Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
The internal surface of a drilled hole can be viewed from a single operator position by rotatably supporting a centering microscope on an arm that is, in turn, rotatable about the hole axis. Referring to the figure, shaft 1, suitably mounted for movement over the surface of workpiece 2, rotatably supports an arm 3 on which is fixed vertical slide 4 adjustable via knob 5. Depending from the slide is bracket 6 having pivot 7 about which sleeve 8 can be rotated by adjusting knob 9. A centering microscope 10 is mounted for rotation on bearings within the sleeve. Sleeve 8 is oriented to intersect the longitudinal axis of shaft 1 and hole 12 in workpiece 2. Since the microscope rotates relative to sleeve 8, arm 3 can be rotated about shaft 1 while the microscope eyepiece 13 remains at the same azimuth but changes in elevation.