Autodesk Inventor
Autodesk Inventor is a nice program for designing parts.
You can use it to make 3D models as well as 2D drawings.
Create a new part: open a .ipt file.
This file contains 3D information about the part that you can use to create a separate .dwg drawing file.
To switch from sketch to feature environment: ctrl-+
To adjust the dimension of a part: use the sketch environment.
If a part, say a disc, has been extruded, you need to click on the Sketch (e.g., Extrusion1/Sketch1) for the original disc in order to modify the diameter.
Drilling multiple holes symmetrically around an axis:
Right click on the sketch and select share sketch in the feature environment.
This will make things like circles accessible in the feature environment.
Specify the first hole by placing a circle on the sketch.
(The size of the circle does not matter.)
You may need to click on the Terminations icon (square with black and red arrows coming out of it) if you try to drill the wrong way through your part.
Then click on the circular symmetry tool.
First select the feature you want to replicate (the hole).
Then select the axis of symmetry by clicking on the original circle.
Select how many holes you want to appear and space them out over 360 degrees.
To make a 2D drawing from a 3D part: open a new .dwg file.
Click on base view and place the part on the sheet.
Center lines: Right-click on object and select automated center lines.
Then click on all the little icons.
More options under drawing annotation panel.
change the scale: move cursor over part until the part is highlighted in a dotted-line box. Right-click and select Edit view. Then select Scale.
drill a hole on the extruded side of a part: click on the face you want to drill on. Then click "Sketch" in the upper panel to start a new sketch for that face.
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