Which checks on a Mobile Tool Cabinet must never be sampled?

Answer: Size, door gap and lock engagement. They decide whether a unit assembles and locks, and none can be fixed later.

Can appearance be written as no obvious defects?

Answer: No. Scratch length, dent depth and colour spread must be numbered, or two inspectors judge one cabinet differently.

How long should a Mobile Tool Cabinet load test run?

Answer: 1.5 times the rating for 12 hours, then an hour unloaded before reading residual. Creep needs time.

How many units make a fair sample?

Answer: Take it from the lot table, 13 of 51 to 90. Stratifying by station matters more than the count.

What happens to a lot that fails?

Answer: Class A returns the whole lot. Class B may be sorted and repaired, then retested with the sample doubled. ---

Mobile Tool Cabinet Acceptance: Items, Tests, Limits

Quick answer: A Mobile Tool Cabinet acceptance standard settles four things: how checks are grouped, how each is measured, where limits sit, and how a lot is sampled. Aligned, two inspectors reach one verdict.

How the Inspection Items of a Mobile Tool Cabinet Group Up
Appearance and Welds: What Must Be Measured
Dimensions and Geometry: Full or Sampled
Load and Travel Tests: What Makes Them Count
Acceptance Limits and Sampling Rules
FAQ

1. How the Inspection Items of a Mobile Tool Cabinet Group Up

The hard part of an acceptance standard is grouping, not limits. Put twenty checks in one table and the floor will do the easy ones and write pass beside the rest.

Six groups cover a Mobile Tool Cabinet: appearance, welds, dimensions, coating, load and travel. The first four are static, the last two only mean something in motion, and welds come before coating.

Every group needs a record line. Disputes are rarely about pass or fail; they are about what was measured, with which gauge, by whom.

Group	Items	Method	Stage
Appearance	scratches, dents, colour	visual and feeler	before coating
Welds	leg, undercut, porosity	weld gauge	before coating
Dimensions	size, door gap, lock engagement	tape and rule	after assembly
Coating	thickness, adhesion	gauge and cross-cut	after coating

2. Appearance and Welds: What Must Be Measured

Appearance is the group most often written as no obvious defects, and the one that causes most arguments. A Mobile Tool Cabinet needs three judgeable lines: scratch length, dent depth and colour spread. A 30 mm scratch fails, so does a 0.6 mm dent.

Mobile Tool Cabinet: a dark grey corner in close-up, an orange clasp over the lid edge and an orange seam line across the body

Welds are measured three ways: leg, undercut, porosity. Leg follows the drawing, typically 4 mm; undercut stays under 0.4 mm; porosity above 1 mm counts twice per metre at most. Eyes catch only undercut; a gauge is needed.

Distortion is usually skipped. Thin sheet warps and the door stops closing. A one metre straightedge on the frame should show no gap over 2 mm; a seal cannot pull it shut.

3. Dimensions and Geometry: Full or Sampled

Dimension checks divide into full and sampled. Size, door gap and lock engagement go on every unit because they decide assembly and locking; diagonal and flatness are sampled as drift indicators.

Give door gap as a range, not a value. Two to three millimetres is normal, with no more than 0.6 mm difference along one gap; more is a twisted door. Lock engagement under 6 mm can release on impact.

Sample across stations. Ten units from one bench sampled in sequence is one unit, so stratify and inspect fully below three stations.

4. Load and Travel Tests: What Makes Them Count

A load test that only shows nothing collapsed proves nothing. Load to 1.5 times the rating, spread evenly, hold 12 hours, unload an hour, then read residual: shelf set under 1.2 mm, diagonal under 1 mm.

Mobile Tool Cabinet: a closed orange case on a workbench, one square latch on the front edge, wrenches on a pegboard behind

Travel testing needs a route and a count, or two laps pass. Fully loaded, 20 m out and back 50 times, then a 10 mm threshold three times, checking casters, axles and torque loss over 15 percent.

Torque needs a reading and a re-read. M8 bolts at 22 to 26 Nm, M6 at 10 to 12 Nm, re-checked after the run, anything below 85 percent retightened.

5. Acceptance Limits and Sampling Rules

A decision rule states three things: how defects are classed, how each is accepted, who may reject. Class A injures or disables, such as a cracked caster; class B can be repaired; class C is cosmetic.

Sample by lot size from a table, not a flat percentage. A Class A defect sits outside sampling: one unit returns the lot, and that call is not the inspector's.

Lot size	Sample	Accept	Reject
9 to 15	3	0	1
16 to 50	8	1	2
51 to 90	13	1	2
91 to 150	20	2	3

Records run 24 months and every unit carries a number matching its plate, so a lot problem leads to batch and station.

Conclusion

A standard is not a set of limits tightened for its own sake; it is four things in line: items, method, limit and verdict. Grouping makes checks runnable, numbers end arguments, records lead to a station. A Mobile Tool Cabinet standard two inspectors can execute alike is worth issuing.

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.