Need help with boss to sloping edge

[salesMUBBN]

Hi,

I am having trouble figuring out how to get a boss in the lid of attached image to match onto sloped surface.

I want to have a counter bore hole so a bolt can be insert at top of box(with head recessed around 2.5mm) and hread to come out through bottom to attach to the enclosure base.

I used the base of lid as reference but when I extrude to far, the boss come out through top and if not far enough I get a gap like below. I am not sure if there is a command to get it to meld with the slope or I should somehow start the hole on the slope from top and use standard counter bore hole?

[davebYYPCU]

No timeline in the pic to see how you got that far, 

Extrude to Object will do it....

Hole from top face, 

Pattern and Mirror.

Might help....

[salesMUBBN]

Thanks Dave,

How did you get the extrusion to join with the slope? If I extrude to point where entire bose meets the slope part of the extrusion starts popping our the top. As a stop-gap measure I extruded so it stuck out quite a bit out top and then trimmmed by deleting faces but I'm sure there is a contril that you can set to "extrude to slope" or something?

[davebYYPCU · Accepted solution]

Sorry I thought I added the example file.

Extrude the circle, tell it to finish on object, and select the inside face.

same as the picture.

Might help....