Help with drawing a part

[TomG]

Darren,

Standard tolerances can be found in the Machinery's Handbook or similar references. They simply determine whether two parts will slip together or press together and by how much. For instance in the ANSI standard, there are the following fits:

• RC Running or Sliding Fits
  
• LC Locational Fits
  
• LT Transitional Clearance or Interference Fits
  
• LN Locational Interference Fits
  
• FN Force or Shrink Fits
  

Each fit has a class associated with it to determine the allowance which is applied to the hole and the shaft. I believe it's done a bit differently in the metric world, but the outcome is the same.

I see the 3.5mm dimension now. As far as the views go, for the right hand view to be correct, the left hand view should be rotated 90º CCW.

Tom