tornos DECO 7/10 - Tests for Differential Threading on; Calculating Threading Ratio

OPTIONS & ALLIED TOOLING − DECO 7/10 − DECO 7a/10a − DECO 7e/10e
300236 en − 02/07 Chap. 13.5 /4
13.4 TESTS FOR DIFFERENTIAL THREADING ON S1/S3
Stock : Brass − MS−58 A
Diameter : 7 mm
Results : for machining approx. : 50 pcs in Tests No. 1, 3, 4, 5, 6
75 pcs in Test No. 2
Thread length measurement : with gauge
TECHNICAL DATA
RESULTS
N
o.
Thread
Speed [rpm]
ra
tio
ce
Test
No
∅
Lengt
h
[mm]
S1
S3
thread-
ing
S3
thread-
ing off
Die
head
Actual
speed
Threading
rat
Spring forc
e
[kg]
Disper-
sion
in length
[mm/pcs]
1
M4 30 9000 8000 10000 1000 8 2 0.44 / 50
2
M4 10 9000 8000 10000 1000 8 2 0.20 / 75
3
M2 10 9000 7500 10500 1500 5 1 0.13 / 50
4
M1 6 9000 7500 10500 1500 5 1 0.10 / 50
5
M1 6 9000 6000 12000 3000 2 1 0.08 / 50
6
M1 6 11500 11000 12000 5000 22 1 0.12 / 50
13.5 CALCULATING THREADING RATIO
Calculate a THREADING RATIO as follows :
− S1 speed / S3 speed for threading : 9000 / 8000 = 1.125
− Subtract 1 : 1.125 − 1 = 0.125
− 1 / x : 1 / 0.125 =
8
Note :
Ratio 8 means that 8 revolutions of the part per 1 revolution of the die
head are required.
An example for DWELL CALCULATION, see Instructions 300232 : PRO-
GRAMMING.