If you get a chance, take a look at B.3.5:
"Other methods may be used to determine the inside diameters of larger O-rings after the cross-sectional and parting line projection dimensions have been verified and found to be within tolerance limits, such as a flat gauge with a predetermined...
CH - I agree with your same sentiments. Just having a look for say a simple o-ring, we can refer to ISO 3601-1 Annex B.
Measurement of cross-section dimension:
micrometer (ball type anvils)
vernier calipers
optical comparitor
rotating-type fixture with dial indicator
visual or laser...
Does anyone have any recommended resources (specialty standards, guide books, etc) that explains the best practices for dimensioning and tolerancing flexible parts such as seals and gaskets? We use ASME Y14.5-2009 as our standard for rigid and nonrigid parts (subject to free state variation -...
One of the challenges here is measuring every feature in the free state. I have already suggested to use a restraint condition when first consulted, but that idea was dismissed early on. The challenge here is if we can define these features in the free state or not.
Kind of along the lines I...
I wanted to get a few opinions on how to control the features on a specific type of part.
Imagine a complex surface of revolution, much like a bowling pin or a coke bottle. The features along the part are circular in nature, but not all features are cylindrical. Now imagine the same bowling...
eeyew,
Please also note that use of CF symbol is only allowed per the ASME Y14.5-2009 standard where it was introduced. If using the 1994 (or prior) standard, other methods will need to be used to define the two surfaces as a single feature.
Dimensioning and tolerancing for manufacturing rather than for function is risky. If a drawing is created for Supplier A with their own setup and process, what happens when the design is sourced from Supplier B with a different manufacturing setup or process?
Drawings (specifications) should...
For reference, DOD-STD-100G was cancelled and superseded by the following ASME standards:
ASME Y14.100 - Engineering Drawing Practices
ASME Y14.24 - Types and Applications of Engineering Drawings
ASME Y14.35M - Revision of Engineering Drawings and Associated Documents
ASME Y14.34M - Associated...
I always prefer to reference the spec number as well as the revision number. If needed, it can be updated later to another revision via your change management system. Best to be explicit so there is only one possible interpretation of the requirements, reference specifications, and associated...
Paragraph 7.4.8 in the Y14.5-2009 standard does provide some explanation for using Position on an individual basis, but provides no clear direction on the use of 6X Detail A in my opinion.
Enginerd9,
Thanks for sharing those details about your prior experience. Really helpful. Would you have any reservations about sharing some information about size tolerance, Position, and Cylindricity requirements you had for your application?
In our application, we do use what we call "spacer...
3DDave,
Thanks for your input - I never have use circumference in this manner before - but it is an interesting idea.
Also, I never meant to sounds rude at all. I apologize if it came across that way. I know many of the other contributors are trying to help, but in this case I was looking to...
Thanks for everyone's input thus far.
However what I really wanted to stay focused on is the topic of independence of size and form when needed to override Rule #1.
Let's try to stay on track and focus on this topic.
Sorry for the late timing, but had some time at work to put together this simple sketch. Please refer to the attachment.http://files.engineering.com/getfile.aspx?folder=4701559b-7086-4b9e-b15a-03be7853d215&file=Bearing_Housing.jpg
Mike,
Thanks for your reply. I think I can add some answers to a couple of questions you posed here.
Yes, we do monitor press force during assembly.
Press force during reassembly is very similar (single digit percentage difference) to that measured during initial assembly.
The assembly is...
I have a question about a thin walled aluminum bearing housing (semi rigid?) in regards to feature size and form.
My application requires a tight tolerance for the bearing housing bore in which a deep groove radial ball bearing will be installed via a press fit. These bearings are custom made...
I believe the intent of this paragraph in the standard is to suggest that ECNs should normally not be issued specifically for the intent to correct misspelled words and the like. Rather, these changes should wait and be included on an ECN that has higher ROI in which such changes can be...
