Jet GH-26120ZH Operation And Maintenance Instructions Download

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I/II/III/IV

= The leadscrew is used to cut

thread forms.

A/B/C/D

= The feed rodis used to control

the feed/revolution.

The ratios between them are:

I: II: III: IV:

= A:B:C:D = 1:2:4:8

Figure 24 – Carriage controls and settings

Carriage Lock

(J, Figure 24): Located on top

right of carriage. Turn clockwise to lock,
counterclockwise to unlock.

Carriage lock must be

loose before moving carriage or damage to
lathe may occur.

Carriage Handwheel

(K, Figure 24): Located

on the apron. Rotate handwheel clockwise to
move carriage assembly toward tailstock
(right). Rotate the wheel counterclockwise to
move carriage assembly toward headstock
(left). A scale is mounted to the ring, graduated
in 0.05 inch increments, and can be calibrated
by loosening the thumb screw lock and
rotating the ring as needed. Always re-tighten
ring before using the feed.

Half Nut Lever

(L, Figure 24): Located on

front of apron assembly. Engages the
leadscrew for threading operations.

Threading Dial

(Figure 25):Indicates the point

on the leadscrew where the half nut can be re-
engaged to continue inch threading.

Figure 25

Spindle Direction Control Lever

(M, Figure

24). Move lever to the right so that its tab
clears the notch, then down for forward spindle
rotation, or up for reverse spindle rotation.

Allow spindle to come to a stop before
changing directions.

Position lever in neutral position (tab in notch)
before shutting off the lathe.

10.

Feed Direction Lever

(N, Figure 24): Left and

right moves the carriage in the corresponding
directions (longitudinal feed); up and down
moves the cross slide (cross feed).

11.

Rapid Traverse Button

(O, Figure 24). Push

for rapid movement in the direction set by the
feed direction lever. Rapid longitudinal
movement disengages the carriage
handwheel.

However, the cross slide

handwheel should be disengaged (pull it
out) before using rapid feed.

IMPORTANT:

The rapid traverse button

is not

used for actual feeding of the tool, only for
initial positioning. Also, be aware that
engaging the rapid traverse will override
automatic feed.

12.

Cross Slide Handwheel

(P, Figure 24):

Located above apron assembly. Clockwise
rotation moves cross slide toward rear of
machine. The accompanying scale is
graduated in 0.002 inch increments. Before
using rapid feed, disengage this handle by
pulling it outward.

13.

Compound Rest

(Q, Figure 24): Located on

top of the cross slide and can be rotated 360°
by loosening four nuts (two in front, two in
back). There are calibrations in degrees (Q1,
Figure 24) to assist in placement of the
compound rest to the desired angle.

14.

Compound Rest Handle

(R, Figure 24):

Rotate clockwise or counterclockwise to
position. The accompanying scale on the collar
is graduated in 0.001 inch increments.

15.

Tool Post Clamping Lever

(S, Figure 24):

Rotate counterclockwise to loosen and
clockwise to tighten. Always use minimum of
two clamping screws to secure a cutting tool.