Topic: annotate "level"

[Bethrine]

How would you annotate that two ends of a bent plate are level to each other. For instance, the top of the letter V, the ends at the top are level to each other. Any suggestions?

[mjfarrell]

I would suggest a datum line - and the elevation noted

http://www.globalspec.com/reference/43797/203279/chapter-6-datum-symbols

[Bethrine]

Thank you! I have been meaning to study up on datums...guess now's the time.   

[Bethrine]

I am thinking the symbol for straightness? I have a V shaped plate and the tops are level once it is placed.

(The things paying for my education would get me!!! )

[mjfarrell]

to be clear....

[Bethrine]

My V shaped plate looks like the "not this" one.  I am required to draw them as they are made and that is how it is made. 

[mjfarrell]

then your 'straightness' symbol would be incorrect....a it would imply the 'this' condition.


Perhaps best to define the angle of that plate, and the angle at which it is mounted about it's center line
as well as the elevation of the bottom

[Bethrine]

The more you know, the easier it is to think outside the box.  Excellent!! Thank you mj!

[Kerry]

Bethrine,

You nominate a 'Bent plate'

How is it bent ?
I assume the vertex will NOT be sharp as you have depicted. It is physically impossible to 'bend' plate with a sharp vertex.
Plate is bent with an internal radius that translates to the outside. The minimum effective radius is determined by the thickness and material.

Regarding dimensioning ..
What is the critical criteria ?
.. the horizontal distance between inside corners ?
.. the enclosed angle ?
.. the overall height ?
.. the leg distance ?
.. the internal radius ?
.. the plate length prior to bending ?

that is what you want to dimension.

added:
Regarding annotation.
The object will be symmetrical about the vertical centerline ? yes ?

[Bob Garner]

Perhaps it is an extrusion and not bent?

[Kerry]

Words have meaning Bob.

[Bob Garner]

Whoops    Sorry

Or you could describe it by the process: "Grind ends level to each other as shown".

[Bethrine]

Bethrine,

You nominate a 'Bent plate'

How is it bent ?With a sheet bender
I assume the vertex will NOT be sharp as you have depicted.No. It is physically impossible to 'bend' plate with a sharp vertex.Agreed
Plate is bent with an internal radius that translates to the outside. Yes.The minimum effective radius is determined by the thickness and material.Yes

Regarding dimensioning ..
What is the critical criteria ?
.. the horizontal distance between inside corners ?
.. the enclosed angle ?
.. the overall height ?
.. the leg distance ?
.. the internal radius ?
see pic for the needed dimensions of the above
.. the plate length prior to bending ? I also have a flat pattern annotated with additional measurements not noted in the below piccy

that is what you want to dimension. 

added:
Regarding annotation.
The object will be symmetrical about the vertical centerline ? yes ? yes

The second annotation object is for assembly and is where I would like help (although I am never against good advice). mj, did I do that right? I've been all over the net on datums and, well, yuck.
The arrow cut off to the left is a callout.

[mjfarrell]

looks good, only thing that could be added would be symbol for symmetry about CL

[Krushert]

IN your second screen capture I would add a vertical dimension from your bent plat back to the other assembly/part; so that you can control height  after installation, especially if you are welding the parts