How To Note Flatness Sheet Metal Drawings

Toggling the visibility of bend region lines.

How to note flatness sheet metal drawings. Note that the flatness tolerance must be less than the size tolerance associated with the surface. Bend tags associate rows in a bend table with the view geometry. Flat pattern drawing views can display bend line notes or bend tables. I systematrically specify bend radii on my drawings and i include details showing what the bend corners look like before bending.

Toggling the visibility of bend lines. I don t put any standard notes on my sheet metal drawings. The flatness control c defines how much a part s surface may deviate from its perfect flat form. No mmc or lmc applicable.

Flatness is a form control. Yes new in 2009 drawing callout. The flatness control c defines how much a surface on a real part may vary from the ideal flat plane. The left figure shows the drawing callout.

After you insert the bend table in the drawing bend tags are added to the selected drawing view automatically. 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. To control the bow try using straightness applied to your sheet metal gauge thickness feature of size. Bending factors affect the flat pattern.

Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage. The flat pattern drawing doesn t always list these factors. I am apply my dimensions carefully so that they are unambiguous. I have read up on and taken a course on the asme y14 5m 1994.

Toggling the visibility of sheet metal bend notes. For door panels front panels interior panels and racks see document 10 1006 for information on adding a note regarding the implementation eps 121. I want stress relief radii. Creating drawings of flat patterns.

It is a common symbol that references how flat a surface is regardless of any other datums or features. Bend tags are formatted by the dimension style and do not have a leader by default. Sheet metal bend line notes. 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.

Gd t flatness is very straight forward. Minimum bend reliefs allowed. Although notes on each drawing will differ the first note on all sheet metal drawings that contain bends should be as follows. Unless you need the part to have a flatness that is better than the sheet metal gauge tolerance.