Abstract: A drilling device for drilling blind holes to a preselected depth in a work piece is provided. The drilling device includes a drill which rotatably drives a spindle which spindle drives a drill bit. Guide means for mounting the drill member for axial movement to perform the drilling operation are provided. A rod member is secured to and extends from the drill member and is moveable axially therewith as the drill performs its drilling function. An adjustable member is threadably mounted on the rod and is moveable relatively axially on the rod. Adjusting means including a wheel and detent are provided which are connected to the adjustable member and the rod member to rotate the adjustable member with respect to the rod member to thereby cause relative axial movement of the rod member and adjustable member which will change the relative position of the adjustable member on the rod member.

Abstract: Apparatus for determining the location of a physical feature, such as a hole in a panel, relative to two coordinate axes by optically scanning across the panel and hole from a reference while measuring the distance of the hole from the reference and the length of the hole chord for each of a plurality of scans, then adding half the chord length to the respective distance to the hole edge and averaging the results for the plurality of scans. Scan lines used for the hole edge and chord measurement can be selected from among a plurality of scan lines having a predetermined chord length. The measuring apparatus can also be readily adjusted to accommodate a range of feature dimensions.