At my company we have the part drawing and sometimes there is an accompanying drawing that we call the "process print". The process print can have different dimensions/notes than the part print. The process print dimensions/notes are based around measurements that can be taken quickly...
We use FDMP with MMC bonus tolerance all the time on "flat" shaped parts stamped from coil stock. It allows for a "pass-through" gage to be employed to check the flatness of the part. It fits our design intent and works great for us.
My rash usually stems from the note "no burrs allowed".
(2009) 4.11.6.3 - Clarifying Applicable MMB - In cases where the boundary is not clear, or another boundary is desired, the value of the boundary shall be stated, enclosed in brackets, following the applicable datum feature reference and any modifier in the feature control frame.
2018 covers...
My experience in implementing ASME Y14.5-2009 at my company.
1) I second what The Tick states about passive resistance. Get ready.
2) Watch out for people who claim they already understand the standard because we "used GD&T at my old job". If they are not certified or have not read the...
Rule #1 (ASME) requires perfect form at MMC for Regular Features of Size. It does not required perfect orientation or perfect location. A RFOS can have perfect form and still be less than perfect for its orientation and/or location.
Along with using the new moveable datum target symbol, figure 4-47 from 2009 added a 2X basic 45° and a basic 9 dimension when compared to figure 4-38 from the 1994 standard. Otherwise, these two figures are identical.
I have seen at least one GD&T author show their interpretation of a fixture...
I have a compression screw that has a conical tip that terminates in a spherical radius. In assembly the tip of this screw sits in a very shallow dimple. The assemble must pass many tests but the two I am here to discuss are a 30-day salt fog exposure (20% by weight sodium chloride) and a...
For what it is worth, a reputable company once published the attached as an approach to defining a similar part (per ASME Y14.5-1994).
https://files.engineering.com/getfile.aspx?folder=3f4a21f9-51f5-445c-a7c9-a6f06977d8d4&file=similar_part_per_ASME_Y145-1994.pdf
EDIT - Sorry, just noticed that you are using ISO and not ASME. I am not very familiar with ISO but maybe some of the below still applies.
for standard compliance:
The perpendicularity FCF is missing a dia. symbol in front of the zero tolerance value.
for clarity:
Add the all around symbol to...
If you use Profile to describe the non-parallel surfaces you open the door to using MMB modifier on that datum in subsequent FCFs. I'm not sure is this is answering the OP's second question or not.
How can you verify if the position of the sphere is correct if you don't know where its true position is? You will need a basic dimension from the datum point that is generated from the datum feature A cone. If you stick with positioning the sphere feature you will need to add an "S" in front...
If you employ the same datums, in the same order, with the same boundary conditions for all of your profile FCFs the rule of simultaneous requirements will allow you to avoid the use of a clocking datum feature (section 4.19 ASME Y14.5-2009).
If you are following ASME Y14.5 for this part there...
The below is written with respect to the ASME standard (ASME Y14.5).
If you are just starting to study GD&T then I recommend you make it a priority to understand the terms and their definitions, as written in the standard. Learn the difference between LMB and LMC, and the difference between...
ASME Y14.5-2009 Section 1.4 Fundamental Rules
Fundamental Rule (g) : Dimensions should be arranged to provide required information for optimum readability. Dimensions should be shown in true profile views and refer to visible outlines.
ASME Y14.5-2009 4.11.6.3 - Clarifying Applicable MMB
In cases where the boundary is not clear, or another boundary is desired, the value of the boundary SHALL be stated, enclosed in brackets, following the applicable datum feature reference and any modifier in the feature control frame.
I think...
Thanks for the input everyone.
I agree that the CR and proposed CSR have their own issues. I am putting together a list of options for defining a critical feature. CSR is going to be one of them ...... followed immediately by "do no recommend", lol.
feature: hemispherical concave feature...
Does anyone have a reason why a controlled spherical radius could not be invoked as an extension of principles (extension of the principle of a controlled radius)?
Thank you.
ISO 13715-2019 Edges of Undefined Shape - Indication and Dimensioning
What does "t=3" signify in figures 21 & 22? If there is language in the 13715 standard pertaining to it, then I am entirely missing it. Is this a symbol that is described in a different ISO standard?
Thank you very much...
