Combined Drill and Countersinks Plain Style Individual Sizes 0 1 2 3 4 5 6 7 8 9 10 High Speed Steel ID 775-

Part Number: 775-
Combined Drill and Countersinks Plain Style Individual Sizes 0 1 2 3 4 5 6 7 8 9 10 High Speed Steel ID 775-
Combined Drill and Countersinks Plain Style Individual Sizes 0 1 2 3 4 5 6 7 8 9 10 High Speed Steel ID 775-
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Combined, Drill Countersink, Machine Reamer Hss HSCO
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Combined Drill and Countersinks Plain Style Individual Sizes 0 1 2 3 4 5 6 7 8 9 10 High Speed Steel ID 775-
Plain-Hey Type combined drill and countersinks are designed for use with inserts for producing
center holes in components as well as facing the surface of the work piece, thus combining two machining operations into one.

Combined Drill and Countersinks Plain Style Individual Sizes 0 1 2 3 4 5 6 7 8 9 10 High Speed Steel ID 775-

Combined Drills and Countersinks

    I. Definition

    Combined Drill and Countersink: Single or double-end cutting tool, having helical or straight flutes, and having a drill portion and an 
adjacent integral countersink portion, primarily used to produce center holes in work that will be held between machine centers

    II. General Classifications
    A. Classification Based on Construction
    1. Solid Combined Drills and Countersinks: Those made of one piece of material such as high speed steel
    2. Tipped Solid Combined Drills and Countersinks: Those having a body or drill portion of one material with cutting edges or lips, 
or both, made of another material brazed or otherwise bonded in place
    B. Classification Based on Type
    1. Plain Type Combined Drills and Countersinks: Those having a drill portion and a single adjacent integral countersink portion
    2. Bell Type Combined Drills and Countersinks: Those having a drill portion and an adjacent integral countersink portion, plus 
an additional secondary conical section to provide clearance for the bearing surface
    C. Classification Based on Hand of Cut
    same as twist drills

III. Nomenclature of Combined Drills and Countersinks

    Axis: The imaginary straight line which forms the longitudinal center line of the combined drill and countersink
    Back Taper: A slight decrease in diameter from the front to back in the drill length
    Bell Angle: The included angle of the secondary conical section providing clearance or protection for the countersink angle conical 
surface (normally 120 degrees)
    Bell Diameter: The diameter at the intersection of the countersink portion and the bell portion at the leading edge of the land
    Body: The central portion of the tool by which it is held or driven
    Countersink Angle: The included angle of the countersink portion (normally 60 degrees)
    Countersink Relief Angle: The angle between a plane at right angles to the axis of the tool, and a line tangent to the surface 
of the countersink portion at hte intersection of the countersink portion and the body and at the leading edge of the land; for the bell type,
 the relief angle is measured at the intersection of the bell portion and the body

Process Parameters:

    Depth of cut: The depth of the hole generated by the drilling process
    Feed: The rate that the drill advances into the material, generally measured in distance per flute
    Speed: The cutting speed is usually measured at the periphery of the drill in surface feet or meters per minute
    Thrust: The axial force required to drill
    Torque: The twisting moment required to drill
    Surface Finish: The roughness of the walls of the drilled hole; a measure of the hole quality

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