open on the shown surface and use convert entities command. then exit from the sketch
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
exit from the sketch. go to insert--curve--helix then select the blue surface
draw shown circle
exit from the sketch and enter shown values
confirm that and use sweep command. firstly select the sketch
select the helis and confirm that
now open a sketch on the front plane and draw a rectangle like shown. the dimensions are not important.
use cut extrude command at two direction.
confirm that and part 2 is ready
save part 2