Tool spindle serving against splinters in the lengthwise processing of workpieces, which is located before the working spindle. To ensure protection against splinters, it has to work in down-cut with the same tool profile as the working spindle. Each time, about the last 50-100 mm this spindle dives into the workpiece with the appropriate tool to prevent tearing at the edges.

Working procedure when working with the down-cut spindle, explained at the example of a Gubisch outside profiling and moulding machine.

Figure 1

Push frame in feed direction until the second feed roller records the frame. When lifting the feed roller, a limit switch is pressed, which lowers the lifted feed rollers 1 and 5-7. At the same time, the chosen spindles (here the second spindle as profiling spindle) come forward.

Figure 2

The frame is milled, e.g. spindle 2 mills the double rabbet in up- cut, spindle 3 mills the fitting groove, spindle 4 holds the tool for the water nose, which is not necessary for this milling process.

Figure 3

After the second feed roller is lowered at the rear edge, an adjustable time runs, after which the first spindle is used in down-cut.

Figure 4

After lowering of the third feed roller, the first spindle goes back into its initial position. The feed rollers rise and the frame can be removed.

Applications

• Double end tenoner, e.g. alternate milling aggregate, company Homag
• edgebanders: down-cut spindle in the premilling unit
• Edge processing machines: Formatting part
• Outer profiling and profiling machines
• Angle plant for window production: lengthwise processing