How to Make a Supervisor Panel by Laser Cutting

• 1
  What matters most
• 2
  Choosing sheet and thickness for a supervisor panel
• 3
  Kerf, tab, and hole layout before you cut
• 4
  Bend relief and forming sequence after laser cutting
• 5
  Deburring, finishing, and first-article checks
• 6
  When laser cutting is the wrong choice for a panel
• 7
  Supervisor panel laser cutting in 6 steps
• 8
  Laser cutting vs CNC machining vs stamping for panels

Most supervisor panels are a front plate with cutouts for displays, buttons, and connectors. The sheet has to hold those cutouts without bowing, and it has to survive whatever finish the customer specifies. For powder-coated indoor panels, 1.5 mm to 2 mm cold-rolled steel or 5052 aluminium covers the common range. For outdoor or washdown cabinets, 304 or 316 stainless at 1.5 mm and up is the usual choice.

Thickness drives the process more than the alloy does. Below 1 mm, laser cutting is fast but the panel flexes during handling and the flatness callout becomes hard to hold. Above 6 mm, heat input starts to show as a visible taper on the cut edge and the cutting speed drops sharply. If the drawing asks for a 10 mm front plate, question whether the panel is structural or just a cover.

Grain direction matters when the part gets formed after cutting. A 5052 or 6061 sheet formed across the rolling direction cracks at a tighter radius than the same sheet formed along it. Put the bend lines across the grain when the radius is tight, and note the direction on the cut file so the operator can rotate the nesting.

Finish choice feeds back into material. Clear anodizing shows every alloy inclusion on 6061; hardcoat changes the dimension by roughly half the coating thickness per side. If the connector bores are tolerance-critical, either mask them before anodizing or plan a post-coat reaming pass.

• 1
  Indoor panel1.5–2 mm cold-rolled steel or 5052 aluminium
• 2
  Outdoor or washdown304 or 316 stainless, 1.5 mm and up
• 3
  Heavy front plate3–6 mm steel, cut slow to control taper

Laser kerf is not a constant. On a 1.5 mm mild steel sheet, a fiber laser typically removes 0.1 mm to 0.2 mm of material along the cut path. On 6 mm stainless, that figure rises and the edge shows more taper. The practical consequence is simple: a hole drawn at Ø12.00 mm comes out slightly larger than the drawing, and a boss drawn at Ø12.00 mm comes out slightly smaller. Give a tolerance band on the drawing rather than a single number.

Tab placement controls whether the panel stays flat. When you cut a large rectangular opening, leave small tabs of 0.3 mm to 0.5 mm that the operator snaps or files off. Fewer than four tabs on a 200 mm opening lets the slug drop and mark the panel face. Too many tabs leave file marks that show after powder coating.

Hole-to-hole spacing needs a minimum web. Keep at least 2 mm of material between adjacent cutouts, and at least 1.5 times the sheet thickness between a cutout and the panel edge. Below that, the heat from two nearby cuts softens the web and the panel bows as it cools.

Text and logos cut into the panel have their own limit. Laser marking and engraving at GreatLight hold a minimum character height of 1.5 mm, and cut-through lettering needs a wider stroke than engraved lettering. If the customer supplies artwork with thin strokes, thicken them before cutting rather than after.

• 1
  Kerf on 1.5 mm mild steel0.1–0.2 mm removed along the path
• 2
  Minimum web between cutouts2 mm of remaining material
• 3
  Edge distance1.5 × sheet thickness or more

A laser-cut blank goes to the press brake next, and that is where most first-article problems appear. Sharp inside corners at a bend line concentrate stress. Cut a relief slot of 0.5 mm to 1 mm wide at each end of the bend line, and make the slot depth at least the sheet thickness. Without it, the panel tears at the corner and the crack opens up under powder coating.

Forming sequence should go from the inside out. Bend the short flanges first, then the long edges. Bending a long edge first can block the punch from reaching a nearby short flange, and forcing it leaves a tool mark on the visible face. If the panel has four flanges, check that the brake tooling can clear the already-formed sides.

For a panel with a tight radius, keep the inside bend radius at or above one times the sheet thickness for steel and roughly one and a half times for 6061 aluminium. Anything tighter risks surface cracking, especially on hard-tempered tempers. Annealed tempers form better but scratch more easily during handling.

If the front plate carries a machined connector bore with a ±0.005 mm callout, do not try to hold that on the laser. Cut a pilot hole, form the panel, then machine the bore in a second setup. That split keeps the tight tolerance on the machine tool and the flexible work on the sheet.

• 1
  Relief slot width0.5–1 mm at each bend end
• 2
  Relief depthAt least one sheet thickness
• 3
  Inside radius1 × thickness for steel, 1.5 × for 6061

Laser cut edges carry a small dross layer on the underside, especially on stainless and on thicker mild steel. Deburr both faces before any coating. A bead blast or a tumble pass removes the dross and gives the coating a uniform key. If the panel will be anodized, skip the aggressive mechanical deburr on the visible face and let the chemical bright dip handle it.

Powder coating adds thickness on every face, typically 60 μm to 100 μm per side. That matters where a connector sits flush or where a gasket seals against the panel. Note the coated dimensions on the drawing, or mask the sealing faces before coating. Anodizing is thinner, usually 5 μm to 25 μm depending on the type, but hardcoat can reach 50 μm and does change a press fit.

Inspection should mirror the drawing. Check the overall outline, the position of each cutout from a common datum, the bend angles, and the flatness across the panel face. A granite surface plate and a height gauge catch most of it. For panels with a tight connector pattern, a CMM report gives the customer something to file.

GreatLight inspects 100% of parts before shipment, with a raw material check, in-process monitoring, and a final inspection. Reports are available on request. The four quality systems in place are ISO 9001:2015, IATF 16949:2016, ISO 13485:2016, and ISO 27001:2022.

• 1
  Powder coat build60–100 μm per side
• 2
  Anodize build5–25 μm, hardcoat up to 50 μm
• 3
  Inspection100% before shipment, reports on request

Laser cutting wins on thin sheet, complex outlines, and low volume. It loses when the panel is thick, when the edge needs a machined finish, or when the quantity is high enough that a die pays for itself. A 6 mm front plate with a dozen rectangular openings is fine on a laser. A 12 mm plate with the same openings is not, because the cut edge will show taper and the cycle time climbs.

Stamped production is the alternative once annual volume passes a few thousand identical panels. The tooling cost is real, but the per-part cost drops and the edge quality is consistent. Between laser and stamping sits CNC machining, which is the right answer when the panel is a thick plate with tight bores and a flatness callout that a formed sheet cannot hold.

At GreatLight, the machining side covers 127 high-precision CNC machines, including 16 simultaneous 5-axis centers, 12 four-axis mills, 27 three-axis machines, and 16 mill-turn centers. Maximum processing size is 4,000 mm, with travels of 4,000 × 400 × 150 mm on the large frames and 750 × 1,150 × 550 mm on the medium ones. Those are the numbers to check when a panel outline grows past the sheet size the laser can handle.

A mixed route is often the cheapest. Laser cut the outline and the display opening, form the flanges, then machine the connector bores and the mounting pads on a 3-axis or 5-axis mill. The sheet does the flexible work, the machine tool does the accurate work, and neither operation fights the other's tolerance.

• 1
  LaserThin sheet, complex outlines, low to mid volume
• 2
  CNC machiningThick plate, tight bores, flatness callouts
• 3
  StampingHigh volume of identical panels