Their production - depending on their shape and size - is made on the cutting table or with milling tools.
As to their function, they usually ensure that the glass can be installed, i.e. they give the final functional shape of the glass according to its purpose, and serve as a place for the fixings in the corners.
Fine polishing of the corners can also be done by grinding technology, that is the corners may be gounded or cut off. These operations are not considered corner cutouts (see: Polish).
Restrictions on dimensions and positions:
- The size of the corner cutout (w/h) cannot exceed 1/3 of the width or length of the glass
- The inner corners of the cutouts should be rounded, with the min. radius r = 6mm.
Size tolerances in cutout size:
- Maximum permissible deviation of cutout dimensions (w/h): ± 3mm.
Dimensional tolerances in the position of the cutout:
- When measuring the location of the cutouts, a starting point must be selected at one corner of the glass, and along perpendicular lines, measure the distance of the selected reference point of each cutout from the starting point.
- For glass with a maximum length of 2000 mm, the tolerance is ± 2,5 mm,
- For glass with a maximum length of 3000 mm, the tolerance is ± 3 mm,
- For glass with a length above 3000 mm, the tolerance is ± 4 mm.
- Above 12 mm glass thickness the tolerances increase by 1 mm.
Possible edge processing of the cutouts:
If the ø65 diameter polishing tool can go along the edges inside the cutout, it is possible to polish the edges P-FMF (see: Polish). With these kinds of cutouts occasionally other types of edge processing may be done, depending on the shape of the glass lite, its center of balance and other parameters. In case otherwise instructed by the client, the edges of the cutouts remain polished with the M-FMF.
In addition to the above restrictions, the tempering of the cutout glasses has separate - based on experience – limitations (see: Tempering Tempering conditions). During the fixings, or even during intended usage, along the edges of the cutouts tension may increase in the glass, leading to glass breakage. In accordance with the limitations of tempering cutout glasses, CE GLASS recommends the tempering of such glass lites, reducing the risk of glass breakage!