CNC Swiss Machined Parts, Turned Parts & Centerless Grinding Services

Pioneer Service is a contract manufacturer providing CNC Swiss screw machine parts and CNC turned parts in prototype and production quantities. We are able to meet demanding needs for precision machined components and sub-assemblies for industries including medical, automotive, fastener, hardware, motor/pumps, HVAC, motion control, oil and gas and many others. Pioneer Service has been providing custom machined solutions for over 30 years.

We have CNC Swiss lathes, CNC turning centers with live tooling to consolidate operations. Parts can be provided with internal and external threading, knurling, slotting, cross drilling and tapping and more. In addition, our in-house centerless grinding capabilities deliver precision, micro-finished surfaces as low as 2RMS with extremely quick turnarounds.


  • CNC Swiss Star Lathes with FANUC Controls, high pressure pump and 12′ bar feeders

  • CNC Turning Centers (Doosan) – Complex geometries up to 2.66″ OD

  • Centerless Grinders, both thru-feed and in-feed (plunge grinding) for precision tolerances and finishes

  • Various secondary operation equipment (Such as tumblers, deburring equipment, slotting)

  • Quality Inspection Equipment

  • Extensive finishing services with partner companies including plating, heat treatment, anodizing, etc.

CNC Swiss Machined Parts

For complex parts diameter with tight tolerances, our Swiss screw machines offer:

  • Outside diameters to 1.5”

  • Lengths to 6”

  • High accuracy parts with tolerances in the .0000’s in inches

  • Complex parts with multiple operations handled in one set-up and dropped from the machine

  • Cost-effective parts, especially for quantities over 5,000

CNC Turned Parts

For complex geometries and short runs, including prototypes, our CNC turning centers offer:

  • Outside diameters to 2.66”

  • In-line product features without secondary operations

  • Minimal tooling costs

  • Faster delivery of prototypes and production quantities

  • Flexible order quantities

Centerless Grinding Services

For parts with tight tolerances on the OD, or flats, centerless grinding may be an option. Pioneer Service offers both in-feed and thru-feed grinding for parts. (In addition to in-house bar grinding capability.) You may send in your parts for grinding or it may be part of the process for a part that Pioneer Service is making on other equipment.

In-Feed Grinding

  • Part Diameter Range: .065″ to 1.5″

  • Part Length Range: .250″ to 6.0″

Thru-Feed Grinding

  • Part Diameter Range: .065″ to 1.5″

  • Part Length Range: .250″ up to 40″ (depending on diameter)

Common Tolerances

  • OD: +/-.0001″

  • Straightness: .001″/in

  • Concentricity: .002″

  • Run-out: .001″ up to 12” (.002 over 12”)

  • Surface finish (Ra): 6 micro-inch

CNC Swiss machining has lots of quick-turn options to produce complex parts

Pioneer Service specializes in short lead-time requirements for orders of all quantities. To accomplish this, we stock multiple grades and sizes of raw material (including stainless steel). We offer customizable WIP and finished goods stocking programs to provide extreme flexibility for customers.

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Why buy CNC Turned parts from Pioneer Service?

Prototyping Through High-Volume Production

Design engineers value our commitment to rapid prototyping with a dedicated CNC. We know that when you’re testing your ideas, you need fast turn-around on quotes and parts. We’re here to make your job easier by providing feedback that only comes from experience. And when you’re ready for production, your supplier development and purchasing team will be glad you’re working with one company that can handle the volume with the same quality as the prototype.

Newest generation CNC Turning Centers in-house

Our 6-axis CNCs meet demands because they:

  • Can accommodate off-center drilling, milling and tapping with Y-axis turrets, dual spindles and a 24-position turret.
  • Allow all operations to be completed in one setup due to synchronized C1-axis (main spindle) and C2-axis (sub-spindle) indexing.
  • Can make complex parts quickly with non-stop, bi-directional indexing turrets that take only .2 second to move to the next position.
    Eliminate secondary operations with Y-axis drilling.
  • Can turn and mill pre-hardened material with a 20 HP main spindle and 10 HP sub-spindle.
  • Ensure minimum bending and torsion during heavy-duty cuts and high-speed turning operations due to cast iron structure and 30 degree slant bed design.

Dedicated CNC Turning Center solely for prototypes

Prototyping and short-runs are an important part of our business. We have dedicated a CNC turning center solely for prototypes.

DFM reviews and quotes when you need them

Our team of experienced professionals can provide “Design for engineering” (DFM) support and let you know production feasibility. We know that when you’re testing your ideas, you need fast turn-around on quotes and we’re ready to help. Quality CNC turned parts are best built with great relationships!

Provide your clients a competitive advantage

All our capabilities and experience add up to shorter lead-times. When you’re ready for a prototype, we know delivery is critical. We have resources set aside to ensure quick delivery on prototype orders.

Customized Supplier Managed Inventory options

At Pioneer Service, our inventory programs are as unique as our customers. We understand the challenges of forecasting and offering stocking programs at no additional cost. With our on-hand stock, we’re there when there’s a spike in demand.

We know that bringing on a new supplier can be time-consuming. Our dedicated Quality Assurance staff and experienced operations team will help make that process run smoothly. By working with Pioneer Service, OEM’s receive the added value of supplier diversity spend, since we are a certified Woman-Owned business, as recognized by the WBENC, WOSB, and California’s Public Utilities.

“Can honestly say Pioneer Service’s team is one of the best communicators I deal with when it comes to suppliers.”

Tina  – Industrial Industry

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