Extrude to a sphere?

[Scott Lent]

I’ve been using Mastercam for about 9 months now and I’m relatively new to solid modeling. I’ve had good success creating most models I’ve needed to, but the geometry in the example I’ve attached has me stumped. This is also my first post to the forum, so hopefully, I've done it correctly.

I’m attempting to draw a butterfly disk, the extents of which are contained within a 4.0” sphere. To clarify this, I’ve created a sphere on level 3 for illustration purposes only. To create the model, I drew the geometry of the disk portion and created the solid body by revolving that geometry. I then drew the geometry of the boss and cross hole, of which the centers of both pass through the center of the sphere at 15 degrees. When I extrude the boss, I can’t figure out how to extend it to terminate at (and become part of) the 4.0” sphere, nor can I figure out how to trim it back to the sphere if I intentionally make the boss long, as I did in the example. Any help would be most appreciated. EXAMPLE.MCX-7

[ajmer]

use solids--> trim to surface

select the sphere surface

if you get the error this will destroy solid

escape out

do it again and use the flip sides button 

[Scott Lent]

That is the process that I've been trying to use, but when I attempt to select the sphere surface, it won't select, neither will anything else for that matter.....

[Scott Lent]

Oops! I see what I was doing wrong. I used the sphere I'd put on level 3 to trim to and it worked. Thanks for pointing me in the right direction!