A-A-51152A
TABLE III. Number of teeth per circumference, type I rotary files.
Cutter head diameter (inches) |
Number of teeth |
||
Class A (coarse) |
Class B (medium) |
Class C (fine) |
|
1/8 |
6 - 8 |
9 - 11 |
12 - 15 |
3/16 |
9 - 11 |
12 - 14 |
15 - 20 |
1/4 |
10 - 13 |
14 - 16 |
17 - 21 |
5/16 |
11 - 16 |
17 - 20 |
21 - 26 |
3/8 |
12 - 17 |
18 - 22 |
23 - 30 |
7/16 |
13 - 18 |
19 - 23 |
24 - 31 |
1/2 |
14 - 20 |
21 - 26 |
27 - 35 |
5/8 |
17 - 22 |
23 - 29 |
30 - 40 |
3/4 |
18 - 24 |
25 - 32 |
33 - 44 |
7/8 |
19 - 25 |
26 - 33 |
34 - 45 |
1 |
20 - 27 |
28 - 41 |
42 - 55 |
TABLE IV. Number of teeth per circumference, type II rotary files.
Cutter head diameter (inches) |
Number of teeth |
||
Class A (coarse) |
Class B (medium) |
Class C (fine) |
|
1/8 |
8 - 11 |
12 - 15 |
16 - 20 |
3/16 |
10 - 12 |
13 - 16 |
17 - 24 |
1/4 |
12 - 15 |
16 - 20 |
21 - 26 |
5/16 |
13 - 16 |
17 - 22 |
23 - 30 |
3/8 |
13 - 18 |
19 - 26 |
27 - 38 |
7/16 |
15 - 20 |
21 - 27 |
28 - 36 |
1/2 |
16 - 22 |
23 - 28 |
29 - 39 |
5/8 |
18 - 25 |
26 - 28 |
39 - 47 |
3/4 |
19 - 28 |
29 - 38 |
39 - 49 |
7/8 |
22 - 29 |
30 - 37 |
38 - 55 |
1 |
24 - 32 |
33 - 43 |
44 - 62 |
3.6 Fluting. The fluting of the rotary file shall be either right hand spiral, right hand spiral with chipbreaker, double cut, or diamond cut, depending upon the style specified. The fluting shall create a cutting tooth pattern that extends along the entire periphery of the cutting head.
3.6.1 Style A fluting. The style A rotary file shall have right hand spiral fluting consisting of a standard commercial right hand helix. The helix angle, measured from the centerline of the cutter head, shall be not less than 15 degrees and not greater than 35 degrees.
3.6.2 Style B fluting. The style B rotary file shall have right hand spiral fluting with chipbreaker consisting of standard right hand spiral fluting with an additional series of slight serrations along the periphery of the cutting teeth that serve to break up the formation of long chips.
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