|
MasterCam Soap Dish PowerPoint Presentation
Narrative:
You are on a product design team responsible for designing a tray for
a bar of soap that will prevent the soap from dissolving from excessive
water contact. This will require the soap cavity to have several raised
features to elevate the bar of soap above the bottom of the cavity. Draft
angles must be applied to interior and exterior vertical surfaces and
be in the range of 8 - 10 degrees. The shelled version of the soap dish
must have a wall thickness of .100”, with the bottom face of the
design excluded from the shell operation so as to remain open. The shelling
function allows the design of objects with thinner walls, resulting in
material savings. This is a critical issue in the design of injection
molds for industrial production applications.
Your team should brainstorm, discuss and then produce a four-view conceptualization
sketch that must be attached to the printed multi-view drawings produced
with solid modeling software. Include the required calculations on the
drawings. A prototype of the solid bottom soap dish design will be produced
on a CNC vertical milling machine.
Concepts:
Extrude, Fillet, Chamfer, Draft Angle, Mass Properties, Creating CNC code,
Fixturing Stock, Robotic Parts handling, Milling Machine Setup, Part Production
Geometric Requirements:
If you have saved your soap dish solid model from Introduction to Engineering
Design, it can be modified following the parameters given below. If you
do not have the solid model on disk, then follow the parameters below.
• The inside cavity must be 0.650 deep and be able to accommodate
a bar of soap 2.500 wide x 4.250 long.
• The outside dimensions must be 1.000” x 3.000” x 5.000”.
• The outside shape does not have to evolve from a rectangular solid;
try using other shapes that will fit in an area not to exceed 24.750 square
inches.
• Use the EXTRUDE-cut option to produce the top inside cavity.
• The fillet radius for all inside corners is to be 0.250”.
• The fillet radius for all outside edges except the bottom, as
well as the top inside edge is to be 0.125”.
• The bottom edge is not to be filleted.
• The area immediately under the soap must have several raised features
made up of narrow ridges or lettering to allow the soap to dry out between
uses.
• Prepare the standard four-view drawing with the appropriate dimensions.
Print on 18 x 24 paper.
Inquiry:
Solve the following using the mass property function and the appropriate
calculations.
A. Find the volume and mass of polyethylene necessary to manufacture 1000
soap dishes if the design has a bottom surface that has been shelled using
a thickness of .100”.
B. What will be the cost of the polyethylene required to manufacture 1000
shelled soap dishes?
C. Find the volume and mass of polyethylene necessary to manufacture 1000
soap dishes if the design has a solid bottom surface with no shell applied.
D. What will be the cost of the polyethylene required to manufacture 1000
soap dishes with solid bottoms?
E. What is the cost savings of manufacturing the shelled soap dish instead
of the solid bottom soap dish?
Other Applications:
What other consumer products would make use of the shell feature to help
produce a product design that uses less material, while still providing
adequate strength to enable it to perform its intended task?
Evaluation:
How closely does the design adhere to the Geometric Requirements?
Supplemental Information:
The density of the high-density polyethylene is 0.034 lbs. per cubic inch.
The price per pound of the high-density polyethylene is $2.25
|