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Engineering Drawing Checking
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Posted by: Cragyon ®

05/11/2005, 08:12:37

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Hello everybody, I would like to open a discussion on technics used to review or check a engineering drawing before initial, change incorporation or final release.

Currently, within our organization, we have a design manager at a different plant whom is responsible for check and release of any drawing. This works ok, however we never have face to face communication and some of his redlines are less than clear. Additionaly, he has inplemented drafting requirments and not asked our facilities opinions regarding these drafting /drawing standards.

Now back to how I check my own drawing. We use Solid Works software, I normally print out a "B" size and manually check the drawing for errors, omissions and clarity. I typically do this only one time before I sibmit my document for review and release. When I have a complex drawing I will print and check the drawing a second time.

Now to be honest, most of my drawings do require a change to fix somthing.

So, how does your organization handle checking?














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: Engineering Drawing Checking
: Engineering Drawing Checking -- Cragyon Post Reply Top of thread Engineering Forum
Posted by: vp ®

04/07/2009, 03:22:27

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I would like to know what if any experience or qualifications you need to check drawings of any discipline

vp














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Re: Engineering Drawing Checking
: Engineering Drawing Checking -- Cragyon Post Reply Top of thread Engineering Forum
Posted by: joeb ®

11/23/2005, 16:10:35

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We model our designs in SolidWorks and we execute the drawings in AutoCAD. The design goes through a checking process that typically includes a formal design review, and the solid models play a significant role during this review. The drawings go through a separate process that focuses on the drawing itself more than the design.

The engineers in our (small) group typically check the drawings. The procedure begins by creating a small matrix adjacent to the bill of materials (BOM) on the first sheet. The rows of the matrix correspond to the items in the BOM, and the five columns of the matrix are labeled "C", "D", "P", "W", and "Q", which stand for Call-out, Dimension, Place, Weld, and Quantity. Each cell in the matrix is filled in as the item is checked in a particular category.

The Call-out check ("C") verifies that the item number in the BOM matches with the call-out number on the drawing, and that the item is properly called-out on the drawing (correct call-out location, called-out in each location). The Dimension check ("D") verifies that each item and all features are properly dimensioned, and this will include a check of the tolerance stated in the title block. The Place check ("P") verifies that an item in an assembly or weldment is properly located both graphically and dimensionally. The Weld check ("W") verifies that welds are correctly specified both in format and design intent, and that the weld as specified can be manufactured. The Quantity check ("Q") verifies that the item quantity indicated in the BOM is correct for all configurations.

This system has been in use here for many years, and it has proven to be effective in minimizing both drafting and design errors.

Joe














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Re: Engineering Drawing Checking
: Engineering Drawing Checking -- Cragyon Post Reply Top of thread Engineering Forum
Posted by: sfarkas ®

05/13/2005, 10:15:17

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Hi, my method is following: to chceck if there are all necessary dimensions of the detail I hand draw it on paper and check if every contour or feature has been dimensioned. Once this is done the next step is check the tolerances, I do the tolerance analysis of each fit in each direction, it is time consuming but very helpfull. I would also mark each dimension that has been checked on the printed copy, this way you will reduce the probability of mistake and /or find some new issues that might be re dimensioned´: I am using OneSpaceDesigner by CoCreate, in the older version had often happened that the dimension vertex slipped off to other vertex.

Our organisation of checking is that the drafter (creator) draws a drawing and the engineer (checker) checks functionally, approver chcecks it again however mainly for formal notices. I would give your drawing to chceck to your kollege before you submitt it to desigh manager.

Stefan














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Re: Engineering Drawing Checking
: Engineering Drawing Checking -- Cragyon Post Reply Top of thread Engineering Forum
Posted by: randykimball ®

05/12/2005, 23:55:49

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My method, and yes I find errors in my work too.
I too, use Solid Works. I prefer to make a temp or use a real assembly model. If there is no real assembly model I make one to bring the mating parts quickly together and constrain them only enough to prove fit and function. At this stage I make mental notes of mating threads, bolt holes that fit the bolts OD and match the threads, bearings, etc. Then I prefer to print an 11 X 17 of the drawing and highlight each and every feature of the part being sure they all have the required dimisions and notes to establish what and where they are to the shop. .... I still do get questions from my vendors.

