What is this symbol ?

[paul1956Participant @paul1956]

I’ve just come across this symbol on an engineering drawing, a circle with three bars inside, can someone please explain what the three bars signify.

 

[HOWARDTParticipant @howardt]

As a life long draughtsman, now retired and from the UK it is not one I have come across, I assume it is someone’s indication of a datum point, a point from which features are measured from.  It is quite usual to use a datum point, sometimes positioned at the intersection point of two lines. For me the indication used to be two short lines at 90deg with a bold dot at the intersection or a circle.

[JasonBModerator @jasonb]

Not one I have seen. What part of the world do the drawings originate from as that may be a clue to the system being used.

Can you post any other views of the part and say what it is, that may give a clue

[DiogenesParticipant @diogenes]

Yes need some more context / clues – intuitively it could perhaps be a demand for circularity (i.e. ‘ream’)..

[Michael GilliganParticipant @michaelgilligan61133]

I cropped your image to remove extraneous detail, and then asked Google Lens

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MichaelG.

[OldironParticipant @oldiron]

Michael G strikes again. Good find Michael.

[paul1956Participant @paul1956]

Not sure the AI is correct here. I tried the same and got similar results about welds, but that seems wrong given the dimensions and object (a model steam chest). My impression is that the 3/16th dimensions define the circular feature’s position, not it’s diameter.

The drawing is part of a set by Keith Bucklitch of Charles a 16mm scale steam loco on the steammodelloco.io group, (I assume UK based ?) and no particular drawing standard specified on the drawing.

Another part of the drawing has a similar circle, but with more segments and is defined with a thread size, but there’s nothing specified on the steam chest drawing.

 

[Michael GilliganParticipant @michaelgilligan61133]

Please don’t shoot the messenger 🙂

I only reported what I found.

MichaelG.

[paul1956]

On paul1956 Said:

 

The drawing is part of a set by Keith Bucklitch of Charles a 16mm scale steam loco on the steammodelloco.io group, (I assume UK based ?) and no particular drawing standard specified on the drawing.

this looks like the good place to ask

[paul1956Participant @paul1956]

this looks like the good place to ask

Indeed, but I’d wondered if this was some general convention for drawings I’m not aware of.
Maybe not and just a peculiarity of this drawing.

[Author]

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