Machine Structure - Jet JMD-1667 DRO Operating Instructions Manual

2. The high power and wide speed change range of
machine can make full use efficiency of tool, and the
machine can cut workpiece at high speed with
carbide tool.
3. There are the same function pushbutton and
control handle in front of the machine and on the left
of machine, which enable operator to operate the
machine conveniently.
4. All start and stop of spindle and rapid moving start
up of table have visible pushbuttons. table feed is
controlled by handles or pushbuttons, feed direction
accords with the direction of turning control handle;
speed of spindle is controlled by the speed change
tray. The handwheel on the right of the headstock
controls the feed of spindle.
5. Speed change mechanism of spindle and speed
change mechanism of table all rig inching device,
which makes speed change well.
6. The main transmission part is made of alloy steel,
and wearing parts are made of antifriction material,
which make sure working life of machine.
7. Mount adjusting device of eliminate backlash in
wearing position to make sure machining accuracy
and stable run.
8. The machine was equippted with safety device,
mutual interlocking device, stopper in order to make
sure safety of operator.
9. The main transmission adopts electromagnetic
brake, so the machine will thoroughly stop when
pressing STOP pushbutton after work or other
reason.
10. The machine can down milling and up milling.
11. Table can rapid feed in cross, longitudinal,
vertical directions, which can improve work
efficiency.
12. Cross and vertical feed of table is controlled by
only one handle.
13. Main drive parts and bearings are automatically
lubricated by oil pump, an indicator is set to check
the lubricant conveniently. Hand lubrications are set
in obvious positions.
14. Main driving parts and spindle are mounted
through rolling bearing, which can improve drive
efficiency. Adjust the spindle bearing to make sure
the precision of spindle.
Three-direction travels of milling machine are driven
by lead screws, so transmission effieciency is high.
Cross feed may be applicable for up milling. Do not
choose roughing feed when adopting down milling,
otherwise cause kick on the Y travel. Cross
component
force will increase and kick on the cross travel
happens when longitudinal cutting, therefore clamp
handles (2), (28) to prevent cross kick, must loosen
them after cutting, see Fig .2 .
Fig 2
The kind of machine not only has the performance
of general vertical knee-type milling machine, but
also machining and measure workpiece at the same
time when installing DRO device, so make sure the
machining quality of workpiece, and reduce labour
intensity and raise labour productivity.
Vertical knee-type milling machine may adopt DRO
device, and please refer to the instruction of DRO .

6.MACHINE STRUCTURE

The machine is composed of base, column, vertical
milling head, knee, table, spindle transmission, feed
transmission and corresponding speed change
control mechanism, coolant and electrical equipment
and so on. (See Fig.1 )
1. Base and column parts: Column is fixed on the
base with screws; column is box-type construction
cast iron, inner reasonable dispose ribs enhance
rigidity, so base and column are supporting parts of
vertical and table; main motor is fixed at the back of
the column; main transmission system is installed in
the column; speed change box is fixed on the left of
the column; electrical equipment is fixed on both
sides of the inferior of the column. Cooling box is in
the base, cooling pump is on the base.
2. Spindle transmission parts:
Spindle transmission mechanism is installed in the
column, one end of shaftⅠconnects with main motor
through elastic coupling, electromagnetic clutch is
fixed on the other end of the shaftⅠto brake the
spindle. Spiral bevel gear at the end of shaft Ⅴ
connects with vertical milling head. Check and