I am unable to subtract a 3d block. My objective is a series of holes in a conical surface (a 100 hole spray nozzle). I am trying to use a block where I can change orientation of all holes at once (because we are still experimenting in the lab with various hole angles).
It would be nice to use the insert hole method but I am working on a conical surface and it appears the insert hole only works on planes (any advice?). So I am resorting to making the holes as subtracted 3-d circles from the solid cone. that approach is doable but then I apparently can't subtract the 3-d circles as a group - resulting in selecting each 3-d circle individually which is a serious pain with the 100 holes. Plus changing the angle requires editing individual holes.
Am I missing something? I will appreciate suggestions. Thanks.
Here's a possible approach, a modification of your technique of subtracting 3D circles...
Instead of a 3D circle, create the subtracting object as shown in the attached screenshot. Format the two lines, the circle, the Point, and the Rail Sweep (all of them!) as a Block. Make copies of the Block as needed to put them where the holes should be. (You might not need the vertical line ; I used it to define the center when making a Radial Copy.)
To make the holes: Press Ctrl+T (Select by Type) and select "Block Insertion" from the list; go to Format|Explode. This un-Blocks the Blocks in the drawing area, whereupon you can subtract the Rail Sweeps from your cone. Do NOT close the file at this point.
To change the hole orientation and/or hole profile: Undo the subtract operation; Undo the explode operation; modify the Block as required; repeat the explode and subtract operations.