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part 4
Step 1
open a sketch on the front plane and draw a centerline
Step 2
draw shown sketch
Step 3
add this lines
Step 4
use revolve command
Step 5
use fillet command and enter the fillet value
Step 6
select this edges and confirm that. save part 4
Step 7
part 4 and part 3 will be join like this. we will done all of parts before and then we will generate a assembly file. many after :)
next: http://grabcad.com/questions/tutorial-how-to-model-a-propelling-pencil-10