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The purpose of Main/Lab4 is to give you practice with assemblies and drafting and to think about practicalities of designing mating parts. You will be reminded of the basics of fits and tolerances at the beginning of the lab session, but you can also refer back to the lecture given on this topic back in ME3910.

• ME3910 Lectures
• Fits and tolerances lecture
• Fits and tolerances notes

• Lab 4 is posted here.
• Click here for link to information listed below on this week’s CAD tutorial on Sweeps and Blends.
• The parts that you will need for this assignment are located below.
  • Parts for assembly in ProE Wildfire format (note that these are in ProE WF2 format, but should import into ProE WF3 without a problem)
  • Parts for assembly in SolidWorks format (note that these parts were made in a previous version of SolidWorks (2005), but should import into 2006 or newer versions of SolidWorks without a problem)
  • Parts for assembly in iges format (this is a general exchange file format that you can use if the above two versions don’t work).

Lab 4 FAQ

• Your spindle should by cylindrical and should fit inside the hub assembly
  • Make sure your part will assemble (i.e., won’t interfere) and will have \”running fits\” with the bearings.
• Make sure your part can be machined and would survive cyclic loading (i.e., no sharp inside corners).
• the spindle nut has internal threads that are M28–1.5 and will be located at the top of the assembly shown on p. 2 of the assignment.
• When you specify your \”fits\”, you can do this by specifying the fit (e.g., h6) after the nominal dimension and include a special tolerance box on your drawing that specifies these tolerances OR you can display the proper tolerance numerically after the dimension.

Reference information for ProE (revisit of info from Lab 2)

• To display 1, 2 or 3 decimal places following a dimension
  • right click on the drawing background and select \”properties\”
  • click \”Drawing Options\” in the menu window on the right side of the screen.
  • in the \”Drawing Options\” window, scroll down to the section titled \”These options control dimensions\”
  • scroll down a bit further to \”lead_trail_zeros\”
    • Select \”both-english\” from the pull-down bar (currently set at \”none\” I believe). This is why ProE displays 68 for a dimension on your part.
• To display tolerances after your dimension
  • right click on the drawing background and select \”properties\”
  • click \”Drawing Options\” in the menu window on the right side of the screen.
  • in the \”Drawing Options\” window, scroll down to the section titled \”These options control dimensions\”
  • scroll down a bit further to \”tol_display\”
  • select \”yes\” or \”on\”
• To specify tolerances after your dimension
  • Select the dimension (it will highlight in red).
  • right click the dimension, and click properties
  • you’ll see an entry cell for your tolerances (and a pull down menu above that which allows you to chose various tolerance display schemes).

CAD Tutorial 3 - Sweeps and Blends

Pro E Users

Note there are 2 parts to this tutorial.

• Complete the Parallel Blend tutial found at the following web address Blends Tutorial. Note that this is a ProE WF2 tutorial, so it is possible that there may be bugs you may encounter in doing the tutorial. Nick will post any bugs or issues that exist with the tutorial in the next day or so.
  • Print out and hand in 2 isometric views of the constructed part. One view of the original ‘smoothed’ part and the another view of the twisted part.
  • You only need to complete the Parallel Blend portion on this tutorial. You do not need to do the Rotational Blend or the General Blend parts of the tutorial.
• Complete pages 1–2 of the Sweep tutial found here Advanced Modeling.
  • Print out and hand in an isometric view of the remote.
  • You only need to complete half of the second page, until you have completed the sweep.
  • TIP - If you can’t create the sweep with the cross section shown in the tutorial, just choose your own cross section (without arcs).

For SolidWorks Users

Note there are 2 parts to this tutorial.

• Complete the Lofts tutorial from the help→online tutorials menu.
  • Print out and hand in an isometric view of the wedge shape you create.
• Finish the sweep section of the Revolves and Sweeps tutorial from the help→online tutorials menu.
  • Print out and hand in an isometric view of the vase.
  • You already completed the revolves portion of this tutorial 2 weeks ago, so hopefully you saved it and you can just continue.

Lab 4 — time to complete

ProE users

Time it took you to complete Lab 4

1 hour 2 hours 3 hours 4 hours 6–8 hours 8 or more hours

Time it took you to complete Lab 4 Tutorial

~30 min. 1 hour 1.5 hours 2 hours 3 hours 4 or more hours

SolidWorks users

Time it took you to complete Lab 4

1 hour 2 hours 3 hours 4 hours 6–8 hours 8 or more hours

Time it took you to complete Lab 4 Tutorial

~30 min. 1 hour 1.5 hours 2 hours 3 hours 4 or more hours

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