CNC Machining Service

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What is CNC machining?

CNC machining is a subtractive manufacturing process in which various precision cutting tools are used to remove raw materials to make a part or product.

Advanced software is used to control device specifications according to your 3D design.

Our team of engineers and mechanics program the equipment to optimize cutting time, surface finish and final tolerances to meet your specifications.

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CNC Milling

CNC milling is a subtractive manufacturing process that uses 3-axis milling and 5-axis indexed milling processes to cut solid plastic and metal blocks into final parts.

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CNC Turning

CNC turning with live tooling combines both lathe and mill capabilities to machine parts with cylindrical features from metal rod stock.

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CNC Machining Services

RJC provides a variety of precision CNC machining services including milling, turning, 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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Surface treatment of CNC machining service

This is our standard finish. Parts are machined and deburred, sharp edges are chamfered.

–Smooth machining is like an ‘As machined’ finish but slightly less evident machine marks. Parts are machined at a lower feed, and no hand polishing is applied.

–To reduce machining marks, parts are brushed manually with #400 – 600 grit sandpaper. Ideal to slightly reduce the roughness of the finish.

–To reduce machining marks, parts are brushed manually with #400 – 600 grit sandpaper. Ideal to slightly reduce the roughness of the finish.

–Powder coating is a strong, wear-resistant finish compatible with all metal materials.

Parts are bead blasted with glass beads, resulting in a grainy texture and reduced machining marks.

–Applicable on steels, black oxide is a conversion coating used to improve corrosion resistance and minimize light reflection.

–Parts are machined to Ra1.6μm and electroless nickel plated. Ideal for wear abrasion and corrosion resistance, not for cosmetic purposes.

–Parts are machined, and an anodizing type III coating is directly applied to the surface—ideal for improving corrosion and wearing resistance of components.

–Parts are anodized (type II) directly after machining. The most cost-effective anodizing option, ideal for non-cosmetic, functional parts. They are used to improve wear and corrosion resistance.

–Parts are manually brushed with fine sandpaper to attenuate the machining marks and then anodized. Ideal for increasing the corrosion resistance of the part. Typically results in a glossy aspect.

–Parts are brushed and electropolished. Ideal for reducing the micro-roughness of the part.

–Parts are machined, and a chromate conversion coating is applied. Ideal for increasing the part’s corrosion resistance while maintaining its conductive properties. RoHS compliant.

–Parts are bead blasted, anodized type II, and bright dipped. Results in glossy colour. Ideal for cosmetic parts needing an increase in corrosion resistance.

–Parts are bead blasted and anodized type II. Ideal for increasing the corrosion resistance of the part. Results in naturally matte colors. For glossy colors, please select the bead-blasted + glossy anodizing option.

–This is a batch-based process that tumbles vibrating media to remove sharp edges and burrs on machined parts. Tumbling can remove machine marks on exterior surfaces. Parts over 8” may require a manual review.

–Type II  (MIL-A-8625, Type II) creates a corrosion-resistant finish. Parts can be anodized in different colors—clear, black, red, and gold are most common—and is usually associated with aluminum. Type III (MIL-A-8625, Type III, Class 1/2 “hardcoat”) is thicker and creates a wear-resistant layer in addition to the corrosion resistance seen with Type II.

–A surface finish for titanium per AMS-2488 Type 2 specification. Also called Tiodize, this finish increases fatigue strength and the wear resistance of a part. Titanium anodized parts are common in aerospace and medical device manufacturing. Non-pigmented titanium anodize finishes will dull shine.

mpregnated Hard Anodize–A hard coat anodize process that embeds PTFE to create a self-lubricating, dry contact surface with Type 3 hard coat’s protective properties. This finish can be used on aluminum alloys or titanium and increases the service life of the product. This finish conforms to the AMS-2482 Type 1 Hard Coat Anodizing with Teflon (Non-Dyed).

–Improves corrosion resistance for 200 and 300 series and precipitation hardened corrosion-resistant steels. Thickness is negligible, about 0.0000001”. Conforms to ASTM A967, AMS-QQ-P-35, MIL-STD-171, ASTM A380, or AMS 2700.

–An electrochemical process cleans steel parts to reduce corrosion and improve appearance, by making the metal brighter. Removes about 0.0001”-0.0025” of the metal. Conforms to ASTM B912-02.

–Silver offers high solderability and electrical conductivity but is susceptible to tarnish. Conforms to AMS QQ-S-365D. Thickness is about 0.00002” – 0.0003.”

–Gold Plating provides good corrosion and tarnish resistance with excellent solderability. Default application specification is MIL-G-45204 and ASTM B488, CLASS 00, 0, OR 1. Thickness is about 0.00002″ – 0.00005.”

