Sharp VH25 User manual

OPERATOR’
S
MANUAL
SHARP INDUSTRIES, INC.
310-370-5990
edition : A02
LC-20VSG
VH-25 Series

OPERATOR’S MANU`AL
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CONTENTS
1
、 FORWORD P 1
2 、 Safety Rules and Regulations P 1
3 、 Capacity P 1
4 、 Specifcations of 20 Series of Milling Machine P 2
5 、 Machine Body P 4
A
、 Stepless Speed Headstock (20VS,20VA,20VAG,20VHA) P 4
a. Name of Machine Parts P 4
b. Headstock Lubrication P 5
c. Operations P 6
d. Trouble Shootings P 10
B
、 Headstock (20VB,20VC) P 15
a. Name of Machine Parts P 15
b. Headstock Lubrication P 17
c. Operations P 19
6 、 Machine Body P 26
A、Name of Machine Parts P 26
B 、 Machine Lubrication P 28
C
、 Operations P 30
D 、 ADJUSTMENT P 37
7 、 Transport, Unpacking and Floor Space P 42
A
、 Methods of Transport P 42
B 、 Cautions for Unpacking P 44
C 、 Floor Space P 44
8 、 Precision Alignment P 45
9 、 Maintenance P 50
10 、 Cutting Condition Chart P 53
11 、 Cautions P 56
12 、 Remarks P 57

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MODIFICATION RECORDS
DATE PAGE ORIGINAL MODIFIED ED MEMO
2010.6.7 44 FIG 54 A02

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1.FORWORD
LONG CHANG 20 SERIES OF MILLING MACHINES are designed and manufactured to meet the demands
by most of out customers.
All parts and materials have beer placed under strict quality control to ensure the machine quality superiority
and permanent service life.
This manual shall give a detailed account of the structure, mechanism, methods of operation, maintenance,
etc. of 20 Series Millers. For permanent hi-precision and maximum efficiency of each and every machine,
the operators, maintenance and repair personnel are requested to study this manual thoroughly and follow
the specific instructions in operations and maintenance exactly.
2.Safety Rules and Regulations
(1) Wearing of loose clothes by operatiors is not allowed.
(2) Operators shall wear the goggles and safety boots.
(3) Do not allow the body to get too close to the machine while it is in revolution.
(4) Cautions must be exercised in machine handling in reference to the specific details in this manual.
3.Capacity:
(1) Vertical units :
1、Drilling : Front and oblique, drillings.
2、Boring : Front and oblique borings by cutters installed.
3、Molding : Processing of irregular curves and mold removing angles.
4、Polishing : Surface polish on metalic parts.
5、Milling : Face, oblique, end, side millings, etc.
(2) Vertical- Horizontal Units :
1、Same as vertical units from ( 1 ) to ( 5 ).
2、Cross Milling : Plain milling, slab milling, side milling, gaug milling, cutting off, etc.

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4.Specifcations of 20 Series of Milling
Machine:
STANDARD SPECIFICATIONS :
MODEL LC-20VS LC-20VA LC-20VB LC-20VC
Table
Working Surface 1300x260mm
Longitudinal travel 970mm
Cross travel 420mm
Vertical travel ( knee ) 450mm
Motor
Vertical spindle motor 3HP 4P 3HP 4P
Weight 1400kg 1380kg 1370kg
Vertical main spindle
Spindle speeds variable 50HZ
60HZ
50-3750rpm 68-2280rpm
60-4500rpm 80-2760rpm
Spindle taper NST 40 NST 30 or R8
Quilltravel 127mm
Quill feed (per revolution of spindle) 0.04 0.08 0.14
Head swivel (R&L) 90°, (F&B)45°(R&L) 90°(R&L) 90°, (F&B) 45°
Overarm travel 470mm
Overarm swivel 360°
Spindle nose to table 100-550mm 70-520mm
Spindle centerline to column surface 360-830mm 255-725mm 270-740mm

