EML2322L-Drilling Speeds and Feeds

EML2322L-Drilling Speeds and Feeds - EML 2322L - MAE Design...

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EML 2322L -- MAE Design and Manufacturing Laboratory Drilling Speeds and Feeds The speed of a drill is usually measured in terms of the rate at which the outside or periphery of the tool moves in relation to the work being drilled. The common term for this is "surface feet per minute", abbreviated as sfm. Every tool manufacturer has a recommended table of sfm values for their tools. General sfm guidelines are commonly found in resources such as the Machinery Handbook (see Table 1 in this document). The peripheral and rotational velocities of the tool are related as shown in the following equation: V = π * D * N (Eq. 1) where V is the recommended peripheral velocity for the tool being used D is the diameter of the tool N is the rotational velocity of the tool Since the peripheral velocity is commonly expressed in units of feet/min and tool diameter is typically measured in units of inches, Equation 1 can be solved for the spindle or tool velocity, N in the following manner: N [rpm] = 12 [in/ft] * V [sfm] / ( π * D [in]) (Eq. 2) Equation 2 will provide a guideline as to the maximum rpm when drilling standard materials. The optimum speed for a particular setup is affected by many factors, including the following: Composition & hardness of material Depth of hole Efficiency of cutting fluid Type, condition and stiffness of drilling machine Stiffness of workpiece, fixture and tooling (shorter is better) Quality of holes desired Life of tool before regrind or replacement
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Table 2 contains recommended feeds for various drill diameters.
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This note was uploaded on 11/19/2010 for the course EML 2322l taught by Professor Staff during the Spring '08 term at University of Florida.

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EML2322L-Drilling Speeds and Feeds - EML 2322L - MAE Design...

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