Machining Symbol

[reesecc66]

I've got a machining callout on a drawing that I haven't seen before. Wanted to see if I could get some help.

The callout is "60* T < on 3 1/4" Port Circle".

The * is for degrees.

I'm thinking that this just means total angle but haven't found anything to verify.

 

[Jboggs]

Seems like jargon related to a certain field. The only way to gat an answer you can rely on to make your customer happy is to go to him, your customer.

 

[CorBlimeyLimey]

Can you post an image to show the context of the callout?

 

[Sparweb]

I get the feeling that "Port Circle" comes from a spell-check auto-correct causing mischief. It sounds more like a "Bolt Circle" call-out. Also a plausible kind of error if the text went through an OCR (optical character recognition) process.

STF

 

[KENAT]

Or there are a bunch of 'ports' for air lines or similar.

Probably should be Pitch or something though.

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[reesecc66]

There is no actual detail in the drawing it is just the call out in the BOM section.

These are for a burner tip in a fired heater. Also, the port circle is correct as they are machined around the burner tip similar to a bolt circle.

The drawing we do have is from 1978.

 

[KENAT]

Were they too lazy to spell "TYP"?

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[Jboggs]

This is all good. Very good. Makes sense. But its still good guessing. The only one that knows for sure is your customer. You don't want to make something, get it wrong, and then tell your customer "some guys I don't know on the internet told me it might be this."

 

[Sparweb]

"...some guys I don't know on the internet told me it might be this..."
The money you paid for our advice is equal to the responsibility we take for our opinions!

Just kidding and you are right, that asking the customer is the BEST answer in many cases.
Don't make their ambiguous notation your problem.

STF

 

[KENAT]

Depending on the situation Jboggs may be spot on, but if there isn't a customer as such then it's not much help at all.

Sadly OP hasn't responded to clarify so we may never know.

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