What are the general tolerances followed during sheet metal design? How to determine sheet metal tolerances?
Tolerance Guidelines From custom metal box manufacturers
A part tolerance is a dimension that is not marked with a tolerance during the design and manufacture of the part.
It also refers to those dimensions that are not included in the dimensional chain and have no direct effect on the fit properties.
From the definition of tolerances, part tolerances have an important influence on the dimensional fit of parts in mechanical design.
If part tolerances are not correctly selected, the part design dimensional chain will be incomplete.
In the process of labeling tolerances, some parts with low accuracy requirements can use general tolerances.
If the requirements for accuracy are very high, the tolerances should be specified in detail in the mechanical design.
Make sure that the tolerances of the part can meet the actual needs.
The function of a part determines the size, shape, position and other requirements of its corresponding elements.
Tolerance grades should be selected to ensure the design and quality requirements of the part.
Machining costs, product performance, function, service life and fuel consumption should also be considered.
Forming or bending +/- 0.508 mm (0.020″)
Bend to hole +/-0.254 mm (0.010″)
Diameter with inserts +/- 0.0762 mm (0.003″)
Angle +/- 1°
Hole +/-0.127 mm (0.005″)
Edge to edge ±0.127 mm (0.005″)
Edge to hole ±0.127 mm (0.005″)
Hole to Hole ±0.127 mm (0.005″)
Hole to hardware ±0.254 mm (0.010″)
Edge to hardware ±0.254 mm (0.010″)
Hardware to hardware ±0.381 mm (0.015″)
Fold to Hole ±0.381 mm (0.015″)
Fold to hardware ±0.381 mm (0.015″)
Fold to edge ±0.254 mm (0.010″)
Fold to fold ±0.381 mm (0.015″)