Tolerances and size designations › Quotation language › Design information › Alinco: Aluminium, Inox en Metaalconstructie

Alinco works according to EN 1090 EXC2 tolerance tables, but processes your materials as well as possible. In most cases, the tolerances will even be well below the requirements of EN1090 EXC2.
Different tolerances and critical dimensions should be indicated separately as dimensions on the drawing. We do not take into account general tolerances stated in title blocks (which are sometimes not even meant for sheet metal).
For the attention of draughtsmen: please, specify as few bending radii as possible yourself; if we do not have to adhere to logical bending radii, this only takes more time in our production process. In a number of cases this also simply does not work and we do not take them into account (except for large bending radii – obviously, we will no longer bend with an R3 a requested R25). We reserve the right to use a different bending radius; this is also stated on our quotation: deviation +/- R3 possible. With a clearly different radius (e.g. R20 or R50), the correct radii are of course applied, but a deviation of +/- 3 still remains possible here (so R50 can fluctuate between R47 and R53).
For an important measure a tolerance may be specified, but please avoid being too generous or too restrictive with it. Here too, it is sometimes not possible to adhere to narrow tolerances in sheet metal or, for example, a few test pieces need to be bent first with all the additional costs involved. When tolerances are too narrow, we sometimes specify ‘tolerances for sheet metal not feasible; we are doing this as well as possible’.
Perforated plates do not retain their shape upon bending; folds spring back to the weakest point. Calculate a wide tolerance in the bending and further processing of perforated plates.