Common Errors in GD&T Drawings: Mistakes in Defining Features
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- čas přidán 13. 07. 2024
- In this four-part series, dive into the world of GD&T with Jason as he explores the most common errors that we see in implementing GD&T on engineering prints, and learn practical solutions to avoiding these pitfalls.
*We'll be unveiling each part of our in-depth series weekly. Make sure to follow us to stay updated with each release!*
In part 2 of this series, we look at mistakes in defining features: incorrectly identified datum features, redundantly defined controls, over defined tolerances, and underdefined features. Uncover why these lead to issues and how to rectify these problems.
In case you missed part 1 of the series, discover how and why to reference the GD&T standard being used on your drawing in this video: • Common Errors in GD&T ...
Interested in learning more about Print Reading or GD&T? Check out more of our free GD&T resources here: download.gdandtbasics.com/you...
#gdandt #engineeringdrawing #datumfeature - Jak na to + styl
basic dimensions for thickness in side view don't have a size tolerance or form control
This is not a complete drawing anyway. The purpose was to show incorrect practices.
"what is missing?". I think I gave a fair answer
super!
Good video. Thanks!
You forgot to mention that the perpendicularity is correct if it is a datum
Using the hole positions as Datum B does bother me. It feels to me that this part will ride on a shaft, and it's most important to ensure the parts features are centered on the shaft. Therefore I'd prefer to see the ID 1.000 +/- .001 to be Datum B. Subsequently the bolt circle diameter and hole positions would be slaved to the bore. Trying to measure the position of the 1.500" boss based on the position of holes that themselves may have up to .0025" deviation seems ambiguous.
That's a great analysis of the decision making process that a designer must understand when selecting their datums for feature control frames. The functional intent of the part should dictate the select of datum features. With out seeing the rest of the assembly in this example we are only operating on assumptions of the final assembly criteria. If the center bore was a clearance bore then it would likely make more sense to use the pattern of holes as a secondary.
Your final drawing still has an error. The diameter symbol in the position of 0.188 should be just 0.01, not ⌀0.01.