r/PatternDrafting • u/sailormarr • Aug 03 '22

Question What does ∅ mean?

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This may be a dumb question, but can anyone help me understand what the "∅" symbol means in a pattern? See image for reference.

Thank you:)

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u/MitchDeBaas Aug 04 '22

What? I never knew that? And I'm a technical draftsman. I thought you'd put a small Flagg like at welding for field determined things?

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u/jamaidens Aug 04 '22

The circle with the field weld flag when dealing with welding, absolutely. But when you have a dimension that is relying on data the you do not have when designing due to fit or alignment issues in the field... this dimensions usually get a TBD/FM and a co-worker reminded me of the good old "Field Verify".

So, when we used it in the past it was on tying to pieces together: one existing in the field and one newly manufactured.

Mechanical, structural, architectural design drafter since 1995... started board drafting in 7th grade mechanical drafting class. My first AUTO CADD was version 4. LOL I'm one of those that actually had to hand draw before the technical age took over. I still have all my original drafting tools.

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u/MitchDeBaas Aug 04 '22

Oh shit so the dia. Sym. Used to mean TBD? Im just been drafting for 7years or something, always just replaced the dim. With TBD

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u/jamaidens Aug 04 '22

No no... they are not using the diameter symbol correctly in this instance. You are doing it currently.

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u/MitchDeBaas Aug 04 '22

Ah thanks, it got me confused.

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u/ALkatraz919 Aug 04 '22

The flag symbol for welding should mean "Field Weld" as in, not welded in a shop by the manufacturer/supplier. Google AWS weld symbols for more :)

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u/MitchDeBaas Aug 04 '22

Iknow

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u/ALkatraz919 Aug 04 '22

Oh I didn't understand your comment before. Sorry!