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3D HUBS - MANUFACTURING STANDARDS
Last updated: 26 May 2018
Any order placed should take the following manufacturing limitations in mind, unless otherwise agreed between the parties under specific circumstances.
2. 3D Printing
All surfaces will have a consistent visual appearance. Parts will have the support structures removed and will be cleaned of all excess support/build material.
The acceptable accuracy of parts varies by technology and is stated as:
- FDM: ± 0.5% with a lower limit of ± 0.5 mm (± 0.020");
- SLA/DLP: ± 0.5% with a lower limit of ± 0.15 mm (± 0.006");
- SLS/MJF: ± 0.3% with a lower limit of ± 0.3 mm (± 0.012");
- Material Jetting: ± 0.1% with a lower limit of ± 0.1 mm (± 0.004");
- Binder Jetting (non-metal): ± 0.5% with a lower limit of ± 0.3 mm (± 0.012");
- Binder Jetting (metal): ± 2% with a lower limit of ± 0.2 mm (± 0.008") after sintering - tolerances not guaranteed on the first attempt;
- DMLS/SLM: ± 0.2% with a lower limit of ± 0.2 mm (± 0.008"), for parts smaller than 10 mm in any dimension. ± 2% for parts over 10 mm in any dimension - tolerances not guaranteed on the first attempt.
3. CNC machining
If not otherwise specified on the technical drawing, all parts will be machined to ISO 2768 tolerance standards:
|Limits for nominal size||Plastics (ISO 2768- m)||Metals (ISO 2768- f)|
|0.5mm* to 3mm||±0.1mm||±0.05mm|
|Over 3mm to 6mm||±0.1mm||±0.05mm|
|Over 6mm to 30mm||±0.2mm||±0.1mm|
|Over 30mm to 120mm||±0.3mm||±0.15mm|
|Over 120mm to 400mm||±0.5mm||±0.2mm|
|Over 400mm to 1000mm||±0.8mm||±0.3mm|
|Over 1000mm to 2000mm||±1.2mm||±0.5mm|
|Over 2000mm to 4000mm||±2mm|
Standard order surface finish shall be referred to as As Machined and requires a ~125 RA µin (3.2 RA µm) finish. Minor tool marks visible on the part are acceptable. All sharp edges and burrs will be removed. If any form of threads (internal or external), any non-standard tolerances or any non-standard surface finish are required, these must be clearly indicated in a technical drawing.
For anodized (color) or powder coating, unless the desired color is “black”, this must be clearly communicated in the form of a RAL or PANTONE number. The manufacturer will match it at the best of his ability. Perfect color match cannot be guaranteed.
4. Injection molding
Standard core & cavity surface finish will have minimal machining marks and will be smoothed to the manufacturer's discretion. In case a different finish is required, this must be specified clearly in the form of an SPI finishing standard.
Part shrinkage will be determined by the manufacturer and the molds will be CNC machined to standard tolerances of ± 0.125 mm (± 0.005") after adjusting for part shrinkage. Unless otherwise noted, standard tolerance of ± 0.250 mm (0.010") will be held for each manufactured part. Part-to-part repeatability will typically be < 0.100 mm (0.004"). Any tolerances tighter than ± 0.125 mm (± 0.005") will be a best effort. If alterations are required after first article inspection to achieve tighter tolerances, additional charges may apply. Design changes, such as draft and increased or decreased wall thickness may be required to improve moldability and may affect pricing.
Unless otherwise specified, all quotes are based on the assumption that standard injection molding equipment will be used. If special tooling configurations are required, they must be expressed during the quoting process.
Questions regarding the specifications in this document should be directed to firstname.lastname@example.org.