METBD 111

ACTIVITY 8 – Key Seat Design Relations

Why:

To put what you have learned about relations to the test in a real world application problem.

Learning Objectives:

  1. Build a datum plane tangent to a surface.
  2. Be able to use relations to drive the geometry of the shaft keyseat.
  3. Properly dimension a keyseat (slot).
  4. Create a broken view.

Performance Criteria:

  1. The datum plane geometry of the shaft is properly built.
  2. The relations created drive the geometry properly.
  3. The drawing is properly dimensioned.
  4. The drawing views are properly broken.

Resources:

  1. Pro/E On Line Help – Pro/E Foundation – Working with Model Properties – Relations – Conditional Statements.
  2. Class notes
  3. PennStateErie – Engineering Graphics Standard
  4. Other students

Plan:

  1. Read all of the instructions BEFORE completing step 2.
  2. Model a simple shaft using any dimensions.

Part Name:Shaft

Material:AISI 316 Steel

Drawing Number: C-111-00X-11

  1. Apply a chamfer to the right end using Feature – Create – Edge - Chamfer – 45 x d….. Create a keyseat by sketching a Slot using an inserted plane(s). Study the proper way to dimension a keyseat and set up the datum planes so the proper dimensions will be displayed in the drawing file.
  2. Use the following Key Relations Table to build relations for your slotted shaft:
Nominal Shaft Diameter / Key Size
Over / To and Include / Width, W / Height, H
7/8 / 1-1/4 / 1/4 / 1/4
1-1/4 / 1-3/8 / 5/16 / 5/16
1-3/8 / 1-3/4 / 3/8 / 3/8
1-3/4 / 2-1/4 / 1/2 / 1/2
  • Build a set of relations that will select the dimensions of the keyseat, using the key information supplied in the table above. You will need to use four if-blocks.
  • Build a datum tangent to the bottom of the shaft, parallel to the Horizontal datum.
  • Build an offset datum parallel to the tangent datum. This datum will be at the bottom of the keyseat and will be the sketch plane for creating the cut that makes the keyseat slot.
  • The offset distance is the shaft diameter minus half the key depth minus the Y-value shown in the figure on the next page.

  • Whenever possible, use the variables shown above in your relations.
  • Test model before moving on. Be sure to use dimensions for each diameter category and outside the categories.
  • Create relations that will define the end chamfer as the following:

Nominal Shaft Diameter / Chamfer Size (inches)
Over / To and Include
7/8 / 1-3/8 / 1/16
1-3/8 / 2-1/4 / 1/8
  • Test model before moving on. Be sure to use dimensions for each chamfer category and outside the categories.
  1. You are to create a drawing of the slotted shaft for each of two size cases. You are to use the same drawing file for both cases by changing the appropriate sizes and ‘touching up’ the drawing by re-centering the views and moving the dimensions as necessary.

Case 1:

  • Drawing Number: C-111-00x-11A
  • Shaft OD: 1.00
  • Shaft Length: 15.00
  • Keyseat length (center to center): 12.00
  • The location of right side of keyseat (center of end mill plunge) from the right end of shaft is 1.50.

Case 2:

  • Drawing Number: C-111-00x-11B
  • Shaft OD: 1-3/4
  • Shaft Length: 12.00
  • Keyseat length (center to center): 10.00
  • The location of right side of keyseat (center of end mill plunge) from the right end of shaft is 1.00

Create a fully dimensioned detail drawing similar to the one shown below.

  • The front view is a General – Broken View, the top view is a Projected – Broken View, and the right side view is a Projected – Section.
  • See the Penn State Erie – Engineering Graphics Standard for proper methods of dimensioning chamfers, slots and keyseats. Additional information can be found in Figures 9.54b and 9.56b of the text.
  • Shaft and keyseat length and length location dimensions should be dimensioned using two place decimals. All other dimensions are three places. Use a general tolerance of .01 for two place dimensions and .005 for three place dimensions.
  • The view break should be proportioned similar to what is shown below, relative to the diameter of the shaft. Hint: The scale was set to 1.00 in the figure below.
  • Print the drawing.
  • Save your relations to a text file. Add your name, METBD 111 and the date at the top of the file. I expect to see appropriate comment lines, use of appropriate symbols, and statements that take shaft diameters from 7/8 to 2-1/4 into account for both defining the keyseat and end chamfer. Print your relations.

  1. Staple all the sheets together in the following order:
  2. The relations file
  3. Case 1 drawing
  4. Case 2 drawing

A8-F04-KeySeatDesignRelations.docPage 1 of 3

Revised 10/17/04