CHESTER Cobra Mill Instruction Manual
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CHESTER Cobra Mill is a versatile and capable machine designed for precision milling tasks. With its 10mm drilling capacity, 10mm end milling capacity, and 20mm face milling capacity, it can handle a wide range of projects. The variable speed control knob allows you to adjust the spindle speed from 100 to 2000rpm for optimal performance with different materials. The MT2 spindle taper and 150W motor provide ample power for your milling needs. The machine's compact size and lightweight design make it easy to move and store, while its sturdy construction ensures stability and durability.
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Cobra Mill
Instruction Manual
Chester UK Ltd
Clwyd Close, Hawarden Industrial Pk
Hawarden, Nr Chester
Flintshire. CH5 3PZ
Tel: 01244 531631
Email: [email protected] www.chesteruk.net
Contents
1. Introduction
2. Health & Safety
3. Machine Specification
4. Operation
5. Controls
6. Part Diagrams & Lists
7. Circuit Diagram
8. Guide To Milling
2
3 5
6 7
8 9
10
11 13
14 15
16
Chester UK Cobra Mill
1
Introduction
Chester UK Limited is a specialist company that has been supplying the machine tool industry for over 15 years. The Chester UK Head Office comprises of a 30,500sq.ft factory complete with offices and a showroom. Specialising in conventional machine tools, Chester has built a reputation for quality and reliability, which is highly regarded in the machine tool industry and the model engineering market.
There are several divisions within the company; Export, Education, Model Engineering & UK Sales, all with dedicated sales personnel who are trained to answer your questions.
When buying from Chester you can be assured of a complete backup service with mechanical and electrical engineers that are available to give advice if required.
Stock is a large part of any business and Chester have always invested substantially in building a large quantity of machines and spares, ready to satisfy customer requirements. Chester UK has one of the largest stocks of conventional new machines and accessories within Great Britain. Please take time to visit our website: www.chesteruk.net
Chester UK Cobra Mill
2
Health & Safety
As with all machinery there are certain hazards involved with the operation and use of the lathe.
Using the machine with respect and caution will considerably lessen the possibility of person injury.
However, if normal safety precautions are overlooked or ignored, personal injury to the operator may result.
This machine was designed for certain applications only. We strongly recommend that the machine is not modified, and / or used for any application other than which it was designed.
If you have any questions relative to its application do not use the machine, until you have first been in contact with Chester
UK.
The lathe may not arrive with a power socket or plug. In the event of this happening, please inform
Chester UK on Tel: (01244) 531 631.
Safety rules for all tools
User
1. Wear correct apparel
No loose clothing, gloves, rings, bracelets or other jewellery to get caught in moving parts. Non slip footwear is recommended. Wear protective hair covering to contain long hair.
2. Always wear eye protection
Refer to ANSLZ87.1 standard for appropriate recommendations. Also use face and / or a dust mask if the cutting operation is dusty.
3. Don’t overreach
Keep a proper footing and balance at all times.
4. Never stand on a tool
Serious injury could occur if the tool is tipped or if the cutting tool is accidentally contacted.
5. Never leave the tool running unattended
Turn power off.
Leave tool until it comes to a complete stop.
6. Drugs, alcohol and medication
Do not operate the tool while under the influence of drugs, alcohol or any medication.
7. Make sure the tool is disconnected from the power supply
While motor is being mounted, connected or reconnected.
8. Always
Keep hands and fingers away from any moving parts.
9. Stop
The machine before moving chips.
10. Shutoff
Power and clean the lathe and work area before leaving the machine.
Use of the machine
1. Remove adjusting keys and wrenches
Form a habit of checking to see that keys and adjusting wrenches are removed from the tool before turning it ‘on’.
2. Don’t force the tool
It will do the job better and be safer at the rate for which it was designed.
3. Use the right tool
Don’t force the tool or attachment to do a job for which it was not designed.
4. Secure work
Use clamps or a vice to hold work when practical. It’s safer than using your hands, and frees both to operate the machine.
Chester UK Cobra Mill
3
5. Maintain tools in top condition
Keep tools sharp and clean for the best and safest performance. Follow instructions for lubricating and changing accessories.
6. Use recommended accessories
Consult Chester UK for recommended accessories. The use of improper accessories may cause hazards.
7. Avoid accidental starting
Make sure the switch is in the ‘ OFF’ position before plugging in power cord.
