What does a cutting-plane line with arrowheads at its ends tell the reader?
- Where the part is to be flame cut and in which direction
- Where a section is taken and the direction it is viewed from
- Where two parts meet and which is welded first
- Where a dimension starts and where it ends
Show the answer
B. Where a section is taken and the direction it is viewed from
A cutting-plane line shows the imaginary cut used to create a section view, and its arrows point in the viewing direction. It is a drafting convention, not a cutting instruction for the shop.
Reference: ASME Y14.2, Line Conventions and Lettering: cutting-plane lines; ASME Y14.3, Orthographic and Pictorial Views: section views
In a section view, what do the thin, evenly spaced diagonal lines (section lining) show?
- Surfaces that must be ground or machined
- Areas that are to be covered with weld metal
- Open space where no material is present
- Solid material that the cutting plane passes through
Show the answer
D. Solid material that the cutting plane passes through
Section lining (hatching) fills the surfaces where the imaginary cutting plane slices through solid material. Holes and voids in the cut are left blank.
Reference: ASME Y14.2, Line Conventions and Lettering: section lining
A drawing shows a long beam with a pair of freehand zigzag lines across it and a length dimension much greater than the drawn length. What do the zigzag lines indicate?
- Part of the length has been left out of the view to save space
- The beam is to be cut into two pieces at that location
- The beam has a field splice to be welded at that location
- The beam is cracked and must be repaired at that location
Show the answer
A. Part of the length has been left out of the view to save space
Break lines show that a portion of a long, uniform part is not drawn. The written dimension still gives the true full length. They are not a cut or splice instruction.
Reference: ASME Y14.2, Line Conventions and Lettering: break lines