A machining apparatus for machining the interior of a member mounted with respect to ground, the apparatus comprising: a spindle system positionable within a cylindrical bore of the member; the spindle system including a housing and a rotatable spindle disposed in the housing, and a machining item connected to and rotated by the rotatable spindle; and a motor system adjacent the spindle system, the motor system positionable within the confines of said cylindrical bore of the member with the spindle system, the motor system for driving the rotatable spindle within the member to rotate the rotatable spindle and the machining item; wherein said machining apparatus further comprises: a pipe system having a longitudinal axis and being connected at one end to one of the motor system and spindle system characterized in that the pipe system extends out of the member and is connected at its other end to a base, wherein the base is mounted to ground such that the base and member are movable with respect to one another along an axis through the member and pipe system and wherein the pipe system comprises: first and second pipe members (94,95), both being rotationally fixedly connected to said one of the motor system and spindle system, and the first being connected to said base; a rotation system, connected to the second pipe member to twist the second pipe member with respect to the base; an inclinometer, connected to said motor system and spindle system to detect the rotational position of the item with respect to said longitudinal axis; and a control to actuate the rotation system upon detection of a change of said rotational position so as to maintain said position. a spindle system positionable within a cylindrical bore of the member; the spindle system including a housing and a rotatable spindle disposed in the housing, and a machining item connected to and rotated by the rotatable spindle; and a motor system adjacent the spindle system, the motor system positionable within the confines of said cylindrical bore of the member with the spindle system, the motor system for driving the rotatable spindle within the member to rotate the rotatable spindle and the machining item; wherein said machining apparatus further comprises: a pipe system having a longitudinal axis and being connected at one end to one of the motor system and spindle system characterized in that the pipe system extends out of the member and is connected at its other end to a base, wherein the base is mounted to ground such that the base and member are movable with respect to one another along an axis through the member and pipe system and wherein the pipe system comprises: first and second pipe members (94,95), both being rotationally fixedly connected to said one of the motor system and spindle system, and the first being connected to said base; a rotation system, connected to the second pipe member to twist the second pipe member with respect to the base; an inclinometer, connected to said motor system and spindle system to detect the rotational position of the item with respect to said longitudinal axis; and a control to actuate the rotation system upon detection of a change of said rotational position so as to maintain said position. a pipe system having a longitudinal axis and being connected at one end to one of the motor system and spindle system characterized in that the pipe system extends out of the member and is connected at its other end to a base, wherein the base is mounted to ground such that the base and member are movable with respect to one another along an axis through the member and pipe system and wherein the pipe system comprises: first and second pipe members (94,95), both being rotationally fixedly connected to said one of the motor system and spindle system, and the first being connected to said base; a rotation system, connected to the second pipe member to twist the second pipe member with respect to the base; an inclinometer, connected to said motor system and spindle system to detect the rotational position of the item with respect to said longitudinal axis; and a control to actuate the rotation system upon detection of a change of said rotational position so as to maintain said position. first and second pipe members (94,95), both being rotationally fixedly connected to said one of the motor system and spindle system, and the first being connected to said base; a rotation system, connected to the second pipe member to twist the second pipe member with respect to the base; an inclinometer, connected to said motor system and spindle system to detect the rotational position of the item with respect to said longitudinal axis; and a control to actuate the rotation system upon detection of a change of said rotational position so as to maintain said position.