Step 1:
Go to menu Solids>Primitives
Select CUBE then click Ok.
Select MIDDLE
Enter X 0, Y 0, Z -2 in the top menu
Enter X 21,Y 21, Z 4 in the bottom menu
Click the USC Icon in the upper right corner and select Default for the view
Press the Z key to zoom to the part extents
Now you should see the wire frame of the base block (don't worry about the thickness as it does not really matter for machining the part top.)
I will be back in a while for the solids>shpere.
I have to work and only doing this during breaks. |