8. Stop
The machine before putting material in the vice.
9. Always
Have stock firmly clamped in the vice before starting the cut.
10. Ground all tools
If the tool is equipped with a threeprong plug, it should be plugged into a threehole electrical receptacle. If an adapter is used to accommodate a twoprong receptacle, the adapter plug must be attached to a known ground. Never remove the third prong.
Adjustment
Make all adjustments with the power off. When assembling follow the manuals instructions, this will ensure correct instruction and a safe structure.
Working environment
1. Keep the work area clean
Cluttered areas and benches invite accidents.
2. Don’t use in a dangerous environment
Don’t use power tools in damp or wet locations, or expose to rain. Keep the work area well lit.
3. Keep children etc at a safe distance.
All children etc should be kept at a safe distance from the work area.
4. Don’t
Install & use this machine in an explosive dangerous environment.
Maintenance
1. Disconnect
Machine from the power source when making repairs.
2. Check damaged parts
Before further use of the tool, a guard or other part that is damaged should be carefully checked to ensure that it would operate properly and perform its intended function check for alignment of moving parts, binding of moving parts, breakage of parts, mounting and any other conditions that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced.
3. Disconnect tools
Before servicing and when changing accessories such as blades bits, cutters, etc.
4. To prevent
The corrosion of machined surfaces when a soluble is used as coolant, pay particular attention to wiping dry the surfaces where fluid accumulates and does not evaporate quickly, such as between the machine bed and vice.
Chester UK Cobra Mill
4
Safety Device
1.
Interlock switch on pulley cover. As soon as the pulley cover is open, the machine will come to a stop with the function of this switch. Do not remove this switch from the machine for any reason, and check it’s function frequently.
2.
Interlock switch on cutting area. As soon as the pulley cover is open, the machine will come to a stop with the function of this switch. Do not remove this switch from the machine for any reason, and check it’s function frequently.
Chester UK Cobra Mill
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Machine Specification
Drilling Capacity
End Milling Capacity
Face Milling Capacity
Spindle Stroke
Throat
Table Working Surface
Longitudinal Travel
Cross Travel
Max. Distance Spindle To Table
No. Of Spindle Speeds
Range Of Speeds
Spindle Taper
Motor
Supply
Weight (nw/gw)
Dimensions (LxWxH)
10mm
10mm
20mm
30mm
140mm
145x240mm
180mm
90mm
220mm
Variable
1002000rpm
MT2
150W
240V
25/38kg
480x380x680mm
Chester UK Cobra Mill
6
Features
1.
Forward/Off/Reverse Switch 2.
Variable Speed Control Knob 3.
Fuse Box
4.
Power Light (Green) 5.
Yellow Light (only 110V) 6.
High Low Change Knob
7.
10.
Work Table
13.
Handle
8.
Fine Feeding Handwheel
11.
14.
Cross Feed Handwheel
Lifting Handwheel
9.
12.
15.
Longitudinal Feed Handwheel
DC Motor
Chester UK Cobra Mill
7
Operation
Installation Of The Tapered Shank
1. Disconnect from the main power supply, before you replace the cutter.
2. Remove the protective cover (a).
3. Wipe the spindle sleeve and taper shank.
4. Put the taper shank (i) into the spindle sleeve. Matt the cutter with an oilcloth.
5. Use a #14 openend wrench (c), turning the spindle draw bar (clockwise) (b), in order to secure the tapered shank.
6. Pull out the fixing pin
7. Install the protective cover (a).
Removal Of The Tapered Shank
1. Disconnect from the main power supply, before you replace the cutter.
2. Remove the protective cover (a).
3. Use a#14 openend wrench (c), to loosen the spindle draw bar (counterclockwise) (i), in order to remove the tapered shank.
4. Knock the taper shank (i) (gently with a plastic hammer) to loosen it in the spindle sleeve.
5. Matt the cutter with an oilcloth.
6. Install the protective cover (a).
Chester UK Cobra Mill
8
Travel Adjustment
The lifting handle can be used to control the travelling of the spindle box.
1. Loosen the screw inside the spindle box.
2. Rotation of the lifting handle will move the spindle box up or down.
Fine Feeding
To operate the fine feed, push the clutch lever in. This will enable the handwheel for the fine feed.
