hole thru into section - correct drawing note?
hole thru into section - correct drawing note?
(OP)
Hi. If I have a plate and with a hole through the plate, I put on the drawing 'M6 THRU'. That's clear.
But, if I have a box section and I want the hole to just go through the wall of the box section, what is the standard notation? I've previously stated 'M6 THRU SECTION WALL', but that sounds a little clunky.
Following on from that, if I have a fabrication of a 10mm plate welded onto the side face of a box section and I want the hole to go through the plate and the wall of the section then what's the notation? 'M6 THRU PLATE AND WALL OF SECTION'?
What if I actually want it to go all the way through? 'M6 THRU PLATE AND BOTH WALLS OF SECTION'?
What does the term 'THRU' actually mean? I normally take it to mean through to the next void. Is this correct?
But, if I have a box section and I want the hole to just go through the wall of the box section, what is the standard notation? I've previously stated 'M6 THRU SECTION WALL', but that sounds a little clunky.
Following on from that, if I have a fabrication of a 10mm plate welded onto the side face of a box section and I want the hole to go through the plate and the wall of the section then what's the notation? 'M6 THRU PLATE AND WALL OF SECTION'?
What if I actually want it to go all the way through? 'M6 THRU PLATE AND BOTH WALLS OF SECTION'?
What does the term 'THRU' actually mean? I normally take it to mean through to the next void. Is this correct?
Hobbs101
Mechanical Design Engineer





RE: hole thru into section - correct drawing note?
RE: hole thru into section - correct drawing note?
I'm going to adopt the 'one wall' terminology. Seems clear to me.
Hobbs101
Mechanical Design Engineer
RE: hole thru into section - correct drawing note?
I'd hope your take away would be to use a section whenever practical to clarify such matters.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: hole thru into section - correct drawing note?
Hobbs101
Mechanical Design Engineer
RE: hole thru into section - correct drawing note?
I've seen instances of it being misunderstood and hence don't like it.
Obviously if you share 3D CAD date, even only as reference, this concern may be reduced.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: hole thru into section - correct drawing note?
Hobbs101
Mechanical Design Engineer
RE: hole thru into section - correct drawing note?
If the hole goes thru, but it's not entirely clear from the view, then you can state that the hole is a "THRU" hole... However, in some cases, where your hole only goes through one wall, and not the other, or any situation similar, best practice is to show a section view and dimension the depth of the hole directly. Don't allow (incorrect) interpretation, by removing all doubt whenever possible.
Mod
RE: hole thru into section - correct drawing note?
RE: hole thru into section - correct drawing note?
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: hole thru into section - correct drawing note?
RE: hole thru into section - correct drawing note?