My first job—Junior Drafter. Main duties: make coffee, service the blueprint machine, do drafting in between the first 2 important tasks.
Our blueprint machine was old and high capacity and didn't use bottles of aqueous ammonia—it used a 5 foot tall tank of gaseous ammonia to develop the...
EWH,
I could never see the non-print blue lead because I used the blue grid vellum. So, I found that a very sharp, light pressured RED lead was very visible, but never printed.
Drove more than one manager nuts to see a complete drawing laid out in red, then done in H or 2H for the finished...
Why there could be a centerline. By attaching a datum in-line with the dimension arrow it indicates that the feature is a datum (also, the fact that Datum G is accompanied by MMC in all the FCF). And that feature creates a datum plane at the center of the feature, represented on the drawing by a...
The spherical portion of the part is inadequate for a datum, as any datum radius must have more than 180° to be used as a datum. It has to be captured to adequately nail down the location the datum feature. (I hope this is making sense--it's a lot clearer in my head!)
I would use the feature...
Descriptive Geometry was the graphical method of developing a "true shape" view--i.e. a view perpendicular to the surface--that is not an orthogonal view. With solid modeling it is about as useful as using trigonometry to find an angle or a length. The computer does it faster.
All this calculating is fine, but the whole point of True position GD&T is to buy off the parts that would normally fall outside the square tolerance and within the circular tolerance. Additionally, it allows for easier calculation of mating holes and "bonus tolerance."
So, if the problem is...
yOU CAN UP THE SCALE IN VIEWS OF A DRAWING, BUT THE SCALE OF THE SHEET (THE SCALE LISTED IN THE TITLE BLOCK) MUST BE THE SAME ON ALL SHEETS.
iT'S THE RULE.
An item no. can be used in a balloon as many times as is necessary. When it becomes a ref is if a particular instance of an item is called out again.
For example: I have in my BOM items 1 (screw), 2 (lockwasher), 3 (flatwasher), & 4 (nut), qty of 12. My drawing has two paterns of these screws...
That would be clearer, but now you have another problem. If the large bore ever changes size you have to remember to change all the dimensions that have that diameter referenced in them.
This is why most of the companies I have worked at in the last 7 years have used separated computerized BOMs. Maybe it is because I have never used them regularly and have too little experience, but I find the BOM function in SWx to be too dificult for the type of drawing we tend to make. My...
ewh:
That's the same diagram as the Global DRM folding guide. It probably comes from a MIL or DoD standard.
SMcadman:
Ouch! Thanks for showing me what 388196 meant by oversize.
355196:
Sorry for misunderstanding the oversize drawing part of your post. But I agree with Timelord. All sheet sizes...
Here is a common situation on an assembly drawing. Drawing a full -002 configuration would be a waste of time and... um... paper?
At the bottom of a drawing view:
-001 SHOWN
-002 IS SAME EXCEPT AS NOTED
On the face of drawing there is a stacked bubble pointing to a pattern of 4 screws. One...
This is becoming an increasingly held misperception. When you plot a D size drawing at 22 X 34 it is not an oversize drawing--it is a full size plot. Just because we commonly plot a D size as a half size 11 X 17 plot doesn't mean it is a B size drawing--it is a B size plot.
As for folding a D...
