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9.4 THREADS AND FEEDS
Gearbox, thread and feed selectors
All the thread pitches and feeds directly available from the
gearbox are shown on the data plate fitted on the front of
headstock and the positioning control levers are (G1), (G2),
(G3), and (G4).
End gear trains diagram
The end gear train should be arranged as in the
diagram shown on the dataplate (G5) to meet threading
requirements.
Feeds:
Sliding feeds per spindle revolution range from 0.0015 to
0.04 inch (0.04mm to 1.0mm).
Surfacing feeds per spindle revolution range from 0.00075
to 0.02 inch (0.02 to 0.5mm).
Threads & Feeds
Imperial threads:
Kinds / Range
Metric threads:
Diametral pitch (D.P.)
worm gear
Module pitch (M.P.)
worm gear
Longitudinal feeds
Cross feeds
Gearbox Selectors
(G1) A,B,C three section selector
(G2) R,S,T three section selector
(G3) 1–8 eight section selector
16
38 Kinds / 2–72 T.P.I.
40 Kinds / 0.4–14mm
21 Kinds / 8–44 D.P.
18 Kinds / 0.3–3.5 M.P.
0.04–1.0mm
(0.0015"–0.04")
0.02–0.5mm
(0.00075"–0.02")
(G4) W–Z five section selector
(G5) End gear train diagram
G5
G1
G2
G3
9.5 APRON CONTROLS
In addition to handwheel traverse the carriage can be pow-
er-operated through controls on the front of the apron.
(OL) Lever is moved down for power operation and up
for manual operation.
(A1) Push-pull knob selects power surfacing (cross feed)
when pulled out, sliding feeds are selected when the
knob is pushed in.
(A2) The adjacent push pull knob controls forward or
backward feed direction.
(A3) Lever is pressed downward to engage the lead-
screw nut for thread cutting. To avoid undue wear,
release the nut except when thread cutting. An inter-
lock within the apron prevents inadvertent engage-
ment of levers OL and A3 at the same time.
Note: Do not use headstock lever for reversing
feeds except during left-hand thread cutting; Use
instead, the apron handle (A2).
(A4) Carriage handwheel
(A5) Cross slide handwheel\
(A6) Compound rest handwheel
A5
(A7) Threading dial indicator
(A8) Spindle rotation, forward, stop and reverse: The
forward and reverse rotation of spindle is operated
by starting lever at right side of apron and controlled
by limit switches on the right-side the bedway.
A2
A1
A4
G4
Fig. 18
A6
A7
A3
OL
A8
Fig. 19
1800 Series Lathe
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