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STANDARD SPECIFICATIONS :
MODEL LC-20VSG LC-20VGA LC-20VHS LC-20VHA
Work table
Working Surface 1300x260mm 1300x260mm
Longitudinal travel 790mm 790mm
Cross travel 420mm 420mm
Vertical travel ( knee ) 420mm 420mm
Longitudinal feeds 22-690/min 22-690/min
Longitudinal rapid traverse 2100/min 2100/min
Vertical fdde ( knee ) 800/min 800/min
Motor
Vertical spindle 3HP 4P 3HP 4P
Horizontal spindle 5HP 4P
Longitudinal feed 1/,1/2HP 4/8P 1/,1/2HP 4/8P
Vertical feed 1.5HP 6P 1.5HP 6P
Collant pump 1/8HP
Weight 1550kg 1760kg
Vertical main spindle
Spindle speeds Variable 50HZ
60HZ 50-3750rpm 50-3750rpm
60-4500rpm 60-4500rpm
Spindle taper NST #40 NST #40
Quill travel 127mm 127mm
Vertical feeds (per revolution of
spindle) 0.04 0.08 0.14 0.04 0.08 0.14
Head swivel (R&L) 90°, (F&B)
45°(R&L) 90°(R&L) 90°, (F&B)
45°(R&L) 90°
Overarm travel 470mm 470mm
Overarm swivel 360°360°
Spindle nose to table 100-550mm 115-565mm
Spindle centerline to column
surface
Horizontal main spindle
Spindle speeds 50HZ
60HZ 45,80,165,260,500,980
55,100,200,315,600,1180
Spindle taper NST #40
Spindle centerline to table surface 0-440mm
Spindle centerline to overarm
underside 146mm
Spindle nose to column surface 24mm

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5.Machine Body
A、Stepless Speed Headstock (20VS, 20VA, 20VSG, 20VAG, 20VHA)
a. Name of Machine Parts :
FIG.1

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b. Headstock lubrication :
Adopted with dripping lubricant in the headstock, it is to reassure driving machanism and smooth
slidings. Please refer to the chart as hereunder specified.
FIG.2
Item Position Lubricant Time(s) Q’th
1 Headstock Matching Quill Holes KUOKUANG R-68 Twice Daily Full

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c. Operations :
1、Spindle brake : brake lever (E)
When arrow mark in (D) position, spindle motor power is on. When arrow mark in (C)
position, spindle motor power off through the engagment of micro switch. When arrow
mark in (B) position, make spindle braked.The lever is cam operated and will never return
back until you push it. The spindle will be powered again as you push it to position (D). All
are controlled electricmagnetically. This will off you a great convenience for immediate
stop of spindle and shifting back gears.
ADJUSTMENT (Fig 3)(A)
After long period usage, the brake shoe might be loosed and some adjustment is
required. Use a flat head driver to adjust the bolt inside the hole at left-front position of
pulley cage. Clockwise will tight the brake. Counter-clockwise will loost it.
2、Chucking of tooling shank and dismantling :
First the spindle must be raised up to its maximum height. The screw of draw bar is right
turn. When the screw is turned clockwise, it is for locking of tooling shank, the draw bar
must be turned from three to five rounds. Then, use a soft mallet to hit lightly on the draw
bar to allow the tooling shank to separate from the spindle. Turn the draw bar, until the
tooling shank comes off totally.
Note : According to Spindle Braking, brake the spindle to a stop and the tooling shank
may easily come off or chuck on.
FIG.3

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3、Quill feed :
a. Manual feed :
Turn the feed rate selector to any of the two “DUMMY” position.
Engage feed trip lever from (B) to (B’)
The quill is now under handwheel (G) control
b. Automatic feed :
Ensure quill lock is off (C)
Set micrometer dia to required depth, (D)
Engage Feed Clutch Selector (E)
Select feed rate, (A)
Engage feed trip lever (B) to (B’)
The feed will automatically trip out at a depth within 0.2mm.
Note :
1. To interrupt power feed, just press down the disengagment lever (F).
2. Maximum drilling capacity in automatic feed is 3/4” (19mm).
3. The power feed transmission engagement crank shall be placed at “OUT”
position when the automatic feed is not in operation. Do not move power feed
transmission engagement crank when the spindle is in revolution.
4. Do not use automatic feed when the turning speed is in excess of 3,000RPM.
5. Do not change the feed speed optionally by means of quill speed selector druing
the revolution.
6. Lock up the quill lock of quill for far better milling surface when the unit is not
making the manual or automatic feed.
FIG.4
B'
B
G
A
E
F
C
H
D

