Manufacturing Standards
| Part size | Tolerance | Angularity |
|---|---|---|
| < 300 mm (12″) | ± 0.125 mm (± 0.005″) | ± 0.5° |
| < 600 mm (24″) | ± 0.250 mm (± 0.010″) | ± 1.0° |
| < 900 mm (36″) | ± 0.400 mm (± 1/64″) | ± 1.0° |
| < 1500 mm (60″) | ± 0.8 mm (± 1/32″) | ± 1.0° |
| > 1500 mm (60″) | ± 1.6 mm (± 1/16″) | ± 1.0° |
| 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/-0 |
| Angularity | +/- 2 degrees |
| Surface roughness (blank material) | Ra 125 uin max |
| Surface roughness (timesave) | Ra 100 uin max |
| Part size (mm) | Precision tolerance | Ordinary mold tolerance |
|---|---|---|
| 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 |
| 1000~1400 | ±2.30~2.65 | ±3.50~4.05 |
| 1400~2000 | ±3.05~3.80 | ±4.65~5.80 |
| Process | Tolerance |
|---|---|
| FDM | ± 0.5% with a lower limit of ± 0.5 mm (± 0.020″) |
| SLA | ± 0.5% with a lower limit of ± 0.15 mm (± 0.006″) |
| SLS | ± 0.3% with a lower limit of ± 0.3 mm (± 0.012″) |
| Polyjet | ± 0.1% with a lower limit of ± 0.1 mm (± 0.004″) |
China Medical CNC Machining Inc. Quality Control System
In order to deliver consistently high-quality parts that meet our customer needs, we employ a series of inspection methods, covering the entire manufacturing process.
Pre-Production Quality System
Technical assessment
Before the production starts, China Medical CNC Machining Inc. engineering team check and confirm on the material, structure, process, and other details of your 3D and 2D drawings. This prevents possible mistakes and unachievable requirements at the very beginning.
Material verification
On the request of customers, we provide the certification of the material used in the manufacturing process. The report comes from the raw material manufacturer and usually includes: material heat number, material grade, material dimensions, mechanical properties, chemical analysis, etc.
During Production Quality Control
On-site inspection system
It is fundamental and vital in precision machining that the material block is always at the right position. With on-site inspection system, the machines automatically examine the positions, and make adjustments accordingly. This avoids the issues at the early stage, and help save cost and time.
In-process quality control
At China Medical CNC Machining Inc., we strictly obey the ISO9001:2015 requirements. The quality control staff conducts routine inspections for all parts that are being produced every 2 hours.
First article inspection
To give our customers peace of mind before moving into mass production, we offer First article inspection for injection molding orders, and can be specially requested for CNC machining. We will examine the sample part, and provide inspection report with images. We will ship the part for your verification when necessary.
Before Delivery Final Checkup
Full-dimensional inspection report
For orders on China Medical CNC Machining Inc. platform, we provide full dimensional inspection report on customers’ request. The report includes: quantity of parts, critical dimensions, threads and tolerances, thicknesses and depths, part appearance, etc.
Packaging
The logistics is unpredictable, so we try our best to lower the risks for you. 4 layers of protection are applied on the package: 1. Wrapping paper 2. EPE 3. Foam 4. Paper/Wooden box. We dedicated to delivering the most high-quality and beautiful parts to meet your expectations.
Design Verification Program
To give our customers peace of mind before moving into production, we offer First Part Verification.
The program, which reduce risks and ensure the parts meet your requirements, is open for orders that include a minimum individual part quantity of 50 units or $5,000 USD order value.
Process
- You request first article inspection for a quote that meets our design verification program requirements.
- China Medical CNC Machining Inc. reviews the quote and grants you access to utilize DVP.
- You sign the quote provided by China Medical CNC Machining Inc. and agree on DVP Terms and Conditions.
- We produce two of the parts and sends them to you.
- You receive and examine the parts, then inform China Medical CNC Machining Inc. that fullscale production may begin.
- The full production starts and is delivered within lead time.
Quality Reports & Certifications
Full Dimensional Inspection Report
For every order on our platform, we provide a full dimensional inspection report on customers’ request. Dimensions are verified using a precision measuring instrument (caliper or gauge) and with a Coordinate Measuring Machine when required. The report includes:
- Quantity of parts
- Critical dimensions
- Threads and tolerances
- Thicknesses and depths
- Part appearance
Material Certification
On the request of customers, we can provide the certification of the material used in the manufacturing process. The report comes from the raw material manufacturer and usually includes:
- Material heat number
- Material grade
- Material dimensions
- Mechanical properties
- Chemical analysis
- Heat treatment (if applicable)
Guaranteed Quality
China Medical CNC Machining Inc. Co.,Ltd strictly follow and implement ISO quality standards and have passed ISO 90001: 2015 certification. You can click here for download certificate report.
Real Customer Feedback
The parts arrived on Monday. Thanks for the prompt service and attention to our order. We have inspected the parts and installed them in one of our assemblies. The quality, fit, and finish are excellent. I will place an order for a larger quantity.
— Jessie Beck
I received the sample today and am very happy with the chrome finish as well as the overall look. I was also impressed with how well you packaged the items 🙂
— Alvaro Reese
Getting the quotation online is a mind-blowing experience, and the result turned out to be impressive. It saves me a lot of time and efforts on communicating.
— Toby Dalton
Inspection Equipment
China Medical CNC Machining Inc. employs X-Ray Fluorescence (XRF) analysis, a non-destructive testing method that uses short-wave X-rays or gamma radiation to determine the elemental composition of metals, plastics and other materials, to inspect the quality of the materials.
After manufacturing is complete, an optical comparator, also known as a projector, is used to inspect components, precisely measuring their dimensions and comparing them to the original dimensions of the CAD model. Any inconsistencies detected by the projector are alerted in a detailed inspection report.
At China Medical CNC Machining Inc., we use a second inspection process, Coordinate Measuring Machine (CMM) after manufacturing. By capturing a series of points from the object, CMM technology can accurately determine the dimensions of components. It is especially suitable for parts with complex geometries.
Resolving Quality Issues
Our number one priority at China Medical CNC Machining Inc. is delivering high-quality parts that meet customer requirements. If your order is not up to this standard and fails to meet specifications, please get in touch with us within five business days of receiving your order and we will resolve the problem rapidly, within 1-3 business days.Occasions for rework:
- Unacceptable processing defects
- Fail to meet tolerance requirement
- Incorrect material/finish
Occasions for refund:
- The part is not machinable
- The customer does not agree to rework
- Other reasons
Get Your Parts Into Production Today
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