01
Gasket groove out of flat, water gets in
A groove machined on a warped plate will not seal. Rain or wash-down water follows the low side, reaches the PCB and the reader drops offline. We check flatness before the groove is cut.
CNC Machined Enclosure
Aluminum Alloy Access Control Panel Enclosure
We machine aluminum alloy access control enclosures from 6061 or 6063 plate: pocketed walls, gasket grooves, board bosses and tamper-proof screw holes. One prototype or a 10,000-part run, held to ±0.005 mm.
6061-T6 / 6063±0.005 mmIP-rated gasket groovesAnodized finishNo MOQ12-hour DFM
127High-precision CNC machines
16Simultaneous 5-axis centers
±0.005 mmAchievable tolerance
3–5 daysTypical part shipping
Field problems
Where access control enclosures fail
Most failures show up after installation, not on the drawing.
02
Reader and board holes that do not line up
If the reader cutout drifts 0.2 mm from the board bosses, screws cross-thread on the line and panels get scrapped. Position tolerances must hold across the whole face, not just one hole.
03
Bosses too thin, threads strip on site
An M3 boss with 1.5 mm wall thickness pulls out the first time a technician over-torques it. The panel then needs a service call. Boss wall and thread depth have to be designed for the torque, not for the smallest amount of material.
04
Cosmetic marks on a visible face
Access panels sit at eye level in offices and lobbies. Clamp marks, burrs and a mismatched anodize batch are the reasons a functional enclosure gets rejected at goods-in.
How we build it
One enclosure, machined in one setup where it matters
Pockets, grooves and mounting faces held to one datum.
Machining strategy
Cut the sealing face and the board pockets on the same datum
An aluminum alloy access control enclosure is mostly a sealing problem with a PCB inside it. The gasket groove, the reader window and the standoff bosses all have to sit on one datum, or the lid pulls the groove open on one side. We machine the outer face, flip the part once, and cut the pocket, groove and bosses in the second setup against that same face.
For housings up to 750 × 1,150 × 550 mm we run this on a 5-axis center so the side walls and corner radii come off without a third fixture. Smaller reader housings go on the 500 × 500 × 450 mm machines. Wall thickness of 2.5–3 mm is normal for 6061-T6; below 2 mm the wall deflects under clamp load and the groove depth wanders.
- 1One datumGroove, window and bosses cut against the same reference face
- 2±0.005 mmPosition tolerance on hole patterns and boss locations
- 32.5–3 mm wallsThin enough for weight, thick enough to hold a thread
Sealing and hardware
Grooves sized for the gasket you actually buy
Gasket grooves fail for boring reasons. The groove is too deep, the cord does not compress, and the joint leaks at 0.5 bar. Or the groove is too shallow and the lid will not close flat. We cut the groove from the cord diameter you specify, usually a 2 mm or 3 mm silicone cord with 20–30% compression, and we hold groove width to ±0.05 mm so the cord stays seated during assembly.
Hardware matters just as much. Tamper-proof Torx or snake-eye screws need a counterbore deep enough that the head sits below the surface, and a thread depth of at least 1.5 × diameter in aluminum. We cut these together with the pilot holes, so a technician on site is not reaming a hole to make a screw fit. Anodizing goes on after machining; masked areas stay conductive where the lid needs a ground path.
- 1Cord-matched groovesWidth and depth cut to your gasket diameter and compression
- 2Thread depth ≥1.5 × DEnough engagement for tamper-proof screws in aluminum
- 3Masked ground pathsConductive contact areas kept clear during anodizing
Material and process choice
Which aluminum and which process for your housing
Pick by wall thickness, volume and how the part is loaded.
| Option | Best for | Watch out for |
|---|---|---|
| 6061-T6 plate | Machined enclosures, tight tolerances | Higher cost per kg than extrusion |
| 6063 extrusion | Long, simple rectangular housings | Limited pocket depth, thin wall risk |
| ADC12 die casting | Volume above a few thousand parts | Porosity near thin walls, tooling lead time |
| Sheet metal + machined front | Large flat panels, low tooling cost | Seam sealing and flatness on long edges |
| Anodize clear / black | Visible faces, mild corrosion | Colour batch variation between runs |
| Hardcoat anodize | High-wear keypad and reader faces | Builds up 25–50 μm, affects tight bores |
What we do
Services behind an access control enclosure
Most projects use two or three of these together.
01
5 Axis CNC Machining
Reader housings and sealed boxes with angled faces, corner radii and side features cut in one setup. Up to 4,000 mm of travel.
02
3 and 4 Axis CNC Machining
Flat covers, back plates and mounting brackets. Fast cycle times when one face carries most of the features.
03
CNC Milling & Turning
Bosses, standoffs, threaded inserts and turned collars for the reader or camera module.
04
Sheet Metal Fabrication
Large door-frame panels and back boxes, bent and welded, with a machined front plate where tolerance matters.
05
Rapid Prototyping
One enclosure for fit check before tooling. Same material family, same wall thickness as production.
06
Part Surface Finishing
Anodizing, powder coating, bead blasting, laser marking of logos and port labels.
