Notation Flatness Sheet Metal Drawings

Ref harv french thomas e.

Notation flatness sheet metal drawings.

It is also shown folded in the view palette which is not normal. The part flattens fine in the model when selecting the flat pattern icon. I ve done this hundreds of times without issue. No mmc or lmc applicable.

Ref harv asme 2007 y14 38 2007. Abbreviations and acronyms for use on drawings and related documents asme. Engineering drawing standards manual mechanical engineering branch goddard space flight center greenbelt maryland august 1994 n a t i o n a l i a e r o n a u t i c s a n d s p a c e a d m i n s t r a t i o. The flatness control c defines how much a surface on a real part may vary from the ideal flat plane.

If you tell them to do 005 they are either going to ingore your tolerances or they are going to have to clean things up. Perfect flatness is when all points of a surface lie in the same plane. The left figure shows the drawing callout. Yes new in 2009 drawing callout.

Revision of engineering drawings and associated documents asme archived from the original on 2013 04 14. 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. When i create the drawing and want to pull in the flat pattern view it comes in folded.

Sheet metal shops can bend to around 015 accuracy. The flat pattern can be used to document and manufacture associatively as the design changes. As you create flanges and add bends the sheet metal design software will accurately represent the flat pattern required. Sheet metal design software considers the fabrication methods needed for manufacturing.

X 673 64 1f goddard space flight center greenbelt maryland engineering drawing standards. 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. My biggest problem with other people s sheet metal drawings is that they use drawing templates designed for machined parts showing standard machining tolerances. It is a common symbol that references how flat a surface is regardless of any other datums or features.

1953 a manual of engineering. Flatness tolerance applies in all drawing views not just the view showing the tolerance callout. Hi i am working on sheet metal part drawing i placed flat pattern on the drawing but didn t show bend line i don t know why i worked sheet metal drawing before it was ok i am using 2012 version.