CNC Machined Anodized Aluminum Sensor Enclosure
Sensor enclosures machined from 6061-T6, with 3 mm walls held to ±0.1 mm, a H7 lens bore coaxial to the mounting face within 0.03 mm, a 4 mm gasket land flat to 0.05 mm and an IP67 water test before packing. Anodized inside and out with the earth boss masked.
- Walls Held at 3 mm
- Lens Bore H7 to the Mount
- IP67 Gasket Land Machined
- Anodized Inside and Out
*Send the sensor body drawing and the lens thread. The bore is set from the optical axis, and the gasket land has to sit on the same plane as the window recess or the seal is compressed unevenly.
Sensor Enclosure Overview
An enclosure for a sensor is an optical part as much as a box: the lens bore has to point where the bracket points, the window has to sit square, and the gasket land has to be one flat plane or water finds the low corner.
The block is squared, the mounting face is machined as datum A, the bore is cut from that datum, then the pocket is roughed and finished with a small cutter to keep the wall even before the gasket land is faced in one pass.
6061-T6 Aluminium Block
6061-T6 is used for the wall stability: a 3 mm wall machined from solid stays straighter after anodizing than a cast or folded housing, which matters when the bore has to stay coaxial.
6082-T6 or 7075-T6
6082 is chosen when the housing is also a heat path for the sensor electronics, and 7075 when the bracket clamps the housing and the wall has to resist crushing at the clamp screws.
Below 2.5 mm the wall deflects when the lid screws are torqued and the gasket land lifts at the corners; above 4 mm the housing becomes a heat sink you did not ask for.
Sensor Enclosure Specifications
Milling and boring data for sensor housings, with the wall, bore and sealing values that decide whether the unit stays dry and in focus.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Sensor Enclosure / Camera Housing | Machining Process | 3-Axis CNC Milling, Boring, Tapping |
| Material | 6061-T6 Aluminium Block | Envelope | Up to 180 × 120 × 90 mm |
| Wall Thickness | 2.5 – 4 mm, ±0.1 mm | Pocket Depth | ±0.05 mm |
| Lens Bore | Ø 20 – 60 mm, H7, Roundness 0.02 mm | Bore to Mount | Coaxial Within 0.03 mm |
| Gasket Land | Width 4 mm, Flatness 0.05 mm | Sealing | IP67, 30 min at 1 m |
| Mounting Face | Flat 0.05 mm, Square to the Bore 0.05 mm | Threads | M2 – M6, Depth 1.5 × Diameter |
| Window Recess | Depth ±0.05 mm, Square 0.05 mm | Edge Break | 0.4 mm, No Burr Inside |
| Customization | Cable Gland, Connector Cut-out, Sun Shade, Mounting Lugs | Lead Time | 5 – 7 Days Sample, 12 – 16 Days Batch |
| Inspection | CMM Bore to Mount, Air Gauge Bore, IP67 Water Test | Packing | Foam Cradle, Window Protected, Boxed |
Key Features of Our Sensor Enclosures
Bore and mount from one datum, land faced in one pass, water tested.
Bore Cut From the Mounting Face
The lens bore is machined with the mounting face as datum, so coaxiality stays within 0.03 mm and the field of view does not drift when the bracket is changed.
Gasket Land Faced in One Pass
The land is finished in a single continuous pass at 0.05 mm flatness, which is what makes an IP67 seal repeatable instead of dependent on gasket compound.
Even Wall by Roughing Both Sides
The pocket is roughed from both directions before finishing, so the wall does not spring when the last 0.5 mm is removed and the bore stays round.
Water Tested Before Packing
Each housing is assembled with a blank window and immersed for 30 minutes at 1 m; a housing that weeps is re-machined, not re-sealed.
Enclosure that has to stay dry and in focus?
Surface Finishes for Sensor Enclosures
The outside is a cosmetic and optical surface, the inside is a reflection problem, and the threads and earth boss are functional.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Black Anodizing | Non-reflective body for vision sensors | Clear Anodizing | Natural finish on indoor units |
| Masked Earth Boss | Keeps the ground path conductive | Bead Blasting | Even matte before dye |
| Masked Threads | Threads stay at gauge size | Chromate Conversion | Conductive finish on EMC housings |
| Laser Marking | Serial and lens focal length | Anodizing Build | 10 – 15 µm, Sealed |
| Window Recess Protection | Taped During Coating | Vapour Blasting | Satin Interior Finish |
| Interior Coating | Stops internal reflections | Assembly Clean | Ultrasonic Before Sealing |
*Anodizing inside a closed pocket is uneven because the dye cannot circulate. Housings that need a fully black interior are bead blasted and dyed before the pocket is closed, or the interior is painted matte black after coating.
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Machining Process for Sensor Enclosures
The lens bore and the mounting face are cut in one set-up, so the sensor looks where the bracket points instead of a degree off.
01. Optics and Bracket Review
Check the sensor body, the lens thread and the bracket pattern, then fix the bore axis and the mounting face before any metal is cut.
02. Square and Face the Block
Machine the block square, face the mounting side and establish datum A, since the bore, the pocket and the land are all called from it.
03. Bore the Lens Seat
Drill, bore and finish the lens bore to H7 with the block still on datum A, checking roundness with an air gauge at two depths.
04. Pocket the Body
Rough the pocket from both directions, finish with a 6 mm cutter to keep the wall even, then face the gasket land in one continuous pass.
05. Drill, Anodize, Water Test
Drill the connector cut-out and the lid threads, mask the earth boss and threads, anodize, then assemble and water test before packing.
Send the sensor drawing and the bracket pattern, and we will quote a housing with the lens bore and the mounting face cut from one datum.
Sensor Enclosure FAQs
0.03 mm, because the bore is cut before the block leaves datum A. That is what keeps a 12 mm sensor from drifting half a degree when the bracket is swapped.
Yes, with a 4 mm land flat to 0.05 mm and a moulded gasket. The land is the part that matters: a 0.1 mm dish will pass a splash test and fail a 30 minute immersion.
3 mm for a 120 mm housing. At 2.5 mm the lid screws pull the wall in and the land lifts at the corners; at 4 mm the housing gets heavy on a moving axis.
It adds about 10 µm on the flanks, so threads are cut oversize and plugged during coating. Every thread is gauged after anodizing, and the lens must screw in by hand.
Yes, matte black anodizing or a matte black paint on the interior. A shiny interior will bounce light from an LED ring back into the lens and wash out the image.
A blank window is fitted, the lid is torqued to the specified value and the unit is immersed for 30 minutes at 1 m. Test results are recorded per serial number.
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