There is no perfect way. ... and time is always the shortest supply of all assets.

I'm looking forward to more responsses and ideas.

-randy-











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Re: Engineering Drawing Checking
: Re: Engineering Drawing Checking -- randykimball Post Reply Top of thread Engineering Forum
Posted by: Kelly_Bramble ®

05/13/2005, 08:18:57

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Definitely, the 3D model is just as important as the engineering drawing. At the last company I worked at, we used Solid Edge, which is comparable to Solid Works. Checking each part within the assembly model was an important step. I would use both visual and software processes to ensure I did not have excessive clearance or unintended interferences. We had a command which would check for interference between all parts or just one part to all other parts within the assembly. Running this process was real piece of mind. Generally, checking the model and the engineering drawing is a collaborative process. Often I would find a design flaws while creating my engineering drawing.

I'm sure, all of us are aware that one oh #$%^&*@, takes about one thousand "good job" to offset.














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Re: Engineering Drawing Checking
: Engineering Drawing Checking -- Cragyon Post Reply Top of thread Engineering Forum
Posted by: Kelly_Bramble ®

05/11/2005, 22:24:57

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The best method I found for myself was to print out a easy to read sized drawing, B size minimum, C size preferred.

Then, using a yellow (arbitrary color) high-lighter, I would systematically mark through each dimension and tolerance specification, notes and drawing views as well which I found to satisfactory. I would use a red ink pen to make notes, or indicate a change.

When I incorporated my markups, I would use a green high-lighter to mark over my red lines / notes.
Following incorporating my markups, I would print out the drawing again, and contrast my markups to my new drawing.

I found that the double checking step to be the real work saver.













Modified by Kelly_Bramble at Wed, May 11, 2005, 22:26:23


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Re: Engineering Drawing Checking
: Re: Engineering Drawing Checking -- Kelly_Bramble Post Reply Top of thread Engineering Forum
Posted by: swearingen ®

05/14/2005, 23:26:43

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Our company has very strict rules on checking and checking processes. It goes like this:

1. Once the drawing is "complete" (fully developed and the engineer and drafter agree that it's ready for production), the drafter prints it out and does a yellow, red, blue and green markup starting from the top left and working to the bottom right. Yellow for OK/checked, red for add, blue for notes and green for delete. This includes the border, notes, spelling, dimensions, tolerances, fit, interference, everything. Anything found is corrected.
2. The drawing goes to the lead designer of the group and he does a cursory check - usually just fit, presentation, and consistency with other drawings in the set.
3. It goes to the engineer who does a top left to bottom right complete check as well.
4. At this point, it goes back to the drafter to do the corrections.
5. It then goes to someone in the same discipline who has nothing to do with the drawing for full checking. This is where many things are found. The fresh eyes pick up things the last three people miss. Corrections are again made here.
5. From there, it is joined with the other drawings in its package and sent to ITR (independent technical review) where an engineer of the same discipline checks it against the rest of the drawings for fit, constructibility, code compliance, etc. Corrections are made.
6. The drawing package then goes to IC (interdisciplinary check) to be checked against drawings of the other disciplines that it meshes with.

A check sheet follows with the drawings for each person in the chain to sign off and date.

For large packages, this becomes a real pain, but it really helps find errors large and small. Even if something slips through the cracks, you can trace where it came from and get to the bottom of any problem.














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: Re: Engineering Drawing Checking
: Re: Engineering Drawing Checking -- swearingen Post Reply Top of thread Engineering Forum
Posted by: md_ramesh ®

05/15/2009, 21:39:38

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Hi folks,

Our organization is looking for tools that can aid in digital checking of 2D drawings and 3D models for dimensions, tolerances, etc. Are you aware of any tools that can help with this?

Thanks,
Madhu














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