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HOW TO CREATE ENDMILL
Step 1
create circle 50mm dia on the front plane.
Step 2
extruded boss/base 250mm.
create sketch on this face.Step 3
something like this
Step 4
exit sketch.
create new sketch on the same face.Step 5
create circle 50mm,
create helix:
pitch 300mm
rev. 0,5
start angle 0
clockwise
...exit sketch.Step 6
cut-sweep using sketch and helix
Step 7
create sketch on this face:
Step 8
Right click on edge - select loop - convert entities.
exit.Step 9
new sketch on same face:
create circle 50mmStep 10
and then create TAPER helix.
Step 11
cut-sweep
Step 12
create Axis
Step 13
circular pattern
Step 14
...just sharpen it... :)