On the first example: For profile I thought you could add a tolerance to the diameter if you wanted. In that case the profile would not control the size but it would still control the location, form, and orientation. Is this correct? Does the diameter need to be a basic if we use profile?
Profile tolerance requires a true profile to be equally disposed about. The true profile (the diameter in this case) is set by basic dimensions. Runout requires the separate size and runout tolerance.
We have a part drawing for a long cylindrical component that has a sharp point at the end (made by grinding 3 flat surfaces at an angle). We currently have called out on the drawing a runout of 0.1mm for the sharp tip. But a vendor we sent the drawing to is saying we should use "position" rather than runout. This component is spun in a drill for driving it into bone, and if the point is off center, it will not behave properly. Which do you recommend, runout or position?
The feature is circular, right? It sounds like the surface of this feature is important and not just the "axis of the mating envelope". Circular runout seems like the best option to keep that "surface centered"
Hey, great video. I have one doubt though. On the brake drum example, why not use profile by adding size and runout tolerance to profile. So that would be profile tolerance of 0.025 inches?
The function of the brake drum is to have a large size tolerance but tight runout. If it were converted to profile tolerance, the size would be basic. Then you must have a single value for size and coaxiality. You lose the large size tolerance that runout allows.
@@GeoTolProbut as you said, it is easier to maintain coaxiality on a lathe than size. So maybe that machine is able to achieve coaxiality of 0.003 and the remaining 0.002 can be used as an extra size tolerance adding to a total of 0.022 size tolerance
Not sure I understand your question. Total runout is a geometric tolerance. A datum is an axis or plane. I assume you are asking: can I tolerance a secondary datum feature with total runout? The answer is usually no. Runout must reference a datum axis. If your primary datum is a plane, then no. If your primary datum is an axis, then a perpendicular planar feature may be controlled with runout. However, I recommend a simple perpendicularity in that case.
@@GeoTolPro in the brake drum example when you add the total runout to the diameter of the brake drum which is 10 inches, is that the same as point the runout to the outer diameter? In my understanding is that when you put the fcf in the diameter, you are controlling the axis
I think your answer contradicts this video, which suggests that runout can be used as a datum: th-cam.com/video/NE7qDGybv5U/w-d-xo.htmlsi=E7x0SqQy3PLI3uWH Each person with different interpretation of the gd&t standard?
A runout tolerance may be used to control a primary set of common datum features (A-B). A runout is a tolerance not a feature. You are getting your terms mixed up.
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Still my best gd&t and gps go-to guy. Thanks 😁
Fantastic explanation! 👏👏👏
Thanks. That's very informative and helpful!
Great content
Well explained video
On the first example: For profile I thought you could add a tolerance to the diameter if you wanted. In that case the profile would not control the size but it would still control the location, form, and orientation. Is this correct? Does the diameter need to be a basic if we use profile?
Profile tolerance requires a true profile to be equally disposed about. The true profile (the diameter in this case) is set by basic dimensions. Runout requires the separate size and runout tolerance.
We have a part drawing for a long cylindrical component that has a sharp point at the end (made by grinding 3 flat surfaces at an angle). We currently have called out on the drawing a runout of 0.1mm for the sharp tip. But a vendor we sent the drawing to is saying we should use "position" rather than runout. This component is spun in a drill for driving it into bone, and if the point is off center, it will not behave properly. Which do you recommend, runout or position?
The feature is circular, right? It sounds like the surface of this feature is important and not just the "axis of the mating envelope". Circular runout seems like the best option to keep that "surface centered"
Hey, great video. I have one doubt though. On the brake drum example, why not use profile by adding size and runout tolerance to profile. So that would be profile tolerance of 0.025 inches?
What is the future of this gdnt and Siemens nx and package after 3YOE IN India?
@@anantakumar3581 wrong tag?
@@kaushikiyer9445 I am asking about package. What is wrong tag....
The function of the brake drum is to have a large size tolerance but tight runout. If it were converted to profile tolerance, the size would be basic. Then you must have a single value for size and coaxiality. You lose the large size tolerance that runout allows.
@@GeoTolProbut as you said, it is easier to maintain coaxiality on a lathe than size. So maybe that machine is able to achieve coaxiality of 0.003 and the remaining 0.002 can be used as an extra size tolerance adding to a total of 0.022 size tolerance
Can i use total runout as secondary datum?
Not sure I understand your question. Total runout is a geometric tolerance. A datum is an axis or plane.
I assume you are asking: can I tolerance a secondary datum feature with total runout?
The answer is usually no. Runout must reference a datum axis. If your primary datum is a plane, then no. If your primary datum is an axis, then a perpendicular planar feature may be controlled with runout. However, I recommend a simple perpendicularity in that case.
@@GeoTolPro in the brake drum example when you add the total runout to the diameter of the brake drum which is 10 inches, is that the same as point the runout to the outer diameter? In my understanding is that when you put the fcf in the diameter, you are controlling the axis
I think your answer contradicts this video, which suggests that runout can be used as a datum: th-cam.com/video/NE7qDGybv5U/w-d-xo.htmlsi=E7x0SqQy3PLI3uWH
Each person with different interpretation of the gd&t standard?
A runout tolerance may be used to control a primary set of common datum features (A-B).
A runout is a tolerance not a feature. You are getting your terms mixed up.