Machinery's Handbook, 31st Edition
Reamers
909
Irregular Spacing of Teeth in Reamers
Number of Flutes in Reamer Index Circle to Use
4
6
8
10 39
12 39
14 49
16 20
39
39
39
Move Spindle the Number of Holes Below More or Less than for Regular Spacing
Before Cutting
2d flute 3d flute 4th flute 5th flute 6th flute 7th flute 8th flute 9th flute 10th flute 11th flute 12th flute 13th flute 14th flute 15th flute 16th flute
8 less
4 less
3 less
2 less
4 less
3 less
2 less
4 more 5 more 5 more 3 more 4 more 2 more 2 more
6 less
7 less
2 less
5 less
1 less
2 less
1 less
… …
6 more 4 more 2 more 3 more 4 more 2 more
5 less
6 less
2 less
4 less
1 less
2 less
… … … …
2 more 3 more 4 more 3 more 1 more
3 less
2 less
3 less
2 less
2 less
… … … … … …
5 more 2 more 1 more 2 more
1 less
2 less
3 less
2 less
… … … … … … … …
3 more 3 more 1 more
4 less
2 less
2 less
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2 more 2 more
3 less
1 less 2 more
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2 less Threaded-End Hand Reamers.— Hand reamers are sometimes provided with a thread at the extreme point in order to give them a uniform feed when reaming. The diameter on the top of this thread at the point of the reamer is slightly smaller than the reamer itself, and the thread tapers upward until it reaches a dimension of from 0.003 to 0.008 inch (0.076– 0.2 mm), according to size, below the size of the reamer; at this point, the thread stops and a short neck about 1 ⁄ 16 -inch (1.59 mm) wide separates the threaded portion from the actual reamer, which is provided with a short taper from 3 ⁄ 16 to 7 ⁄ 16 inch (4.76–11.1 mm) long up to where the standard diameter is reached. The length of the threaded portion and the number of threads per inch for reamers of this kind are given in the accompanying table. The thread employed is a sharp V-thread. Dimensions for Threaded-End Hand Reamers
Dia. of Thread at Point of Reamer Full diameter
Dia. of Thread at Point of Reamer Full diameter
Length of Threaded Part
No. of Threads per Inch
Length of Threaded Part
No. of Threads per Inch
Sizes of Reamers
Sizes of Reamers
32 28 24 18
18 18 18 18
1 ⁄ 8 - 5 ⁄ 16 11 ⁄ 32 - 1 ⁄ 2 17 ⁄ 32 - 3 ⁄ 4 25 ⁄ 32 -1
1 1 ⁄ 32 -1 1 ⁄ 2 1 17 ⁄ 32 -2 2 1 ⁄ 32 -2 1 ⁄ 2 2 17 ⁄ 32 -3
- 0.006 - 0.006 - 0.008 - 0.008
- 0.010 - 0.012 - 0.015
3 ⁄ 8
9 ⁄ 16 9 ⁄ 16 9 ⁄ 16 9 ⁄ 16
7 ⁄ 16
1 ⁄ 2
9 ⁄ 16 - 0.020 Fluted Chucking Reamers.— Reamers of this type are used in turret lathes, screw ma- chines, etc., for enlarging holes and finishing them smooth and to the required size. The best results are obtained with a floating type of holder that permits a reamer to align itself with the hole being reamed. These reamers are intended for removing a small amount of metal, 0.005 to 0.010 inch (0.127–0.25 mm) being common allowances. Fluted chucking reamers are provided either with a straight shank or a standard taper shank. (See table on page 910 for standard dimensions.)
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