RpProto is dedicated to continuously improving and optimizing all custom manufacturing capabilities from prototype to production. In rapid prototyping and rapid tooling, each production step executes a quality control process to guarantee the delivery of high-quality parts to customers.
We fully adhere to the ISO 9001 quality management system. We use advanced testing equipment to measure and inspect to ensure that your project meets stringent quality specifications.
For complex prototypes with tight tolerances, precision measurements conducted by professionals are the only way to ensure perfection. Our highly trained inspection personnel use the most advanced digital equipment to ensure quality.
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Inspection & Quality Control
When you upload 3D CAD files to RpProto’s website, our engineering team performs a technical assessment of your parts design. We will carefully consider details like manufacturing process, material, finishing options and your quality needs. All this information will be documented well and instruct our manufacturing.
This design for manufacturability analysis is the first step in quality control in this pre-production stage. It helps to optimize part design, improve manufacturability, and avoid costly mould reworks.
RpProto adheres to the ISO9001:2015 standard.
Engineers regularly examine tolerances, quantities, and part complexity and adjust as needed.
It reduces production risks early on, saving money and time.
RpProto offers a complete inspection report if you request. It covers tolerances, key dimensions, the appearance of parts etc.
To ensure you receive perfect parts, we will package them well with paper or wooden boxes to reduce the damage during transportation.
Inspection Equipment
Making products with consistently high quality requires good process control techniques combined with advanced equipment.
RpProto has advanced inspection equipment to provide the best quality assurance services in the industry.
We can perform manufacturing quality control and ensure the parts we manufacture matches your design specifications.
We use the Coordinate Measuring Machine (CMM) for the dimensional inspection of the parts produced.
CMMs can measure the physical parts of an object by sensing and collecting points along its surface using a probe.
It is especially suitable for parts with complex geometries.
On completing the manufacturing process, we use an optical comparator/projector to inspect the dimension of the components.
This projector is ideal for the dimensional check as it precisely measures the part’s dimensions and compares them to the original CAD model.
Any inconsistencies detected by the projector are alerted in a detailed inspection report.
We employ X-Ray Fluorescence (XRF) analysis to check the material quality.
The XRF analyzer uses short X-rays and gamma rays to determine the elemental composition of metals, plastics and other materials to inspect the quality of the materials.
It is used for chemical analysis and enables you to do quality control, 
quantifications and verification of raw materials.
The Polymax Plastics Analyzer can identify all major families and subfamilies of plastics: 
Polyethylene (PE), Polystyrene, Nylon, Polyvinyl Chloride (PVC), Polycarbonate (PC) and Polypropylene.
PolyMax can even distinguish plastics that are very similar, including: HDPE vs. LDPE, Nylon 6 vs. Nylon 6.6, and ABS vs. SAN.
We use X-Rite spectrophotometer to capture and evaluate the color of your parts.
It is used to test metal semi-finished products and finished products,
as well as metal processing industry, pipes, bolts, bars, wires, plates, etc.
The Zeiss Comet L3D 2 optical scanner is ideal for checking parts for conformity, identifying manufacturing errors and reverse engineering. 
It capture and compute 3D data quickly and with a high degree of precision.
automatic video-based inspection and measurement
Manufacturing Standards & Tolerances
Tighter tolerance are examined on a case by case basis with your technical drawings.
Otherwise we will work to achieve and hold the tolerances listed below. It will vary depending on the manufacturing technique you choose.
RpProto provides high tolerance CNC machining processes for your diverse manufacturing requirements.
For features of orientation (parallelism and perpendicularity) and form (cylindrical, flatness, circularity, and straightness) apply tolerances as table below:
| Type | Tolerance |
|---|---|
| Linear dimension | +/- 0.025 mm |
| Hole diameters | +/- 0.025 mm |
| Shaft diameters | +/- 0.025 mm |
| Smallest thread size available | M1x0, 25 |
| Part size limit | 950 * 550 * 480 mm |
If no 3D drawing is provided, RpProto produces parts according to ISO 2768 M standard. Size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005” (metals) or +/- 0.010 (plastics and composites)
RpProto provides various injection molding services which includes rapid tooling, insert-molding, over-molding for your manufacturing needs. Each service is based on various manufacturing standards below:
| Part Size (mm) | Production Tooling | RapidTooling |
|---|---|---|
| 1~22 | ±0.06~0.09 | ±0.08~0.13 |
| 22~70 | ±0.11~0.17 | ±0.14~0.24 |
| 70~160 | ±0.20~0.29 | ±0.30~0.43 |
| 160~250 | ±0.36~0.44 | ±0.51~0.68 |
| 250~315 | ±0.44~0.55 | ±0.68~0.85 |
| 315~500 | ±0.70~0.90 | ±1.08~1.38 |
| 500~1000 | ±1.20~1.90 | ±1.83~2.90 |
Cores, side actions, tooling strategy, gating, ejection, knit lines and parting lines are determined by RpProto unless explicitly discussed.
Our sheet metal fabrication services includes laser cutting, bending, and other post-processing options.
| Dimension Detail | Tolerance |
|---|---|
| Forming and bending | +/- 0.020 |
| Bend to hole or feature | +/- 0.010 |
| Linear dimensions excluding locations to bends | +/- 0.005 |
| Diameters with inserts | +0.003 |
| Angularity | +/- 2 degrees |
Tolearance are +/- 0.010” or +/- 0.003” per inch, whichever is larger, is typical. Irregular or overly-thick geometries may cause deviances or deflection due to shrinkage.
A shrinkage rate of +0.15% can be expected due to thermal expansion of the liquid, and the response of the flexible mold.
Surface finish is externally smoothed to a satin or matte surface. Grow lines may be present on internal or difficult-to-access features. Polishing or custom finishes must be clearly defined and agreed upon at the point of order.
Sharp corners and text may appear slightly rounded.
RpProto provides you with the best technologies in 3D printing such as FDM, SLA, SLS, Polyjet.
| Process | Min. wall thickness | Layer height | Max. build size | Tolerance |
|---|---|---|---|---|
| SLA | 1.0 mm | 50 – 100 μm | 250 * 250 * 250 mm | ± 0.5% with a lower limit of ± 0.5 mm (± 0.020″) |
| SLS | 1.0 mm | 100 μm | 420 * 500 * 420 mm | ± 0.5% with a lower limit of ± 0.15 mm (± 0.006″) |
| FDM | 1.0 mm | 100 – 300 μm | 500 * 500 * 500 mm | ± 0.3% with a lower limit of ± 0.3 mm (± 0.012″) |
First Article Inspection
The first article inspection is available on request for low-volume injection moulding and CNC machining orders exceeding 6000 USD in the total price. RpProto will review the project and contacts the customer for detailed information.
We produce sample parts according to an agreement and deliver them to the customer.
The customer receives and examines the parts and informs RpProto if production may begin.
The production starts and finishes production within the lead time.
Rework & Refund Policy
RpProto aims to deliver high-quality parts that meet your requirements. However, if your order fails to meet your specifications, you will be covered by our Rework and Refund Policy.
Kindly contact us within five business days of receiving your order, and we will resolve the problem rapidly within 1-3 business days.
- Rework Conditions
- Unacceptable processing flaws
- Failure to reach the required tolerance
- inappropriate finishing
- Refund Conditions
- The part cannot be machined
- The consumer refuses to accept rework
- Other condition