Scope
What is included in a machined enclosure order
Standard scope, unless your drawing says otherwise.
| Item | Included | Notes |
|---|---|---|
| Material | 6061-T6, 6063, 6082 | Certificates on request |
| Tolerance | ±0.005 mm on critical features | General features per drawing title block |
| Finish | Anodize, powder coat, bead blast | Colour matched to your sample or code |
| Hardware | Tamper-proof screws, gasket, mounting kit | Sourced to your spec |
| Inspection | 100% before shipment | Reports on request |
| Marking | Laser marking, 1.5 mm minimum character height | Serial numbers and port labels |
Why GreatLight
Numbers behind the enclosure work
Fifteen years of machining, three plants, one quality system.
15Y
Machining since 2011
Fifteen years of aluminum work, most of it on housings and brackets where wall thickness and flatness decide whether the part passes.
127
CNC machines on site
Sixteen simultaneous 5-axis centers, twelve 4-axis mills, twenty-seven 3-axis machines and sixteen mill-turn centers. Capacity for one piece or a full run.
±0.005
Millimeters, not words
We quote the tolerance your drawing calls out and hold it. Critical hole positions are checked against the datum, not against a random edge.
99.99%
Qualification rate
Raw material check, in-process monitoring and final inspection on every order. Inspection reports on request.
12h
Quote and DFM turnaround
Send a STEP file and we return a quotation with free DFM comments within 12 hours. Production can start in 24 hours.
0
Minimum order quantity
One prototype or 10,000+ parts. No setup fee games, no minimum you have to hit before we run the job.
7,600 m²Manufacturing space
3Wholly-owned plants
150Technicians
<2%Historical late-delivery rate
Industry fit
What these industries ask for
Building access control
Wall and door-side reader housings that must seal against rain and stay flat against a glass or concrete face.
- 6061-T6
- Gasket groove ±0.05 mm
- Anodized
Industrial machinery
Control boxes mounted where vibration and coolant mist are constant. Thicker walls and a machined flange do the work.
- 3 mm walls
- Machined flange
- Powder coat
Electronics and data rooms
Rack-adjacent housings where EMI contact and cable cutouts matter as much as the seal.
- Masked ground path
- Cable cutouts
- Laser marked
Robotics and automation
Controller enclosures with connector panels that must align to a mating harness on the cell.
- ±0.005 mm
- Connector pattern
- Hardcoat anodize
FAQs
Questions engineers ask before ordering
Which aluminum alloy should I use for an access control enclosure?
6061-T6 is the default. It machines cleanly, holds a thread, and anodizes to a consistent finish. Use it for reader housings and any part with a gasket groove or thin wall.
6063 is a better choice for long, simple rectangular boxes where you want a smoother extrusion surface. 6082 sits between the two and is common in Europe. Avoid 7075 unless you need the strength; it costs more and anodizes to a darker, less uniform tone.
How do you keep the gasket groove sealing after anodizing?
Anodizing builds 10–25 μm of oxide on the surface, and that growth happens on the groove walls as well as the outside. We cut the groove to allow for the coating when the drawing tolerance is tight, and we mask the sealing face if your gasket needs bare aluminum contact.
If you run hardcoat, the buildup is 25–50 μm and the effect is larger. Tell us the finish before we program the groove, not after.
Can you machine the enclosure and the front panel as a matched pair?
Yes. We cut both parts against the same datum and keep them as a pair through finishing, so the screw holes in the cover line up with the tapped holes in the body. The parts are marked with the same job number.
For paired parts we recommend a common fixture and one inspection report covering both. That removes the argument about which half is out of tolerance if a joint does not close.
What wall thickness can you hold on a machined aluminum housing?
2.5–3 mm is the practical range for 6061-T6 walls on an enclosure up to a few hundred millimeters across. You can go to 2 mm on small reader housings if the wall is short and supported by bosses.
Below 2 mm the wall deflects under clamping and the groove depth drifts. If your design needs a thinner wall for weight, we will say so in the DFM review and suggest where to add a rib instead.
How do you handle tamper-proof and security screws?
We cut the pilot hole, the counterbore and the thread to suit the exact screw you specify. Torx, snake-eye and one-way screws all need a counterbore deep enough that the head sits below the outer surface.
Thread engagement in aluminum should be at least 1.5 × the screw diameter. For an M3 screw that means about 4.5 mm of thread, which usually means a local boss rather than the panel wall alone.
What is the lead time for a machined enclosure prototype?
We return a quotation with free DFM analysis within 12 hours of receiving a STEP file. Production can start within 24 hours, and parts typically ship in 3–5 days for standard machined enclosures.
That timeline assumes the drawing and finish are settled. Changes to the gasket spec or the anodize type after machining starts will push the ship date, so it is worth locking those details at quote stage.
Do you mark logos and port labels on the enclosure?
Yes, by laser marking or engraving. The minimum character height we can hold is 1.5 mm, which covers most port labels and serial numbers.
Marking is done after anodizing where a contrast mark is wanted, or before coating where the mark should be flush and uncolored. Tell us which look you need and we will sequence the process to match.
Can you work from a sample instead of a drawing?
We can, if the sample has enough features to measure. We will reverse-engineer the geometry, build a model, and send it back for your approval before cutting metal.
For enclosures with a sealing groove, we also ask for the gasket or its part number. Groove width and depth depend on the cord diameter, and guessing that dimension is the fastest way to a leaking box.
Send your enclosure drawing, get a quote in 12 hours
Upload a STEP file and we return pricing, a DFM review and a finish recommendation. No minimum order quantity, 100% inspection before shipment, NDA on request.
12-hour quote100% inspectionNo MOQNDA available
