ME317 - Mini-Project 1

Due: December 14, 2015

Assignment:

·  Create a complete drawing package of the assembly composed of the nine parts in Figure 1. The assembly is a from a small air compressor. The assembly is provided disassembled for measurement and as a unit for investigating function and connectivity.

Figure 1. Air compressor, the assembly, and parts to model.

Table 1. Part Names

cylinder / crank / crank pin
wrist pin / connecting rod / clip
shaft / gear / piston

Background:

To be an effective engineering designer your designs must be communicated completely and unambiguously to managers, other engineers, manufacturers, and inspectors. For this project, you will practice metrology skills by accurately modeling part geometry and communication skills by generating a complete drawing package.

Procedure:

·  Work out drawing plan and dimensions before modeling.

·  You will create a paper and pencil plan for the entire drawing package including all details of the exploded view, bill of materials (BOM), numbered parts, part page numbers, and a dimensioned drawing of each part that includes the appropriate views and dimensions.

·  Capture dimensions of the assembly with calipers, micrometers, radius gauge, sine bar, etc.

·  Assemblies are available in the ME machine shop. You are NOT allowed to remove the assemblies from the shop. You must pass the ME shop quiz before entering the shop.

·  You will need to check out metrology equipment from Jerry Leturgez or Mike Fulk using your student ID. Be aware that they are unavailable during lunchtime (~ 11:30 to ~12:30 every day).

·  You should include an acceptable replacement part from McMaster-Carr (or another parts source) for any standardized part that matches the original. Potentially standardized parts can be found for the pin, cylinder, clip and gear, but you may have to model them. Include the part number in the bill of materials (BOM).

·  You don’t need to include some details of the assembly such as the texture on the center head and the lip around the edge.

·  Model the parts/assembly and generate the set of drawings in your CAD package of choice.

·  Use the sample drawing package (Block Project.pdf) as an exemplar for organizing and indexing your work.

Group:

You will work on teams of about three for this assignment.

Deliverables:

·  A complete drawing package which includes:

o  a cover page with names and a compelling picture of the entire assembly model

o  an isometric, exploded, and shaded assembly drawing,

§  The assembly drawing should include a bill of materials that points the reader to each part page and specs for off-the-shelf parts.

§  Part numbers for each part in a call-out.

o  a drawing per part

§  The part drawings must have important principle views and an isometric view.

§  The part drawings do not include features that are artifacts of manufacturing (burrs, broken edge, marks, etc.).

§  An appropriate set of accurate dimensions that follow best practices. The appropriate dimensions includes all critical to function dimensions which must be circled. The appropriate set of dimensions does not need to be included for features that can vary substantially.

·  The paper and pencil drawing package planning document

Grading is based on:

·  Completeness of the drawing package (all assemblies, parts, BOM, part number labels, etc.)

·  Appropriate views shown

·  Accurate dimensions

·  Complete dimensions without redundancy

·  Best practices used to dimension parts (datum, no dimensions on hidden lines, dimension feature on most visible view, etc.)

·  Professionalism


Project 1 Scoring

TEAM:

Category / Weight / Comments / Score
Assembly (Exploded view, BOM) / 35%
Part drawings (Views, Dimensioning, Title block) / 50%
Professionalism (Title page, Organization, Planning, Neatness, etc.) / 15%
Total

I will use this scoring scheme for all projects.

Score / Attribute
4 / Exemplary, insightful, worthy of sharing with entire class
3 / Complete, correct, long-term reference value to self (meets expectations)
2 / Complete, numerous errors, limited reference value to self
1 / Incomplete, major errors, no supporting documentation
0 / Submitted late or absent

+  Grade of ‘A’ corresponds to average on term work above 3.2

+  Grade of ‘B’ corresponds to average on term work between 2.8 and 3.19

+  Grade of ‘C’ corresponds to average on term work between 2.4 and 2.79

Note 1: We’ll figure out where the + grades reside later.

Note 2: If you are asking, “What’s the cutoff between D and F?” you are asking the wrong question.