Tutorial how to model a propelling pencil (6)

part 2
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Step 1:
only click on the revolve command
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Step 2:
solid body is ready. now open a sketch on the right plane
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Step 3:
draw a triangle. the dimensions will be entered next step
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Step 4:
make your tooth profile like shown
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Step 5:
exit from the sketch. then insert--curve--helix spiral
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Step 6:
draw a shown circle on the shown surface
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Step 7:
exit from the sketch. enter the values
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Step 8:
use sweept command. select the sketch that we drew before, then select the helix
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Step 9:
use referance geometry--plane command. select the pink surface and enter the shown value
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Step 10:
confirm that and draw a circle
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Step 11:
exıt from the sketch. insert--curve--helix
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Step 12:
select the circle and enter shown volues. please enter the pitch value 2mm
next: http://grabcad.com/questions/tutorial-how-to-model-a-propelling-pencil-7