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Mechanical Engineering Technology

MEC 1011

Assignments

MEC 1011 - Design Communication I
Assignment 6
Part Documentation and Sheet Metal

Due at the end of our ‘Lab’ meeting in Week 4

First, make a new project file (.ipj) in V:/MEC/1011/Fall_05/Assignment6/TXA/Yourname

PART 1 – Use Inventor to produce a working drawing of your paper weight

1.     Model the paper weight with Inventor (.ipt ).

2.     Open a new drawing file (.idw). Set sheet size to A (portrait or landscape). Use the ANSI standard border and title block.

3.     Place the base view of your Paperweight in the .idw, and then project the other necessary views and an isometric view. Include hidden lines only where they add clarity.

1.     Fully dimension and tolerance the drawing. Stock sizes should be found on this list of preferred sizes (consider a fractional dimension style for stock to indicate that no tolerance applies). Demonstrate the use of flatness and orientation (parallel or perpendicular) geometric tolerances. Use hole notes where appropriate. Remember to tolerance all angles.

2.     Hand in a print of the drawing at a 1:1 scale (the drawing can have any standard and appropriate scale, but the printing process should be set to 1:1).

PART 2 – Model a sheet metal enclosure

Conditions and Objectives:

        Reference the given sketch (Pen version for printing) and this example.

        Material thickness for both pieces will be assigned to you. For your reference, here’s efunda’s Sheet Metal Gage Calculator and their Gage for Common Sheet Metals. Also you might look at SheetMetalDesign.com and their table of gage number’s and sheet thicknesses

        Model all other dimensions at decimal sizes of 3 places or less (i.e .020 or 1.031 but not 2.3452383).

        The base and top will have a “line to line” fit, which means that the interior dimensions of one piece will be exactly the same as the exterior dimensions of the second piece where the two pieces mate together.

BASE:
        Use Contour Flange or Face and Flange to form bottom and sides.
        Use Punch Tool or Insert iFeature to emboss feet (Punches/Round Emboss.ide).
        Use Cut and Rectangular pattern to model the vents.
        Use Flange on both ends with holes at the minor diameter of 6-32.
        Use Fold to fold in sides to expose handle. Avoid exposing sharp edge at limit of hem on the cover (Ex. with a 1” hem on cover overhanging .25 you wouldn’t want to fold in more than .70).
COVER:
        Use Hem to hem as much of the cover as practical. Hem generously where the edges of the cover are used as handles.
        In the front use cut to form a ” hole for a button and a rectangular opening in the front for a keypad opening. This opening must be 1 ” x 2 ”.
        Use iFeature or Punch Tool place a D-Sub Connector-4 opening on the rear of the enclosure. Locate it in the exact center of the back.
        Line up .150 thru holes to the #6-32 holes on the base.

        Create a flat pattern view of one of the parts and place it in an .idw