The long sides of the frame and sash parts receive their profile. Any tear-offs that may have occurred during end processing are milled away, so the longitudinal machining always takes place after the transverse machining.
With some window profiles, the resting area is very narrow after this machining step. Therefore, the parts do not stay straight, but rather tip over sideways. This increases the complexity of production, as it makes it much more difficult to manipulate and stack the parts. In the case of dowelled corner joints, the dowel holes must be inserted in a further step.
Glazing bead planing: Glazing bead profiles are available ready-machined on the market. However, since suitable dimensions fall from the window scantlings during sash production, it is common practice to produce the glazing beads from them. To do this, the longitudinal profile is first milled from the raw material that was sawn out of the window scantlings during four-sided planing. In window production, one machine can be used both for the longitudinal profiles on sashes and frames and for the glazing bead profiles.
Moulding machines process all four long sides in one pass, i.e. they have at least four spindles - but in the high performance range this can be more. For efficient production, operation and fast tool change are crucial.