King Sharp Tools Co.,Ltd

Operating Speed For Bi-metal hole saw

IMPORTANT!
For sale use of hole saws use the correct rotation speed. The correct speed for each size is given in the table. For longer saw life and lower operating costs, the following recommendation need to be observed:
1. Use the correct arbor for the size saw to be used.
2. Use pin-type arbors for hole saws larger than Dia.32. When mounting, Lift up the 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 turning the hole saw backwards. Push the pins in .Check that they are securely locked.
3. Check regularly to make sure the 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 aluminium.
6. Use the correct rotation speed! Too high or too low a speed will decrease the life of the cutting edge.
7. If the hole saw vibrates during sawing, the teeth may became damaged and break. The result is often a rough, imperfect hole.
8. Apply the hole saw perpendicular to the workpiece. 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 in order to prevent overheating.

Operating Speed For Bi-metal hole saws
Size/mm	Size/Inch	Mild Steel	Tool Stainles	Cast Iron	Brass	Aluminum	Wood
14	9/16"	580	300	400	790	900	3000
16	5/8"	550	275	365	730	825	3000
17	11/16"	500	250	330	665	750	3000
19	3/4"	460	240	300	600	690	3000
20	25/32"	435	230	290	580	660	3000
21	13/16"	425	210	280	560	635	3000
22	7/8"	390	195	260	520	585	3000
24	15/16"	370	185	245	495	555	3000
25	1"	350	175	235	470	525	2700
27	1-1/16"	325	160	215	435	480	2700
29	1-1/8"	300	150	200	400	450	2700
30	1-3/16"	285	145	190	380	425	2400
32	1-1/4"	275	140	180	360	410	2400
33	1-5/16"	260	135	175	345	390	2400
35	1-3/8"	250	125	165	330	375	2400
37	1-7/16"	240	120	160	315	360	2400
38	1-1/2"	230	115	150	300	345	2400
40	1-9/16"	220	110	145	290	330	2100
41	1-5/8"	210	105	140	280	315	2100
43	1-11/16"	205	100	135	270	305	2100
44	1-3/4"	195	95	130	260	295	2100
46	1-13/16"	190	95	125	250	285	2100
48	1-7/8"	180	90	120	240	270	2100
51	2"	170	85	115	230	255	2000
52	2-1/16"	165	80	110	220	245	2000
54	2-1/8"	160	80	105	210	240	2000
57	2-1/4"	150	75	100	200	225	2000
59	2-5/16"	145	75	100	195	225	2000
60	2-3/8"	140	70	95	190	220	2000
64	2-1/2"	135	65	90	180	205	1800
65	2-9/16"	130	65	85	175	200	1800
67	2-5/8"	130	65	85	170	195	1800
68	2-11/16"	130	65	85	170	195	1800
70	2-3/4"	125	60	80	160	185	1800
73	2-7/8"	120	60	80	160	180	1800
76	3"	115	55	75	150	170	1500
79	3-1/8"	110	55	70	140	165	1500
83	3-1/4"	105	50	70	140	155	1500
86	3-3/8"	100	50	65	130	150	1200
89	3-1/2"	95	45	65	130	145	1200
92	3-5/8"	95	45	60	120	140	1200
95	3-3/4"	90	45	60	120	130	1200
98	3-7/8"	90	45	60	120	135	1200
102	4"	85	40	55	110	130	1000
105	4-1/8"	80	40	55	110	120	1000
108	4-1/4"	80	40	55	110	120	900
111	4-3/8"	80	40	50	100	120	900
114	4-1/2"	75	35	50	100	105	900
121	4-3/4"	70	35	45	95	95	900
127	5"	65	30	40	90	90	800
133	5-1/4"	65	30	45	90	90	800
140	5-1/2"	60	25	40	85	85	800
146	5-3/4"	60	25	40	85	85	800
152	6"	55	25	35	75	75	800