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4、Speed change of spindle :
By means of the variation of one set of sliding belt pulley and counter shaft gear (high or low
speed), the spindle revolution speed is changed accordingly.
a. Change of high and low speeds : (Fig 4)
Brake the spindle
Push and Turn lever (H) in either direction to the next horizontal. You can feel the “SNAP IN”
correct position through the ball-spring mechanism. If difficulty happened in meshing gears,
inching the spindle through brake lever.
Notes :
1. The spindle must be motionless completely during the speed change.
2. To shift the high speed into the low one, the spindle must be slightly turned to make it
easier for the counter shaft to engage.
3. To shift the low speed into the high one, use the brake lever so as to put a stop to the
spindle clutch. Then turn the spindle slightly so that clutch may be engaged feasibly A
“ click ” sound of engagement may be sensed at this moment.
b. Speed change handwheel :
Stepless speed variation between high and low speeds may controlled by means of turning
handwheel ( A ) (Fig 5). When it is turned clockwise, it is for higher speed.
Note :
1. Do not change the speed when the spindle stands still.
2. Avoid to use it when the speed is in excess of 3,000 RPM.
3. In the process of speed change from high speed to low speed, and vice-versa, do not
change the speed rapidly to safeguard the service life of the internal mechanism.
4. It takes roughly 10 to 15 second to change from low speed to the high one.
FIG.5

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5、Tilting of headstock 20VS 20VSG 20VHS
Cross tilting (Fig 6)
a. Draw out 2 zero position securing taper pins.
b. Loosen 4 lock nuts ( A ).
c. Turn the worm shaft ( B ) so as to tilt the head stock to the desired position.
d. Lock up 4 lock nuts ( A ) evenly.
FIG.6 FIG.7
6、Headstock Tilting : 20VS 20VSG 20VHS
In-and-Out Tilting (Fig 8) :
Turn loose evenly the eight adapter locking bolt ( P Both sides ) and turn the vertical
adjusting worm shaft ( Q ) until the angle desired is obtained. Lock up bolts ( P Both
side )tightly.
Note : Do not loosen all the headstock bolts totally.
FIG.8

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d. Trouble Shootings :
1、Dismantling of 20VS, 20VA, 20VB, 20VSG, 20VGA, 20VHS, 20VHA, Motor (Fig 9) :
a. Start the motor and turn the speed change handwheel ( A ) to the position of 60 RPM appeared on
the indicator to lower down the stationary motor varidisc to the lowest position.
b. Cut off the motor power source and take off main power source.
c. Remove motor pulley cover ( B ) under the motor shaft. Then, use the two hexagonal concave
bolts ( C ) that locked the bearing housing, to insert into the two holes of the speed change spring
pieces ( D ). Lock into the motor var-disc ( E ) and evenly lock up the two bolts ( C ). Push down
the speed change spring ( F ) so as to separate it from the retainer ring ( G ).
d. Take out the retainer ring ( G ).
e. Take off the two hexagonal bolts ( H ) that locked the motor. The motor may be lifted up. Motor
vari-disc ( E ) and speed change belt are still kept inside the belt housing.
f. Once the motor is replaced, just reverse the order of dismantling.

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A
C
B
C
E
GD
F
H
FIG.9
2、Replacement of speed change belt ( R ) (Fig 10)

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a. Please refer to Step a to e on motor dismantling.
b. Pull out drawbar ( 1 ) .
c. Take off three concave hexagonal bolts ( 1 ) and use two of them to push up the bearing
cover ( K ).
d. Take down the two concave hexagonal bolts ( L ) setting the pressboards from the top
and take out the bolt housing ( M ).
e. Take off the six concave hexagonal bolts ( N ).
f. Use a soft mallet to hit the belt housing ( Q ) lightly upward so as to disengage it from
the gear hoursing ( P ).
g. Reverse the order of dismantling to restore the assembly once the speed change belt is
replaced.
Note : Replacing speed change belt shall conform to that of our company specifications.

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P
N
O
J
L
K
M
I
Q
FIG.10
3、Replacement of brake block (Fig 11,12) :

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a. Refer to Step a to e on motor dismantling.
b. Refer to Step b to g on replacement of speed change belt to dismantle the upper belt
housing.
c. Remove the spindle pulley off.
d. Use flat head screw driver to kick-off the two half piece of brake shoe ( A ).
e. Remove the two springs ( B ).
f. Press the assembled brake shoe to rear support pin ( C ) first, then to the front cam
( D ).
g. For new brake shoe, some adjustment is required.
Fig.11
Fig.12
A
DB
C
B
A
A
B

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B、EADSTOCK : 20VB, 20VC
a. Names of Machine Parts :
1、20 VB Headstock :
FIG.13

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2、20 VC Headstock :
FIG.14

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b. Headstock Lubrication :
1、20 VB Headstock :
FIG.15
Item Position Lubricant Time(s) Q’th
1 Head Stock Matching Quill Holes KUOKUANG R-68
ESSO FEBIS K53 Twice Daily Full
2 Bull Gear Bearing Sleeve GULF WAY 52 Twice
Weekly Full
3 Counter Shaft Gear Worm Gear Cradle VACTRA NO.2
SHELL TONNA 33 Once Daily Full