Unknown Drawing Symbol
Unknown Drawing Symbol
(OP)
Hello All,
Please refer to attached PDF for circled symbol in question. I have tried googling a description of this symbol but have had no luck. Does anyone know what the symbol means and what the value next to it represents?
Thank you,
Aure
Please refer to attached PDF for circled symbol in question. I have tried googling a description of this symbol but have had no luck. Does anyone know what the symbol means and what the value next to it represents?
Thank you,
Aure





RE: Unknown Drawing Symbol
Chris, CSWA
SolidWorks 14
SolidWorks Legion
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
The “italic f” is a surface finish mark, the cross mark, hash mark is on/intersects the line (surface) to which it applies. The “italic f” preceded the newer 60̊ V as the std. finish mark. I’m not sure what the 3.0 means, you have to study the drawing and the full indication with the V to the left. Take a look at some older Mechanical Drawing textbooks.
RE: Unknown Drawing Symbol
Thank you, this gives me a bit more to go off of. I will try to locate an older machinist handbook and check there for more info.
Thank again,
Aure
RE: Unknown Drawing Symbol
An italic f (Latin small letter f) written on a line representing a surface was an old way of indicating that the surface was to be machined rather than left in the as-cast or as-forged state. The "f" came from "finish" in the sense of "machine finish" as opposed to raw stock/casting/forging. Later the ASA convened upon a letter V (specifically a sans-serif V) touching the surface. Soon this evolved into the "check mark" sign with accompanying number that tells the reader a max roughness value (RMS, microinches or micrometres) for the machined finish, to be measured with a profilometer.
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Unknown Drawing Symbol
If what others state is correct, this would seem to indicate the initial machined surface must have a profile tolerance within 0.35mm of datums A,B,C, a max surface roughness of 3.2 micrometer, and a max stock removal of 3.0mm. Normally, this machined surface would serve as the basis of all subsequently machined features. But since there is no dependent datum attached to the profile tolerance, this would not seem to be the case.
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
RE: Unknown Drawing Symbol
As Jboggs noted, there is no standard meaning for this symbol. Since the image you provided appears to use a current system of GD&T for all of the other dimensions, you should refer to a standard like ASME Y14.5-2009.