When buyers contact a stamping factory about custom sheet metal stamping parts, the first question is almost always about the reference: "I have a sample, can you make it?" or "I have drawings, can you quote it?" The short answer is that a professional stamping manufacturer can work from either one. But each route has its own requirements, timelines, and cost implications. This article explains both paths in detail, so you know exactly what to prepare and what to expect before you send your first inquiry.

Two ways to start a custom stamping project

Every custom sheet metal stamping project begins with one of two references: a drawing or a physical sample. Some buyers hold complete engineering documentation; others have only a worn, discontinued, or locally made part in their hands. Both are valid starting points. A full-service factory like DIAN STAMPING, which has been manufacturing automotive stamping dies and stamped parts since 2003, has built its workflow to handle both routes without compromising quality.

The choice between them usually comes down to what you already have. If your design is new and fully defined, a drawing is the natural starting point. If you are replacing a part whose original supplier no longer exists, or whose drawings were lost years ago, a sample is often the only reference you have. Understanding the strengths of each will help you get a faster, more accurate quotation.

Starting from a drawing: precision from the first step

If you have engineering data, this is the most straightforward route. The factory can review your design, run a design-for-manufacturability (DFM) analysis, and move directly into tooling design. To get an accurate quotation and a smooth project, prepare the following:

• 2D drawings in PDF or DWG format, with dimensions and tolerances clearly marked
• A 3D model in STEP, IGES, or a native CAD format if available
• Material grade and thickness (for example, cold-rolled steel, aluminum, or stainless steel)
• Surface finish or coating requirements
• Estimated annual quantity and target delivery date

The advantages of this route are clear. The specification is defined from the start, so there is little ambiguity about what will be produced. DFM feedback can be given immediately, often before any tooling is cut. Tolerances are agreed in advance, which shortens the sample approval cycle. For new vehicle programs and precision components, starting from a drawing is almost always the fastest path to production.

Starting from a sample: reverse engineering done right

When drawings are missing, a physical sample is enough to get a project moving. The factory measures the part, captures its geometry, identifies the material, and rebuilds a 3D model and a controlled production drawing. You approve this data before any tooling is cut. This is more involved than copying visible dimensions, because a used part may be worn, bent, corroded, or coated. The engineering team has to separate design intent from years of service before deciding what to measure and what to reconstruct.

Sample-based manufacturing makes the most sense in these situations:

• Discontinued spare parts that the original OEM no longer supplies
• Legacy equipment whose drawings were lost during ownership changes or relocation
• Worn or damaged components such as brackets, hinges, panels, or structural parts
• Supplier localization, when you want a second source closer to your assembly plant
• Product improvement, when the existing part needs better material, strength, or finish
• Prototype development, when a handmade sample must become a repeatable production part

If you are sending a sample, include as much context as possible. Clear photos with a ruler for scale, approximate dimensions and weight, the required quantity, the application and service conditions, any known material grade, and a description of how the part failed or wears. If you have two samples, send both, and include a mating component if fits or alignment are critical. This information lets the factory respond faster and reduces the risk of misunderstanding.

Sample or drawing: which should you use?

There is no single right answer, because the best reference depends on your situation. The table below compares the two routes across the factors that matter most.

In practice, many projects combine both. A buyer might send a sample together with a partial drawing, or provide a 3D model that still needs material confirmation. The factory should be flexible enough to use whatever reference you have and fill in the gaps with engineering judgment.

The DIAN STAMPING workflow: from reference to delivery

DIAN STAMPING is a factory rather than a trading company, which means the same team that quotes your project also designs the tooling, runs the presses, and inspects the parts. The company operates a modern facility of roughly 50,000 square meters with around 110 employees, including about 35 die designers and technicians. Its annual capacity is around 2,000 sets of medium and small stamping die sets, and it supplies OEM customers including KIA, BYD, Toyota, Honda, Suzuki, and Geely, exporting to more than 10 countries.

Whichever reference you start from, the project follows a clear sequence:

1. Inquiry and feasibility review, using your drawing or sample
2. DFM analysis for drawings, or reverse engineering for samples
3. Tooling design and build, including progressive, transfer, and tandem dies
4. First-article samples and your approval before mass production
5. Production on the press line, with secondary operations such as laser trimming, hemming, flanging, and spot welding
6. Quality inspection using checking fixtures and CMM measurement to confirm dimensions
7. Welding and assembly with custom welding jigs where the part is part of a larger assembly
8. Packaging and delivery according to your schedule

The factory works with a wide range of materials, including multiphase steel, aluminum, custom rolled and welded plate, and stainless steel. Typical delivery is 30 to 40 days for steel stamping dies and about 70 days for casting stamping dies, depending on the project. Prototype services are available, and free metal samples may be offered with freight paid by the customer.

What to prepare before contacting a factory

You do not need a complete engineering package to start. The following information helps any stamping manufacturer respond faster and quote more accurately:

• A drawing, a 3D model, or clear photos of the sample with a scale reference
• Approximate dimensions, material, and thickness if known
• Required quantity for prototypes and estimated annual demand
• The application and any special service conditions, such as heat or corrosion exposure
• Required surface finish, coating, or heat treatment
• Target delivery date and destination country

If confidentiality matters, request a non-disclosure agreement before sending a physical part or detailed photographs. Most factories are happy to sign one before the project begins.

Common mistakes to avoid

• Quoting from a single photograph, which hides critical geometry and interfaces
• Copying worn dimensions from a used sample instead of reconstructing the original function
• Choosing material by appearance alone, since similar-looking alloys behave very differently
• Skipping first-article approval, which turns a small assumption into a batch-wide problem
• Specifying unnecessarily tight tolerances that raise cost without improving function
• Failing to create controlled documentation, so every repeat order becomes a guessing exercise

Frequently asked questions

Can you make custom sheet metal stamping parts from a sample without drawings? Yes. The factory measures the sample, rebuilds a 3D model and production drawing, and asks for your approval before cutting tooling. Photos alone are useful for an initial review, but accurate production normally requires the physical sample or reliable dimensions.

Do I need to know the exact material? No, but you should describe the application and service conditions. Material analysis and engineering review can identify a suitable grade, taking corrosion, temperature, strength, and cost into account.

Will I receive a drawing of my part? Yes. A controlled drawing and, where agreed, a 3D model are created before production. Ownership and file-delivery terms should be clarified in the quotation.

What are typical lead times? For steel stamping dies, delivery is typically 30 to 40 days; for casting stamping dies, about 70 days. Production time and shipping are added on top, depending on the project.

What quantities are possible? DIAN STAMPING supports both prototype and high-volume production. The factory runs progressive, transfer, and tandem dies that are well suited to large annual volumes, while prototype services cover low-quantity development runs.

Start with what you already have

A missing drawing does not have to stop a project, and a complete drawing does not need to be perfect before you reach out. Whether you hold a full set of CAD files or a single worn sample, a capable stamping factory can take it from there. The key is to provide as much context as possible, approve the engineering data before tooling begins, and validate a first article before committing to full production.

DIAN STAMPING accepts custom projects from 2D drawings, 3D data, or physical samples, and supports them with in-house die design, stamping, checking fixtures, welding jigs, and assembly. If you are sourcing custom sheet metal stamping parts and are unsure which reference to provide, send what you have and ask for a feasibility review. The factory will tell you what it needs and recommend the most practical route to production.