Tutorial how to model a propelling pencil (7)

Part 2
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Step 1:
open on the shown surface and use convert entities command. then exit from the sketch
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Step 2:
open a sketch on the front plane and draw a tooth profile again. please be attention that shown point must bu coincided with the circle
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Step 3:
exit from the sketch. go to insert--curve--helix then select the blue surface
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Step 4:
draw shown circle
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Step 5:
exit from the sketch and enter shown values
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Step 6:
confirm that and use sweep command. firstly select the sketch
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Step 7:
select the helis and confirm that
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Step 8:
now open a sketch on the front plane and draw a rectangle like shown. the dimensions are not important.
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Step 9:
use cut extrude command at two direction.
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Step 10:
confirm that and part 2 is ready
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Step 11:
save part 2
next: http://grabcad.com/questions/tutorial-how-to-model-a-propelling-pencil-8