Types of Undefined Edge:
The symbol element + (plus) indicates permitted excess material, i.e. passing.
The symbol element – (minus) indicates required material removal, i.e. undercut.
The symbol element ± (plus or minus) indicates permitted excess material or material removed, i.e. an undercut or a passing. This can only be used with an indication ofsize
Table 1 — Symbols for the shapes of edges
Figure 1 — Undercut on an external edge
Key
1 ideal sharp edge
2 undercut
Figure 2 — Examples of undercut on an external edge
Figure 3 — Undercut on an internal edge
Key
1 ideal sharp edge
2 undercut
Figure 4 — Examples of undercut on an internal edge
Figure 5 — Passing on an external edge (flash or burr)
Key
1 ideal sharp edge
2 passing
Figure 6 — Examples of passing on external edge (burr or flash)
Figure 7 — Passing on an internal edge
Key
1 ideal sharp edge
2 passing
Figure 8 — Examples of passing on an internal edge
Indication and associated meaning for undefined edges
