Shock-Mount Flight Cases: When You Actually Need Them

pA camera rental house in Sydney sent 5 cinema cameras in a standard flight case—no shock mounting. The truck hit a pothole at 60 mph. The cameras shifted in the foam. One camera’s sensor was damaged by a 5g impact through the rigid foam. Repair: $3,200 per camera, and the rental house lost 4 weeks of rental revenue. The case itself was fine. The problem: rigid foam transmits shock directly to the equipment. Shock mounting solves this—but it adds cost, weight, and size. This guide explains when you actually need it, how it works, and what isolators to specify.

How Shock Mounting Works

pStandard flight cases use rigid foam: the equipment sits in a CNC-cut cavity, and the foam holds it in place. This works for most gear, but it has a limit: the foam transmits shock directly to the equipment.

How rigid foam transmits shock:
– A drop or pothole creates a G-force spike.
– The foam compresses slightly (2-5mm).
– The equipment accelerates with the case wall.
– The G-force transfers directly through the foam.
– Result: fragile internal components see the full shock.

Shock mounting solves this:
– The equipment sits on spring-like isolators inside the case.
– The isolators compress and extend, absorbing the G-force.
– The equipment sees 1/5 to 1/10 of the actual G-force.
– Result: fragile components survive impacts that would otherwise damage them.

The physics:
– A standard case: equipment sees 100% of the G-force (rigid mount).
– A shock-mounted case: equipment sees 10-20% of the G-force.
– A 50g drop through rigid foam: equipment sees 50g.
– A 50g drop through shock mounts: equipment sees 5-10g.
– Most electronics are rated to 15-25g operational, 50g non-operational.
– Shock mounting keeps you under the equipment’s rating.

What the isolators look like:
– Rubber bobbin mounts (cylindrical, rubber in metal housing).
– Sandwich mounts (conical rubber between two metal plates).
– Wire rope isolators (steel cables coiled around equipment frame).
– Each type has a natural frequency rating (how soft it is).

What’s inside a shock-mounted case:
– Outer case: standard flight case (aluminum, plywood, steel corners).
– Inner tray: a rigid tray (aluminum or plywood) that holds the equipment.
– Isolators: 4-8 mounts between the tray and the outer case.
– The tray floats on the isolators.
– Cable exits: flexible cable pass-throughs (not rigid) on the back.

The trade-off:
– Shock mounting adds $80-200 per case.
– Adds 2-4kg weight per case.
– Adds 20-30mm to each dimension (for isolator travel).
– Reduces interior space by ~15%.
– But it protects equipment worth $5,000-$50,000+.

When it’s worth it:
– Equipment over $5,000: yes, shock mount.
– Equipment under $1,000: probably not, rigid foam is fine.
– Medical/lab equipment: yes, shock mount required.
– Cameras/lenses: yes, shock mount recommended.
– Audio mixers/amps: usually not, rigid foam is fine.

Types of Shock Mounting Systems

pThree types of isolators used in flight cases:

1. Rubber bobbin mounts (most common)
– Cylindrical rubber core inside a metal housing.
– Compresses vertically and horizontally.
– Natural frequency: 8-15 Hz.
– Load range: 5-50 kg per mount.
– Cost: $3-8 per mount.
– Used for: cameras, monitors, small equipment.

How they work:
– The inner tray bolts to the center of the bobbin.
– The outer case bolts to the outer housing.
– Rubber between them compresses under shock.
– The natural frequency (10 Hz) is below most road vibration (20-50 Hz).
– Isolation at 20 Hz: 60-70%.

Pros and cons:
– Pros: cheap, compact, proven.
– Cons: degrades over 5-7 years (hardens in heat).
– Replacement: $5-10 per mount, 30 minutes per case.

