before.
2mm is comfortable; 1.5mm is achievable with vacuum fixturing and light passes. Below 1.5mm the panel deflects during machining and may not hold flatness after anodizing. For panels thinner than 1.5mm, sheet metal with punched or laser-cut features is usually the better process.
By supporting the whole surface rather than clamping the edges. A vacuum table pulls the panel flat against a fixture plate; double-sided tape achieves the same on a smaller scale. Vise clamping on a thin panel bows it and produces a part that is thinner in the middle and not flat.
Engraving is more durable and better for low volume; screen printing is cheaper per unit at volume and allows multiple colors. For small batches, laser marking after anodize is often the most economical durable option. The choice affects the finishing sequence, so decide before the drawing is released.
Approximately, not exactly. Anodize color depends on alloy lot, bath chemistry and rack position, so a new lot will not perfectly match an old one. If panels must match, order them together in one production run. Providing a physical sample helps the anodizer target the color but does not guarantee a match.
Include the quantity, whether the finish is visible, and which fits or seals are critical. You get a line-item quote within 24 hours and DFM notes on the features driving your price.