How To Note Flatness Sheet Metal Drawings

Yes new in 2009 drawing callout.

How to note flatness sheet metal drawings.

The boxed symbols can be read this surface must lie between two parallel planes spaced 0 2 apart in all views the right figure shows a possible actual part condition. I systematrically specify bend radii on my drawings and i include details showing what the bend corners look like before bending. To put a flatness on sheet metal part will be hard to control because of the stock sheet metal gauge size tolerances are relatively nice and tight. Toggling the visibility of bend region lines.

Bending factors affect the flat pattern. Note that the flatness tolerance must be less than the size tolerance associated with the surface. Flatness is a form control. After you insert the bend table in the drawing bend tags are added to the selected drawing view automatically.

Minimum bend reliefs allowed. I don t put any standard notes on my sheet metal drawings. Sheet metal bend line notes. Creating drawings of flat patterns.

No mmc or lmc applicable. For door panels front panels interior panels and racks see document 10 1006 for information on adding a note regarding the implementation eps 121. Although notes on each drawing will differ the first note on all sheet metal drawings that contain bends should be as follows. I am apply my dimensions carefully so that they are unambiguous.

The flatness control c defines how much a part s surface may deviate from its perfect flat form. The flat pattern drawing doesn t always list these factors. To control the bow try using straightness applied to your sheet metal gauge thickness feature of size. Flat pattern drawing views can display bend line notes or bend tables.

The flatness control c defines how much a surface on a real part may vary from the ideal flat plane. Bend tags associate rows in a bend table with the view geometry. Gd t flatness is very straight forward. Toggling the visibility of bend lines.

Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage. Unless you need the part to have a flatness that is better than the sheet metal gauge tolerance. A bend table lists propertied of all bends in a flat pattern view of a sheet metal part. Perfect flatness is when all points of a surface lie in the same plane.

I want stress relief radii. It comes in useful if a feature is to be defined on a drawing that needs to be uniformly flat without tightening any other dimensions on the drawing. The left figure shows the drawing callout. Bend tags are formatted by the dimension style and do not have a leader by default.