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4 . T r a n s m i s s i o n s y s t e m s
4.2.2 According to the kind of thread changing transmission unit can be realised by operating handle 6 (see manual part 7
fig. 7-1). Besides it can be used for changing feed rate.
28
U
Metric threads
：
p
27
30
Inch threads
41
4.2.3 Feed box basic speed changing unit (U
The shaft Ⅰ,Ⅱ, and Ⅲ in gear box are consists of a basic speed changing unit, which is realised by operating handle 7
(see manual part 7 fig. 7-1).
： For metric and module threads total 7 units.They are
U
b
28
18
2
＝
（handle position 1）
×
36
21
3
28
33
11
＝
（handle position 7）
×
36
18
12
21
21
7
＝
（handle position 11）
×
18
21
6
For inch and pitch threads total 10 units.They are
21
36
3
＝
（handle position 15）
×
18
28
2
21
32
6
＝
（handle position 12）
×
20
28
5
28
32
＝1 （handle position 8）
×
32
28
28
18
3
＝
（handle position 2）
×
32
21
4
When calculating feed rate, it should be added below unit. They are total 15 units.
28
21
7
＝
（handle position 3）
×
32
21
9
4.2.4 They are total 4 speed double increasing unit (U
fig. 7-1)
14
15
1
＝
（handle positionⅠor A）
×
42
40
8
14
33
1
＝
（handle postion Ⅲ or C） connecting of internal and external tooth
×
42
22
2
4.2.5 leadscrew thread pitch:
Metric：T=12mm
Inch：T= 12.7mm (1/2 In)
4.3 Thread turning
4.3.1 Metric threads
27
×
module threads
30
27
×
30
)
b
28
18
×
32
21
28
32
×
32
28
21
32
×
18
28
28
36
×
32
28
28
32
×
36
28
14
42
28
41
×
27
29
30
41
pitch threads
×
41
29
3
＝
（handle position 2）
4
＝1（handle position 8）
4
＝
（handle position 14）
3
9
＝
（handle position 10）
8
8
＝
（handle position 6）
9
), which can be realised by operating handle 8(see manual part 7
d
24
1
＝
（handle positionⅡor B）
×
32
4
28
20
5
＝
（handle position 4）
×
32
21
6
28
36
9
＝
（handle position 10）
×
32
28
8
21
36
9
＝
（handle position13）
×
21
28
7
28
36
12
＝
（handle position 9）
×
33
28
11
21
18
6
＝
（handle position 5）
×
21
21
7
22
＝1（handle position Ⅳ or D）
22
4 -
3
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