ANSI 14.5 Hole Notes

[tim-tim]

Leah,

1.8.10 Round Holes
Round holes are dimensioned as shown in Fig. 1-36.
Where it is not clear that a hole goes through, the notation THRU follows a dimension. Where multiple features
are involved, additional clarification may be required.
The depth dimension of a blind hole is the depth of the
full diameter from the outer surface of the part. Where
the depth dimension is not clear, as from a curved surface, the depth should be dimensioned pictorially. For
methods of specifying blind holes, see Fig. 1-36.

I have attached an example from the spec for you to review as well.

There are many different standards to "draft" to, all mean the same thing, just different verbage. For example, if you had three thru holes that were 1/4" and wanted to maintain 0.005", it would appear as:
3X Ø.250 THRU

Hope this helps,
-Tim

[TroyCDH]

Hi Leah,

I have attached a jpeg for you to look at. The term "Thru All" is out of date for drawings. ANSI & ASME have been creating standards that are more consistent with the global industry. Minimize text and increase symbols. I have the ASME Y-14.5-2009 book and I do not see the term "thru all" anyplace.

That said, it is still a very common practice here in the U.S. to see "Thru All' on new drawings. Assuming the drill bit is long enough to cut thru all or "thru both walls" (another common term) it covers the one motion of the drill press or milling machine. There is no x-y location movement to a second hole.

3D CAD designers are also very use to the term "thru all" for creating cuts/holes as well.

So either call out will work. If you do not know your audience (the machinist) I would side with ASME Standard. Clarification can be helped by showing your ISO view at an angle to show both holes. A section view could be shown as well but that will make for a busy drawing when the ASME "2X" will do.

Troy