Hi,
IF I OVER SIMPLIFY There are two approches to dimensioning : one for feature of size and the other on for the rest. Feature of size are feature with two opposed surfaces. hole depth, in that sence are not feature of size. direct tolerancing on the dimension is used on FOS dimensions...
Hello all,
As some of you might know, I am teaching GD&T at the college level. I was wondering if there was a rule of thumb about the value to give for datum tolerances. I got a tip about that a few years ago from someone in the aerospace industry. The rule of thumb was to make the datum 10...
Hello All,
Following thread1103-507627 that has been closed since, I had additional questions on the evaluation of the run out when two datum with two diameters are called in the drawing. I understand the limitation of using V-blocks to setup the inspection. This being said, when calculating...
I am a still new college teacher.
Last semester, I tried to convey what is a proper assembly drawing to my GD&T class student, effectively trying to make them forget the nice looking yet not always practical exploded view they saw in the much more interesting previous CAD classes.
yet, I...
Hi,
I love when students challenge me. I was teaching student about threading, and how Class 3 has a tighter tolerance than class 2 and even more than class 1.
I told them that class 2 is generally what is used but aerospace and other industries need tighter toleances, hence class 3.
A...
Hello,
Is there a standard on how to show simplified representation of gears and chains? I see no added value to represent each tooth or each link of a chain. I can't seem to find the information on the books I have on hand.
Thanks
Hello all,
I've tried seaching the standard and the threads but can't find a clear answer.
A student gave me a drawing of a sheet metal part that is bended to look like a "U". Two coaxial holes are made on each side of the "U". The student decided to make the holes Continuous Features in...
Hello All,
I am pulling my hair right now trying to find documentation on a concept for which I do not know the English term. As you can guess, English is not my first, nor my second language. In French, the term is "transfert de cotes géométrique" which litterally translate to geometrical...
refering to the thread1103-321896
I just finished reading the asme y14.5 cover to cover and I just started reading the study guide I ordered from ASME.org when I realized there another book to buy.
Do I REALLY need to buy both the study guide and Y14.5.2 - 2000??? I don't mean to be cheap but...
Hello,
Being nearly bald, I can't afford pulling anymore hair.[hairpull3]
I've see a thread about the same subject written in 2007 but I can't understand what is the purpose of single segment positional tolerancing (section 7.5.2 ASME Y14.5 2009. I would like it explained with simple words...
Hello,
I apologize in advance for English is my third language and I fear it is very difficult for me to translate my toughs on this one.
On figure 4-48 of asme y14.5 2009, looking at the 12.32-13.08 hole, there is a position box?? that says there is a .3 tolerance at LMC of the hole per...
Hi everyone
I am studying to pass my GD&T certification and I felt like taking a break by trying to create some of the example in CATIA (how to make a dry subject juicy right!!!) but I am not able to add the MBC on the datum while creating a semantic dimension.
If your confused about MBC, it...
Hi,
I am studying to pass my ASME Geometric Dimensioning and Tolerancing Professional technical level certification. I am reading in asme y14.5-2009 (yeah I know it's not the version of the test, I just find the explanations better in than the 1994 version), and as I am reading the paragraph...
Hello
I read and I understand the LMC and MMC. I can think of a dozen example of where I could use MMC but none of when LMC could become useful: having bonus when you have more material??? Can you give me a real life example please? I doubt that it is a theoretical concept.
In Sketcher, when creating a dimensional constraint, it is possible to right-click in the numerical field and add a tolerance.
I have never used it thinking it had something to do with clash analysis but It doesn't seem to help clash analysis.
I then though I would be usefull for FT&A module...
HEELLLPPPP!! I think I'm going nuts!!!
when I try to create a line ID I get this error message:
Command not allowed
'set a directory for line lists in project XML file that has write access"
I Tried SO MANY things and searched a lot without any answers. I found the Project.xml file. tried...
Hi everybody,
One question that is REALLY bothering me: what is cross pin axis diection in DMU Kinematics U-joint definition? I have no Idea what it means but I hear from some of my customers that it created problems when the wrong one is selected.
