The best tools in learning "GD&T" is to always find great quality curriculum materials. This is great! Scott Neumann has the teaching skills to explain the right-stuff on Runout Tolerancing Controls. T J (Tom) Vanderloop, Award Teacher of the Year in Wisconsin, 1996
a very important side note ist that the tolerances are not correctly indicated. Total run-out has to be pointed at a surface not an axis. a position geo tol can be pointed at an axis OR an surface. if you point a position tol at the surface [position|0.1|A] it has (nearly) the same meaning as [tot run o.|0.1|A]. so pointing at the diameter directly as shown in the video always means the axis and NOT the surface -> this means the Total run-out tolerance in the video is not correctly indicated.
I don't know of an official rule in Y14.5 that forces runout to be pointed to the surface (although a lot of the examples show it like that). In Y14.5-2009: Fig 3-29 (feature control frame placement), there are two runout tolerances that are placed under the size tolerance. Position RFS always controls the axis of a cylindrical feature within a cylindrical shaped tolerance zone. You may have it mixed up with MMC or LMC modifiers? A position MMC or LMC controls the surface, but that's not what the video talks about.
@@GeoTolPro thanks for your reply. I dont know about Y14.5 but the ISO clearly differentiates between surfaces and axis/midplanes by where you point with your arrow. So you can know in every case what is meant.
ISO has different notations. Position always is pointed to the feature. But you use two the opposing dimension lines across the feature of size to get the median line/median surface (derived feature). Position can't control the surface of a round feature (hole/shaft) but position can be applied to planar surfaces with a leader. Yes, runout is directed to the surface. (ISO 1101:2017) Also note position controls straightness in ISO standards. The derived median line must lie within the tolerance zone. (instead of the axis of the unrelated AME in Y14.5)
It depends on the application. Runout adds an extra form control with the coaxiality. Do you need the extra form control or did size tolerance do a good enough job controlling form? Runout can be overkill on a lot of applications.
@@GeoTolPro for a shaft with less number of step features, I applied positional tolerance. For sealing application, do you suggest applying runout to control form?
Best GDT videos. Very well explained.
The best tools in learning "GD&T" is to always find great quality curriculum materials. This is great! Scott Neumann has the teaching skills to explain the right-stuff on Runout Tolerancing Controls.
T J (Tom) Vanderloop, Award Teacher of the Year in Wisconsin, 1996
4:51 was 🔥 great explanation
This is exactly what I need, thanks!!
Very clear explanation of the total runout concept. thank you.
Your video is very good. Thanks for this comparison.
Well explained Sir,
Thanks a lot for your training material, well explained.
very good lecture 👏👏👏
a very important side note ist that the tolerances are not correctly indicated. Total run-out has to be pointed at a surface not an axis. a position geo tol can be pointed at an axis OR an surface. if you point a position tol at the surface [position|0.1|A] it has (nearly) the same meaning as [tot run o.|0.1|A]. so pointing at the diameter directly as shown in the video always means the axis and NOT the surface -> this means the Total run-out tolerance in the video is not correctly indicated.
I don't know of an official rule in Y14.5 that forces runout to be pointed to the surface (although a lot of the examples show it like that). In Y14.5-2009: Fig 3-29 (feature control frame placement), there are two runout tolerances that are placed under the size tolerance.
Position RFS always controls the axis of a cylindrical feature within a cylindrical shaped tolerance zone. You may have it mixed up with MMC or LMC modifiers? A position MMC or LMC controls the surface, but that's not what the video talks about.
@@GeoTolPro thanks for your reply. I dont know about Y14.5 but the ISO clearly differentiates between surfaces and axis/midplanes by where you point with your arrow. So you can know in every case what is meant.
ISO has different notations. Position always is pointed to the feature. But you use two the opposing dimension lines across the feature of size to get the median line/median surface (derived feature). Position can't control the surface of a round feature (hole/shaft) but position can be applied to planar surfaces with a leader. Yes, runout is directed to the surface. (ISO 1101:2017)
Also note position controls straightness in ISO standards. The derived median line must lie within the tolerance zone. (instead of the axis of the unrelated AME in Y14.5)
Thank you for the best explanation. For rotating shafts, is it recommended to use total runout compared to position tolerance?
It depends on the application. Runout adds an extra form control with the coaxiality. Do you need the extra form control or did size tolerance do a good enough job controlling form? Runout can be overkill on a lot of applications.
@@GeoTolPro for a shaft with less number of step features, I applied positional tolerance. For sealing application, do you suggest applying runout to control form?