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SIPX’s CNC Machining Services

SIPX provides a variety of precision CNC machining services including milling, turning, EDM, wire EDM and surface grinding. With precision 3-, 4- and 5-axis CNC machining centers, combined with other advanced capabilities and our experienced team, we can handle all types of CNC machining parts in both metal and plastic materials. Whatever you need prototypes or production parts, our machining services will be your best choice. Contact us today to get your machining parts done in as fast as 5 days!

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CNC Milling

CNC milling is a subtractive process that using 3-, 4-, & 5-axis milling machines with various of cutting tools to remove materials from solid plastic and metal blocks into final parts with different geometries as designed.

cnc turning s

CNC Turning

CNC turning is a more efficient method to manufacture round shaped components from plastic and metal bars or tubes, such as shafts, worms. Combines with live tooling, milled geometries can be done in the meantime.

cnc drilling bg s

CNC Drilling

Drilling is the cutting process in which the workpiece does not move, making the cutter move, aligning the cutter center with the hole center, and making the cutter rotate. CNC Drilling is primarily done on CNC machines including CNC milling machines and lathes.

CNC Machining Materials & Finishes

We offer over 100 plastic and metal materials, and take great care to ensure the right material is used for every part. With a wide range of CNC machines, we are able to provide stand tolerance CNC machined parts with the most economic price and super precision machined parts for the high-end products.

CNC Materials

Aluminum Steel Alloy
Brass Steel Mild Low Carbon
Copper Titanium
Stainless Steel
ABS PMMA (Acrylic)
PP Teflon

CNC Finishes

As Machined

The most popular and cost efficient way for inner functional components. This is the finishing option with the fastest turnaround. If you opt for as-machined finishing, your parts may be left with visible tool marks and potentially sharp edges and burrs, but we can remove these upon request.

Powder Coated

The most popular and cost efficient way for inner functional components. This is the finishing option with the fastest turnaround. If you opt for as-machined finishing, your parts may be left with visible tool marks and potentially sharp edges and burrs, but we can remove these upon request.

heat treatment finishing
  1. Quenching and tempering
  2. Normalising and tempering
Anodized Parts Anodizing Finish

Type II creates a corrosion-resistant finish. Parts can be anodized in different colors—clear, black, red, and blue are most common—and is usually associated with low silicone element series of aluminum. Type III is thicker and creates a wear-resistant layer in addition to the corrosion resistance seen with Type II.

Polishing Surface Finish

Polishing is to make the surface smooth by physical friction processing, it is often used to prevent corrosion and remove oxidation. After polishing, the parts have a smoother and brighter finish.

Beat Blasting Finishing

Bead blasting is the process of spraying abrasive on the surface of parts under high pressure, after sandblasting, the metal parts have a satin texture or frosted surface, eliminating the processing marks.


Electropolishing is the reverse process of electroplating, which simplifies the metal surface at the micro-level through chemical solution. After electropolishing, metal parts can be more bright and reduce surface roughness.

Black Oxided Parts

The black oxide is a chemical conversion coating, it is produced by a chemical reaction between iron and oxide salt in black oxide solution. The corrosion resistance of parts can be improved after black oxidation.

Machining surface finish chart degree, Ra, Rz, RMS


China China China USA USA Ra USA RMS Machining Finish Method
Finish Degree Ra (um) Rz (um) Ra (um) (micro inch) (micro inch) refer to casting-parts.com
1 50 200 50 2000 2200 The most coarse machining or good rough casting surfaces
2 25 100 25 1000 1100 Machining marks very obvious.
Rough turning, boring, planning, drilling.
3 12.5 50 12.5 500 550 Machining marks obvious.
Rough turning, planning, milling, drilling.
4 6.3 25 8 320 352 Machining marks visible.
Normal turning, boring, planning, drilling, grinding.
6.3 250 275
5 3.2 12.5 5 200 220 Machining marks not obvious, but still visible.
Normal turning, boring, planning, drilling, grinding.
4 160 176
3.2 125 137.5
6 1.6 6.3 2.5 100 110 Machining marks blur, but marks direction obvious.
Number controlled turning, boring, planning, drilling, grinding.
2 80 88
1.6 63 69.3
7 0.8 6.3 1.25 50 55 Machining marks direction blur, but still visible.
Number controlled turning, boring, planning, drilling, grinding.
1 40 44
0.8 32 35.2
8 0.4 3.2 0.63 25 27.5 Machining marks direction blur.
Reaming, grinding, boring, rolling.
0.5 20 22
0.4 16 17.6
9 0.2 1.6 0.2 12.5 13.75 Machining marks direction invisible.
Grinding, super machining.
10 11
8 8.8
10 0.1 0.8 0.1 4 4.4 Surface dark gloss.
Super machining.
surface roughness machining card2


Description General Tolerance or Standard
Maximum Part Size Milled parts up to 80” x 48” x 24” (2,032 x 1,219 x 610 mm).
Distance Dimensions For features of size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005”.
Orientation and Form Dimensions 0-12″ +/- 0.005″, Angularity 1/2 degree. For 24″ and beyond please consult SIPX’s Manufacturing Standards.
Precision Tolerances SIPX can manufacture and inspect to tight tolerances per your drawing specifications including GD&T callouts.
Minimum Feature Size 0.020” (0.50 mm). This may vary depending on part geometry and chosen material.
Threads and Tapped Holes We can accommodate any standard thread size. We can also machine custom threads; these will require a manual quote review.
Surface Finish The standard finish is as-machined: 125 Ra or better. Additional finishing options can be specified when getting a quote.
Edge Condition Sharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print.

Our Advantages

  • Rapid Turnaround: Using the latest CNC machines, we produce highly accurate, quick mill parts in as fast as 1 day. We also instantly quote CNC machined parts, cutting days off of your RFQ process.
  • High Precision Tolerances: Offers high-precision tolerances ranging from +/-0.001″ – 0.005″, depending on customer specs. We are the experts in making parts that are truly custom and ready to use.
  • Scalability: CNC Machining is perfect for prototyping and production production parts. Xometry’s massive scale can help you scale up from testing phase to production runs of 100,000 parts of more.
  • Material Selection: Choose from over 50 metal and plastic materials. CNC Machining offers a wide variety of certified materials.

Successful Cases

We have been helping various industries such as aerospace, automotive, medical devices, and other industries to develop various products since 2005.

Why Choose SIPX for Machining Services?

Start Your Project With A Rapid Quote

Reply within 8 Hours

With over 10 years of experience, Sipx is well versed in this field. Yes, you are dealing with masters. You can trust us with your needs and expectations.

You will save 20-30% of the cost because of our excellent production capacity. Furthermore, we only insist on making high-quality casting products.

  • Rapid Prototyping
  • One-Stop Services Supplier
  • On-demand Manufacturing
  • ISO 9001:2015 Certificated
  • Strict Quality Control System