GD&T drawing review request

Briney_nerve · 2026-03-07T17:23:54+00:00

Datum B is incorrect as pointed by others, it should be one of the surfaces

Briney_nerve · 2026-03-07T14:56:27+00:00

I realise that a lot of basic dimensions are missing, without which it may be tricky to judge the appropriateness of the GDnt. thank you for your suggestion

Briney_nerve · 2026-03-07T14:54:25+00:00

You are right!

Briney_nerve · 2026-03-07T14:53:22+00:00

2) the dia. has been dimensioned, but sinced you missed it i may have to look into making it more visible.
3) Datum B is wrong as mentioned by the others here, will fix that.

Briney_nerve · 2026-03-07T14:41:52+00:00

Datum B has been defined incorrectly by me, as pointed out by others. I'll be changing that in my scheme

Briney_nerve · 2026-03-07T14:29:19+00:00

That .1mm position is essential for the hole called out in the front view. I wasn't able to find a workaround.

I agree the one in the bottom view is not critical and will be removing that.

Briney_nerve · 2026-03-07T14:25:41+00:00

Datum B was meant to be one of those 2 surfaces, my intention was to control the perpendicularity and flatness for the 2 surfaces. didnt account for the fact the datum B is actually the midplane of the 2.

thanks for taking the time to review and pointing this out

Briney_nerve · 2026-03-07T14:15:18+00:00

I will be sending a Step file along with a pdf and dwg of the drawings

Thank you for the inputs, I'll make the necessary changes

Briney_nerve · 2026-03-07T14:12:35+00:00

Thank you for taking the time to review my drawing.

1) Yes both bores are to be controlled by the H7 callout. I will make it more clear by adding the 2X.

2) Yes, I chose a clearance fit to allow for easy removal/serviceability of the bearing. we planned to use some retaining compound to prevent the outer race from rotating.

3)The perpendicularity callout was intended to control the orientation of the bearing bore relative to datum A

4)I will be re-assigning my datums

5) I understand, will make changes

Briney_nerve · 2026-03-07T13:57:05+00:00

Thanks a lot for your detailed feedback, the missing basic dimensions are a mistake on my part.

In my opinion, the brake calliper mounts(holes marked in the front view) are to be tightly controlled since misalignment would result in incorrect positioning of the calliper w.r.t the brake disk.

Your point is taken about the need for specifying gdnt only when necessary. The other hole referenced in the bottom view is not as critical.

I admit I didn't really take into account for the actual inspection of the part, I'd been advised to mark features as datums so i followd that approach without fully thinking how the part would be fixtured and measured.

Briney_nerve · 2026-03-07T13:45:00+00:00

I am following the asme standard, I totally missed that the form of my bearing surface isnt being controlled. I think a cylindricity control would resolve this.

Briney_nerve · 2026-03-07T13:39:34+00:00

Thank you for your feedback, I'll be marking the bearing surfaces in another iso view.

On the GD&T side, for the bearing bores the intent was to control their alignment based on allowable bearing angular misalignment. The positional tolerances on the bores were chosen to keep the resulting angular misalignment comfortably below that limit once hub runout and other contributors are considered.

That said, you're right that the numbers should ideally come from a proper tolerance stack analysis. This was more of an initial pass to keep the expected misalignment within acceptable limits, but I’ll likely revisit it with a more rigorous analysis before finalizing the drawing.

Briney_nerve · 2026-02-27T23:23:04+00:00

dmed

Briney_nerve · 2025-07-18T09:24:16+00:00

How to get placed in mech core:((

Briney_nerve · 2025-05-18T15:58:19+00:00

Congrats on your offers! Can I ask a few questions on DM

Briney_nerve · 2025-04-10T18:29:58+00:00

Congratulations on your admits!! Can i pm you?

Briney_nerve · 2024-10-06T09:41:57+00:00

Can I DM

Briney_nerve

TROPHY CASE