TOPON TOOLS CO.,LTD

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TOPON TOOLS CO.,LTD.
Tel: 0086-571-87655659
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E-mail: SALES@TOPONTOOLS.COM
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Product Name：	Bi-Metal Hole Saws	Product categories：
Product descriptions ：

High speed steel Bi-metal Hole Saws are rugged cutting tools designed to cut accurate holes in machinable materials up to 1-3/8'', 35mm thick. Ranging in size form 9/16",14mm to 6'',152mm in diameter, they can be uses in portable electric, air tools, drill presses, lathes, boring mills, milling machines or any other machine which has a rotating spindle.

Hole Saws have 4/6 vari-pitch tooth design and are recommended for cutting steel and cast iron pipe, steel plates, aluminium, copper, brass, stainless steel, wood and plastics,Furnished in standard size as listed and in handy assortments.

IMPORTANT!

(r/min)

Dia.	Mild Steed	Stainless Steel	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	240	300	600	690	3000
20	435	230	290	580	660	3000
21	425	210	280	560	635	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	2400
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	315	360	2400
38	230	115	150	300	345	2400
40	220	110	145	290	330	2100
41	210	105	140	280	315	2100
43	205	100	135	270	305	2100
44	195	95	130	260	295	2100
46	190	95	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	160	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	60	120	140	1200
95	90	45	60	120	130	1200
98	90	45	60	120	135	1200
102	85	40	55	110	130	1000
105	80	40	55	110	120	1000
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	40	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

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.

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