countersink callout 1

[KimBellingrath]

I have a customer drawing with a counterisnk callout that uses 'VD' after the dimension. What does 'VD' mean?
Thanks

 

[TheTick]

Is it an actual letter "V", or the V-shaped symbol sometimes used for countersinks?

Does the value of the dimensin correspond more closely to a diameter or to a depth?

 

[KimBellingrath]

The callout is as follows:

"90º C'SINK TO *.28-VD" (* = diameter symbol)

Quite clearly a letter 'V' and not the angle symbol. So they give the angle AND the diameter and then add "-VD"
weird, huh?

I'm stumped - the old books say that 'VD' = Van Dyke!

 

[ewh]

Is this hole going into a flat surface? If not, could it mean "variable depth"?

 

[KimBellingrath]

Good guess...but there are many chamfers and countersinks on this part both on flat and non-flat surfaces. And they all have '-VD' after the diameter.

 

[ctopher]

I think it means the "V" diameter (The diameter at the top of the angle). Which is not correct. A 90º C'SINK can not be controlled by the .28 tol.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716

 

[KimBellingrath]

That's confusing. ANY diameter countersink can be controlled by the diameter dimension - that's the way it is done. I have no questions about that aspect. I just want to know what VD stands for. How do YOU measure a countersink, Chris?

 

[ctopher]

You can dim c'sink by depth/angle, angle/dia or depth/dia (not preferred).

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716

 

[smcadman]

It may be that your customer did not know how to input the countersink symbol, so he used a V instead, and the D could be for diameter.

Previous Standards
[Ø].25 THRU
C'SINK 82
TO .50 DIA

ASME Y 14.5-1994 Standards
[Ø].25
[∨][Ø] .50 X 82[°]

Flores

 

[EngJW]

If your customer can't explain it, you might just as well disregard the VD and take it as a standard countersink. If they find fault with it, the burden is on them to show otherwise.

 

[KimBellingrath]

The buyer just responded:
She says that guy went out in the shop and asked. She was told that it stood for "Visuallu dull" as in break edges.
Think someone's pulling her leg? I do.

 

[ctopher]

What language is that?
Never heard of it.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716

 

[MadMango]

I think KimBellingrath made a typo? Maybe that was suppose to read "visually dull"?

[green]"I think there is a world market for maybe five computers."[/green]
Thomas Watson, chairman of IBM, 1943.
Have you read faq731-376 to make the best use of Eng-Tips Forums?

 

[KimBellingrath]

Exactly - Sorry for the confusion. I should have checked my speling.

 

[ctopher]

For a c'sink callout, "visually dull" does not make sense to me. Some inspectors may argue the description of it.
I would remove it and just call out the depth/angle. If the surface roughness needs to be something special, it needs to be indicated.

Chris
Systems Analyst, I.S.
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716

 

[Tunalover]

KimBellingrath:
You'll find lots of seeming experts on D&T in this forum. Years ago I learned that there are reams of people who are convinced that "their way" is the "right" way or the only way to do it. When in doubt I simply go to ASME Y14.5M-1994 and all the other ASME standards. I am not shy about leaving behind all those self-proclaimed experts in favor of going to the "horse's mouth" of ASME standards. As for abbreviations such as VD I would first go to ASME Y14.38 ABBREVIATIONS. If you don't have Y14.38 then MIL-STD-12 is practically identical and available for free on the Defense Logistics Agency's free ASSIST on-line document server.



Tunalover

 

[ewh]

tunalover,
Ease up a little. I haven't seen any posters claiming to be experts on this forum. I am often given new insight to Y14.5 through this forum. I agree that ideally the standards should be followed, but this isn't an ideal world. KimBellingrath had a question that is not addressed in ASME Y14.5.
If this abbreviation was covered by these standards, this would have been a very short thread, but it isn't, so we are just putting out suggestions on what the abbreviation may mean. Just because the abbreviation isn't listed in the standards doesn't mean it should be ignored without trying to determine it's purpose and meaning.