Non-standard fixtures jigs and made-to-drawing parts · Yiwu China
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Precision machined components of the type used to build inspection jigs and gauges
Capability

Inspection Jigs

Jigs and check fixtures that turn a drawing tolerance into a decision an operator can make in seconds.

Start With A Drawing
Overview

What This Covers

An inspection jig answers one question: is this part acceptable. It does that by holding the part on its datums and presenting the feature being checked against a known reference, so the answer does not depend on who is holding the calipers. Hongpin builds these to customer drawings alongside the production fixtures that make the parts in the first place.

Process

From Your Drawing To A Working Tool

Each stage exists to move a decision earlier, where changing it is still cheap.

Identify what is actually being controlled

A jig that checks everything checks nothing quickly; the critical characteristics come first.

Establish the datum scheme

The jig must hold the part on the same datums the drawing uses, or it measures something else.

Decide go or measure

Some features need a go/no-go answer, others need a reading. The two lead to different jig designs.

Manufacture to the reference dimensions

The jig's own tolerances have to be a fraction of the tolerance being judged.

Correlate against known parts

Good and bad samples are run through the jig so everyone agrees it discriminates correctly.

Document and re-check

The jig ships with its drawing so it can be re-verified on a schedule you set.

Problems Solved

What This Fixes

  • Inspection takes longer than productionA dedicated jig turns a multi-dimension check into a single operation.
  • Two inspectors disagreeHandheld measurement of an awkward feature is operator-dependent; a jig removes the variable.
  • The jig measures the wrong thingHolding the part on convenient surfaces instead of drawing datums gives confident but wrong answers.
  • Nobody knows if the jig is still rightJigs wear like any other tool, and they need re-verification against a known reference.
Related Capability

Other Work Here

Lead times, certification and capacity figures are confirmed per project. The business never published them, so this site does not either.
Questions

Questions About Inspection Jigs

How accurate does the jig itself need to be?
As a working rule its own error should be a small fraction of the tolerance it judges. What fraction is acceptable is a decision to make together, because it drives the cost.
Can one jig check several variants of a part?
Often yes, using interchangeable locators. Whether that is a good idea depends on how often you change variants and how likely a wrong locator is to be fitted.
Go/no-go or a dial reading?
Go/no-go is faster and harder to get wrong. A reading tells you where in the tolerance band you are, which matters if you are tracking a drifting process.
Do you supply the jig with a calibration certificate?
Certification arrangements are confirmed per project. The jig is supplied with its drawing and reference dimensions so it can be verified to whatever regime you work to.
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Turned stainless steel precision bushing with a finished bore and chamfered ends
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Precision Bushing

A turned sleeve that carries a shaft, sets the running clearance and takes the wear instead of the housing.

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Ground stainless steel precision shaft with a smooth cylindrical running surface
Precision Turned Parts

Precision Shaft

A turned and finished shaft that runs in a bearing or a bushing and holds its diameter along the whole working length.

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Three stainless steel headed pins with long plain shanks and formed heads
Springs and Fasteners

Rivets and Dowel Pins

Headed pins and solid rivets turned to drawing, for joints that have to locate as well as fasten.

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Describe The Job And Send What You Have

A workpiece drawing and a description of the operation is enough to start. If the locating scheme is the hard part, that is worth working through before anything is cut.

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