Mitre Wedge Adjustment
In the long term wear will occur on the dovetail. This will cause inaccuracy that can be eliminated by adjusting the mitre wedge (adjusting the dovetail gib strip). Adjusting the screw slides the tapered strip to reduce the gap and restore accuracy of the mill.
The following adjustments are possible :
1. Base & YAxis Cross Slide .
2. XAxis Cross Slide & Work Table
3. Mill Head Seat & Vertical Column.
4. Mill Head & Spindle.
The Way To Adjust
1. Loosen the locked nuts.
2. Adjust the foremost pressure of the mitre wedge by locked nut. If necessary, loosen all the adjusting screws to the same.
3. Tighten and loosen the adjusting screws, also keeping the pressure of each adjusting screw the same.
4. Tighten the locked nut uniformly.
5. When the nut is locked, please use the #3 interior hexagonal wrench to fix the adjusting screw from rotating (this will cause an unbalance in the pressure).
6. Please adjust the middle portion first and then go to toward the interior from two sides uniformly while you are adjusting the screw in order to ensure uniform pressure.
Chester UK Cobra Mill
9
Controls
Initial Start
S et the HIGH / LOW range lever to low. Connect to the power supply. Select FORWARD, using the
FORWARD / OFF / REVERSE Switch (A) on the main control Panel, then the power lamp (B) lights.
Switch on the Cobra Mill by slowly turning the Variable Speed Control Knob (C) clockwise.
The speed will increase progressively the further the knob is turned.
Run for a total of 5 minutes; gradually increase the spindle speed to its maximum. Run at top speed for at least 2 minutes at top speed before stopping.
Check that all components are secure, working freely and correctly.
Check that the Cobra Mill is mounted securely.
Repeat the procedure at a HIGHspeed setting.
Caution
Never attempt to change from a HIGH to a LOW speed whilst the machine is running.
Starting Under Normal Conditions
1. Take all the necessary precautions previously stated, and ensure the workpiece is fixed firmly.
2. Select an appropriate speed level.
3. Select the FORWARD / off / REVERSE to a FORWARD or REVERSE position.
4. Proceed to start the machine as described above.
5. Whilst not in use, switch off and disconnect from the power supply.
Notice
When using 100~120v power, the socket will have to have a auto overload protective function. If the feed is to fast, or the drilling is too deep, the Cobra Mill will stop working and a yellow light (behind the fuselage) will light up. By turning the Variable Speed control knob (D) and then turn on again, the Cobra will now work again and the yellow lamp will off automatically.
Chester UK Cobra Mill
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Part Diagrams & Lists
Chester UK Cobra Mill
11
No.
1
Description
Screw M4 x 12
2 Cover for the motor
3 Screw M6 x 12
4 Spring washer 6
5 Washer 6
6 DC motor
7 Round key
8 Check ring for shaft 8
10 Motor gear
11 Safety cover
12 Screw M4 x 6
13 Screw M4 x 8
14 Washer 4
15 Up cover
16 Sleeve support plate
17 Screw M6 x 5
18 Compression spring
19 Steel ball 5
20 Gear box
21 Spindle sleeve
22 Screw M6 x 14
23 Bearing 61905 2E
24 Spindle box
25 Check ring for hole 38
26 Spring seat ring
27 Compression spring
28 Round nut stop gasket
29 Round nut M24 x 1.5
30 Spindle gear
31 Spacer
32 Spindle gear
1
1
33 Check ring for shaft 20 1
34 Powder metallurgy bearing 2
35 Gear
36 Check ring for shaft 10
37 Change gear
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
2
1
1
1
1
1
4
4
1
Q'ty No.
