@drawoh thanks for the clarification--in the case of using CMM could I put a datum target on like the last inch of the cylinder ID since I'm most concerned about it being concentric specifically at the tube ends rather than concentric along the entirety of the tube and then call the positional...
@drawoh thanks so much for the note on sect. 4.20 this is exactly what I was looking for!
In terms of drawing practice, if I were to stick with positional tolerance in this case would it then make sense to have the pos. tol. directly back to A only, so that datum feature C has no effect and...
@drawoh I like that explanation
Attached is what I have for the mating end sections (this is the female groove side). The part itself is a long (think feet) honed out tube section and I need the ends to mate up concentrically with each other. Datum A is the primary and datum B is the male...
Thanks for the quick reply @greenimi--this is an ASME drawing. Currently using Y14.5-2009 as I haven't yet sat through to review the changes that were made in the 2018 version.
Hello all,
Quick question: I've been reading the forums here for a few hours and I'm pretty sure I have my answer already but I'd like to confirm with the community to make sure I'm thinking about this in the correct manner.
On a tubular part, I have two cylindrical features that I'm trying to...
Thanks for the feedback everyone, and thanks @3DDave for the thorough guidance.
A few more questions:
I was previously under the impression the OD of the part had to be the feature which datum B lies off of, due to the lathe grabbing this surface of the part during machining.
My intent was...
Also thanks for bringing up the caliper note, I don't know why this hadn't occurred to me before. As far as the feature that is inaccessible with calipers/micrometer, I think I can make the entire A surface to be one plane (trim the outside to match) and just add a separate spacer to account for...
Hello all, thank you for the constructive responses. I've attached a simplified version of the assembly with the mating parts shown. The 4.137" feature controls the location of the tube ID on the left, as the goal is to align the ID of the tube/cylinder as much as possible. The perpendicularity...
@3DDave, could you please suggest how I might go about making this into a functional drawing then? My intent above all is to make something that complies with good dimensioning and GD&T practice, and I am open to constructive feedback on how to improve this.
Hello,
It's been a few months since I've made a detailed drawing and I can't tell if I'm forgetting my fundamentals at the moment.
Do the dimensions and GD&T in this view follow good drawing practices? Primarily, I can't remember if assigning datum A and datum C to recessed areas (and...
