Pork Chop Express
I never drive faster than I can see...
Machines are not conscious. Scientists can only work within the boundaries of the applicable knowledge that's already available to them. And consciousness happens to be a great, scientific mystery. So, how can they create a machine with self-awareness, if they don't even know the cause (or, let alone, the nature) of consciousness, to begin with?
No, machines are not conscious, yet. As technology advances (robotics, nanotechnology, biotechnics) that may change but not within my lifetime I don't think. Ultimately these will be tools for humanity at large for whatever application. Take the ideology and morality (flipside to this coin) out of it and it's inevitable in my opinion. No, scientist don't know what consciousness is exactly, but that doesn't mean that it cannot or will not be created at some point. You'd be surprised by how much life imitates art.