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ENGINEERING PROCESS GUIDE

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Drawing Checking Guidelines

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    Purpose:

    To provide general design and drafting standards to the Engineering Division. These standards will be used for filing, checking and detailing of all designs. The guidance is based on generally accepted methods in industry along with practices developed within the Engineering Division.

     

    Overview:

    • Checking of detail and assembly drawings
    • Detailing of working drawings.
    • Notes generated to provide guidance on fabrication of parts.
    • Standard ASME Y14.5M 1994 Dimensioning and Tolerances to insure proper fits.
    • How to release models and prints within the proper database.

    Checklist for Drawing Checking:

    Check Title Block:

    • Drawing number
    • Title
    • Revision and revision description
    • Category Code
    • Tolerances including angle and surface finish
    • Scale
    • Material

    Read notes:

    • Check spelling.
    • Check to see if flagged notes reference the proper callouts.
    • If special instructions are required, (heat treating, pressure callouts, ect..) make sure the information is correct.
    • If Eng. Notes are referenced check to see they are called out properly.
    • If any torque values are called out check to see the value is correct.

    Detail Drawing:

    • Material, type and size
    • All views should be orthogonal and placed properly (e.g: section views should be opposite direction of arrows.
    • Overall size of part, length, width, thickness
    • Identify all Datum's
    • Check to make sure all other features are dimensioned.
    • Check to make sure all ASME is being used correctly.
    • Check to make sure dimensions on all parts correspond to dimensions on all mating parts.

     Assembly Drawings:

    • Check Title block and Notes, see 1 and 2 above.
    • Check each item in the BOM to make sure quantity and item number are correct.
    • All views should be orthogonal and placed properly (e.g: section views should be opposite direction of arrows.
    • Follow assembly instructions to see that all information is correct and understandable.
    • Check all reference dimensions.
    • Check that all views have a corresponding scale.
    • Make sure all mating parts dimensions are correct.

    General Drafting rules:

    • All views are to be orthogonal unless it absolutely cannot be avoided.
    • Do not overcrowd a drawing. Paper is cheap.
    • Unless it is difficult to do, all sections shall be in line with their parent view.
    • Do not dimension to a hidden line.
    • Do not place a dimension inside geometry.
    • All circles and cylinders shall have centerlines.
    • Dimension to centerlines when necessary.
    • All centerlines of holes in line with each other should be connected if the dimension does not call out the quantity.
    • All dimensions shall be placed evenly apart from each other.
    • Maintain consistency (e.g note callout, dimension size, feature callouts, ect.).
    • If a view does not show all information, it should be noted as such on the view. (ie: PARTIAL VIEW FOR CLARITY)
    • If a detail is rotated with respect to its parent view, it should be noted as such on the view.
    • Any repeated dimension on a drawing shall be put in parenthesis or the abbreviation "REF" shall be placed by the dimension or call out.
    • All dimensions shall have a tolerance, either called out on the dimension or callout itself or by using the appropriate box in the title block.
    • Unless unavoidable all weldments are to be considered one drawing.
    • Assemblies should have the weight called out.

    General Modeling Rules:             

    • When using step models from a vendor, do not use unnecessary objects i.e threads or vendor imprinted names.  
    • Unless unavailable use the Feature Machining menu to show all types of holes.
    • Unless unavoidable model all parts to the nearest tenth or fraction, depending on unite you are working in.

    DOCUMENT INFORMATION

    Title:

    Drawing Checking Guidlines

    Document number

     

    Revision number

    1

    Publication date:  
    Effective date:  
    Next review date:  
    Last Edited By: Mark Coleman

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    Reference

    EPG Section (cross-reference)

     

    Functional Division

    Engineering

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