How To Note Flatness Sheet Metal Drawings

Toggling the visibility of bend region lines.

How to note flatness sheet metal drawings.

Bending factors affect the flat pattern. 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. Sheet metal bend line notes. Note that the flatness tolerance must be less than the size tolerance associated with the surface.

I want stress relief radii. I have read up on and taken a course on the asme y14 5m 1994. A bend table lists propertied of all bends in a flat pattern view of a sheet metal part. Gd t flatness is very straight forward.

Flat pattern drawing views can display bend line notes or bend tables. I don t put any standard notes on my sheet metal drawings. Bend tags are formatted by the dimension style and do not have a leader by default. 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. Perfect flatness is when all points of a surface lie in the same plane. No mmc or lmc applicable. To control the bow try using straightness applied to your sheet metal gauge thickness feature of size.

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. Unless you need the part to have a flatness that is better than the sheet metal gauge tolerance. Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage. The left figure shows the drawing callout.

I am apply my dimensions carefully so that they are unambiguous. The flat pattern drawing doesn t always list these factors. Bend tags associate rows in a bend table with the view geometry. Toggling the visibility of sheet metal bend notes.

The flatness control c defines how much a part s surface may deviate from its perfect flat form. Toggling the visibility of bend lines. Creating drawings of flat patterns. 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 flatness control c defines how much a surface on a real part may vary from the ideal flat plane. For door panels front panels interior panels and racks see document 10 1006 for information on adding a note regarding the implementation eps 121. After you insert the bend table in the drawing bend tags are added to the selected drawing view automatically. Yes new in 2009 drawing callout.