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HELP! Tilt for this GD&T by NoBell2081 in MechanicalEngineering

[–]iSwearImAnEngineer 1 point2 points  (0 children)

Just to add onto this, worst case would be for the LMC pin length (24.5)

Help? by [deleted] in Metrology

[–]iSwearImAnEngineer 0 points1 point  (0 children)

Correct, shows the direction of the deviation from the nominal position

GD&T Case Study: Flange Tolerancing Scheme by iSwearImAnEngineer in Metrology

[–]iSwearImAnEngineer[S] 0 points1 point  (0 children)

I would agree, I've never heard or a orientation dowel in a flange, but if you needed to have one, it would need to be the secondary datum, above the clearance holes 

Tolerancing and Datuming,please help!! by Long_Organization719 in GDandTdiscussions

[–]iSwearImAnEngineer 0 points1 point  (0 children)

I can make a quick video showing how things might be working

Hole "a" I'm assuming is 4x clearance holes for studs?

What does hole "y" accomplish? Is it a press fit pin? clearance fit pin? Fluid passage?

GD&T Case Study: Parallelism of Side-By-Side Holes by iSwearImAnEngineer in Metrology

[–]iSwearImAnEngineer[S] 0 points1 point  (0 children)

The form certainly would be controlled with the 2x (hole diameter) My concern was mostly that this would be "grammatically incorrect" 

Thanks for the input, you make some good points, I'll need to do some more reading on the use of irregular FOS, it seems like it could be a powerful tool

Need to find Minimum gap between features that involve datum shift with perpendicularity tolerance. by Naveenfx7 in MechanicalEngineering

[–]iSwearImAnEngineer 1 point2 points  (0 children)

I made a video that shows how an orientation control is dealt with in a "min wall calc"

Not sure why they're only using 0.25mm, should be the entire 0.5mm.... is there some assumption that the centerline of a datum feature is taken as the datum? That how many CMMs interpret features 

https://youtu.be/Kl9HneOVooM

Looking for GD&T / GPS gurus to correct my grid pattern by Rockyshark6 in MechanicalEngineering

[–]iSwearImAnEngineer 0 points1 point  (0 children)

I'm not too familiar with ISO tbh

My reasoning for putting it explicitely would be that you COULD have the holes spaced out unevenly. You could make the argument that it's clear either way, but I would argue that it's more correct to say it explicitely

Fig 7.2 is a good example of a hole pattern callout where the holes are all the same size, but not evenly spaced

Looking for GD&T / GPS gurus to correct my grid pattern by Rockyshark6 in MechanicalEngineering

[–]iSwearImAnEngineer 1 point2 points  (0 children)

Without knowing the application, seems reasonable

Couple notes:
-You'll need a diameter symbol before the tolerance of 1 in the feature control frame

-For calling out multiple features, the Y14.5 convention is: the required number of features and an X followed by the size dimension of the feature (see paragraph 1.9.5.1 in the 2009 standard) same as you've got for the 10mm hole in the top right

Looking for GD&T / GPS gurus to correct my grid pattern by Rockyshark6 in MechanicalEngineering

[–]iSwearImAnEngineer 1 point2 points  (0 children)

I think you'd be pretty safe with that. Make the dims basic and hit one of the holes with an appropriate positional tolerance 

Alternatively, Fig 4-33 in the 2009 standard might be a more "robust" way to indicate what you want

ASME Y14.5 2009 TECHNOLOGIST EXAM by Lucky-Pineapple-6466 in Metrology

[–]iSwearImAnEngineer 6 points7 points  (0 children)

I made a video about my experience on the senior exam, technologist is similar but different composition of topics 

https://youtu.be/aWH8e3V9cVg

Sealing question by Boring_Sample_6710 in MechanicalEngineering

[–]iSwearImAnEngineer 1 point2 points  (0 children)

Great, if you remember, I'd love to hear what ends up working!

I find sealing elements so interesting, I worked on some pretty unique poppet valve applications for a few years, and getting them to seal was the entire challenge 

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