Runout Symbol Question
Runout Symbol Question
(OP)
The attached drawing clip is from a rotor machine drawing and I have the following questions about the run out on this rotor:
1) Which symbol represents the run out on the vertical face? Which symbol represents run out on the rim? Is perpendicularity the same as runout on the face? My machinery handbook has a different symbol for run out and it is not seen on this picture.
2) What is the symbol with the circle-dot and F.I.R. beside it?
3) Is the face run out tolerance .0005 or .001 on this rotor based on this clip?
Please list references for responses so that I may look them up myself.
Thanks
http://files.engineering.com/getfile.aspx?folder=9...
1) Which symbol represents the run out on the vertical face? Which symbol represents run out on the rim? Is perpendicularity the same as runout on the face? My machinery handbook has a different symbol for run out and it is not seen on this picture.
2) What is the symbol with the circle-dot and F.I.R. beside it?
3) Is the face run out tolerance .0005 or .001 on this rotor based on this clip?
Please list references for responses so that I may look them up myself.
Thanks
http://files.engineering.com/getfile.aspx?folder=9...





RE: Runout Symbol Question
RE: Runout Symbol Question
My answers to your questions are:
1. A total runout symbol is the one with two arrows pointing to the top right. Circular runout only has one arrow.
2. The circle-dot symbol may be an old version of runout considering it is referencing FIR which stands for Full Indicator Reading. It looks more like concentricity though but there's no provision for straight FIR as it is currently defined.
3. As CheckerHater said, there is no reference to the modern version of runout so there's no real answer ot this question. You have a perpendicularity call out and what appears to be an arc length callout but that would make no sense so maybe it's a profile of a line callout that's just poorly drawn.
John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
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RE: Runout Symbol Question
Thanks for your help.
RE: Runout Symbol Question
Season
RE: Runout Symbol Question
What I mean is that if you substitute the total runout symbol for perpendicularity, it would have the same identical meaning. As mentioned already, this print doesn't use the runout symbol, but I'm just pointing out that in this case they have the same effect.
The circle-dot may be an old symbol for concentricity, but the fact that it says FIR means that it's not the same as concentricity as we know it today, because FIR implies that form is also being controlled.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Runout Symbol Question
RE: Runout Symbol Question
Also, as a side not, runout is a pretty broad term. In GD&T parlance there is "circular runout" or "total runout." In our case, perpendicularity is identical to total runout (a double-arrow symbol).
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems