"Feet per minute" redirects here. For the vertical speed unit, see Rate of climb.
Surface feet per minute (SFPM or SFM) is the combination of a physical quantity (surface speed) and an imperial and American customary unit (feet per minute or FPM). It is defined as the number of linear feet that a location on a rotating component travels in one minute. Its most common use is in the measurement of cutting speed (surface speed) in machining. It is a unit of velocity that describes how fast the cutting edge of the cutting tool travels. It correlates directly to the machinability of the workpiece material and the hardness of the cutting tool material. It relates to spindle speed via variables such as cutter diameter (for rotating cutters) or workpiece diameter (for lathe work).
SFM is a combination of diameter and the velocity (RPM) of the material measured in feet-per-minute as the spindle of a milling machine or lathe. 1 SFM equals 0.00508 surface meter per second (meter per second, or m/s, is the SI unit of speed). The faster the spindle turns, and/or the larger the diameter, the higher the SFM. The goal is to tool a job to run the SFM as high as possible to increase hourly part production. However some materials will run better at specific SFMs. When the SFM is known for a specific material (ex 303 annealed stainless steel = 120 SFM for high speed steel tooling), a formula can be used to determine spindle speed for live tools or spindle speeds for turning materials.
In a milling machine, the tool diameter is used instead of the stock diameter in the following formulas when the tool is revolving and the stock is stationary.
Spindle speed can be calculated using the following equation:
[1]
SFM can be calculated using the following equation:
of distance across the workpiece surfaceper unit of time, typically surfacefeetperminute (sfm) or meters perminute (m/min). Feed rate (also often styled...
Formulas may include revolutions perminute (RPM), surfacefeetperminute (SFM), inches perminute (IPM), feed per tooth (FPT). A cut time (CT) function...
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case, the grinding wheel must have adequate surface velocity, at least 23 m/s (4500 surfacefeetperminute (sfpm)), but should be between 38 and 58 m/s...
"feed". It is specified as mm per revolution (mm/rev). Diamond turning Engine turning Hard turning Surfacefeetperminute Woodturning Todd, Robert H.;...
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less than 5000 surfacefeetperminute (SFM) (25 m/s), and a high chip load per tooth, usually between .001"–.003" (0.025–0.08 mm) per tooth. These blades...
tool spins. This is measured either in metres per minute in metric countries, or surfacefeetperminute (SFM) in America. Typical values for cutting speed...
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aerospace industries. They are ideal for speed machining (9000 surfacefeetperminute or higher) in tough and abrasive aluminum alloys, and high-abrasion...
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one minute of arc, from a distance of twenty feet. A 20/20 letter subtends 5 minutes of arc total. The deviation from parallelism between two surfaces, for...
aeration diffuses approximately 2–4 cfm (cubic feet of air perminute) (56.6-113.3 liters of air perminute), but some operate at levels as low as 1 cfm...
rated in actual cubic feetperminute (ACFM).[clarification needed][citation needed] Still others are rated in cubic feetperminute (CFM).[clarification...
purposes today, one minute of latitude at the WGS84 equator is 6,046 feet and at the poles is 6,107.5 feet. The average is about 6,076 feet (about 1,852 metres...
a 72-foot-6-inch (22.1 m) diameter, is 6 feet (1.8 m) wide and revolves approximately three times perminute. The wheel was built in 1854 to pump water...
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curing (almost instantly) at speeds ranging from 100 feetperminute to over 800 feetperminute so the faster production speeds provide greater opportunity...
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A road surface (British English) or pavement (North American English) is the durable surface material laid down on an area intended to sustain vehicular...
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