Sheet metal is often controlled with flatness tolerance.
Flatness tolerance for sheet metal.
Since rolled alloys also levels this product we work to the mill tolerances.
The flatness control c defines how much a surface on a real part may vary from the ideal flat plane.
In general sheets 60 wide and under are to be no more than out of flat when laid on a flat surface.
Practical tolerances vary according to the design requirements.
Linear tolerances should be held as loose as possible.
Flatness tolerance is the permissible distance between two parallel planes within which all irregularities of a given surface must lie.
This not only control the rock but also the allowable mechanical stress which deform the shape of the sheet metal like in case of parts that will be welded thermal stress bolted bending due to too much torque or screwed.
Maximum difference between aa and bb up thru 12 over 12 3 32 x width ft 2 9 64 x width ft 2 5 64 x width ft 2 7 64 x width ft 2.
The distance between the parallel planes is the stated flatness control tolerance value.
Flatness tolerance is always less than the dimensional tolerance associated with it.
0 0129 0 33 aluminum sheet metal tolerances table chart.
Tolerances of 010 should be considered minimum.
And for machined components iso 27 68 fh can be used.
Parts may be measured in either unrestrained or restrained conditions.
For material 10 or less in length variation should not exceed amount shown in table.
Flatness tolerances listed are of roller leveled sheets or plates with no or minimum margins.
Note any feature requirement comes with price tag on it.
Tight tolerances raise the cost of manufacturing significantly.
The flatness tolerance zone is the volume between two parallel planes.
Plates can be out of flat for a number of reasons.
General tolerance iso 2768 does not specify where to use these tolerances.
Two sets of parallel planes where the entire referenced surface must lie.
As per design requirements and manufacturing capability tolerance class is defined.
Mm 48 1 219 in.
Squareness tolerances flat sheet and plate.
For material longer than 10 the variation in flatness for any 10 feet of length should not exceed the amount shown.
Recommended limits are applicable to parts measured in the unrestrained condition flatness tolerances for metal stamping.
In the above example m and k has defined the tolerance class.
Specified width ft.
Sheet metal tolerances should not be tighter than necessary to make the part functional.
Flatness tolerances for sheet are published only for full size sheets.