Why This Situation Is Different From a Standard Manufacturing Inquiry
When you have a drawing, evaluating a manufacturer is mostly about price, tolerance capability, lead time, and certifications. When you don’t have a drawing — because the part is discontinued, the original supplier is gone, or there was never documentation to begin with — the evaluation changes completely.
Most online quote platforms will ask you to upload a CAD file. When you can’t, they stop. You need a manufacturer that does reverse engineering and part reproduction as a core service, not one that added “we can sometimes work from samples” as a footnote. The checklist below separates those two types.
The 7-Point Checklist Before You Send Samples to Anyone
Do they explicitly accept physical samples — not just files?
Look for “from sample”, “no drawing”, or “send the part” on their service pages. If their homepage leads with “upload your CAD”, they are a quote-automation platform, not a reproduction specialist.
What measurement equipment do they use?
Ask specifically: CMM, 3D scanner, or manual callipers? CMM or scanning is appropriate for machined parts with geometric tolerances. “We’ll measure by hand” is acceptable for simple turned parts; it is not appropriate for anything with tight fits or complex profiles.
What is their minimum order quantity for one-off reproduction?
An MOQ of 50 or 100 means they are a production shop selling to catalogue buyers. A reproduction specialist accepts MOQ 1 — that is the defining characteristic. Confirm explicitly; do not assume.
Do they sign NDAs before receiving samples?
Your part geometry is proprietary. A shop that measures your part, builds a CAD model and then declines to sign an NDA has effectively captured your design. Any serious reproduction shop has a standard NDA and will sign it without negotiation.
Do you receive a drawing for approval before machining starts?
Critical fits — bore diameters, thread specifications, keyway sizes, mating surface tolerances — should be confirmed with you before metal is cut. A shop that skips this step is betting that their interpretation matches what the machine needs. That bet loses enough times to matter.
Can they provide First Article Inspection?
First Article Inspection (FAI) is a dimensional check of the first machined piece against the approved drawing. It catches errors before a batch is run. For one-off jobs it is standard practice. Ask if they offer it and whether you will receive the report.
Who owns the CAD file at the end?
The CAD built from your sample was paid for by you — it should belong to you. Some shops treat the CAD as their own asset and use it to make re-ordering through anyone else difficult. Ask explicitly: “Do I receive the STEP file and am I free to use it with other suppliers?”
What to Prepare Before You Contact Anyone
The quality of the information you send determines the quality of the quote you receive. Prepare these before reaching out:
- The part itself — worn, broken, partial, or corroded is fine. Ship it in a padded bag.
- Photos from all angles — minimum four views (top, bottom, two sides). Include one known dimension in frame (a ruler, a coin, or a caliper reading on a sticky note next to the part).
- Machine make, model and year (if known) — not required, but helps engineers understand the load environment and mating parts.
- Quantity — one-off, a small stock of spares, or ongoing supply. The answer affects how the job is priced.
- Material clue if any — what do mating parts suggest? Is it magnetic? Does it spark? Any markings on the original?
- Application context — operating temperature, chemical exposure, load type (static, rotating, impact). Only needed for unusual applications; most industrial parts are straightforward.
You do not need a part number, a drawing, or OEM documentation to get a quote. The part is the documentation.
4 Red Flags When Evaluating Quotes
“We will need a drawing before we can quote.”
A reproduction specialist does not need a drawing — producing the drawing is part of what they do. This response means they are a build-to-print shop, not a sample-based reproduction shop.
Quote returned within 2 hours of sending photos.
Measuring a part from photos, identifying material, assessing tolerances and building a legitimate estimate takes time. A quote that comes back in under two hours of photo submission either skipped the engineering review or is a placeholder number that will change once they see the actual part.
Price seems suspiciously low for a one-off.
One-off machining has real setup costs. A price that seems too good for a single complex part should prompt questions: what tolerance are they holding, what material are they using, is there a hidden re-inspection charge if the first article fails?
No NDA offered and no clarity on CAD ownership.
If a supplier does not raise the NDA question themselves and dodges the CAD ownership question, assume the geometry stays with them. For a part you may need to re-order for years, that matters.
Repair vs. Source OEM vs. Reproduce — When Each Route Makes Sense
| Route | Best when | The limitation |
|---|---|---|
| Repair the original | Damage is localised (worn bore, cracked boss) and the base part is sound | Buys time once; the repaired area is usually the first to fail again |
| Source OEM or surplus stock | Recently discontinued, stock still exists, pricing is reasonable | Stock depletes; this option disappears as machines age |
| Aftermarket equivalent | Standardised part with known dimensions (bearings, seals, standard fasteners) | Only works when an interchangeable equivalent exists in the market |
| Custom reproduction (send sample) | Part is gone from market, or you want material upgrade, or you need MOQ 1 | First-off cost is higher than catalogue price; spares in same run cut unit cost sharply |
Most customers who reach us have already tried the first three routes. Custom reproduction ends the search rather than delaying it — once the CAD exists, re-orders are fast and the part is never unavailable again.
When the machine is down now: say so explicitly in your first message. Shops that do reproduction work can often compress the schedule for genuine downtime situations — but only if you tell them upfront. See our broken part reproduction page for jobs where schedule is the primary constraint.
What to Write in Your First Message
Copy this as a starting template. Fill in what you know; leave blank what you don’t. A partial brief is better than no brief:
Part: [describe the part — what it does, what machine it belongs to]Condition sent: [worn / broken / corroded / good condition sample]Quantity needed: [1 piece / 3 pieces / ongoing supply — rough frequency]Material (if known): [cast iron / steel / stainless / aluminium / unknown]Special requirements: [anything about the operating environment, mating tolerances, or finish]Timeline: [machine down now / within 2 weeks / flexible]Photos: [attached]
Send this with the photos (or the physical part) to [email protected]. We respond within 24 hours with questions or a preliminary quote.
Frequently Asked Questions
Photos from multiple angles with one known reference dimension are usually enough to quote. Accuracy depends on how clearly the geometry can be resolved from photos, so for complex profiles we may ask for clarifying angles or measurements. For parts where fit tolerance is critical, sending the physical part is always better than photos alone.
At EKINSUN, yes — the CAD built from your sample belongs to you. Confirm this with any supplier before engaging. Some shops treat the CAD as their asset and use it to lock in repeat orders. Ask explicitly: who owns the STEP file at the end of the job?
A serious reproduction shop will issue a drawing for your approval before machining. Critical fits are called out and confirmed with you. The first article is then inspected against those dimensions. If anything is wrong, it is corrected before a batch is cut.
Yes, and it is often worth considering. Cast iron can be reproduced in ductile iron or steel billet. Mild steel shafts can be upgraded to 4140 or 316 stainless. Better material costs more upfront but extends part life — so the lifetime cost is usually lower. We flag upgrade options in every quote.
A single reproduced part typically costs more than the original catalogue price — one-off machining carries full setup. But ordering 2–3 spares in the same run cuts unit cost significantly. The meaningful comparison is against machine downtime and the cost of a full machine replacement, not the old catalogue line.
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