Is a case factory tour worth it for only 400 units?

Answer: Check the margin. At 400 units, 60 yuan and 12 percent, total margin is 2880 yuan, below the 4800 yuan trip, so video plus samples wins.

On a case factory tour, how do I spot a machine kept for show?

Answer: Three tells: the shot counter, the resin colour in the hopper, the sprues in the bin. If they disagree, that line rarely runs this product.

Can a third-party audit replace a case factory tour?

Answer: Not fully. An audit reads documents, a visit reads feel. One proves a procedure was written, the other proves it runs.

What price gap between a large and a small plant is fair?

Answer: On 1000 units of a 600 mm class, 8 to 15 percent is normal, buying 0.3 mm wall tolerance and stable delivery.

How soon after a visit should the order be placed?

Answer: Within 7 days, while notes are fresh; after a month the slot and the price both move.

Four Ways to Check a Supplier: What a Case Factory Tour Misses

Quick answer: A case factory tour proves machines and moulds are real, not that batches repeat. Under 500 units, video plus samples beats a flight.

What a factory visit can and cannot verify
Four ways to check a supplier: video, site visit, audit, samples
Which workshops to weight: moulding, hardware, assembly, testing
Press tonnage and order size: when a big plant is the wrong choice
When to skip the trip
Costing the trip: travel, downtime and samples
FAQ

1. What a factory visit can and cannot verify

A plant outside Dongguan runs its route in 40 minutes: past the resin store into moulding, a glance at assembly through glass, then 10 minutes at inspection. One expensive question gets answered fast: does the counterparty own a plant or a trading desk?

Three things survive scrutiny on a case factory tour: machines turning, moulds mounted, staff on the payroll. Lose one and the quote should fall 20 percent. What the aisle cannot show matters as much: wall drift between batches, the shots a mould has run, the purge record at a material change. All of it sits in the controller.

Item	On the floor	Off the floor	Ask instead
Machines	Tonnage plates	Uptime	Meter readings
Moulds	Cavity count	Shots run	Mould log
Consistency	First-off parts	Batch drift	Retained batches

2. Four ways to check a supplier: video, site visit, audit, samples

A video walk-through is the cheap stand-in for a case factory tour. In a 2-hour call, have the host walk past each press and read the plate aloud; exaggeration collapses. The lens still misses the reject bin and an idle press.

Case Factory Tour: a black wheeled case with its lid open, foam dividers holding microphones and coiled cables, two recessed wheels at the base

A site visit costs a day in transit and returns feel: lid damping, the heft of an empty case, gasket rebound, though only on a complex model.

An audit follows paper, reporting in 3 to 5 days on compliance and calibration. It proves a system exists, not why two cases feel different.

Samples are cheapest and slowest: 3 cases in 7 to 10 days for drop and rain tests. Performance is verified, volume stability is not.

Method	Time	Cost	Covers	Misses
Video	2 hours	0 yuan	Machines	Feel
Visit	1 day	4800 yuan	Mould, progress	Batch drift
Audit	3 to 5 days	6000 yuan	Calibration	Feel
Samples	7 to 10 days	1200 yuan	Performance	Capacity

Together they approach complete: video plus samples covers about 60 percent of the risk, an audit lifts that to 85, and the visit adds 15 that only pays above 2000 units.

3. Which workshops to weight: moulding, hardware, assembly, testing

Effective time on a case factory tour is 6 hours. Split four ways, that is 90 minutes each, and under 40 minutes are spent at a machine. Fix it in advance, or the host's route decides.

For a protective case the split runs 35 percent assembly, 30 percent testing, 20 percent moulding, 15 percent hardware. Assembly decides whether the case survives rain, testing whether the claim holds.

Workshop	Stand at	Pass line	Skip when
Assembly	Gasket station	25 to 30 percent	Flat gasket
Testing	Air decay rig	30 seconds, 0.3 kPa	Storage only
Moulding	First-off bench	0.3 mm wall	2 years of history
Hardware	Rivet line	45 mm pitch	No metal parts

At assembly, check whether the gasket is butt-welded into a loop and whether the joint sits mid-side. At testing, separate rain from immersion: 30 minutes of spray proves little, 30 minutes at 1 m depth proves the seal.

4. Press tonnage and order size: when a big plant is the wrong choice

Clamping force sets the size ceiling. A 250-tonne press suits cases under 400 mm, a 600 mm class needs 800 tonnes, a 1.2 m cavity needs 1600 tonnes. Reading the plate is the step to never skip.

Case Factory Tour: a black case open on a wooden bench, foam inside its lid, a divided foam tray beside wrenches, sockets and a hammer

Two rules at a large plant push small orders back: a mould change takes 4 hours or more, and runs under 600 units fit only into the gaps. The quote says 25 days, the board says 45.

Tonnage	Case size	Weakness	Avoid when
250 tonnes	Under 400 mm	Few cavities	1 m cavity
800 tonnes	600 mm class	0.3 mm drift	Under 300 units
1600 tonnes	1.2 m class	6-hour changes	20 days

Small plants fail at the other end: without in-line weighing, tolerance opens from 0.3 mm to 0.8 mm, and the drift hides until unit 300.

5. When to skip the trip

Standard stock comes first. When 300 units sit in the warehouse all year, the floor runs what you would inspect anyway.

A supplier with 2 years of clean history is second: marginal information is near zero, and an annual inspection spends better.

Third is arithmetic. Below 8 times the travel cost, a 500-unit order cannot carry a two-day trip.

6. Costing the trip: travel, downtime and samples

Two people, three days: 2200 yuan airfare, 1200 hotels, 600 transport, 800 meals, 4800 total, or 2.4 yuan per case on 2000 units.

Change one number and the answer flips. On 500 units at 60 yuan and 12 percent margin, total margin is 3600 yuan, or 1200 less than the trip.

The substitute package: 0 yuan for video, 1200 for three sample rounds, 800 for one inspection, 2000 total, close to 80 percent of a visit. The 2800 yuan saved buys 5 sealed first-batch cases.

Conclusion

Each method has a blind spot, and a case factory tour fills the one around feel and work in progress, not batch consistency. Big orders on complex models justify it; small ones at thin margin do not. Spend where the money can change the decision, the only trade-off a case factory tour defends.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.