THRU, THRU ALL and Continuous Feature
THRU, THRU ALL and Continuous Feature
(OP)
I recently asked this quest in the Y14.5 yahoo group and got some interesting answers. Here's the question: I was just curious in seeing what is currently being done by others with the use of "THRU" on cut features. When is it necessary (if at all). What is the difference between "THRU" (whether necessary or not) and "THRU ALL". And, has anyone starting useing the boxed CF symbol (continuous feature) from ASME Y14.5-2009 (and how)?
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group





RE: THRU, THRU ALL and Continuous Feature
To me THRU, unless qualified, means through the entire part. Occasionally I've seen it qualified with 'THRU ONE WALL' or similar but don't like this, I prefer to show a section that explicitly defines such matters. As such THRU ALL is not something I think I've ever used, if in doubt I'll show a section.
Not using 2009 yet. I could have sworn I'd seen THRU in 14.5-1994 but I can't find it now.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: THRU, THRU ALL and Continuous Feature
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: THRU, THRU ALL and Continuous Feature
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: THRU, THRU ALL and Continuous Feature
Out of the box SolidWorks default uses THRU ALL.
Chris
SolidWorks 09 SP4.1
ctopher's home
SolidWorks Legion
RE: THRU, THRU ALL and Continuous Feature
So, suppose you have a shaft with a radial groove in it for an o-ring. If the shaft OD is a datum feature or geometrically controlled surface, the CF symbol shows that the datum feature or geometrically controlled surface is of a length that's as if the radial groove were not there. There's an example in the standard. I don't have it in front of me at the moment.
It's doubtbful that it's a proper substitute for "Thru one wall" for "Thru All" in a designation for a hole.
RE: THRU, THRU ALL and Continuous Feature
But where I work now, it's common practice to indicate THRU where a depth would normally be in the hole note.
RE: THRU, THRU ALL and Continuous Feature
Chris
SolidWorks 09 SP4.1
ctopher's home
SolidWorks Legion
RE: THRU, THRU ALL and Continuous Feature
As for CF, I'm noting the wording in Y14.5-2009, and it doesn't use the term "interrupted" at all. It only states that multiple features are treated as continuous. This is why I'm looking into how others are reading this.
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: THRU, THRU ALL and Continuous Feature
As far as I'm aware it doesn't say to assume THRU unless otherwise specified. If it did then why would it have the above statement? However if ModulusCT or someone can tell me where it says that I'm willing to learn.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: THRU, THRU ALL and Continuous Feature
I guess you might just throw that print in the trash.
This is a supposition on my part. Maybe due to a lack of understanding of the standard. But the standard says, "Where it is not clear that a hole goes through..." and the example (fig. 1-34) shows a hole with a diameter symbol and no depth information next to it (upper left). To me, this says that a hole CAN be assumed to be thru as long as it's depth is clear inferred in the view. Any question, perhaps due to other features on a part, and specifying THRU is the right thing to do.
RE: THRU, THRU ALL and Continuous Feature
My thoughts got truncated previously.
What I wanted to say was, when reading the spec, the language used there ("Where it is not clear that a hole goes through...") seems to indicate that there is definitely a situation where it could be clear that a hole goes through. If not, than I think it would have been worded differently.
RE: THRU, THRU ALL and Continuous Feature
Hey, I'm getting some interesting comments about CONTINUOUS FEATURE (or CF) on the Y14.5 Yahoo! group board. Anyone with thoughts about it here?
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: THRU, THRU ALL and Continuous Feature
RE: THRU, THRU ALL and Continuous Feature
No, it's mine!!! ;)
ht
Supposedly some of the ASME committee members or associates thereof are in this group.
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: THRU, THRU ALL and Continuous Feature
Even in cases where the holes could not be practically drilled in a single operation. If I had a set of studs for a building and indicated a hole "thru all" in the side of the studs, I would interpret that to mean a hole thru each stud through the whole length of the wall (or however many of the studs appear on the drawing indicating the hole).
However, my company doesn't reference any standards and I'm not familar with them. I can't say why that is how I interpret "thru" and "thru all".
-- MechEng2005
RE: THRU, THRU ALL and Continuous Feature
RE: THRU, THRU ALL and Continuous Feature
If it's a simple hole through solid material with no cavities etc then I'll use THRU. However, if there are walls/cavities I'll tend to add a section so it's unambiguous.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: THRU, THRU ALL and Continuous Feature
For what it's worth, I have always used the same interpretation as you described.
Joe
SW Office 2008 SP5.0
P4 3.0Ghz 3GB
ATI FireGL X1
RE: THRU, THRU ALL and Continuous Feature
Taken literally (as most info on a dwg usually is) THRU means totally through the part, not just until you hit air. Thus THRU ONE WALL and other variations are often used.
When in doubt, draw it out.
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: THRU, THRU ALL and Continuous Feature
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: THRU, THRU ALL and Continuous Feature
I notice most people refering to ASME Y14 so just to add another spin ... according to BS8888 there are two points I can glean.
1. One should assume that a hole is 'through' unless specifically shown otherwise. It is however acceptable to use additional 'notes' if the design intent would otherwise be ambiguous.
2. It is strongly advised that the use of abbreviations be kept to a minimum. If necessary they prefer that one should write the word in full to avoid ambiguity. The principal behind this is that a technical drawing should transcend language barriers.
Be interesting to hear you thoughts on my first post!!!
Cheers, Jon
RE: THRU, THRU ALL and Continuous Feature
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: THRU, THRU ALL and Continuous Feature
RE: THRU, THRU ALL and Continuous Feature
I would like to know why they didn't just go with CZ (common zone) like the ISO have been doing for years.
Are we really interested in standardization or not?
Frank
RE: THRU, THRU ALL and Continuous Feature
Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion
&
RE: THRU, THRU ALL and Continuous Feature
Tunalover
RE: THRU, THRU ALL and Continuous Feature
Tunalover
RE: THRU, THRU ALL and Continuous Feature
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: THRU, THRU ALL and Continuous Feature
Maybe your copy of the standard has a page missing tunalover. Heck, I already posted this above at 22 Oct 09 11:23 you guys aren't even trying.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: THRU, THRU ALL and Continuous Feature
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: THRU, THRU ALL and Continuous Feature
Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion
&
RE: THRU, THRU ALL and Continuous Feature
Good catch. Thanks for straightening me out.
Tunalover
RE: THRU, THRU ALL and Continuous Feature
Chris
SolidWorks 09 SP4.1
ctopher's home
SolidWorks Legion
RE: THRU, THRU ALL and Continuous Feature
I still haven't been able to find where in 14.5 it says that "A hole with no depth callout is a through-hole" even though I've often heard this said, and used it myself.
In fact 1.4b kind of implies this wouldn't be the case "...nor assumption of a distance or size is permitted...".
Maybe I'll actually increase my use of 'thru'
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?