What a Ginwate DFM review covers

Every quote comes with an engineer-written DFM review (free, 1-12 hour turnaround during China business hours). Below is a real sanitized example for a bracket-style part, showing the five categories of notes we typically include.

1. Feasibility flags

FAA / Feasibility: Feature 7 (Ø2 mm thru-hole, 28 mm deep) — depth-to-diameter ratio 14:1 exceeds standard drill capability. Recommend gun drill (adds $40 setup) OR split the hole into two intersecting features. Annotated on the drawing as red callout #1.

2. Tolerance optimization

TOL: Features 12, 14, 18 specified as ±0.005 mm. Of these, only 18 (bearing seat) appears functionally critical. 12 and 14 are clearance features — opening to ±0.05 mm reduces unit cost by ~$8 with no functional impact. Suggest revising to ISO 2768-m on those features.

3. Material substitution

MAT: Part specified as 7075-T6. Geometry suggests this is a structural bracket, not a high-strength interface. 6061-T6 reduces material cost by ~$0.40/pc and improves machinability (15-20% faster cycle). Confirm structural requirement before substitution. If 7075 is required for fatigue / strength, keep current spec.

4. Standard-feature recommendation

STD: M4 thread depth specified as 18 mm. Standard engagement = 1.5× diameter = 6 mm. Current depth wastes tap time and increases breakage risk. Recommend reducing to 8 mm thread depth + 12 mm clearance hole below if vertical envelope is critical. Saves ~30 sec/pc cycle time.

5. Surface finish efficiency

FIN: Drawing specifies "Ra 0.8 µm overall." Cosmetic surfaces (back face, side walls) don't require this finish — only the bearing-seat ID and mating face do. Per-feature callout saves bead-blast time + reduces masking complexity. Estimate: $1.20/pc savings.

How the DFM review actually arrives

You upload your CAD at our quote engine. The instant calculator gives a baseline price within seconds. Within 1-12 business hours, an engineer reviews the file and sends:

Updated quote with any cost-reducing changes called out
Annotated PDF of the drawing with red callouts at each issue
One-page summary email with the same five categories above

If you accept the recommendations, the production cycle uses the revised geometry. If you reject them (e.g. the tolerance is critical even though it looks loose), the original spec is honored with no pushback.

Why we run DFM review free

Catching a tolerance issue or material substitution before production saves both sides time. We'd rather spend 15 minutes on the front end than scrap a batch because a feature wasn't machinable as drawn. Sample CMM reports and material certs that come WITH the finished parts are on our sample reports page.

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