Hi, I am making an engine block and when using Boolean for the cylinder sleeves some cylinders work fine and others that are near identical delete needed vertices leaving the main journal bulkheads exposed and I have no idea why or how to fix that.
Here is a picture since BA will not let me upload the Blender file or dropbox link. I booleaned (Difference) the block for the Sleeves Labled Sleeve 4.7 x and you can see that cylinder number 8 (furthest back) was fine, Cylinder 6 (next to it) I slowly fixed by hand, and Cylinder 4 (Next to that one) is how Blender goofs up the Boolean. There is no floor to the main bulkhead and you can see inside the bulkhead which is not correct. I can continue to fix these by hand but it takes a while and is not 100 percent accurate and II still need to understand the problem. The normals should be all good and I merged all vertices.
Also is there a way to make sure a face is rotated parallel to the ground/Surface? I eyeballed it when fixing these by hand.
Thanks for any and all help.