Main Machine Component Description - Jet GH-2040ZH Mode D'emploi

I, II, III, IV: Lead screw works to cut threads.
A, B, C, D: Feed Rod works to do feeding.
Ratios between them:
I: II: III: IV = A:B:C:D = 1:2:4:8
When a thread excluded from thread chart is to be cut,
you need to move
handle 23 to "-•-"position
handle 20 to "IV" position
then reset the change gears.
Cautions about the machine operation:
Before starting the machine, check the lubrication of all
moving parts.
Be sure that the starting lever is at neutral position.
Turn on the power and the indicator will light.
Then the machine can be started.
Be familiar enough with the machine driving system, the
function and changing
Sequence of all operation levers or handles before
starting the machine.
Check accuracy of lever position. Be sure that levers are
at a fixed position.
All lever positions must be changed only after the
machine has been stopped.

8. Main Machine Component Description

Motor and V-Belt Drive:
The main motor is inside the front stand and coolant
system inside the rear stand.
The belts V-belts should be suitably adjusted by the
adjusting nuts (See Fig 14).
Clutch Type Headstock:
Through a multi-disc friction clutch and different gears,
the power is further transmitted to the spindle.
The spindle's forward or reverse motion is controlled by
Fig 14
the clutch.
The clutch allows the manual control of spindle
starting and spindle reversing.
The clutch also is an overload protection.
Clutch Adjustment:
To ensure normal working of the spindle, the clutch
must be suitably adjusted.
- If the clutch is set too loose, it outputs less power
and is easy to slip and get hot.
- If it is set too tight, it becomes difficult to operate the
forward/STOP/reverse handle and the clutch will not
engage properly.
For forward and reverse rotation the clutch can be
adjusted independently.
- Protect the machine against accidental starting.
( Lock the main switch in Off-position).
- Remove the headstock cover (is made of plastic,
one person can lift it by hand).
- Determine the appropriate clutch
- Use a screwdriver and push in the index pin (B, Fig
15 and Fig 16) ...it is spring loaded.
- Rotate the clutch nut (A) to the next index.
Note:
The clutch reacts quickly, adjust clutch nut (A) by one
division only.
You must feel and hear the clutch
engagement....clicking noise!
If clutch is adjusted too tight, it will not engage.
If the spindle does not stop in the OFF-position, the
forward/reverse clutch adjustment is out of balance.
(The spindle follows the direction with the tighter
clutch adjustment).
16
Fig 15