2. Wire rope isolators (premium)
– Steel cables coiled around an aluminum center.
– Absorbs shock in all 6 directions (3 axes + rotation).
– Natural frequency: 5-10 Hz.
– Load range: 10-100 kg per isolator.
– Cost: $20-40 per isolator.
– Used for: military, aerospace, high-value equipment.

How they work:
– The cables bend under load.
– Energy is dissipated through cable friction.
– No rubber to degrade.
– Lasts 15-20 years.

Pros and cons:
– Pros: best isolation, no degradation, all-direction.
– Cons: expensive, larger, heavier.
– Used when: equipment over $20,000, military specs.

3. Conical sandwich mounts (mid-range)
– Conical rubber between two steel plates.
– Compresses vertically, spreads horizontally.
– Natural frequency: 10-18 Hz.
– Load range: 10-80 kg per mount.
– Cost: $8-15 per mount.
– Used for: larger equipment, server racks.

Pros and cons:
– Pros: better than bobbins, cheaper than wire rope.
– Cons: less horizontal isolation.
– Good middle ground.

Comparison table:
| Isolator type | Natural freq. | Load per unit | Cost/unit | Lifespan | Best for |
|—|—|—|—|—|—|
| Rubber bobbin | 8-15 Hz | 5-50 kg | $3-8 | 5-7 years | Cameras, monitors |
| Conical sandwich | 10-18 Hz | 10-80 kg | $8-15 | 7-10 years | Racks, larger gear |
| Wire rope | 5-10 Hz | 10-100 kg | $20-40 | 15-20 years | High-value, military |

How many isolators?
– Small case (10-20 kg): 4 bobbin mounts.
– Medium case (20-40 kg): 6 mounts (4 corners + 2 sides).
– Large case (40-80 kg): 8 mounts (4 corners + 4 sides).
– Each mount carries the load/number_of_mounts.
– The isolator rating must exceed the actual load per mount.

When Shock Mounting Is Necessary

pNot every case needs shock mounting. Here’s the decision:

Get shock mounting when:

1. Equipment over $5,000
– A $10,000 camera needs $150 shock mounts.
– The mounts are 1.5% of the equipment value.
– A single damage event costs more than the mounts.

2. Fragile internal components
– HDD/SSD (shock-sensitive).
– Optical drives.
– Glass displays.
– Lens elements.
– These fail at 20-30g. Shock mounting keeps you under 15g.

3. Air cargo or rough transport
– Air cargo: 50g drops onto concrete.
– Truck potholes: 20-30g spikes.
– Railway: continuous vibration at 10-20 Hz.
– Shock mounting handles all of these.

4. Medical or laboratory equipment
– Calibrated instruments: shock changes calibration.
– Medical devices: shock affects function.
– Often required by the equipment manufacturer.

5. Rental fleets
– Rental equipment sees rough handling.
– Shock mounting reduces damage claims.
– Rental companies save money on repairs.

Skip shock mounting when:

1. Equipment under $1,000
– A $500 microphone doesn’t need $150 mounts.
– Rigid foam is fine.

2. Ruggedized equipment
– Equipment already built to MIL-STD.
– It survives 50g without mounts.

3. Light use (studio to car to venue)
– No rough handling.
– Rigid foam is adequate.

4. Budget constraints
– Shock mounting adds 30-50% to case cost.
– If you can’t afford it, get better rigid foam (EVA instead of PE).

Decision framework:
| Equipment | Value | Fragile? | Transport | Recommendation |
|—|—|—|—|—|
| Cinema camera | $15K | Yes | Air cargo | Shock mount (wire rope) |
| Audio mixer | $3K | Moderate | Truck | Rigid foam (EVA) |
| Speaker | $800 | No | Truck | Rigid foam |
| HDD recorder | $2K | Yes | Air cargo | Shock mount (bobbins) |
| LED wall panel | $5K | Moderate | Truck | Rigid foam + EVA |
| Server rack | $10K | Yes | Truck | Shock mount (sandwich) |

What rental companies say:
– “We put shock mounts on all cameras. Saved us $20K in repairs in year 1.”
– “We tried rigid foam on HDD recorders. 3 failed in 6 months. Switched to shock mounts.”
– “Speakers and amps don’t need it. We save money there.”

