thru versus thru-all -the final thread?

Hi all,

I know this has been brought approx. 1000 times before but I would love to clarify what is the correct note (asme or ansi) for a hole going into a tube.

Logic says that THRU would indicate throught the first face of the tube. Whereas THRU ALL would be thru both sides of the tube, either rectangular or round.

I think that notes such as 'this face only' and so on are helpful to avoid confusion but I'm curious what the spec says about it (if anything).

Thanks,

Zander

Reply to
Zander
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Right this minute I can't seem to find my copy of ASME/ANSI Y14.5, but if I remember correctly it doesn't offer a recommendation to put THRU after a hole callout. It CERTAINLY doesn't EVER mention the use of THRU ALL. I spent years as a drawing checker and manufacturing liaison person for some very well-known high-tech firms, and was regarded as the company GD&T expert in those firms, and I'd strongly agree with you that notes such as THIS FACE or FAR SIDE or THRU ALL are helpful, and that THRU should really mean through only the face on which the callout exists.

Regardless, if you'll note, when you define a hole using the Hole Wizard as being Up To Next, you'll get an automatic hole callout of THRU instead of THRU ALL (as you would when you define the hole as being Through All).

'Sporky'

----------------------------------- Zander wrote:

Reply to
Sporkman

Thanks Sporky,

What happens to my drawings sometimes is that I will check it - see a not like thru or a blind hole depth and immeidiately know and understand it. Then - unbeknowenst to me, my drawings will end up at an unknow fabricator with probably untrained personel (at blueprint reading anyways) who will make several mistakes in a row such as - 1: be unsure about a hole note and not ask anyone about it. 2: misunderstand a hole note or other annotation or dimension etc. 3: act on the preceeding 2 error resulting in scraped material. which leads to 4: my customer calling and asking why the drawing doesn't explain everything in 'plain english'. !!!!!!!

Zander

Reply to
Zander

Zander & Spork, As specified in ASME Y14.5M - 1994

- Section 1.8 Dimensioning Features

-- Sub-Section 1.8.1 Diameters Where the diameters of a number of concentric cylindrical features are specified, such diameters should be dimensioned in a longitudinal view if practicable. My Interpretation: If multiple diameters are involved, it is always clearer to dimension diameters & depths in a section (side) view as opposed to the plan view. In this way, there can only be one interpretation per the print.

-- Sub-Section 1.8.9 Round Holes Where it is not clear that a hole goes through, the abbreviation THRU follows a dimension. My Interpretation: The "THRU" abbreviation should be used for clarification as needed. I have also worked in the capacity of a Checker and have been responsible for company standards and meeting the requirements of various specifications. Whenever in doubt, I have always used the terms "THRU", "THRU ALL", "THRU ONE WALL", "THRU BOTH WALLS", etc. Whatever it take so that there can only be on interpretation and that the drawing stands alone. The last two requirements are also per ASME. Regards, Eddie

Reply to
Eddie

Until next year when ASME Y14.5 - 2006 comes out... ;)

Reply to
IYM

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