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Engineering Case Notes

Engineering examples for manufacturing-route selection

Three notes are real-part reviews built from actual drawings or quotation records, anonymised at the customer's request. Three are illustrative engineering reviews. No achieved cost, yield or delivery result is claimed in any of them.

Each note starts from a different bottleneck and shows what has to be checked before a route is changed — geometry, material, density, tolerances, volume and validation.

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SINTS dimensional inspection and engineering review
Process Evaluation

Six examples, six different manufacturing questions

The point is not that MIM or PM always wins. Each example starts with a different bottleneck and shows what must be checked before changing the route.

0.4 g AISI 420 Blade: Heat Treatment & Edge

From a real quotation for a hardened blade: why a cryogenic step and a double temper sit behind HRC 48-52, and why the edge specification has to be measured after the polish, not before.

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17-4PH H1025 Part: Aging, Distortion & Magnetism

From a real quotation for a 1.2 g MIM structural part: what the aging condition decides, where distortion lands, and why 17-4PH is magnetic where 316L is not.

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304 Flanged Threaded Bushing: Real-Part PM Review

Based on an actual drawing at 73,560 pcs a year: why density at ≥7.0 g/cm³ decides whether the M18×1 thread can be rolled, and the three drawing callouts that moved the route and the price.

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17-4PH Lock Cam: CNC → MIM Evaluation

When complex profile, repeat volume and selective critical dimensions may justify moulding most features and finishing only what matters.

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316L Instrument Jaw: Geometry & Validation

How serrations, undercuts, surface condition and alignment requirements affect a MIM-versus-machining decision.

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Power-Tool Gear: PM & Sinter-Hardening Review

How density, tooth loading, hardness and secondary operations shape the shortest qualified production route.

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Decision Logic

When a conversion is worth modelling

Strong candidate

Repeat production, complex geometry, high machining content and a limited number of truly critical dimensions.

Worth modelling

The part has a mix of mouldable/sinterable features and a few surfaces that can be finished after sintering.

Poor candidate

Prototype or low volume, frequent design changes, large geometry, or a drawing dominated by tight tolerances everywhere.

Want us to evaluate your actual drawing?

We will compare process fit first. If machining remains the better route, we will say so.

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Component references

Connect the requirements to a real part

Browse product examples →Gears & transmission →Mechanism components →Send your drawing →

Frequently Asked Questions

Practical answers from the drawing review, not from a brochure.

Are these real production parts?

Each note is based on an actual quotation or production review, rewritten so that no customer, drawing number or price is identifiable. Dimensions, alloys and acceptance requirements are kept, because those are what the decision turned on.

Why do the notes include parts that were not converted?

Because a route decision is only credible if it can also say no. Several notes close with the conditions under which the part stays on CNC, and those conditions are the part a reader can apply to the next project.

How do I find a note close to my own part?

By the manufacturing question rather than the industry — a heat-treatment window, a density requirement, access to serrations, or a conversion away from machining. Each note states its question in the first paragraph.