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4 .
Transmission systems
This device is set into the headstock. That throw handle 4 (FIG 7-1) is the way to enlarger pitch or feeds.
Sliding gear 28 in headstock: there are left and right positions. Transmitting way from spindle Ⅵ to Ⅷ:
ì
50
—
ï
50
ï
Spindle Ⅵ—
í
ï
64
ï
—
î
32
The ratio is 1 in the right while is 8 in the left. So the displacement is enlarged 8 times and it calls pitch-enlarging
transmission (to enlarge pitch or to increase feeds). When the spindle speed is 35～200r/min，pitch is enlarged 8 times.
4.1.4 Transmission unit for changing threads
There is a direction-changing device in the middle of shaft Ⅷ and ⅩⅧ used to turning left and right threads. When
gear 32 of shaft ⅩⅧin the right, motion transmits from shaft Ⅷ to shaft ⅩⅧ(26/26) directly to process dextrorotating
threads. While gear 32 in the left, motion transmits from shaft Ⅷ via ⅩⅦ to ⅩⅧ（
not changed but the direction of shaft ⅩⅧ to process left rotating threads.
4.1.5 Change gear can realise three transmission ratio(U
Metric：
Under normal condition:
Processing inch 19T threads：
1
Processing inch 11
threads:
2
Inch：
Under normal condition:
Processing inch 19T threads：
1
Processing inch 11
threads:
2
4.2 Feeds transmission system
4.2.1 Transmission route (fig.4-1）
Feed rate is indicated by the spindle/rotation, dia. of cutting tools.
motion —gear 23-25 on spindle—>VIII axel or motion —gear 21-20 on spindle—>V axel—gear 18-19，17-15—>III
axel or —gear 26-28—>VIII axel—gear 28-29—>XVIII axel.
Then motion will go to feed box via change gear box of XVIII axel. Different route will be generated according to
process requirement.
66
66
Ⅴ
—
—
Ⅳ
—
—
Ⅲ
33
33
60
69
×
69
56
60
69
×
69
57
60
56
×
56
69
82
114
×
114
81
82
78
×
78
114
82
114
×
114
78
ü
ï
ï
ý
—Ⅷ
ï
50
ï
—
þ
50
:
m)
26
33
）. The transmitting ratio is
´
33
26
4 - 2
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