The number of parts that can be cut by a broach tool before it needs resharpening depends on many factors. However, 2000 linear inches of cut in soft steel parts should be attainable with a broach tool made from PM-M4 high speed steel, prior to needing resharpening. Tool life estimates in other applications can be…

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Broach tools often perform best when ran between 10 and 30 feet per minute (sfm) cutting speed. This translates to 3 to 9 meters per minute, in the metric system. The cutting feed (cut per tooth) of a broach tool is fixed, established when the broach is manufactured.

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A water soluble cutting oil mixed at a manufacturer’s recommended concentration (often 10-12%) is the best coolant for a broaching application. In some applications, a straight cutting oil provides a better surface finish, but has less heat capacity. Broaching applications usually require a cutting fluid designed for heavy duty machining applications. Often, a cutting fluid…

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