Why is the load platform a separate 9 mm part instead of moulded with the shell?

A: Moulding with the shell lets rib shrinkage pull the datum face out of true. The Medical portable X-ray machine hard case makes the platform a separate stepped part, so one face can be measured before and after a sweep; only then is flatness of 0.6 mm or less comparable.

Why are all four pads 55 A with no mixing?

A: Mixing twists the platform into diagonal warp and spreads natural frequency, removing the basis for avoiding 18 Hz. One lot and piece-by-piece hardness checks fix the stiffness match.

Can the case be opened during the 3 h sweep?

A: No. Opening mid-run changes latch preload and pad compression, so the nine-point readings no longer line up. Flatness is taken only in the static remeasure after vibration.

What if platform flatness exceeds 0.6 mm after a 1.0 m drop?

A: Check first for lift between platform and recessed step, then for permanent pad set. Only after both are cleared may the case be reclamped; still over the line, it returns under the above-0.6 mm tier.

Is referencing IP65 part of the flatness verdict?

A: No. IP65 only references mouth sealing. The verdict reads the static value after a 5-200 Hz / 3 h sweep against the 0.6 mm line alone.

Medical portable X-ray machine hard case

Quick answer: Medical portable X-ray machine hard case pairs a 9 mm platform with 55 A corner pads, holding flatness to 0.6 mm after a 5-200 Hz / 3 h sweep.

Medical portable X-ray machine hard case load-platform thickness
Stiffness matching of the four corner damping pads
Flatness readings across the sweep band
Bench judgement for resonance avoidance
Platform scrap threshold for the portable batch
FAQ

1. Medical portable X-ray machine hard case load-platform thickness

The Medical portable X-ray machine hard case measures 590 x 410 x 240 mm outside, with a 520 x 345 x 170 mm cavity, a 4.3 mm shell wall and a separate 9 mm load platform. The platform seats on a recessed step over the base ribs, giving one datum face that can be measured before and after vibration, with its four corners locked by screws. JUNZHIJIA takes its top surface as the geometric reference for all flatness, gap and latch readings.

A thicker platform is not automatically better. The 9 mm tier matches a 6.1 kg empty case and a 13 kg loaded case; drop to 7 mm and corners sag after a sweep, while 11 mm eats the 170 mm cavity height. The Medical portable X-ray machine hard case writes 9 mm into the drawing tolerance band and checks each platform at three points.

A sealing lip closes the joint, with one gasket at 21% compression and 2 front latches each rated 365 N. Weak latch preload lets the lid chatter during a sweep and folds shell deformation into the platform reading. The Medical portable X-ray machine hard case tightens the two latches diagonally before the bench log starts.

2. Stiffness matching of the four corner damping pads

One damping pad sits under each corner, four in total at 55 A Shore hardness. Together with the 9 mm platform and the 13 kg load, that value keeps natural frequency clear of 18 Hz; mixing hardness values twists the platform into diagonal warp. The Medical portable X-ray machine hard case lists all four pads under one part number and one lot, rejecting anything more than 3 A off.

Medical portable X-ray machine hard case olive open shell, egg-crate lid foam with square label, silver sealed parts and cartons in base, racking behind

Stiffness matching also fixes pad travel. At 6.1 kg empty the pad compresses little, at 13 kg loaded it reaches its working range, and the height delta between the two must stay predictable. The Medical portable X-ray machine hard case logs both readings in one table and remeasures the delta after 4400 open-close cycles, sending a drifting pad back for a permanent-set check.

Keyed by platform thickness tier, the table below records corner sag and natural-frequency landing after a 5-200 Hz / 3 h sweep.

Platform thickness tier	Corner sag	Natural frequency
7 mm	0.9 mm	16.4 Hz
9 mm	0.2 mm	22.1 Hz
11 mm	0.1 mm	25.8 Hz

The 9 mm tier lands at 22.1 Hz, clear of 18 Hz, with corner sag of 0.2 mm inside the 0.6 mm flatness budget.

3. Flatness readings across the sweep band

The sweep runs from 5 Hz to 200 Hz over 3 h across the 5-200 Hz / 3 h band. The Medical portable X-ray machine hard case is not opened mid-run; at fixed points it samples nine platform heights, fits a datum plane by least squares, and takes the largest deviation as flatness. Verdicts come from a static remeasure after vibration: flatness of 0.6 mm or less is kept, and anything above returns to check platform and pad fit.

Low frequencies test pad travel, high frequencies test platform stiffness. Keyed by frequency band, the table below records peak flatness and the dominant site.

Frequency band	Peak flatness	Dominant site
5-20 Hz	0.34 mm	Corner pad compression
20-80 Hz	0.51 mm	Long-edge midspan
80-200 Hz	0.28 mm	Recessed step edge

The 80-200 Hz value falls back because the 9 mm platform stops following shell resonance at high frequency. The Medical portable X-ray machine hard case concentrates remeasurement on 20-80 Hz and keeps other bands as trend logs. Ambient temperature and clamp force are filed with the readings.

4. Bench judgement for resonance avoidance

Keeping natural frequency clear of 18 Hz is the hardest line here. A low-level sine sweep locates the resonance peak; if it lands within plus or minus 2 Hz of 18 Hz, pad hardness or platform thickness is adjusted before the formal 3 h sweep. The Medical portable X-ray machine hard case uses this as an entry gate, accepting one extra clamp rather than letting resonance pollute the flatness data.

Medical portable X-ray machine hard case white grid shelving holding olive, black and grey cases across several tiers, green carry case at top left

Two rechecks follow. Drop testing is 1.0 m on all six faces with flatness measured right after, and open-close runs 4400 cycles before latch force and gasket compression are remeasured. The Medical portable X-ray machine hard case requires flatness still at 0.6 mm or less, each latch at 365 N or more, and gasket compression near 21% before release. IP65 dust and spray conditions serve only as a mouth-sealing reference, kept out of flatness verdicts.

5. Platform scrap threshold for the portable batch

The batch closes on the flatness value; the table below gives the three dispositions.

Flatness value	Bench verdict	Batch action
0.4 mm or less	Ample margin	Release directly
0.4-0.6 mm	On the line	Add one sweep
above 0.6 mm	Over budget	Return for platform and pad check

A 0.4-0.6 mm unit takes one more 5-200 Hz / 3 h run, and both readings must sit on the line before release.

The 0.6 mm scrap line absorbs 9 mm machining spread, 55 A hardness scatter and residual deformation after 3 h sweeping. JUNZHIJIA works to one drawing tolerance band, with the bench method written as reproducible steps.

Conclusion

The Medical portable X-ray machine hard case ties a 9 mm load platform, 55 A corner pads and a 5-200 Hz / 3 h sweep into one reproducible reading chain, closing on flatness of 0.6 mm or less and natural frequency clear of 18 Hz. The 590 x 410 x 240 mm outside, 4.3 mm wall, 2 latches and one gasket keep shell deformation out of the readings. JUNZHIJIA draws to one shared tolerance band, so one lot reads like the next.