The rule: shock mount what breaks. Don’t shock mount what survives.

Choosing the Right Isolator Rating

pSpecifying the wrong isolator is as bad as not having them. Here’s how to choose:

Step 1: Know your equipment weight
– Weigh the equipment (with accessories).
– This determines how many isolators you need.

Step 2: Calculate load per isolator
– Total weight ÷ number of isolators = load per isolator.
– Example: 30kg case, 6 isolators = 5kg per isolator.
– Choose isolators rated for 5kg (or higher).

Step 3: Know the equipment’s shock rating
– Check the manufacturer’s spec sheet.
– Operational shock rating (operating): usually 15-25g.
– Non-operational shock rating (non-operating): usually 50-100g.
– You want the case to keep the equipment under the operational rating.

Step 4: Estimate the transport shock
– Road transport: 10-25g (potholes, bumps).
– Air cargo: 40-50g (drops).
– Railway: continuous vibration at 10-20 Hz.
– You want the isolator to reduce this to under 15g.

Step 5: Choose the natural frequency
– Natural frequency should be 1/3 to 1/5 of the transport vibration frequency.
– If transport vibration is 20 Hz, choose isolators with 5-8 Hz natural frequency.
– Lower natural frequency = better isolation = softer ride.
– But too soft: the equipment floats too much (cable stress).

What to ask the supplier:
1. “What isolator type?” (bobbins, sandwich, wire rope)
2. “What’s the natural frequency?” (Hz)
3. “What’s the load per isolator?” (kg)
4. “How many isolators?” (4, 6, or 8)
5. “What’s the isolation efficiency at 20 Hz?” (should be 60-80%)

What the supplier should tell you:
– “We use 6 rubber bobbin isolators, rated 10kg each, natural frequency 10 Hz.”
– “Isolation efficiency at 20 Hz: 70%.”
– “Your 30kg camera sees 7.5g from a 25g road impact.”

How to verify:
– Ask for the isolator spec sheet.
– Check the natural frequency rating.
– Check the load rating.
– A professional supplier provides this documentation.

Common mistakes:
– Too many isolators (over-engineering): wastes money.
– Too few isolators (under-engineering): each carries too much load.
– Wrong natural frequency: too stiff (no isolation) or too soft (floating).
– Wrong load rating: isolators bottom out (no isolation).

What we specify:
– For cameras: 6 wire rope isolators, 8 Hz natural frequency.
– For mixers: 6 rubber bobbins, 12 Hz natural frequency.
– For speakers: rigid foam (no isolators needed).
– For HDD recorders: 4 rubber bobbins, 10 Hz natural frequency.

The isolator rating is as important as the case itself. Get it wrong and the shock mounting doesn’t work.

Ready to Protect Your Valuable Equipment?

ROBUST CASE specializes in custom flight cases engineered and produced in Changzhou’s aluminum case manufacturing cluster. OEM/ODM partner with our partner factories operating under ISO 9001 quality systems. We build shock-mounted cases with rubber bobbin, conical sandwich, or wire rope isolators. We calculate the correct isolator rating based on your equipment weight and shock sensitivity. Every shock-mounted case includes flexible cable pass-throughs and an inner tray that floats on the isolators. MOQ: 10 cases for custom, 1 case for stock.

Send us your equipment list with weights and shock sensitivity. We’ll calculate the right isolator type, count, and rating for each case. For cameras and HDD recorders, we recommend wire rope or bobbin isolators. For speakers and amps, rigid EVA foam is sufficient. We provide isolator spec sheets with every quote. Lead time: 25-30 days.

Request a Free Quote → https://coral-chamois-286436.hostingersite.com/get-a-quote/

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