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  1. #1
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    Default Drafting Standards Question

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    Ok... so I have seen on some drawings that the draftsman will add "First Angle Projection", "Third Angle Projection", that time of thing to assist the viewer in understanding what they are looking at.

    I am adding a circle with 0, 90, 180, and 270 degree locations with centermark to make sure whoever is viewing knows those directions for all holes on the drawing.

    What is that type of thing called? A Compass, a datum.... I have no idea and can't find it in any of my books or can't google because I don't know what its called.

    Any ideas?

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    Senior Member lrm's Avatar
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    I think the term you are looking for is "compass rose".
    For example, https://www.shutterstock.com/image-v...white-40971652

    There are standard symbols to indicate whether a drawing is 3rd angle (USA and Australia) or 1st angle (ROW aka Rest of World). Google "3rd angle projection symbol".

  3. #3
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    Can we see what the drawing looks like?
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  4. #4
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    I can't post company drawings. Maybe I'll draw one up and put it up here later that isn't a job drawing.

  5. #5
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    Irm's answer wasn't what you were looking for?

    What kind of drawings are we talking about?
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  6. #6
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    I did use Irm's. I just have this funny feeling there is a more technical drafting term as a "compass rose" is used for maps and globes.

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    What kind of drawings are we talking about?

    Are you showing all the typical views one might expect to see such as top, front, side and isometric?
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  8. #8
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    Its basically a 5x5x0.5" block of metal with 5 holes drilled from front face to bottom face. And due to the amount of different details on the drawing I didn't want to add 0, 90, 180, 270 to each (or one) of those holes. So bottom left corner of paper gets a compass rose. But drawing had Front Face, Side view, and other specific detail. Sorry I have to be vague.

  9. #9
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    Instead of Front Face, I should have said top face. So they are drilled straight through from Top to Bottom (the thickness of the plate).

  10. #10
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    I guess I'm just not understanding the need for the 0, 90, 180, 270 markings. Wouldn't the center of each hole be indicated by distances from the centerlines of the plate?

    I do tank fabrication drawings and we locate nozzles on the top, bottom (where applicable) and sides of a tank using a degree circle because when the tank is placed in the field the nozzle positions are critical for matching up with existing and new piping.
    "I have only come here seeking knowledge. Things they wouldn't teach me of in college." The Police

    Eat brains...gain more knowledge!

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