Page 83 of Buckeye, Cleco, Dotco Fabrication Tools by Cooper Power Tools

conversion table torque ­ air pressure ­ miscellaneous torque conversion ­ in lbs nm in 5 10 15 20 25 30 35 40 45 nm 0.6 1.1 1.7 2.3 2.8 3.4 4.0 4.5 5.1 in 50 60 70 80 90 100 110 120 130 nm 5.7 6.8 7.9 9.0 10.2 11.3 12.4 13.6 14.7 in 140 150 160 170 180 190 200 nm 15.8 17.0 18.1 19.2 20.3 21.5 22.6 to convert inch pounds inch pounds inch pounds inch pounds foot pounds foot pounds foot pounds foot pounds newton meters newton meters newton meters newton meters torque conversion factors into foot pounds newton meters kg-meters kg-cm inch pounds newton meters kg-meters kg-cm inch pounds foot pounds kg-meters kg-cm inch pounds foot pounds newton-meters inch pounds foot pounds newton-meters mulitply by 0.0835 0.1130 0.0115 1.1519 12.000 1.3560 0.1382 13.8240 8.8440 0.7370 0.1020 10.2000 86.8100 7.2340 9.8040 0.8681 0.0723 0.0980 suggested surface speeds for high speed steel drills material alloy steels ­ 300 to 4000 brinell stainless steels ­ medium range automotive steel forgings and the like tool steels annealed ­ 90 to 1.20 carbon steels ­ .40 to .50 carbon steels ­ .20 to .30 carbon machinery steel hard chilled cast iron medium hard cast iron soft cast iron malleable iron monel metal high tensile strength bronze ordinary brass and bronze aluminum and its common alloys magnesium and its common alloys plastics ­ common types wood s.f.m 20-30 30-40 40-50 50-60 70-80 80-110 30-40 70-110 100-150 80-90 40-50 70-150 200-300 250-400 250-400 100-150 300-400 kg meters kg meters kg meters kg cm kg cm kg cm miscellaneous conversion factors to convert inches millimeters pounds kilograms psi bar into millimeters inches kilograms pounds bar psi mulitply by 25.4000 0.0394 0.4536 2.2050 0.069 14.5 air pressure conversion psi kpa 586 620 655 690 860 bar 5.9 6.2 6.6 6.9 8.6 carbon steel drills should be operated at 40%­50 of the above speeds these speeds indicate the approximate range under normal conditions for peak performance on individual jobs adjustments may be required to convert surface feet per minute sfm into revolutions per minutes rpm use the following formula rpm sfm x 3.82 diameter 85 90 95 100 125 example to drill 1/4 hole in aluminum 300 x 3.82 .250 4.584 rpm preferred approximate to the nearest 5 kpa approximate to the nearest 0.5 bar recommended tool cleco 111 do-50b drill diameter inches surface speed feet per minute 30 40 50 60 70 80 90 100 110 200 300 400 spindle speeds rpm 1/4 5/16 3/8 7/16 1/2 458 367 306 262 229 611 489 407 349 306 764 611 509 437 382 917 733 611 524 458 106=70 856 713 611 535 1222 976 815 698 611 1375 1100 917 786 688 1528 1222 1019 873 764 1681 1345 1120 960 840 3056 2445 2037 1746 1528 4584 3666 3056 2619 2282 6111 4888 4074 3492 3056 if there is a choice between tools of about the same speed but of different sizes final selection is made by preference for a lighter-weight tool or one with more power to maintain speed under load 81

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