Engineering III

What Does A Working Drawing Have In It?

A. Detailed drawings are production drawings that show necessary views, dimensions, and notes required to make a part without the use of additional information.  ALL INFORMATION TO CONSTRUCT THE PART OR ASSEMBLY WILL BE PRESENT.

 

B. Number of details per sheet.

       1. All details can be placed on individual sheets.

       2. When large or complicated mechanisms are represented, the details may be drawn on several sheets with several details to a sheet.

       3. If the structure is small or composed of few parts, all details can be drawn on one sheet.

 

C. Drawing standards for details

       1. Attention should first be given to spacing.

       2. The same scale should be used for all details.

       3. Each detail should be represented by the regular views, sections, or auxiliaries needed to describe the part clearly.

       4. Must have all dimensions and notes.

       5. All parts must be identified or drawn with the exception of standard parts.

 

D. Identifying parts.

       1. The old method is to letter a title note under each detail, which would then be circled or underlined.

       2. The new method is to give a parts list or bill of materials.

       3. A bill of materials or parts list consists of an itemized list of the several parts of a structure shown on the drawing. When numerous parts are used, the list can be given on a separate sheet.

            a. Lists part number, title, material, and quantity required.

            b. May include pattern numbers, stock sizes, and weights.

       4. The parts list is located above the title block reading upward or in the upper right corner reading downward.

       5. Parts should be listed in general order of size or importance of details.

       6. Standard parts should be listed even when they are not drawn.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C. Every drawing should have a title strip or title block to show in an organized way all necessary information not shown on the drawing itself. The title strip should contain but is not limited to the following:

       1. Name of the object represented.

       2. Name and address of the manufacturer.

       3. Name and address of the purchasing company, if any.

       4. Signature of the drafter that made the drawing and the date of completion.

       5. Signature of the checker and date of completion.

       6. Signature of the chief drafter, chief engineer, or other official, and the date of approval.

       7. Scale of the drawing.

       8. Number of the drawing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D. Drawing numbers.

       1. Every drawing should be numbered.

       2. It is advisable to use simple serial numbers, but varies from industry to industry.

       3. It is advisable to avoid using drawing numbers to convey other information; however some companies place a prefix such as A, B, C, or D in front of the number to denote the sheet size.

       4. The drawing number is usually the number of the part itself.

       5. The drawing number is bold, ¼” high, and located in the lower right and upper left corner of the sheet.

 

 

E. When a drawing is completed it is turned over to the checker. It is checked for soundness of design, correct views, complete dimensioning, legibility, clearances, materials, standard parts, and title block information.

 

 

F. Change records.

       1. A change strip or revision strip is included at some convenient place on the drawing.

       2. In the change strip, the change is briefly described, initialed, and dated.

       3. The change is labeled on the drawing usually by an encircled letter.