Machinery's Handbook, 31st Edition
Reamers 915 Radial Relief: Relief in a radial direction measured in the plane of rotation. It can be measured by the amount of indicator drop at a given radius in a given amount of angular rotation. Primary Relief: The relief immediately behind the cutting edge or margin. Properly called relief. Secondary Relief: An additional relief behind the primary relief. Relief Angle: The angle, measured in a transverse plane, between the relieved surface and a plane tangent to the periphery at the cutting edge. Secondary Chamfer: A slight relieved chamfer adjacent to and following the initial chamfer on a reamer. Shank: The portion of the reamer by which it is held and driven. Squared Shank: A cylindrical shank having a driving square on the back end. Starting Radius: A relieved radius at the entering end of a reamer in place of a chamfer. Starting Taper: A slight relieved taper on the front end of a reamer. Straight Shank: A cylindrical shank. Tang: The flatted end of a taper shank which fits a slot in the socket. Taper per Foot: The difference in diameter between two points 12 in. apart measured along the axis. Taper Shank: A shank made to fit a specific (conical) taper socket. Direction of Rotation and Helix.— The terms “right hand” and “left hand” are used to describe both direction of rotation and direction of flute helix or reamers. Hand of Rotation (or Hand of Cut): Right-hand Rotation (or Right-hand Cut): When viewed from the cutting end, the reamer must revolve counterclockwise to cut Left-hand Rotation (or Left-hand Cut): When viewed from the cutting end, the reamer must revolve clockwise to cut Hand of Flute Helix: Right-hand Helix: When the flutes twist away from the observer in a clockwise direction when viewed from either end of the reamer. Left-hand Helix: When the flutes twist away from the observer in a counterclockwise direction when viewed from either end of the reamer. The standard reamers on the tables that follow are all right-hand rotation. Dimensions of Centers for Reamers and Arbors Arbor Dia. A Large Center Dia. B Drill No. C Hole Depth D Arbor Dia. A Large Center Dia. B Drill No. C Hole Depth D 3 ⁄ 4 3 ⁄ 8 25 7 ⁄ 16 2 1 ⁄ 2 11 ⁄ 16 J 27 ⁄ 32 13 ⁄ 16 13 ⁄ 32 20 1 ⁄ 2 2 5 ⁄ 8 45 ⁄ 64 K 7 ⁄ 8 7 ⁄ 8 7 ⁄ 16 17 17 ⁄ 32 2 3 ⁄ 4 23 ⁄ 32 L 29 ⁄ 32 15 ⁄ 16 15 ⁄ 32 12 9 ⁄ 16 2 7 ⁄ 8 47 ⁄ 64 M 29 ⁄ 32 1 1 ⁄ 2 8 19 ⁄ 32 3 3 ⁄ 4 N 15 ⁄ 16 1 1 ⁄ 8 33 ⁄ 64 5 5 ⁄ 8 3 1 ⁄ 8 49 ⁄ 64 N 31 ⁄ 32 Arbor. Dia. A Large Center Dia. B Drill No. C Hole Depth D 1 1 ⁄ 4 17 ⁄ 32 3 21 ⁄ 32 3 1 ⁄ 4 25 ⁄ 32 O 31 ⁄ 32 1 3 ⁄ 8 35 ⁄ 64 2 21 ⁄ 32 3 3 ⁄ 8 51 ⁄ 64 O 1 1 1 ⁄ 2 9 ⁄ 16 1 11 ⁄ 16 3 1 ⁄ 2 13 ⁄ 16 P 1 1 ⁄ 4 1 ⁄ 8 55 5 ⁄ 32 … … Letter … 3 5 ⁄ 8 53 ⁄ 64 Q 1 1 ⁄ 16 5 ⁄ 16 5 ⁄ 32 52 3 ⁄ 16 1 5 ⁄ 8 37 ⁄ 64 A 23 ⁄ 32 3 3 ⁄ 4 27 ⁄ 32 R 1 1 ⁄ 16 3 ⁄ 8 3 ⁄ 16 48 7 ⁄ 32 1 3 ⁄ 4 19 ⁄ 32 B 23 ⁄ 32 3 7 ⁄ 8 55 ⁄ 64 R 1 1 ⁄ 16 7 ⁄ 16 7 ⁄ 32 43 1 ⁄ 4 1 7 ⁄ 8 39 ⁄ 64 C 3 ⁄ 4 4 7 ⁄ 8 S 1 1 ⁄ 8 1 ⁄ 2 1 ⁄ 4 39 5 ⁄ 16 2 5 ⁄ 8 E 3 ⁄ 4 4 1 ⁄ 4 29 ⁄ 32 T 1 1 ⁄ 8 9 ⁄ 16 9 ⁄ 32 33 11 ⁄ 32 2 1 ⁄ 8 41 ⁄ 64 F 25 ⁄ 32 4 1 ⁄ 2 15 ⁄ 16 V 1 3 ⁄ 16 5 ⁄ 8 5 ⁄ 16 30 3 ⁄ 8 2 1 ⁄ 4 21 ⁄ 32 G 13 ⁄ 16 4 3 ⁄ 4 31 ⁄ 32 W 1 1 ⁄ 4 11 ⁄ 16 11 ⁄ 32 29 13 ⁄ 32 2 3 ⁄ 8 43 ⁄ 64 H 27 ⁄ 32 5 1 X 1 1 ⁄ 4 60 B D A C
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