Общий каталог Widia 2017 - страница 677

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Screw Thread Defi nitions

resultant angle 3.5º 2.5º 1.5º 0.5º -0.5º -1.5º

insert size (iC) toolholder shim ordering code

ex. RH/in. LHSM-YE3-2PSM-YE3-1PSM-YE3SM-YE3-1NSM-YE3-2NSM-YE3-3N
16mm
ex. LH/in. RHSM-YI3-2PSM-YI3-1PSM-YI3SM-YI3-1NSM-YI3-2NSM-YI3-3N
ex. RH/in. LHSM-YE4-2PSM-YE4-1PSM-YE4SM-YE4-1NSM-YE4-2NSM-YE4-3N
22mm
ex. 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 sizeshim size (D)ordering codecontains slanted shims
SM-YE3-2P, 1P, 1N, 2N, 3N
3x16mmABY3
SM-YI3-2P, 1P, 1N, 2N, 3N
SM-YE4-2P, 1P, 1N, 2N, 3N
4x22mmABY4

SM-YI4-2P, 1P, 1N, 2N, 3N

The Helix Angle

Example:q = Helix angle( p * starts )
q = arctan= 1.13°
d = 48,06mm (1.892")p = pitch/›’

p = 3,175mm ( .125") d = pitch diameter

Screw Thread Defi nitions

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 profi les 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 diameter lead angle 3. Thread angle (included) — The included angle between the individual fl anks 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 fl anks. 9. Root — The inner most surface of the thread form which NOTE: Threads per inch (TPI) not shown: joins the fl anks. The number of threads per inch measured axially. The terms pitch and TPI are often used interchangeably. TPI = 1/pitch