Autodesk Inventor

[#1]

Anyone know how I would make the attached image?

The plate should be .25" thick.

I've messed around with the helix - spiral function but it always makes a spiral that is already extruded as opposed to just giving me a spiral (like in a sketch) that I can then use another way..  <-- See image.

Thanks in adavece.

[#2]

extrude a circle, extrude cut the slice (pie shape) sketch on slice face, spiral cut using the coil command.

[#3]

I don't get the "spiral cut using the coil command" part..

[#4]

See attached image.

 

Attach your file here if you can't figure it out.