What do the following mean SFM SFPM Cutting speed Feed Feed

What do the following mean? SFM (SFPM); Cutting speed: Feed; Feed rate

Solution

Surface feet per minute

Surface feet per minute (SFPM or SFM) . It is defined as the number of linear feet that a location on a rotating component travels in one minute.

FEED(f);The linear distance travelled for one revolution of the workpiece along the length of tool is called feed(mm/min)

For example, in turning oparation on a lathe it is equal to the advancement of a ool corresponding to each revolution of work.

FEED RATE : The velocity with which the tool is traveling along the workpiece=fN=(mm/min)

CUTTING SPEED: Cutting speed of a tool can be defined as a rate at which its cutting edge passes over sirface of the workk piece in unit time.

If it is too high, tool gets over heated and cutting edge may fail.

If it is too low, too much time is cunsumed in machining and full cutting capacities of tool and machine not utilized. So that production rate is decreased.