Guidelines for Swiss Screw Machined Components

Precision Swiss Screw machining of metal and plastic components continue having major impacts on the medical, aerospace and defense industry. To deliver exceptional performance - every product manufactured for these industries must be created using the most current and accurate manufacturing technology. 

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Tips on Precision Swiss Screw Machining Materials

When it comes to Swiss screw machining, Swiss turning is required to make the small, slender, complex and precision components. This is only possible because of this machine's unique design. 

For a Swiss turning machine - the bar-stock material is gripped tightly. Then it is advanced by the sliding headstock. It then travels through a guide-bushing into the machining section.   

Tips for Materials to Use:

Aluminum

  • 6061 Aluminum is heat treatable, weldable, and formable. Corrosion resistant. Often used within electronic hardware.
  • 7075 Aluminum has high mechanical properties offers improved stress corrosion, cracking resistance, increase strength – Suitable for components for aircrafts.

Plastic 

  • Acetal provides high-strength and stiffness. It gives enhanced dimensional stability and ease of machining with good wear properties, especially in wet environments.  
  • Delrin is used a lot for insulators or bearings and has good machinability properties.
  • PEEK has excellent chemical, thermal and water resistance.  It maintains a high heat resistance strength and excellent radiation resistance.  It is excellent abrasion, shock and fatigue resistance.
  • TEFLON has outstanding chemical and weathering resistance and UV stabilized.
  • Nylon has good machining properties and used for insulators, bearings etc.

Stainless Steel  

  • 17-4 Stainless Steel has excellent corrosion resistance and is heat treatable used in many medical or aerospace applications needing corrosion resistance and hardness.
  • 303 Stainless steel is used for electronic hardware, automotive, aerospace, medical instruments and many applications requiring corrosion resistance.
  • 304/304L stainless steel provides better weldability and formability and is slightly more corrosion resistant.
  • 316/316L stainless steel has even better corrosion resistance and used for medical implants, surgical instruments and aerospace applications.
  • 347 stainless steel offers good mechanical properties at high temperatures used for high temperature products like gaskets, rocket engine parts, expansion joints, aircraft collector rings, exhaust manifolds, chemical production equipment.
  • 416 stainless steel can be heat treated so it can be used for applications that need less corrosion resistance and more hardness.
  • 420 stainless steel can be hardened through heat treatment and is good for shear blades, needle valves, dental and surgical equipment, pump shafts etc.
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The Value of Swiss Screw Machining for Precision Components

CNC Swiss-type automatic lathes are more powerful than ever - while retaining the fast-cycle times with the same flexibility that makes them a standard for most precision, high-production applications.

Today even more tools and greater options are available. Sophisticated controls usher streamlining into the machining process. Swiss screw machining is always preferred for the longer, more slender turned parts, widely used for smaller, highly complex parts and works well for the pieces that have no turned surfaces at all.

Conventional lathes have a fixed headstock. The workpiece itself is held in a chuck or collet. It extends into the machine enclosure working as a cantilever. It can also be supported on the end - by the tail-stock.  

To distinguish a Swiss machine from others in its class - observe it's headstock move. A bar-stock passes through a chucking collet in the headstock - which clamps onto it.

Why Swiss Screw Machining So Valuable?

Swiss screw machining means that the bar emerges into the tooling area through a guide-bushing which locates the bar radially during machining. 

The headstock then moves very precisely back-and-forth in the z-direction - taking the bar with it.  The turning-tools carried on gang-slides contact the bar very close to the guide bushing.

The bar motion provides feed for this cutting action. Gang-slides carry holders for fixed single-point or other tools and may support live-tooling.  Many machines have a secondary spindle back, working tool stations and sometimes one or more turrets that carry more tools as well.

The purpose of supporting the workpiece with the guide bushing is to maintain precision throughout the machine workpiece. 

Any physical object subjected to a force - will deflect. On conventional lathes, if the cutting forces cause too great a deflection - the accuracy of the cut suffers.   If you hold a workpiece securely at one end - then push sideways on the unsupported end - the workpiece bends a certain amount.   Push with the same force on a longer workpiece - it will bend more. 

With Swiss screw machining - the guide bushing supports the workpiece so close to the tools - that the deflection due to the cutting force is essentially zero.  The result means you can take heavy cuts and still maintain precise dimensions on the part.

Swiss turning is used to make small, slender, complex and precision components.  This is possible due to unique design.  In the Swiss turning machine - the bar-stock material is gripped tightly and advanced by the sliding headstock through a guide bushing to the machining section. 

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The Convenience of Your Insert Molder Having the Capability to Produce Metal Inserts

When an insert molder has the capacity to produce metal inserts for vertical integration, the ease and convenience of having this capability cannot be underestimated.

Insert molding is part of a manufacturing process using advanced technology designed for injection molding, specifically. This process combines components of thermoplastic and metal into a single finished part.

Once completed, the part can be inserted into the mold automatically or by hand. When the plastic gets injected into the mold, it begins to fill in the features around the insert--which creates an incorporated and assembled component that is ready for use.

This process causes these components to be more tightly secured within the plastic resin and this helps to strengthen the part's reliability and it's resistance to vibration and shock.

Eliminate Extra Vendors With In-house Insert Production

It can be convenient if you find an injection molder that can produce the inserts, the mold and run production. Qualified engineers are able to guide this process with smooth results. It can be used for either low or high volume product runs.

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Swiss Screw Machining Solutions for Plastic & Metal Components

Precision Swiss screw machined components have had a major impact on the medical, aerospace and defense industry. In these industries, having the most precise components available is not an option – it’s mandatory. Any product manufactured for these industries must be created using the latest in accurate manufacturing technology in order to perform exceptionally.

Common Uses for Precision Swiss Screw Machined Parts

Medical, defense, safety and aerospace products rely on precision Swiss Screw machined components to operate in an exact and efficient manner.  These components can feature tight tolerances and high surface finishes that stand up to repetitive use while providing an exact fit. This type of manufacturing technology makes it possible to create accurate devices that operate for years. When it comes to these parts, accuracy is critical to the success of both the components and their users.

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