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(Answer) Substitute n=500, I=120 into the formula. Metal Removal Rate. What is the feed per revolution when main axis spindle speed is 500min-1 and cutting length per minute is 120mm/min ? IPR : Formula: IPR = IPM ÷ RPM. If you are using carbide inserts for threading, cutting speed can be around 50 meters per minute. = Revolutions per Minute: S.M.M. Convert Inches Per Revolution (IPR) to Inches Per Minute (IPM) = IPR x RPM • Feed equals.001" per revolution for every 1/16" of drill diameter, plus or minus .001" on the total. What is the spindle feed (vf) when the feed per revolution is 0.2mm/rev and main axis spindle speed is 1350min-1? Speed and Feed Calculator for Miscellaneous Applications. = Feed per Revolution (in millimeters) MM.P.M. (Surface Meters Per Minute to SFM) SMPM x 3.2808399 . MRR =12 × DOC × Feed × SFM Milling Feed Rate Formulas. = Surface Meters per Minute: F.P.R. Speed – Surface Feet per Minute (SFM) Feed – Inches per Minute (IPM) Feed per Tooth (FPT) Adjusted Feed per Tooth – Chip Thinning (AFPT) Feed per Revolution (FPR) Depth of Cut (DOC) Width of Cut (WOC) Tool Diameter (D) # of Teeth in Cutter (Z) Metal Removal Rate – Cubic Inches per Minute (MRR) Constant (cubic inches per minute per HPc) R.P.M. （Answer） Substitute fr=0.2,n=1350 into the formula vf=fr×n=0.2×1350=270mm/min The spindle feed is 270mm/min. = Feed (travel in millimeters per Minute) F.P.T. The feed rate depends on the type of tool as well as on the power available on the spindle. This is measured in Inches Per Tooth (IPT). It is important to note that chip load per tooth and chip load per tool are different: Chip load per tooth is the appropriate amount of material that one cutting edge of the tool should remove in a single revolution. Enter IPM : Enter RPM : Reset. Online Drilling calculator helps to calculate inches per revolution (IPR) from IPM, RPM values. Feed Per Revolution (FPR) = IPM ÷ RPM. This value is a result of the cutter engagement as it is related to (f z), (a e), and (k r). These calculations are based upon theoretical values and are only intended for planning purposes. To calculate the feed rate, use a formula that includes different variables. Feed_Rate = Inches Per Minute or Millimeters Per Minute, Feed Rate, Distance in inches or millimeters the tool the will travel through work piece per minute. The other part of the equation is the chip load. N = Spindle speed in revolution per minute (rpm) V = Cutting speed in feet per minute (fpm) or (meter per minute (m/min) In turning operations, D is the diameter of the work piece; in milling, drilling, reaming, and other operations that use a rotating tool, D is the cutter diameter in inches for U.S. units and in millimeters for metric units. Inches Per Revolution Calculation. Feed is the rate at which the work moves into the cutter measured in feed per tooth revolution, and is expressed in units of distance per revolution. Maximum chip thickness, h ex. Feed Per Tooth (FPT) = IPM ÷ (RPM x T) Metric Conversion. N = Number of teeth on the cutter; CL= Chip Load per tooth, This is the advancement of the cutter per revolution per each cutting edge. Feed per revolution (f n) in mm/rev (inch/rev) is a value used specifically for feed calculations and often to determine the finishing capability of a cutter. So RPM = 1000 x Cutting speed ÷ (pi x diameter) = 1000 × 50 ÷ (3.14 × 42). In threading, Feed per revolution= pitch of the thread = 1.5 mm/ rev • Speed equals 80 surface feet per minute in 100 Brinell hardness material and the speed should be reduced 10 surface feet per minute for each additional 50 points Brinell hardness. = Feed per Tooth (in millimeters) HPc = Horsepower at the Cutter Inches Per Minute (IPM) = FPT x T x RPM.

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