Jet ZH Series, Operation And Maintenance Instructions

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Figure 28 – Insufficient jaw tooth engagement
•
Avoid long workpiece extensions, as parts may
bend or fly off (see figure 29). Use rests or the
tailstock for support.
Figure 29 – Improper setups
•
Avoid short clamping contact (Figure 30, A) or
clamping on a minor part diameter (Figure 30,
B). Face-locate the workpiece for added
support.
Figure 30 – Improper setups
12.1 Tool Setup
The cutting angle is correct when the cutting edge
is in line with the center axis of the workpiece. Use
the point of the tailstock center as a gauge and
shims under the tool to obtain the correct center
height.
Use a minimum of two clamping screws to secure
each tool.
12.2 Spindle Speed
Twelve speeds are available by placing the first
speed lever (E
1
, Figure 31) in one of four positions,
and placing second lever (E
2
) in a position that
matches the color for the range you desire. These
selections are identified on the lever hub, as well
as in Table 6,
section 16.3 .
You may need to turn the chuck by hand to assist
engagement of the gears.
Never change speed while spindle is turning.
Figure 31
12.3 Feed and Thread Selection
To obtain various feed settings and thread pitches,
the four levers (F,G
1
,G
2
,G
3
) are used conjunctively.
1. Refer to the Feed and Thread Chart on the
front of the headstock (H, Figure 31). The
chart is also shown in
section 16.10 of this
manual.
2. Any gear changes should be made in
accordance with the chart.
3. Move levers (G
1
,G
2
,G
3
, Figure 31) to the
appropriate position according to the Feed and
Thread Chart.
TIP: When selecting feed/speed correlations,
remember the general principal that high speeds
complement fine feeding, and low speeds are
better for coarse feeding.