Swiss Type Automatic Lathe SB-12R type G Newly Released
A Model with G.B/N.G.B Switching Function Added to the Bestselling SB Series Aimed at Machining of Small-Diameter Workpieces
|SB-12R type G|
|Max. machining diameter||ø13mm|
|Max. headstock stroke||205mm|
|Max. main spindle speed||15000 min-1|
|Main spindle motor||2.2kw / 3.7kw|
|Max. sub spindle speed||12000 min-1|
|Sub spindle motor||0.55kw / 1.1kw|
|Max. power-driven att. spindle speed||ER11||10000 min-1|
|Power-driven att. drive motor||1.0kw / 1.2kw|
|Max. drilling capability on the front-end||Stationary tool||ø10mm|
|Max. tapping capability on the front-end||Stationary tool||M10×P1.5|
|Max. drilling capability on the rear-end||Stationary tool||ø8mm|
|Max. tapping capability on the rear-end||Stationary tool||M6×P1.0|
|Dimensions (W x D x H)||2,070 x 1,177 x 1,760 mm|
NOTE 1: Swiss-type automatic lathe
The Swiss-type automatic lathe was devised as watch component processing machinery in Switzerland in 1870s. Known as a “sliding head-type automatic lathe” as well, it has remarkable characteristics of high-precision cutting of components with longer length compared with the diameter.
In general, if long and narrow parts are processed with a general-purpose lathe, flexure will occur on the workpiece, making finishing with the correct dimensions impossible. The Swiss-type automatic lathe utilizes a guide bush to function as a material steady rest. The tool, positioned at a certain distance from the guide bush, gives a cutting motion only the direction of outside diameter. This allows the workpiece to be cut accurately with no flexure. As for axial motion, the headstock, rather than the tailstock, moves while clamping a workpiece.
NOTE 2: Non-Guide Bush Type
This is a sliding head-type automatic lathe which is designed based on the Swiss-type automatic lathe with a guide bush dismounted. Without a guide bush, it is not best suited for machining narrow and long parts. If the workpiece is short and does not deflect without using a guide bush, however, such a material can be handled effectively.
With the Swiss-type automatic lathe, the rear side of the bar material needs to be handled as waste as a portion equivalent to the size of the guide bush structure which functions as a material steady rest cannot be machined. The non-guide bush type reduces the wastes from materials to about 1/3 in length compared to the waste made by the guide bush type.
NOTE 3: Slanted slide guideway structure
The machine main body base and the tool post are slanted and each sliding surface is in a trapezoidal shape, called a dovetail structure. This structure allows each sliding surface to come into contact with its entire plane to improve the machine rigidity. The ball screw center and the cutting point are close to each other to reduce a load (moment load) applied in the direction of torsion caused by cutting resistance.