Resources

3D concept illustration: a complete manufacturing enquiry preparation still life: silver sample component, plain blank drawing sheets, small material swatches and organized fasteners
  • Design Guides

RFQ Preparation Checklist for Custom Parts

1. Identify Every Part and Revision Include a part number, description, drawing revision and quantity for each item. Send a dimensioned PDF alongside a STEP or IGES model when available. A 3D…
3D concept illustration: a close-up digital caliper checking a machined aluminum bore beside a cylindrical plug gauge, no visible numbers or text
  • Design Guides

How to Define Tolerances and Inspection Requirements

Start with function. Mark the faces and features that locate, mate, seal, slide or support another component. Use datums that describe those relationships and can be reached during manufacturing and inspection. Distinguish…
3D concept illustration: an original silver CAD-like mechanical bracket next to a semi-transparent pale blue wireframe version of the same object, no screens or text
  • Design Guides

How to Prepare CAD Files for a Manufacturing Quote

Pair the model with a drawing. A STEP or IGES model communicates geometry. A dimensioned PDF communicates the revision, datums, tolerances, material, finish and requirements that may not be contained in the…
3D concept illustration: five matching aluminum finish sample plates with precisely different satin silver, black, blue, champagne and dark grey surfaces
  • Design Guides

How to Specify Anodized Color and Appearance

Separate color from texture. A color reference does not specify brushing, blasting, machining marks, gloss or allowable variation. Mark the visible faces and explain how adjacent parts will be viewed together. Use…
3D concept illustration: aluminum stock selection: short square extrusion, plate billet and round bar with a small finished bracket
  • Design Guides

How to Select an Aluminum Alloy

Start with the part form. A machined housing, a bent cover and an extruded rail can require different aluminum specifications. Choose the stock form and process before treating alloy numbers as alternatives.…
3D concept illustration: a generic silver mechanical component inside a translucent blue protective geometric cube, subtle abstract privacy metaphor, no padlock icons or text
  • FAQs

How should confidential information be shared?

Discuss confidentiality and any NDA requirements before sending sensitive drawings. You can begin with a non-sensitive description of the component, quantities and manufacturing needs, then agree how protected information should be shared.…
3D concept illustration: a generic engineering material sample and finished part alongside blank plain inspection sheets and a small gauge, absolutely no stamps, seals, certificates or logos
  • FAQs

Which certification or compliance requirements should I specify?

State the required standard, supplier qualification, material evidence and product tests with the enquiry. These are different kinds of evidence and cannot be substituted for one another. Distinguish the evidence A material…
3D concept illustration: four sequential manufacturing stages of one unique part: aluminum stock, cut profile, machined body and final assembled enclosure
  • FAQs

How are manufacturing responsibilities coordinated?

A custom-part project can involve selected production partners and several secondary operations. JUNCHU coordinates the drawing questions, process sequence, finished interfaces and agreed checks for the scope confirmed in the quotation. Confirm…
3D concept illustration: a small rough neutral clay-like prototype of a bracket next to its refined silver CAD product version, no written notes
  • FAQs

Can I enquire without a finished CAD model?

Yes. A sketch, photos, a reference-part description or a clear explanation of function can start the discussion. An initial enquiry helps identify what information is still needed; it is not a substitute…
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