Общий каталог Widia 2017 - страница 677

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Technical Information Screw Thread Definitions resultant angle 3.5º 2.5º 1.5º 0.5º -0.5º -1.5º insert size (iC) toolholder shim ordering code 16mm ex. RH/in. LH SM-YE3-2P SM-YE3-1P SM-YE3 SM-YE3-1N SM-YE3-2N SM-YE3-3Nex. LH/in. RHSM-YI3-2PSM-YI3-1PSM-YI3SM-YI3-1NSM-YI3-2NSM-YI3-3N 22mm ex. RH/in. LH SM-YE4-2P SM-YE4-1P SM-YE4 SM-YE4-1N SM-YE4-2N SM-YE4-3Nex. LH/in. RHSM-YI4-2PSM-YI4-1PSM-YI4SM-YI4-1NSM-YI4-2NSM-YI4-3N Slanted Shim Kit Because you might occasionally need different shims than those supplied with our standard toolholders, we strongly recommend that shim kits be readily available in every tool shop. insert size shim size (D) ordering code contains slanted shims 3x 16mm ABY3 SM-YE3-2P, 1P, 1N, 2N, 3NSM-YI3-2P, 1P, 1N, 2N, 3N 4x 22mm ABY4 SM-YE4-2P, 1P, 1N, 2N, 3NSM-YI4-2P, 1P, 1N, 2N, 3N The Helix Angle Example: q = Helix angled=48,06mm (1.892")p=pitchp=3,175mm ( .125")d=pitch diameterq = arctan( p * starts ) = 1.13°/›’ Screw Thread Definitions 1. Major diameter — The largest diameter of a straight screw thread. This applies to both internal and external threads. nut 2. Pitch diameter — On a straight thread, it is the diameter which passes through the thread profiles at such points which make the thread width of the groove equal to one-half of the basic pitch. On a “perfect thread,” this occurs at the point where the major diameter widths of the thread and groove are equal. pitch diameter3. Thread angle (included) — The included angle betweenlead angle the individual flanks of the thread form. minor diameter 4. Minor diameter — The smallest diameter of a straight screw thread. This applies to both internal and external threads. lead 5. Lead angle — On a straight thread, the lead angle is the angle thread angle created by the helix of the thread at the pitch diameter with included pitch a plane perpendicular to the axis. 6. Lead — The distance a screw thread advances axially in one revolution. On a single start, the pitch and lead are identical. crest The lead is equal to the pitch times the number of starts. root 7. Pitch — The distance from a point on a screw thread to a corresponding point on the next thread measured parallel screw to the thread axis. 8. Crest — The outer most surface of the thread form which joins the flanks. 9. Root — The inner most surface of the thread form which NOTE: Threads per inch (TPI) not shown: joins the flanks. The number of threads per inch measured axially. The terms pitch and TPI are often used interchangeably. TPI = 1/pitch widia.com F79