Frequently Asked Questions

Feel free to contact us if you have any questions about manufacturing.

General Service QA

We accept 3D CAD files in STL, STP, STEP, OBJ IGS or IGES format and 2D drawings(jpg, png, gif, bmp, pdf) with dimensional details and specific manufacturing requirements.

We respond within 2 hours after your request. DFMA analytics and Princing quote will be send within 24 hours. If the quote is delayed, we will notify you as soon as possible.

Yes, master models are used to create silicone molds for vacuum casting and can be made from any rigid solid that can withstand heat up to 100 °C. Models used for CNC machining will be 3D scanned to create a CAD/CAM program for production.

Quality parts less than 1000pcs can be made in as fast as one week if you provide complete 2D and 3D CAD models. More complex parts requiring other special features will take longer. As for shipping, most of our shipments are via air freight, which can take 5-7 days from China to Europe or North America.

We respect your intellectual property. None of your information, images, files or likenesses will be shared with any third party, and it will not be used for any advertising, marketing, or promotional use without your explicit written authorization. If you would like to sign NDA agreement, please contact our team for support.

We follow the ISO/IATF standard and guarantee that we will rework the products or refund them if there are any quality problems. The full-dimensional report, material certification, or first article inspection are provided on request before order placement.

CNC Machining

CNC machining is a process of cutting and shaping metal, wood and other materials with the help of computers. There are various types of CNC machines that are used for different processes such as routing, milling, engraving and turning.

Learn more about CNC machining...

The most common types of CNC machine include CNC Lathes and Turning Machines, CNC Milling Machines, CNC Grinding Machines, CNC Laser Cutting Machines, CNC Electrical Discharge Machines(EDM), CNC Water-jet Cutting Machine.

CNC machining is controled by a computer, it takes design from a computer software and then uses the 3-axis or 5-axis milling/turning tool to precisely cut away at the material until the desired component is produced.

The price of CNC machining per hour can be as low as $10 or as high as $200 per hour depending on the type of material and cnc machine being used.

Plastic: ABS, PC, ABS+PC, PP, PS, POM, PMMA (Acrylic), PAGF30, PCGF30, Teflon, DHPE, HDPE, PPS, PEEK.

Metal: Aluminum, Steel, Stainless Steel (17-4, Inconel 625 & 718), Magnesium, Titanium, Zinc, Brass, Bronze, Copper.


The materials above are the most common materials for CNC machining. Besides, we can work with any type of machinable plastic and metal that can be purchased from the market.

Sheet Metal Fabrication

Sheet metal fabrication is the technique of creating metal pieces out of a single sheet of material.

Sheet metal fabrication involves cutting, bending and assembling processes to fabricate a sheet metal workpiece into a final product. A wide range of procedures exist which are used in processing sheet metal. As a general rule, these processes can be grouped into “cutting” and “deforming” categories.

Injection Molding

Injection molding is a method of producing molded products by injecting molten plastic materials into a mold, then cooling and solidifying them. The method is well suited for mass production of products with complex shapes, and it is widely used in the field of plastic processing.

Injection molding is a manufacturing process that allows for parts to be produced in large volumes. It works by injecting molten materials into a mold (mould). It is most typically used in mass-production processes where the same part is being created thousands or even millions of times in succession.

Urethane Vacuum Casting

The vacuum casting process refers to the production of plastic or rubber components from silicone molds under vacuum. Vacuum cast parts are dimensionally accurate, precise replicas of the master pattern, with profiles and texture faithfully reproduced.

3D Printing/Additive Manufacturing

3D printing or additive manufacturing is a manufacturing process that turns a digital model file into a physical object. The technology works by layering material on top of material to create a complete object.

Surface Finish

Surface finish or surface treatment is an additional process applied to the surface of a material for the purpose of adding functions such as rust and wear resistance or improving the decorative properties to enhance its appearance.

SPI A2 is slightly finer than A1 and RA.1-2 made by #6 diamond buff.

SPI (Society of Plastic Industry) standards chart:

FinishSPI* standardFinishing MethodTypical surface roughness Ra (μm)
Super High Glossy finishA-1Grade #3, 6000 Grit Diamond Buff0.012 to 0.025
High Glossy finishA-2Grade #6, 3000 Grit Diamond Buff0.025 to 0.05
Normal Glossy finishA-3Grade #15, 1200 Grit Diamond Buff0.05 to 0.10
Fine Semi-glossy finishB-1600 Grit Paper0.05 to 0.10
Medium Semi-glossy finishB-2400 Grit Paper0.10 to 0.15
Normal Semi-glossy finishB-3320 Grit Paper0.28 to 0.32
Fine Matte finishC-1600 Grit Stone0.35 to 0.40
Medium Matte finishC-2400 Grit Stone0.45 to 0.55
Normal Matte finishC-3320 Grit Stone0.63 to 0.70
Satin Textured finishD-1Dry Blast Glass Bead #110.80 to 1.00
Dull Textured finishD-2Dry Blast #240 Oxide1.00 to 2.80
Rough Textured finishD-3Dry Blast #24 Oxide3.20 to 18.0
As machined-Finished to the machinist's discretion3.20 (with visible machining marks)

On-demand Manufacturing Service

LEADRP provides high-quality prototypes and on-demand manufacturing service with exceptional customer support and quick turnaround times since 2006. Click to tell us your project or contact us for more information.

CNC Machining Service

We make your custom products better and faster

LEADRP could help you with all the important and complex work of custom product prototyping and manufacturing, from initial designs to low-volume production, post-processing, logistics, and more. LEADRP is dedicated to speeding up your prototyping and manufacturing processes and reducing costs. Whether it's a one-off prototype made or a batch production of thousands, LEADRP is here to help.

  All uploads are secure and confidential, check our IP Protection Policy. If it prompts that the file format does not support uploading, please compress the file into a zip file before sending it.

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We make your custom products better and faster

Whether it's a one-off prototype made or a batch production of thousands, LEADRP is ready to support your project. Just tell us your project, and we will contact you within 12 hours.

All uploads are secure and confidential, click to check our IP Protection Policy. You can also contact us ( to sign a NDA before sending any design files to us. If it prompts that the file format does not support uploading, please compress the file into a zip file before sending it.