–Provides uniform zinc coating which offers protection from corrosion, oxidation, and wear on irregular surfaces. Conforms to ASTM B633-15.

– Available upon your request.

CNC Machining Materials RJC Use

Metal CNC Machining Materials

Type Material Type Material
Aluminum Aluminum 6061-T651 Low Carbon Steel Low Carbon Steel CR 1008
Aluminum Aluminum 7075-T651 Low Carbon Steel CR Galvanized
Aluminum Aluminum AlSi10Mg Low Carbon Steel CR Galvannealed
Aluminum Aluminum 5052-H32 Stainless Steel Stainless Steel 17-4 PH
Brass Brass C260 Stainless Steel Stainless Steel 304/304L
Brass Brass C360 Stainless Steel Stainless Steel 316
Cobalt Chrome Cobalt Chrome Stainless Steel Stainless Steel 316L
Copper Copper C101 Stainless Steel Stainless Steel 303
Copper Copper C110 Steel Alloy Steel Alloy 4140
Copper Copper CuNi2SiCr Titanium Titanium Ti 6Al-4V
Inconel Inconel 718 Titanium Titanium Grade 5 6A1-4V
Low Carbon Steel Steel CR 1018

Plastic CNC Machining Materials

Type

Material Type

Material

ABS ABS PMMA (Acrylic) PMMA (Acrylic)
ABS ABS Flame Retardant POM (Acetal/Delrin) Acetal Homopolymer (Delrin 150)
CPVC CPVC POM (Acetal/Delrin) Acetal 20% GF (Delrin 570)
HDPE HDPE POM (Acetal/Delrin) Acetal Copolymer
LDPE LDPE POM (Acetal/Delrin) Acetal Static Dissipative (Tecaform SD)
PA (Nylon) Nylon 6 Light Blue PP PP (Polypropylene Homopolymer)
PA (Nylon) Nylon 6/6 PP PP (Polypropylene Copolymer)
PA (Nylon) Nylon 6/6 (30% GF)_Natural PPE/PS PPE/PS
PA (Nylon) Nylon 6 Black PPE/PS Noryl 265
Polycarbonate (PC) Polycarbonate (20% GF) PPSU PPSU
Polycarbonate (PC) Polycarbonate – Black PPSU Radel R 5500
Polycarbonate (PC) Polycarbonate – Clear PS PS (HIPS)
Polycarbonate (PC) Polycarbonate – Translucent PSU PSU
PEEK PEEK PTFE (Teflon) PTFE (Teflon)
PEI Ultem 1000 PVC PVC
PEI Ultem 2300 (30% GF) UHMW UHMW
PET PET UHMW Quadrant EPP Tivar 1000

RJC CNC Machining Design Guidelines and Capabilities

  • Maximum Part Size: Milled parts up to 80” x 48” x 24” (2,032 x 1,219 x 610 mm). Lathe parts up to 62” (1,575 mm) length and 32” (813 mm) diameter.
  • Standard Lead Time:  3 business days
  • General Tolerances: Tolerances on metals will be held to +/- 0.005″ (+/- 0.127 mm) in accordance with ISO 2768 unless otherwise specified. Plastics and composites will be +/- 0.010”.
  • Precision Tolerances: RJC 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: RJC can accommodate any standard thread size. We can also machine custom threads; these will require a manual quote review.
  • Edge Condition: Sharp edges are broken and deburred by default
  • Surface Finish: The standard finish is asmachined: 125 Ra or better. Additional finishing options can be specified when getting a quote.
  • Internal corner fillets: Design internal corner fillets to be 0.020” – 0.050” greater than a standard drill size for the radii. Follow a drill diameter to depth ratio of 1:6 (1:4 recommended) as a guideline for internal corner radii.
  • Floor fillets: Design floor fillets smaller than corner fillets to allow the same tool to clear material from the interior.
  • Undercuts: Always design undercuts to standard sizes and away from corners so they are accessible by the cutting tool.
  • Tapped/threaded hole depth: Provide tool clearance slightly beyond the tapped hole depth to ensure complete threads.
  • Complexity: Keep the number of small cuts to a minimum to reduce costs; only design in the necessary features to balance function with aesthetic.

RJC follows ISO-2768 Standards for CNC Machining

Limits for nominal size

Metal (ISO2768-m) Plastic

0.5mm to 3mm

±0.05mm

±0.1mm

Over 3mm to 6mm

±0.05mm

±0.1mm

Over 6mm to 30mm

±0.1mm

±0.2mm

Over 30mm to 120mm

±0.15mm

±0.3mm

Over 120mm to 400mm ±0.2mm

±0.5mm

Over 400mm to 1000mm ±0.3mm

±0.8mm

Over 1000 mm to 2000mm ±0.5mm

±1.2mm

Over 2000mm to 4000mm ±2mm

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