Changes between Version 15 and Version 16 of CADTraining

Timestamp:

Aug 20, 2020, 4:25:18 PM (5 years ago)

Author:

Angela Voo

Comment:

--

CADTraining

@@ -86 +86 @@
 
 To finish your project, you may print it out on the school's 3D printer or mill it in the CNC. And finally, make a fully dimensioned drawing of your object.
+
+== '''CAD Drawing Guidelines''' ==
+PLTW General Guidelines for Dimensioning:
+1. Dimensions should NOT be duplicated, or the same information be given in two different ways.
+2. No unnecessary dimensions should be used - only those needed to produce or inspect the part.
+3. Dimensions should be placed at finished surfaces or important center lines.
+4. Dimensions should be placed so that it is not necessary for the observer to calculate, scale, or assume any measurement.
+5. Dimensions should be attached to the view that best shows the shape of the feature to be dimensioned.
+6. Avoid dimensioning to hidden lines wherever possible.
+7. Dimensions should not be placed on the object unless that is the only clear option.
+8. Overall dimensions should be placed the greatest distance away from the object so that the intermediate dimension can nest closer to the object to avoid crossing extension lines.
+9. A dimension should be attached to only one view (i.e., extension lines should not connect two views).
+10. Never cross dimension lines.
+11. Never cross extension lines.
+12. A center line may be extended and used as an extension line.
+13. Leaders should slope at a 30, 45 or 60 degree angle.
+14. Dimension numbers should be centered between arrowheads, except when using stacked dimensions then the numbers should be staggered.
+15. In general, a circle is dimensioned by its diameter, an arc by its radius.
+16. Holes should be located by their center lines.
+17. Holes should be located in the view that shows the feature as a circle.
+18. Extension lines start approximately 1/16" from the object and extend 1/8" past the last dimension.
+19. The first dimension is approximately. 1⁄2" from the object and spaced uniformly approximately. 3/8" apart.
+10. Always dimension the actual size of the object - not the scaled size.
+
+Space RAIDers Guidelines:
+1. Add the name and material type of the mechanism in the respective boxes
+2. Always have another member check your drawing before using it
+3. Fill out the approval box with another member
+4. If used directly on materials in fabrication, create 1:1 ratio drawings
+