Acer e-mill 3VK, Operation Manual

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- 9 5 -
6 -2 D r a w B a r
DO NOT attempt to change spindle RPM u nless the motor is running, expressed
speeds will only be approximate. Belt wear will cause variations in speed, from the
speed indicated by the digital counter .
When tightening or loos ening the drawbar, it is necessary to lock the spindle. To
do this, use the spindle brake (5 ) which is loc ated on the left side of the belt
housing. Pull it down until the spindle binds. Make sure the quill is raised all the
way.
Drawbar has
7
/
1 6 ” - 2 0
right hand thread on model 3VS, 3VSII, 3VK, 3VKH; 5/8” -11
right hand thread on model 5VK, 6VK, and should be tightened with normal
pressure using wrench furnished with machine. To loo sen collet, back off drawbar,
and i f collet does not open immediately , please give the top of drawbar a slight tap.
The s pindle has non -sticking taper and the collet should release easily.
6-3 Spindle Brake (#5 )
Brake lever must be pull down to stop spindle electronically . When locking
spindle, lever should be pull-down. There are no adjustments on brake, so it must
be replaced when worn out.
CAUTION
BE CERTAIN THAT THE SPINDLE BRAKE IS
RELEASED BEFORE STAR TING THE MOTOR. THE
MOTOR CAN BE DAMAGED IF SWITCH IS TURNED
ON WITH BRAKE IN LOC KED POSITION.
6-4 Forward-Reverse S witch (#3)
This is the motor reversing switch. When the head is in direct drive (High Range)
the motor and spindle are turning the same direction. When the head is in “Back
Gear” (Low Range) the spindle runs backwards unless the motor direction is
reversed.
6-5 Hi-Neutral-Lo Lever (#18 on 5HP or #20 on 3HP )
This lever is used to put the head into either direct drive or back gear. Rotate the
spindle by hand to facilitate meshing of clutch or gears.
Neutral can be obtained at mid -way position, and is provided to permit free spindle
rotation for indicating and set -up.
After an extended period of use, the neutral position may cause noise by allowing
the clutch teeth to rub each other. This can be corrected by loosening set screw
(#43, page 111 ) and reversing the position of the detent plate (#44, page 111 ).
In high speed (Direct Drive), the spindle is driven by ta pered clutch teeth. If the
clutch is not meshed tightly, clutch rattle will be heard. This can be corrected by
moving the detent plate upward as the clutch wears. This may also cause loss of
neutral, requiring reversal of the detent plate.