Why does the lid press frame of an Outdoor two-way radio protective hard box leave clearance?

The frame keeps one clear layer above the groove tops so closing locates the insert without bearing on the walls; too little transmits rig vibration into the base, too much lets the insert shift on drop.

How does the 14 mm groove pitch relate to wall support?

Pitch is the clear gap between adjacent walls, milled from 40 kg/m³ EVA over a continuous base layer; lower density collapses the walls, higher density raises transmitted acceleration.

How is the ≤4.5 g transmitted acceleration read across the sweep?

The rig sweeps 5–200 Hz with base and table channels sampled together, and the full-band ratio ceiling meets ≤4.5 g; resonance peaks are logged alone, never substituting for the band.

Which groove items are re-checked after a 1.2 m six-face drop?

Pitch of 14 mm, wall thickness and the continuous base layer are measured per unit against a no-collapse verdict, with a 72 h salt spray re-check and a separate 350 N latch-force re-read.

How is the ≤0.6 mm latch clearance judged after 4000 cycles?

A feeler gauge reads both latch tongues and takes the larger value; excess clearance checks the seat insert then frame clearance, and cycling leaves the groove layout unchanged.

Outdoor two-way radio protective hard box

Quick answer: An Outdoor two-way radio protective hard box caps acceleration at 4.5 g across 5-200 Hz and keeps latch clearance under 0.6 mm after 4000 cycles.

Lid inner press-frame clearance of the Outdoor two-way radio protective hard box
Antenna groove pitch and groove-wall support
Transmitted acceleration readings across the sweep band
Groove re-check after six-face drop
Clearance verdict on the open-close life rig
FAQ

1. Lid inner press-frame clearance of the Outdoor two-way radio protective hard box

An Outdoor two-way radio protective hard box leaves its lid press-frame clear of the foam groove tops, so closing only locates the EVA insert without bearing hard on the groove walls. The shell is moulded at a 3.6 mm wall, 480×350×190 mm outer and 425×290×140 mm inner, 3.4 kg empty and 7 kg loaded. Clearance is set to one value for all 12 grooves, with the frame edge landing on the rib between grooves rather than over a groove mouth. Too little clearance transmits rig vibration straight into the base; too much lets the insert shift on drop. The frame is moulded with the lid and its clearance fixed in the tool. JUNZHIJIA files clearance, 14 mm groove pitch and 40 kg/m³ EVA density together in the first-article record.

Clearance logs only frame-to-groove-top distance and is never mixed with groove-depth tolerance.

Slot group	Pitch and wall	Inspection item
Front row of 12 grooves	14 mm pitch	Wall clear distance
Rear row of 12 grooves	40 kg/m³ EVA density	Wall non-collapse verdict
Groove-wall root	Continuous base layer	Load path uncut

2. Antenna groove pitch and groove-wall support

An Outdoor two-way radio protective hard box mills 12 grooves into the base pad, where 14 mm pitch is the clear gap between adjacent walls and wall thickness sets isolation stiffness with it. EVA density of 40 kg/m³ is used: lower density lets walls collapse under the 7 kg load, higher density raises transmitted acceleration. Both walls of each groove come from the same pad, with a continuous layer under the groove and an uncut wall root, so six-face drop loads travel down the wall to the pad. Pitch aligns on the drawing with the press-frame ribs, keeping clearance intact. Sampling measures pitch and wall thickness only before the insert is bonded.

Outdoor two-way radio protective hard box olive closed shell on a steel shelf, two front catches, centre fold-down handle, scuffed surface and two straps, warehouse

Wall support and base clearance are logged apart; pitch is not converted into depth tolerance, and no single point stands for a whole row.

3. Transmitted acceleration readings across the sweep band

The sweep rig runs the Outdoor two-way radio protective hard box across 5–200 Hz, sampling the base accelerometer and the table reference together and taking transmitted acceleration as their amplitude ratio, with the full-band ceiling held to ≤4.5 g. Resonance peaks are logged alone rather than standing in for the band, and 40 kg/m³ curves are filed apart from off-density parts. Press-frame clearance is re-read before and after the sweep, on its own row from the amplitude ratio. An IP66 immersion check follows the sweep, never before it, using one mark set on the frame.

Readings of the Outdoor two-way radio protective hard box split by band: low frequency shows wall stiffness, high frequency shows pad isolation, and only the full-band row meets the ≤4.5 g limit.

Sweep band	Sampling	Reading use
5 Hz start	Point-by-point ratio	Low-frequency wall stiffness
200 Hz end	Mark resonance peak	High-frequency isolation
5–200 Hz full band	Take ratio ceiling	Compared with ≤4.5 g

4. Groove re-check after six-face drop

After a 1.2 m six-face drop, the Outdoor two-way radio protective hard box re-checks its grooves: 14 mm pitch, wall thickness and the continuous base layer are measured per unit with the same gauge as before. The verdict is that walls do not collapse; a collapsed edge sends the unit first to a 40 kg/m³ density check, then to a frame-clearance check, rather than straight to shell rejection. The two latches, each 350 N, are re-read before and after the drop and logged apart from wall movement. A 72 h salt spray is followed by one more wall check for peeling or cracks.

Outdoor two-way radio protective hard box green mould racks in a workshop, steel tooling on each shelf, a white inventory board in front and yellow

The Outdoor two-way radio protective hard box logs the six-face drop face by face; groove readings do not rerun the sweep, and re-check accepts only groove geometry and frame clearance.

5. Clearance verdict on the open-close life rig

After 4000 open-close cycles, the Outdoor two-way radio protective hard box is judged on latch clearance of ≤0.6 mm, read with a feeler gauge at the tongue and seat of both latches and taking the larger value. Excess clearance sends the unit first to a latch-seat insert check, then to a frame-clearance check for lid tilt, rather than to latch rejection. Cycling does not change the 12-groove layout and does not rerun the sweep.

The clearance verdict accepts feeler readings only; hand feel carries no weight.

Clearance value	Measuring point	Use
≤0.6 mm	Two latch tongues	Life-rig scrap line
350 N each	Latch closing force	Re-read before/after drop
Initial clearance	First article	Compared with 4000 cycles

Conclusion

The Outdoor two-way radio protective hard box links frame clearance, 14 mm pitch with wall support, ≤4.5 g transmitted acceleration over 5–200 Hz, no wall collapse after a 1.2 m six-face drop and ≤0.6 mm latch clearance after 4000 cycles into one shell-side specification chain, anchored at the frame, insert, sweep rig, drop re-check and life rig. JUNZHIJIA retains the 12 grooves, 40 kg/m³ EVA, 350 N latches, IP66 benchmark and 72 h salt spray by benchmark method, with sampling reusing the first-article datum. The file covers shell structure, insert process and inspection readings only, and stays with the case side of the design.