For sale use of Hole Saws use fhe correct rotation speed.The correct speed for each size is given in the table．
For longer saw Iife and lower operating costs．the following recommendations need to be ob-served.
       1. Use the correct arbor for the size saw to the used．
       2．Use pin-type arbor for Hole Saws larger Than Φ32 . When mounting,lift up fhe disc with the pins and then screw the arbor down into the hole saw as far as it will go．Fit the drive pins into the pin holes in the hole saw by turn-ing the hole save backwards Push the pins in. Check that they are securely Iocked．
      3 . Check regularly to make sure fhe drive pins are in the right position．
      4．Check that the arbor shank is securely inserted in the chuck on the drive unit Tighten with chuck key．
       5．Cutting oil should be used when sawing Steel. Do not use cutting oil when sawing cast Iron. The cutting pressure should，however，be high so that each tooth cuts deep. Paraffin can be used when sawing aluminum
       6．Use the correct rotation speed!Too high or too Iow a speed will decrease the life of the cutting edge．
      7 lf lhe hole saw vibrates during sawing，the teeth may become damaged and break. The result is often a rough．imperfect hole．
      8．Apply the Hole Saw perpendicular to the work piece. If the Hole Saw is titled, this will cause uneven loading and abnormal wear on both the saw teeth and the grilling machine．Moreover, the dimensional accuracy of the Hole saw can be affected．
      9. Clear away chips and slugs frequently Inorder to prevent overheating． 		 
CAUTION
Operating Speeds And Important
                                                                                            (r/min)
Dia.
Mild Steel
Stainless Steels
Cast Iron
Brass
Aluminum Wood
14
580
300
400
790
900 3000
16
550
275
365
730
825 3000
17
500
250
330
665
750 3000
19
460
230
300
600
690 3000
20
435
240
290
580
660 3000
21
425
210
280
56
365 3000
22
390
195
260
520
585 3000
24
370
185
245
495
555 3000
25
350
175
235
470
525 2700
27
325
160
215
435
480 2700
29
300
150
200
400
450 2700
30
285
145
190
380
425 2700
32
275
140
180
360
410 2400
33
260
135
175
345
390 2400
35
250
125
165
330
375 2400
37
240
120
160
345
360 2700
38
230
115
150
300
345 2700
40
220
110
145
290
330 2100
41
210
105
140
280
315 2100
43
205
10
135
270
305 2100
44
195
95
130
260
295 2100
46
190
945
125
250
285 2100
48
180
90
120
240
270 2100
51
170
85
115
230
255 2000
52
165
80
110
220
245 2000
54
165
80
105
210
240 2000
57
150
75
100
200
225 2000
59
145
75
100
195
225 2000
60
140
70
95
190
220 2000
64
135
65
90
180
205 1800
65
130
65
85
175
200 1800
67
130
65
85
170
195 1800
68
130
65
85
170
195 1800
70
125
60
80
160
185 1800
73
120
60
80
160
180 1800
76
115
55
75
150
170 1500
79
110
55
70
140
165 1500
83
105
50
70
140
155 1500
86
100
50
65
130
150 1200
89
95
45
65
130
145 1200
92
95
45
0
120
140 1200
95
90
45
60
120
135 1200
98
90
45
60
120
135 1200
102
85
40
55
110
130 1000
105
80
40
55
110
120 900
108
80
40
55
110
120 900
111
80
40
50
100
120 900
114
75
35
50
100
105 900
121
70
35
45
95
95 900
127
65
30
45
90
90 800
133
65
30
45
90
90 800
140
60
25
40
85
85 800
146
60
25
40
85
85 800
152
55
25
35
75
75 800