2
Description
38 Shift shaft
1
1
2
1
3
3
3
39
40
41
42
43
44
Key 4 x 8
Key 4 x 12
Change gear
Dial fork
Flange lining
Check ring 21
45 Spacer 1
46 Variable speed control knob 1
47 Spring pin 2 x 12
48 Wedge
49 Screw M5 x 18
Q'ty
1
2
1
1
1
4
1
1
1
1
50 Nut M5
51 Handle
52 Pin A3 x 12
4
1
1
53 Joint shaft
54 Screw M5 x 18
55 Joint screw
56 Worm base
57 Helical gear
58 Spacer
59 Pin A3 x 18
60 Key 2 x 18
61 Worm shaft
62 Dial
63 Damp spring
64 Hand wheel
1
1
1
1
1
1
1
1
1
1
1
1
67
71
72
73
74A
Washer 6
68 Top nut M6
69 Screw M6 x 20
Screw M4 x 20
Screw M4 X 18
Nut M4
Base
4
4
1
2
8
8
1
Chester UK Cobra Mill
12
No. Description
75 Screw M6 x 20
77 Lock screw
78 Spindle
79 Key 4 x 28
84 Screw M8 x 50
85 Fix screw
86 Gear shaft
87 Handle shaft
88 Long handle sleeve
89 Spring pin 3 x 12
90 Mark show sleeve
91 Screw M5 x 8
92 Screw M6 x 20
93 Pin 6 x 26
94 Nut block
95 Lifting screw
96 Screw support
97 Hand wheel
98 Handle bolt
99 Handle sleeve
100 Key 3 x 10
101 Cover board
102A Fuselage
103 Screw
105 Worktable
107 Damp spring
108 Dial
109 Screw M6 x 16
110 Screw base
111 Lengthways screw
112 Screw M4 x 8
113 Screw nut
114A Saddle
115 Wedge
116 Change speed label
117 Joint label
118 0 position label
1
1
2
4
2
1
2
4
2
2
3
3
1
1
1
1
3
3
4
1
2
2
Q'ty No.
2 119
Description
Dial label
1
1
1
1
1
1
1
1
2
1
2
4
2
1
120 Electricity box
121 PC Board
122 Power indicator light
123 Fuse box
124 Metachoresis switch
125 Forward/reverse switch
126 Electricity label
127 Screw ST2.9 x 6.5
128
129
130
*131
Power line
Caution label
Spindle axis label
Technical parameter label
*132 Drill chuck
*133 Inside Six hom Wrench S:3,6
*134 Double end Wrench: 5.5*, 8*10 1
*135 Round nut Wrench D = 38 42 1
*136 Oil can
*137 Fuse
1
1
*138 Taper shank
*139 Chuck key
*140 T nut
141 Cross screw
1
1
4
1
142 Cross wedge
143 Connect plate support
144 Connect flange
145 Round clamp plate
1
1
1
1
146 Scale
147 Finger
148 Screw M6*6
149 Screw M8*25
150 Screw M6*25
151 Label rivet 2*3
152 Pin 6*35
4
2
2
2
1
1
1
Q'ty
1
1
1
1
4
1
1
1
1
1
1
1
1
1
1
Chester UK Cobra Mill
13
Circuit Diagram
220~240V / 5060Hz
Chester UK Cobra Mill
14
100~120V / 5060Hz
Chester UK Cobra Mill
15
Guide To Milling
Contents
1. Introduction
2. Types of Milling Machine
2.1 Horizontal Milling Machine
2.2 Vertical Milling Machine
3. Cutting Tools
3.1 Cutting Tools for Horizontal
Milling Machine
3.2 Cutting Tools for Vertical
Milling Machine
4. Industrial Applications
5. Milling Processes
5.1 Spindle Speed
5.2 Feed Rate
5.3 Depth of Cut
5.4 Direction of Cutter Rotation
6. Typical Milling Operations
6.1 Plain Milling
6.2 End Milling
6.3 Gang Milling
6.4 Straddle Milling
7. Milling Set Up
7.1 Vice Alignment
7.2 Work Holding Method
8. Safety
1. Introduction
Milling machine is one of the most versatile conventional machine tools with a wide range of metal cutting capability. Many complicated operations such as indexing, gang milling, and straddle milling etc. can be carried out on a milling machine.
This training module is intended to give you a good appreciation on the type of milling machines and the various types of milling processes. Emphasis is placed on its industrial applications, operations, and the selection of appropriate cutting tools.
On completion of this module, you will acquire some of these techniques from the training exercises as illustrated in figure 1.
However, to gain maximum benefit, you are strongly advised to make yourself familiar with the following notes before undertaking the training activities, and to have a good interaction between yourself and the staff in charge of your training.
Assessment of your training will be based on a combination of your skill and attitude in getting the work done.
