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The Bi-metal hole saw's fast cutting power lies behind its HSS (hi-speed
steel) manufactured teeth.
The teeth have been set to a variable pitch to
improve harmonic vibration and to have a better chip clearance.
The hole saw can be used to cut into:
Aluminium
Copper
Mild steel (sheet metal)
Stainless steel (sheet metal)
Zinc
Wood
Drywall (plaster board)
PVC
The Bi-metal hole saws are primarily used by electricians, plumbers,
machinists and carpenters.
Features:
Low vibration and even cut due to the variable pitched teeth.
Strong electron beam welded cup design with a tough alloy body for added
durability.
Knock out hole for plug removal.
Depth of cut: 38mm
Long life - when used properly within the correct rpm and using a
lubricant when cutting into metals.
Lubricant tip:
Use paraffin or beeswax when cutting into aluminium. Use
CT-90 or a general-purpose lubricating oil when cutting into steel.
Bi-metal hole saw
Using a hole saw:
To use a hole saw, you need the following accessories:
A portable drill or stationary drill with a 3 jaw chuck.
The correct mandrel and pilot drill for the material being drilled into.
The necessary safety equipment. Safety goggles, gloves and hearing
protection.
IMPORTANT: For the best results and for safety reasons, use the recommended rotation
speed for the material being drilled into.
For longer hole saw life, use the following instructions:
Use the correct mandrel for the diameter hole saw being used.
Use pin-type mandrels for hole saws larger than Ø32mm. When
mounting the mandrel, lift the pins up and then screw the mandrel down into
the hole saw as far as it will go. It is important that the pins holes are
securely located in the hole saw.
Use the correct rotation speed. If the speed is too high or too low will
have an effect on the cutting edge on the hole saw and decrease the life
expectancy.
Clear away wood chips or iron filings frequently to prevent the hole saw
from overheating.
Always apply the necessary pressure for the intended use. Too much
pressure can destroy the teeth when cutting in metals.
Keep the drill going straight to avoid binding the hole saw.
TIP:
When using a hole saw for wood, clamp an off-cut backing board on the
back to prevent tear out when the hole saw exits the material. The backing board
also prevents materials from flexing.
Rotation speed of hole saws (rpm):
DIA.
MILD STEEL
S. Steel
CAST IRON
BRASS
ALU.
WOOD
Ø 14mm
580
300
400
790
900
3000
Ø 16mm
550
275
365
730
825
3000
Ø 17mm
500
250
330
665
750
3000
Ø 19mm
460
230
300
600
690
3000
Ø 20mm
435
240
290
580
660
3000
Ø 21mm
425
210
280
560
635
3000
Ø 22mm
390
195
260
520
585
3000
Ø 24mm
370
185
245
495
555
3000
Ø 25mm
350
175
235
470
525
2700
Ø 27mm
325
160
215
435
480
2700
Ø 29mm
300
150
200
400
450
2700
Ø 30mm
285
145
190
380
425
2400
Ø 32mm
275
140
180
360
410
2400
Ø 33mm
260
135
175
345
390
2400
Ø 35mm
250
125
165
330
375
2400
Ø 37mm
240
120
160
315
360
2400
Ø 38mm
230
115
150
300
345
2400
Ø 40mm
220
110
145
290
330
2100
Ø 41mm
210
105
140
280
315
2100
Ø 43mm
205
100
135
270
305
2100
Ø 44mm
195
95
130
260
295
2100
Ø 46mm
190
95
125
250
285
2100
Ø 48mm
180
90
120
240
270
2100
Ø 51mm
170
85
115
230
255
2000
Ø 52mm
165
80
110
220
245
2000
Ø 54mm
160
80
105
210
240
2000
Ø 57mm
150
75
100
200
225
2000
Ø 59mm
145
75
100
195
225
2000
Ø 60mm
140
70
95
190
220
2000
Ø 64mm
135
65
90
180
205
1800
Ø 65mm
130
65
85
175
200
1800
Ø 67mm
130
65
85
170
195
1800
Ø 68mm
130
65
85
170
195
1800
Ø 70mm
125
60
80
160
185
1800
Ø 73mm
120
60
80
160
180
1800
Ø 76mm
115
55
75
150
170
1500
Ø 79mm
110
55
70
140
165
1500
Ø 83mm
105
50
70
140
155
1500
Ø 86mm
100
50
65
130
150
1200
Ø 89mm
95
45
65
130
145
1200
Ø 92mm
95
45
60
120
140
1200
Ø 95mm
90
45
60
120
135
1200
Ø 98mm
90
45
60
120
135
1200
Ø 102mm
85
40
55
110
130
1000
Ø 105mm
80
40
55
110
120
1000
Ø 108mm
80
40
55
110
120
900
Ø 111mm
80
40
50
100
120
900
Ø 114mm
75
35
50
100
105
900
Ø 121mm
70
35
45
95
95
900
Ø 127mm
65
30
45
90
90
800
Ø 133mm
65
30
45
90
90
800
Ø 140mm
60
25
40
85
85
800
Ø 146mm
60
25
40
85
85
800
Ø 152mm
55
25
35
75
75
800
consider
safety for your health and the people around you
General safety suggestions:
It is advisable to always have the following items nearby and in a good
condition
Eye protection – clean and scratch free
Hearing protection – quality earmuffs
Dust masks – discard old and dirty masks
Gloves – for easy handling of material and hand protection
Wear Gloves
Eye Protection
Hearing Protection
Dust Mask
IMPORTANT:
Tilting the drill or hitting a nail with the hole saw while drilling could cause
the hole saw to bind. The powerful torque could strain your wrist.
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