The frame and sash parts receive their end-face profile. This depends on the selected corner joint. There is a large number of different constructions with advantages and disadvantages in terms of strength, surface resistance, manufacturing process and production costs. The advent of CNC technology has opened up a wide range of possibilities here; the corner joints of the windows offered on the market today are correspondingly diverse.
The most widespread is the dowel joint or counter-dowel connection, where a combination of dowels and screws is used. In this processing step, the horizontal part of the joint is given a counter profile: this is the exact opposite of the later longitudinal profile of the vertical component. In the case of dowel connections, holes for the dowels and screws must be drilled, either in one operation with the milling of the profile or subsequently on another machine.
A more traditional method of corner connection, which is still frequently used today, is the slot-and-tenon joint. There are also corner joints with slotted holes and with additional mechanical components.
Single-sided profiling machine
Only one end face of the workpiece is machined. Each workpiece must therefore pass through the machine twice.
Double end tenoner
The double end tenoner processes both ends of the workpiece simultaneously. In this way, maximum precision and performance is possible.
Tenoning machine
This type of machine is especially suitable for slot-and-tenon corner joints.