Surface feet per minute

Surface feet per minute

Surface feet per minute (SFM or SFPM) is a unit of velocity used in machining to identify the machinability ratings of a material.

SFM is the velocity around the tool or the material measured in feet-per-minute as the spindle of a lathe turns. The faster the spindle turns, the higher the SFM. The goal is to tool a job to run the SFM as high as possible to increase hourly part production. When SFM is known for a specific material ("ex 303 Stainless Steel = 120 SFM for High Speed Steel (HSS) Tooling"), a formula can be used to determine spindle speed for live tools or spindle speeds for turning materials.

Calculation

*Spindle Speed = SFM / .262 / Stock diameter
*SFM = Stock diameter(inches) * .262 * rpm (revolutions per minute)

Example: To find the Spindle Speed for a .625 Stainless Steel bar stock using HSS Tooling.:::120 SFM / .262 / .625 Dia = 732 Spindle Speed

(.262 is an approximation of π * 1/12).

Related Links

* [http://www.toddlertime.com/machining/feeds.htm Surface Feet per Minute]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Surface mining equipment —   An Auger machine is a large, horizontal drill, generally 3 feet or more in diameter and up to about 100 feet long. It can remove coal at a rate of more than 25 tons per minute.   A bucket wheel excavator is a continuous digging machine equipped …   Energy terms

  • sfm — surface feet per minute. * * * …   Universalium

  • sfm — • surface feet per minute …   Maritime acronyms and abbreviations

  • Speeds and feeds — A line drawing showing some basic concepts of speeds and feeds in the context of lathe work. The angular velocity of the workpiece (rev/min) is called the spindle speed by machinists. Its tangential linear equivalent at the tool cutter interface… …   Wikipedia

  • Machinist calculator — A machinist calculator is a hand held calculator programmed with built in formulas making it easy and quick for machinists to establish speeds, feeds and time without guesswork or conversion charts. Formulas may include revolutions per minute… …   Wikipedia

  • Milling cutter — Milling cutters are cutting tools typically used in milling machines or machining centres (and occasionally in other machine tools). They remove material by their movement within the machine (e.g., a ball nose mill) or directly from the cutter s… …   Wikipedia

  • FPM — may refer to: * Fellow Programme in Management * Fellowship of Postgraduate Medicine * [http://www.aafp.org/fpm Family Practice Management] , medical practice management journal published by American Academy of Family Physicians. *The Free… …   Wikipedia

  • SFM — abbreviation Usage: often not capitalized surface feet per minute * * * surface feet per minute …   Useful english dictionary

  • Cold saw — A 185 mm (7.3 in) hand held cold saw A cold saw bl …   Wikipedia

  • Polishing (metalworking) — Buffing redirects here. For the concept in cosmetics, see Nail buffing. Polishing and buffing are finishing processes for smoothing a workpiece s surface using an abrasive and a work wheel. Technically polishing refers to processes that use an… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”