As of 2010, artificial gravity technology has not been invented.

The lack of gravity and exposure to artificial gravity severely weakens bones.

Rephrase this question

it is a 0 gravitatial spacecraft

That depends; what exactly do you expect such a "gravity machine" to do?

* Any mass will exert a force of gravity.

* Artificial gravity (an imitation of gravity) can be produced through quick spinning.

* Other types of "artificial gravity" appear in science fiction stories, but they don't appear in current technology, and it seems unlikely that they will be, any time soon.