MEC 1012 - Assignment 4
Due in lab week 7
mechanical assembly (in
metric units) that includes several types of adaptivity, a
and a cast or molded part. Also, demonstrate use of orthographics to
your design (check sections). Assignment 5 will ask you to produce the
of working drawings and track revisions.
If you'd like some
consider using this press concept.
(hit links for details)
- Illustration Highlighting Adaptivity by:
- Algebraic Equation
- Model Parameters
- User Parameters
- Linked Parameters
- Embeded Parameters
- Assembly Constraint
- Derived Part or Assembly
or Molded Part
- Metric units?
- Illustration Highlighting Adaptivity - Make sure
clear exactly where you have demonstrated what. Consider using a .idw
with a labeled view of your assembly or provide a labeled sketch (example)
- Algebraic Equation - a relationship that uses
.Inventor calls its variables 'parameters' and allows you to call on
current value of a parameter by including the name of the parameter in
equation (ex. d0=10in, or Wall=2mm, or
Parameters - These are created when you add general dimensions
features to the model
by default d0, d1 etc.).
Parameters - These are predetermined numbers/algebraic equations
of features. These are best for values used repeatedly such as draft,
thickness and so on.
- Linked Parameters -These are laid out on a
(Excel) and then linked to the model. A value change in the
is immediately reflected in the model. This is a permanent relationship
the spreadsheet MUST reside in the workgroup folder. (Or the path must
designated in the project file.)
How to set up the spreadsheet:
When linking or
the spreadsheet you MUST designate the first cell which has the label
the first row of values. (In the example A5)
- Use A1 to
the purpose of the spreadsheet.
- Add column
in a lower row.
- Use column A to add parameter names.
- Place values
units in the following columns.
- Embeded Parameters - These are initially laid
on a spreadsheet (Excel) and then pulled into the model. The link is
severed to the spreadsheet. Subsequent changes to the original
will NOT be reflected in the model. Instead changes must be made to the
- Projection - In sketch mode use
geometry' to project an existing edge (from the same or a different
into the sketch. The line in the sketch will adapt to changes in the
that was projected.
- Assembly Constraint - By leaving some aspect of a part
(like leaving out a length dimension in a sketch), that part can
made to adapt to other parts in an assembly based on assembly
For example, a block (with length unspecified) could be
inside a box and mated to opposite inside walls of the box. The
of the box would then drive the block. You must have the sketch as well
the feature and part designated as adaptive.
is active when you see the swirling arrow symbol:
- Derived Part or Assembly - This allows you to use an existing
as the base for a new part. It allows you to scale an existing part
create a mirror image of the original. You cannot modify the derived
but you can add new features. If you change the parent model these
will be reflected in the derived part. Derived parts also allow you to
working drawings at various stages of manufacturing (for example, you
show machining features that are added after welding or casting by
the final part from a weldment or part that models the cast features. Consider checking out a how
to article on deriving a weldment for specification of post-weld
You can also use basic sketch geometry for a derived part to drive
- Weldment - This is an assembly mode
the application menu) that allows you to add welds to your parts. If
is an intermediate step in your manufacturing process you will need to
"save copy as" to create a copy of the model before welding. There will
drawings done at this point for the fabricators. Then you will
the welds using the specialized commands:
All of these
be specified (dimensioned) on the new .idw's that can now be generated
for these processes.
you add chamfers for the welding bead
designate the surfaces that touch the bead
are post-welding processes that finish the welding stage
or Molded Part - In casting (metals) or injection molding
molten (liquid) material is forced into a hollow space between shaped
of steel (the mold).
that allows part to release from mold
Concave on steel/ convex on part
(the outside cosmetic surface)
Convex on steel/ concave on part
(the inside where the knockouts show)
between Cavity & Core
Specifications for casting:
60% of Wall Thickness (1.5 mm), Min 1 mm
Specifications for injection molding:
60% of Wall Thickness (1.2 mm), Min .5 mm
Sections - Use a .idw sheet with section views to see critical aspects
your design more clearly. Is your draft tapered the right way?
your ribs too thick?
do not hesitate to use “help” both locally and at the Autodesk web
Also, there are numerous samples in the application that can be very
in using a new series of commands.
For your pleasure
is a gear blank available at V:/MEC/1012/Templates & Blocks. It is
on a spreadsheet. You may copy it to your folder and modify it there.
you are encouraged to use standard parts from the library or from
sites off the web.
Please send us any other
sites you find so we can add to this list:
Links: (use the Back button to return to this page)
Developed by Mary Waldo and Paul Johnson
- Here is a .pdf of
configurations of circlips
- Apex Fasteners for mechanical
- More fasteners
- Multiple sites for gears of
- Thomas Register-The BIBLE of
of things mechanical
example of A to Z in new product development
- More fasteners BUT check out the
Tutorials and How To Articles
Tap Drill Chart - ex. H drill for free fit clearance on