Swiss CNC Machining

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Precision Swiss CNC machining services are our specialty at Runsom. We are an industry leader in Swiss-type machining by the use of the most advanced technologies and equipment, allowing us to produce high-quality precision turned parts. We can offer you suitable cost-effective solutions no matter how complex your desired microcomponent is.

What Is Swiss CNC Machining?

Swiss CNC machining is a specialized process to machine small, high precision turned parts. A Swiss CNC machine, also referred to as a Swiss automatic lathe, Swiss screw machine, or Swiss-type lathe, was originally designed for the Swiss watchmaking industry. Over the years, the Swiss-style turning machine, has been refined to be widely used in various industries for high-volume, high-precision manufacturing – and for good reason.

A Swiss-style lathe is a type of machine that cuts bar stock fed through a guide bushing while the tools keep stationary. The collet is recessed behind the guide bushing so that the bar stock held in it will have better support and will not directly be exposed to the lathe bed and the tooling, so the machine can process the material rapidly and tightly. Also, it plays a great role in decreasing tool deflection and vibration while increasing parts accuracy since the cutting tool can work nearer to the bushing.

The Explanation of How A Swiss-type Lathe Works

How Does A Swiss-type Lathe Work?

A conventional turning machine has a fixed headstock that holds the spinning workpiece when a cutting tool moves across to machine the outer diameter. However, in a Swiss CNC turning center, it employs a sliding headstock that feeds bar stock through a guide bushing in the Z-axis towards the stationary cutting tool.

In the turning operation, clamped onto the chuck or collet in the headstock, the bar stock is located radially and precisely. The headstock moves back and forth along the z-axis, taking the bar stock with it. The turning tools, carried on the gang slide, always engage the bar stock close to the bushing, usually within 1 to 3 mm, thus providing the greatest degree of support and decreasing vibration and tool deflection consequently. And continuous feeding is achieved by the movement of the spindle and the supply of the guide bush.

Swiss-type Turning

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Conventional CNC Turning

When it comes to fabricating precise components, there are inevitably distinct differences between CNC Swiss and standard CNC machinery. Each type of the machine can make sophisticated components with high levels of accuracy and productivity for a wide range of tasks and businesses.

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1. Headstock 2. Guide bushing 3. Cycle time 4. Coolant type 5. Reversed offset 6. Machining in segments

1. Headstock

Movable Headstock in Swiss CNC Machine

Compared with a conventional lathe with fixed headstocks where the workpiece is clamped in a chuck or collet and extends to the enclosure of the machine as a cantilever or can be supported on the one end with a tailstock, the Swiss CNC turning machine has movable headstocks.

2. Guide bushing

The guide bushing in Swiss CNC Machine

In conventional turning, the workpiece is stabilized in the chuck of the main spindle, which tends to cause the part to deflect from tool pressure when the ratio of length to diameter gets beyond 4:1.

While during Swiss machining, the workpiece is clamped in a collet that can slide along the headstock behind the guide bushing, allowing the cutting tool to operate near the guide bushing. Such mechanical configuration eliminates deflections when machining, so when producing precise parts with desired tolerances, Swiss CNC turning can come into play, despite the length of the workpiece.

3. Cycle time

Reduced Cycle Time Using Swiss-type Lathes

Modern Swiss-type lathes function 5-axis control or more axes and can run multiple operations on the part in a single machining cycle, such as drilling, slotting, thread cutting, end-face grooving, milling, cut-off, and back drilling in a single run.

In comparison, conventional lathes usually feature 3 or 4 axes and are not able to complete machining a part in a single cycle. Due to that, some mildly complex parts may need machining on multiple machines, drastically increasing cycle time and decreasing precision.

4. Coolant type

Swiss-type CNC machines Use Oil as a Coolant liquid

Swiss-type CNC machines use oil as a coolant liquid rather than water. The benefits of the use of oil are shown in many aspects, including the greater lubricity, free from the prune-like hands owing to exposure to water-based coolant all day, and from odor-causing bacteria growth.

However, compared to water, the main shortcoming of oil is less effective at dissipating heat. Therefore, it is prudent to equip the machine with a fire-suppression system.

5. Reversed offset

6. Machining in segments

Swiss CNC turning machining in segments

On conventional lathes, turning is done procedurally as roughing pass, finishing pass then, then machining of features such as OD grooves or threads to complete the part.

As for Swiss CNC turning, due to the length of the guide bushing, machining in segments has to be done to guarantee the final part dimensions are within the desired tolerances. Its machining sequence might go: OD turn up to the location of a groove, machine that groove, bring back the previous tool to resume OD turning, and so on.

The Key Benefits of Swiss CNC Machining

The good performance of Swiss CNC machining greatly benefits from the guide bushing and the geometry and mechanics that take place in the tool zone.

The chip-to-chip time from one tool to the next can be one second or less because the cutting tool operates near the guide bushing;
Capacity for 20 or more tools in the tool zone;
Shorter set-up times;
Often a single heavy cut helps to remove all the necessary material while preventing deflection;
Superior surface finish without the need for grinding;
Complex parts can be machined in a single cycle with more accuracy;
Multiple operations on the part in a single machining cycle, making it possible for the parts come off the lathe ready to ship;
Optimization of productivity-the right automatic bar feeder enables continuous, unattended, and even lights-out operation;
Tighter tolerances are realized by the sliding headstock & the guide bushing.

Runsum Swiss CNC Machining Capabilities

Processing of shaft parts at Runsom

Runsom's Swiss CNC turning services support lots of industries

Material types & size range of Swiss CNC machining at Runsom

Processing of shaft parts

The outer circle, drilling, boring, end face, turning threading, cutting slot, cutting off, tapping, etc.

Served industries

Slender shaft parts or complex parts machined by Runsum Swiss CNC turning usually can be found in medical, aviation, aerospace, military industry, automobiles, motorcycles, communications, refrigeration, optics, appliances, electronics, clocks, and toys industry, where high precision and efficient manufacturing is demanded.

Material types & size range

Size range: 0.010" to 0.750" Diameter.

Material	Type
Aluminum	2011, 2024, 6061, 7075
Brass	C360, C53, C464
Copper	C145, C544, C792, C97
Plastic	Acetal, Delrin, Peek, Kel-F, Ultem
Stainless steel	303, 304, 316, 416, 430F, 17-4PH
Steel	12L14, 1018, 4140, 1215

1. Productivity

High production work can be achieved by the automatic feeder designed to run lights-out and produce parts unattended. It can be expected to hold size with no variance while leaving a Swiss lathe running overnight without human involvement.

2. Cost saving

Compared with the high cost production that comes with traditional turning, our Swiss CNC machining service provides you with a cost-saving and efficient solution for your demand.

Efficiency of Runsom's Swiss CNC Turning

3. Efficiency

Runsom is equipped with Swiss CNC lathes that have a sub-spindle that allows live tooling work to be done on the back side of one part simultaneous to the front size of another part, essentially cutting in half the cycle time.

4. Quality

Runsom Swiss CNC lathes sit on an integrated casting bed, offering shock resistance and temperature stability. And our engineers have been experienced in Swiss turn operation for several years.

Therefore, your design will be realized from the idea to put into production with high accuracy under the support of our excellent machines and teams.