Manufacurability

DFMA
Design for Manufacturing and Assembly

http://www.qmed.com/news/thoratec-lvad-recall-gets-class-i-status

↑Moral of the true story?

The deaths and serious injuries were not the result of device failure...It doesn’t matter how error free a device is in its mechanics or electronics if people can’t figure out how to use it.

Works in CAD?  Great! → you're 1% of the way there...

• How are the parts going to be manufactured?
• How is it going to be assembled?
• How easy and uncomplicated is it to use?
• How easy is it to maintain? to clean? to fix?

Rules of manufacturability:

1. Keep it as simple as possible.

2. Start early with a prototype, and put this prototype into the hands of the people who are going to use it.

Prototypes should be

•        Simple and uncomplicated
•      Should not have all the details worked out
•     "Rough Draft", unpolished, just good enough to get the main idea of the thing across.
•     Pass prototypes around early in the project & get as much feedback as possible - then act on the feedback.

3. Pay attention to standards and regulations.

    Standards and regulations = words of advice from wise people who have been working on this type of thing a lot longer than you have.

4. Minimize Production Cost

     - Costs of components

     - Costs of assembly 

           minimize the number of parts

           create multi-functional parts

           minimize the assembly steps

           Use modular designs

Use standard components.

fabrication - painting, polishing, surface finishes, tolerance levels...

Bottom up assembly

Use Self-locating, self-aligning features

Exercise:

Pick an old phone, printer, bike, toy, pen - something requiring assembly.

Take it apart 

- how many pieces does it have?

- is each piece absolutely necessary?

- How you redesign it more efficiently?

Tolerances in Inventor

Open up a new standard mm ipt

Create Exercise 10 

Don't forget to save!!

 Open up an idw with your title block.
Right click on your sheet, edit, change to "Portrait"

Create a Base view of your object:

Create a sectional view: 

 Add extension lines by just adding a dimension, hide dimension value, and type space where the text is.

Scroll down in symbols until you find Datum: 

Add Datum labels to your surfaces.
Right click→continue when you have your label positioned correctly 

Experiment with the different tolerance labels: 

Use Symbol→Feature to add geometric tolerance symbols and notes:

Play around with some more tolerance styles while dimensioning.

 

Save, and turn in both your ipt file, and idw file to the Ch7 dropbox!

dbl Pen Presentation

 Inventor Presentation

** Save Often!!  **

New→Presentation

Click on the arrow next to New to pull up the same units and format as you previously had open, or click on the word "New" to pull up the menu that lets you choose units and specific formats:

arrow→generic

click on word→specific formats

You can insert your assembly into the presentation when you first create the presentation 

Or you can "cancel" out of the opening screen,

 open up a blank presentation, and "Insert Model" later

Your opening screen should have a model space, snapshot views, 

a storyboard, and ribbon with tools.  If you are missing anything, 

just go to View→User Interface→click on all of the tools you want to have access to

Have a look around in the model tab - you can access each part in your assembly here, 

modify your drawings, turn visibility on or off, etc.

Right click on the corner of your view cube, experiment with the different presentation views.

Position your assembly with a clear orientation

Click on "New Snapshot View" to snap a picture,

then right click on the view to rename, make a jpg, etc.

Pull the slider on the storyboard to some time (4 seconds) to start creating a movie

Tweak components→right click on one of the arms, and pull it away.

To showcase your work, take all of the pieces apart, and show how it is assembled.

Choose the time for your animation, if you want a trail etc.

After you click on the green check mark, your tweak shows up in your storyboard.  

Play the movie, click and drag the animations on your storyboard to change the time and order

Try out a rotational tweak, and notice where the tweaks are being stored in your model space

and in your storyboard.  Drag the blue rectangles in your storyboard to change the time

and order of the animations

Take apart and move each piece in your assembly to allow viewer to clearly see everything:

capture camera - 

rotate assembly to a new view

click on capture camera

adjust timing in the story board

Experiment with some of the visual styles and backgrounds:

When you are finished, save the video!