Page:Practical Treatise on Milling and Milling Machines.djvu/333

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Brown & Sharpe Mfg. Co.
327


TABLE OF CUTTING SPEEDS


FT. Per
Minute
15 17.5 20 22.5 25 27.5 30 35 40 45 50 55
Diam. REVOLUTIONS PER MINUTE
116 917   1070   1222   1375   1528   1681   1833   2139   2445   2750   3056   3361  
18 458   535   611   688   764   840   917   1070   1222   1375   1528   1681  
316 306   357   407   458   509   560   611   713   815   917   1019   1120  
14 229   267   306   344   382   420   458   535   611   688   764   840  
516 183   214   244   275   306   336   367   428   489   550   611   672  
38 153   178   204   229   255   280   306   357   407   458   509   560  
716 131   153   175   196   218   240   262   306   349   393   437   480  
12 115   134   153   172   191   210   229   267   306   344   382   420  
58 91.7 107   122   138   153   168   183   214   244   275   306   336  
34 76.4 89.1 102   115   127   140   153   178   204   229   255   280  
78 65.5 76.4 87.3 98.2 109   120   131   153   175   196   218   240  
1 57.3 66.8 76.4 85.9 95.5 105   115   134   153   172   191   210  
1+18 50.9 59.4 67.9 76.4 84.9 93.4 102   119   136   153   170   187  
1 1/4 45.8 53.5 61.1 68.8 76.4 84.0 91.7 107   122   138   153   168  
1+38 41.7 48.6 55.6 62.5 69.5 76.4 83.3 97.2 111   125   139   153  
1+12 38.2 44.6 50.9 57.3 63.7 70.0 76.4 89.1 102   115   127   140  
1+58 35.3 41.1 47.0 52.9 58.8 64.6 70.5 82.3 94.0 106   118   129  
1+34 32.7 38.2 43.7 49.1 54.6 60.0 65.5 76.4 87.3 98.2 109   120  
1+78 30.6 35.7 40.7 45.8 50.9 56.0 61.1 71.3 81.5 91.7 102   112  
2 28.7 33.4 38.2 43.0 47.7 52.5 57.3 66.8 76.4 85.9 95.5 105  
2+14 25.5 29.7 34.0 38.2 42.4 46.7 50.9 59.4 67.9 76.4 84.9 93.4
2+12 22.9 26.7 30.6 34.4 38.2 42.0 45.8 53.5 61.1 68.8 76.4 84.0
2+34 20.8 24.3 27.8 31.3 34.7 38.2 41.7 48.6 55.6 62.5 69.5 76.4
3 19.1 22.3 25.5 28.6 31.8 35.0 38.2 44.6 50.9 57.3 63.7 70.0
3+14 17.6 20.6 23.5 26.4 29.4 32.3 35.3 41.1 47.0 52.9 58.8 64.6
3+12 16.4 19.1 21.8 24.5 27.3 30.0 32.7 38.2 43.7 49.1 54.6 60.0
3+34 15.3 17.8 20.4 22.9 25.5 28.0 30.6 35.7 40.7 45.8 50.9 56.0
4 14.3 16.7 19.1 21.5 23.9 26.3 28.7 33.4 38.2 43.0 47.7 52.5
4+12 12.7 14.9 17.0 19.1 21.2 23.3 25.5 29.7 34.0 38.2 42.4 46.7
5 11.5 13.4 15.3 17.2 19.1 21.0 22.9 26.7 30.6 34.4 38.2 42.0
5+12 10.4 12.2 13.9 15.6 17.4 19.1 20.8 24.3 27.8 31.3 34.7 38.2
6 9.5 11.1 12.7 14.3 15.9 17.5 19.1 22.3 25.5 28.6 31.8 35.0
6+12 8.8 10.3 11.8 13.2 14.7 16.2 17.6 20.6 23.5 26.4 29.4 32.3
7 8.2 9.5 10.9 12.3 13.6 15.0 16.4 19.1 21.8 24.5 27.3 30.0
7+12 7.6 8.9 10.2 11.5 12.7 14.0 15.3 17.8 20.4 22.9 25.5 28.0
8 7.2 8.4 9.5 10.7 11.9 13.1 14.3 16.7 19.1 21.5 23.9 26.3
8+12 6.7 7.9 9.0 10.1 11.2 12.4 13.5 15.7 18.0 20.2 22.5 24.7
9 6.4 7.4 8.5 9.5 10.6 11.7 12.7 14.9 17.0 19.1 21.2 23.3
9+12 6.0 7.0 8.0 9.1 10.1 11.1 12.1 14.1 16.1 18.1 20.1 22.1
10 5.7 6.7 7.6 8.6 9.5 10.5 11.5 13.4 15.3 17.2 19.1 21.0
11 5.2 6.1 6.9 7.8 8.7 9.5 10.5 11.5 13.4 15.3 17.2 19.1
12 4.8 5.6 6.4 7.2 8.0 8.8 9.5 11.1 12.7 14.3 15.9 17.5
13 4.4 5.1 5.9 6.6 7.3 8.1 8.8 10.3 11.8 13.2 14.7 16.2
14 4.1 4.8 5.5 6.1 6.8 7.5 8.2 9.5 10.9 12.3 13.6 15.0
15 3.8 4.5 5.1 5.7 6.4 7.0 7.6 8.9 10.2 11.5 12.7 14.0
16 3.6 4.2 4.8 5.4 6.0 6.6 7.2 8.4 9.5 10.7 11.9 13.1
17 3.4 3.9 4.5 5.1 5.6 6.2 6.7 7.9 9.0 10.1 11.2 12.4
18 3.2 3.7 4.2 4.8 5.3 5.8 6.4 7.4 8.5 9.5 10.6 11.7
  15 17.5 20 22.5 25 27.5 30 35 40 45 50 55