Figure 1. Milling Products
2. Types of Milling Machine
Most of the milling machine are constructed of ¡¥column and knee¡¦ structure and they are classified into two main types namely Horizontal Milling Machine and Vertical Milling Machine. The name
Horizontal or Vertical is given to the machine by virtue of its spindle axis. Horizontal machines can be further classified into Plain Horizontal and Universal Milling Machine. The main difference between the two is that the table of an Universal Milling Machine can be set at an angle for helical milling while the table of a Plain Horizontal Milling Machine is not.
2.1. Horizontal Milling Machine
Figure 2 shows the main features of a Plain Horizontal Milling Machine.
Their functions are : a. Column
The column houses the spindle, the bearings, the gear box, the clutches, the shafts, the pumps, and the shifting mechanisms for transmitting power from the electric motor to the spindle at a selected speed.
b. Knee
The knee mounted in front of the column is for supporting the table and to provide an up or down motion along the Z axis.
c. Saddle
The saddle consists of two slideways, one on the top and one at the bottom located at 90º to each other, for providing motions in the X or Y axes by means of lead screws.
d. Table
The table is mounted on top of the saddle and can be moved along the X axis. On top of the table are some Tslots for the mounting of workpiece or clamping fixtures.
e. Arbor
The arbor is an extension of the spindle for mounting cutters. Usually, the thread end of an arbor is of left hand helix.
Figure 2. Horizontal Milling Machine
2.2. Vertical Milling Machine
Figure 6. Slitting Saw
Note: Horizontal milling cutters are specified by the name, the material, the width, the diameter, and the hub size of the cutter.
Example Side and face cutter,
High Speed Steel,
Cutter size : 10 X ø 100
Hub size: ø 25
3.2. Cutting tools for Vertical Milling a. End Mills
Commonly used for facing, slotting and profile milling.
b. Rough Cut End Mills
For rapid metal removal.
Figure 7. End Mill c. Slot Drills
For producing pockets without drilling a hole before hand.
Figure 8. Rough Cut End Mill
Figure 9. Slot Drill d. Face Milling Cutters
For heavy cutting.
Figure 10. Face Milling Cutter
Note: Most vertical milling cutters are of end mill types and are specified by the material, the diameter, the length, the helical angle, the types of shank and the shank diameter. For face milling cutter, only the diameter of the cutter and the types of carbide inserts are required.
4. Industrial Applications
Milling machines are widely used in the tool and die making industry and are commonly used in the manufacturing industry for the production of a wide range of components as shown in figure 11.
Typical examples are the milling of flat surface, indexing, gear cutting, as well as the cutting of slots and keyways.
When equipped with digital readout, the machine is capable of producing more precise work for the manufacturing of plastic moulds, tool & dies, and jigs & fixtures. Figure 12 shows a typical plastic mould produced by milling.
Figure 11. Components Made by Milling
Figure 12. Plastic Mould
5. Milling Processes
Milling is a metal removal process by means of using a rotating cutter having one or more cutting teeth as illustrated in figure 13.
Cutting action is carried out by feeding the workpiece against the rotating cutter. Thus, the spindle speed, the table feed, the depth of cut, and the rotating direction of the cutter become the main parameters of the process.
Good results can only be achieved with a well balanced settings of these parameters.
Figure 13. Milling Process
5.1. Spindle Speed
Spindle speed in revolution per minute (R.P.M.) for the cutter can be calculated from the equation : where N = R.P.M. of the cutter
CS = Linear Cutting Speed of the material in m/min. ( see table 1 ) d = Diameter of cutter in mm
5.2. Feed Rate
Feed rate (F) is defined as the rate of travel of the workpiece in mm/min. But most tool suppliers recommend it as the movement per tooth of the cutter (f). Thus,
F = f . u . N where F = table feed in mm/min f = movement per tooth of cutter in mm ( see table 1 ) u = number of teeth of cutter
N = R.P.M. of the cutter where
C.S. and feed rate for some common material :
Tool Material
Material
Mild Steel
Aluminium
Hardened Steel
High Speed Steel
Cutting
Speed
25
100
Feed (f)
0.08
0.15
Table 1
Carbide
Cutting
Speed
100
500
50
Feed (f)
0.15
0.3
0.1
5.3. Depth of Cut
Depth of cut is directly related to the efficiency of the cutting process. The deeper the cut the faster will be the production rate. Yet, it still depends on the strength of the cutter and the material to be cut.
For a certain type of cutter, a typical range of cut will be recommended by the supplier. Nevertheless, it should be noted that a finer cut is usually associated with a better surface finish as well as a long tool life.
