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Tables and overviews | Thread
10
678
HEIDENHAIN | MANUALplus 620 | User's Manual | 12/2017
10.1 Thread
Thread parameters
To determine the thread parameters, the control uses the following
table.
Where:
F : Thread pitch is calculated from the diameter, depending on
the thread type, where an asterisk
*
is given
Further information: "Thread", Page 678
P : Thread depth
R : Thread width
A
:
Thread angle, left
W : Thread angle, right
Calculation formula: Kb = 0.26384 * F – 0.1 * # F
Thread backlash
ac
(depending on the
Thread pitch
):
Thread pitch <= 1 : ac = 0.15
Thread pitch
<= 2 :
ac
= 0.25
Thread pitch <= 6 : ac = 0.5
Thread pitch <= 13 : ac = 1
Sort of thread Q F P R A W
Q = 1 Metric ISO fine-pitch thread External – 0.61343 * F F 30° 30°
Internal – 0.54127 * F F 30° 30°
Q
= 2 Metric ISO thread
External *
0.61343 *
F F 30° 30°
Internal * 0.54127 * F F 30° 30°
Q = 3 Metric ISO tapered thread External – 0.61343 * F F 30° 30°
Q = 4 Metric ISO tapered fine-pitch thread – 0.61343 * F F 30° 30°
Q = 5 Metric ISO trapezoid thread External – 0.5 * F + ac 0.633 * F 15° 15°
Internal –
0.5 *
F
+
ac
0.633 *
F 15° 15°
Q = 6 Flat metric trapezoid thread External – 0.3 * F + ac 0.527 * F 15° 15°
Internal – 0.3 * F + ac 0.527 * F 15° 15°
Q = 7 Metric buttress thread External – 0.86777 * F 0.73616 * F 3° 30°
Internal – 0.75 * F F – Kb 30° 3°
Q
= 8 Cylindrical round thread
External *
0.5 *
F F 15° 15°
Internal * 0.5 * F F 15° 15°
Q = 9 Cylindrical Whitworth thread External * 0.64033 * F F 27.5° 27.5°
Internal * 0.64033 * F F 27.5° 27.5°
Q = 10 Tapered Whitworth thread External * 0.640327 * F F 27.5° 27.5°
Q
= 11 Whitworth pipe thread
External *
0.640327 *
F F 27.5° 27.5°
Internal * 0.640327 * F F 27.5° 27.5°
Q = 12 Nonstandard thread – – – – –
Q
= 13 UNC US coarse thread External * 0.61343 *
F F
30° 30°
Internal * 0.54127 * F F 30° 30°