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Purpose of grid drawings 3
- Thread starter Azzazil
- Start date
GregLocock
Automotive
That's a rather simple layout drawing. So in the olden days on one wall of the drafting office there was a full size section through the car, with a 4" grid on it, and all the major components and the driver and passengers all in place. Then you fiddled around with all the bits until they fitted and met your requirements.
These were then used to generate various servicing, shop and repair manuals, like this one
Quite what use your example is to anybody other than model makers, I'm not sure.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
These were then used to generate various servicing, shop and repair manuals, like this one
Quite what use your example is to anybody other than model makers, I'm not sure.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
What you show is an example of coordinate dimensioning, where the values (dimensions) are relative to the 0.0 origin in the X, Y, and Z directions. Commonly used in automotive and aerospace to reflect relative position in an assembled context.
"Know the rules well, so you can break them effectively."
-Dalai Lama XIV
edit: what Greg said...
"Know the rules well, so you can break them effectively."
-Dalai Lama XIV
edit: what Greg said...
GregLocock
Automotive
here's the sort of thing you'd see pinned to the wall, except they've dimensioned it rather than using grid
and here's one using grid
Incidentally when we talk about hardpoints we often still refer to coordinates referenced to these grids as 'grid', as opposed to whatever LFOR the component is drawn in.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
and here's one using grid
Incidentally when we talk about hardpoints we often still refer to coordinates referenced to these grids as 'grid', as opposed to whatever LFOR the component is drawn in.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376
- Thread starter
- #5
Thanks for your reply. What is with the drawings for separate component on car like panels or other parts? There I have also grid relative to 0 (center point in car zero) in X,Y and Z direction , but without any proper dimension of thickness and size/position of the holes on the part.
Here is example
Can this kind of the drawing be considered as production drawing? Or the purpose of this drawing is just to show relative position of the part and overal dimensions of the part which you can read from the grid?
Sorry for my ignorance but I never saw mention of this kind of the drawing in GD&T standards as ASME Y14.5 and ISO 1101.
Here is example
Can this kind of the drawing be considered as production drawing? Or the purpose of this drawing is just to show relative position of the part and overal dimensions of the part which you can read from the grid?
Sorry for my ignorance but I never saw mention of this kind of the drawing in GD&T standards as ASME Y14.5 and ISO 1101.
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- #6
Um - what? Is there some concern that those airplanes, trains, ships, cars, and thousands of other items built before 1960 or so sprung out of thin air? Clothing patterns for fabric are still done this way. No Y14.5 in sight.
It is a drawing that is used to create parts. It's not a part acceptance drawing - it's a drawing that would be used by tooling engineers and tool makers to create the dies to create the parts. Those would be used for prototype tooling which would then make prototype parts and then the corrections to fit all the parts properly would be identified and incorporated into the tooling and fixtures for production.
Next question, no doubt - how did the Great Pyramid get built before laser levels were available?
Oh the mysteries of the past!
It is a drawing that is used to create parts. It's not a part acceptance drawing - it's a drawing that would be used by tooling engineers and tool makers to create the dies to create the parts. Those would be used for prototype tooling which would then make prototype parts and then the corrections to fit all the parts properly would be identified and incorporated into the tooling and fixtures for production.
Next question, no doubt - how did the Great Pyramid get built before laser levels were available?
Oh the mysteries of the past!
- Thread starter
- #7
3DDave said:
Thanks 3DDave you are helpful as always. Don't mind me for stupid question, what info from this drawing can take tooling engineer since there are no any dimensions on it and tolerances, that can clarify to tooling engineer which features are important and thier precision during production of die?
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- #8
Here's a bunch of videos to tools that, like grid drawings, you will never have to use:
- Thread starter
- #10
3DDave said:
![[king]](/data/assets/smilies/king.gif "[king] [king]")
That is why I am asking. I saw one drawing from one of our supplier that had those grids and I was confused since I saw it for first time, I was thinking that it was part of some kind of automotive standard.
If this kind of the drawing is oboslete or is not used anymore I won't bother myself to figure out why supplier send us drawing of one part with the grid.
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- #12
Grids are still common today. Dims are charted rather than placed in a view bc they're variables. On a truck assembly print the same rear bumper might have 25 different positions due to wheelbase variations, so its easier to have one print with a chart showing the variations rather than multiple prints. Similarly, on a frame print the "same" hole or other feature might have 25 different locations bc of different wheelbases.
- Thread starter
- #13
3DDave said:
If I am able to ask them I would ask, since I am not I am asking here.
CWB1 said:
![[thumbsup2]](/data/assets/smilies/thumbsup2.gif "[thumbsup2] [thumbsup2]")
In this case can I consider usage of grid when I want to show position of part on the car, and for the parts that can have different positions in assembly since you mention bumper which can have 25 different positions due to wheelbase?
That's too bad. I've never had a case where drawing just showed up and there was no one to ask what they were for. I assume they also didn't ask that you do anything with them and so you can safely ignore them. Tell your boss that you will just ignore them.
- Thread starter
- #15
I can only tell you what they were used for. Only the one who made that drawing that you have can tell you why they made it and since you won't find out from them you will never know.
I am beginning to think they sent it just to annoy you and it is working.
I am beginning to think they sent it just to annoy you and it is working.
- Thread starter
- #17
I said to you I am not able to ask them and I don't have time in detail to expalin to you how that happen. Anyway if you can tell for what they are used for, it would not help only me but also other members of this forum when they will search for purpose of grid drawings.
- Thread starter
- #19
I came recently in company, and I was checking documentation of some parts and found a drawing with grid lines. When I asked my colleagues why this drawing have grid lines, they told me that they don't know, they just accepted it as that and save it in documnenation database(as you said they just ignore them). Since this drawing was sent to us 5 years ago, we are not in communication with this supplier, and at the moment doesn't make sense to pop-out and ask them for the grid on the drawing.
Anyway I googled and manage to find maybe the defintion and purpose of those grid lines on the internet.
Anyway I googled and manage to find maybe the defintion and purpose of those grid lines on the internet.
That's what those values on the X and Y and Z axes in algebra when graphing functions were all about, to show the dimensions of the curves at various locations. I think a refresher on how graphing works is in order for your co-workers.
Had you looked at the link to the old tools, one of them is to scale dimensions from drawings like this. specifically.
Also, and this is important, quotes from other websites should have the link to the website.
Had you looked at the link to the old tools, one of them is to scale dimensions from drawings like this. specifically.
Also, and this is important, quotes from other websites should have the link to the website.
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