5.4. Direction of Cutter Rotation a. Up Cut Milling
In up cut milling, the cutter rotates in a direction opposite to the table feed as illustrated in figure
14. It is conventionally used in most milling operations because the backlash between the leadscrew and the nut of the machine table can be eliminated.
Figure 14. Up Cut Milling b. Down Cut Milling
In down cut milling, the cutter rotates in the same direction as the table feed as illustrated in figure
15. This method is also known as Climb Milling and can only be used on machines equipped with a backlash eliminator or on a CNC milling machine. This method, when properly treated, will require less power in feeding the table and give a better surface finish on the workpiece.
Figure 15. Down Cut Milling
6. Typical Milling Operations
6.1. Plain Milling
Plain milling is the milling of a flat surface with the axis of the cutter parallel to the machining surface. It can be carried out either on a horizontal machine or a vertical machine as shown in figure 16.
6.2. End Milling
End Milling is the milling of a flat surface with the axis of the cutter perpendicular to the machining surface as shown in figure 17.
Figure 17. End Milling
6.3. Gang Milling
Gang milling is a horizontal milling operation that utilises three or more milling cutters grouped together for the milling of a complex surface in one pass. As illustrated in figure 18, different type and size of cutters should be selected for achieving the desire profile on the workpiece.
Figure 18. Gang Milling
6.4. Straddle Milling
In straddle milling, a group of spacers is mounted in between two side and face milling cutters on the spindle arbor as shown in figure 19. for the milling of two surfaces parallel to each other at a given distance.
Figure 19. Straddle Milling
7. Milling Set Up
Correct use of holding device and a good set up are of crucial importance in achieving a safe, accurate, and efficient operation of the machine.
Large workpiece can be mounted directly onto the machine table by means of tenons and screws while small workpieces are usually held by machine vice as shown in figure 20. In either case, a dial indicator is used for alignment checking.
Figure 20. Machine Vice
7.1. Vice Alignment
In the setting up of the vice onto the machine table, the fix jaw of the vice must be set parallel to the machine table using a Parallel
Bar and a Dial Indicator as illustrated in figure
21. Adjustments can only be made by using a hide face hammer to correct its position such that a near zero indicator movement is achieved at all positions along the parallel bar.
Figure 21. Machine Vice Setup
7.2. Work Holding Method
In the machining of a complex component, it is usually started off with the milling of a rectangular block.
To ensure that each surface of the rectangular block is perpendicular to its neighbouring surfaces, the following points should be noted:
· The vice jaws and the workpiece must be free from burrs, chips, and cutting fluid.
· Smaller workpiece should be supported by parallel bars to provide the supporting datum.
· Round bar must be placed between the workpiece and the movable jaw to ensure that the workpiece is in perfect contact with the fix jaw.
· The vice handle should be tightened by hand to avoid over clamping of the workpiece as well as the vice. Hide face hammer should be used to assure that the workpiece is in perfect contact with the supporting base.
· On completion of the milling of the first face, the workpiece should be unloaded, deburred, and cleaned before the next operation.
· To machine the second and the third faces, the workpiece should be clamped with its preceding machined surface facing against the fix jaw of the vice.
· Similar clamping method can be applied in the machining of the fourth face.
· Yet it can also be clamped on the vice without the round bar.
· Both ends of the workpiece can be machined with the periphery flutes of the cutter using up cut milling as shown in figure 23.
Figure 22. Holding Method by Using a Machine Vice
Figure 23. End Surface Milling
8. Safety
Safety practices of a machine shop should be followed. A complete understanding of the Safety
Rules would enable the students to identify potential hazards that may occur under different working conditions such that appropriate preventive actions can be taken to avoid the happening of accidents.
Emphasis should be given that the eyes of the machine operator must be protected by wearing a face shield (figure 24) to prevent accident that may be caused by chips, cutting fluid, and tool breakage.
Machine operators must also take care of their body such as fingers which keep out of any moving parts, especially the rotating cutter of the machine, to prevent any unnecessary accident hurt. The milling machine must be stopped immediately when any accidence occurred, so the operator must stand near by the control panel of the machine and pays more attention on the operation. Remember the
Chinese phrase 'carefully can be driven the boat in thousand year' that you will enjoy the benefits provided by milling.
Figure 24. Face Shield
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