0005 001 003 004 004 006 002 003 004 006 Plastics Much Variation 002 004 005

0005 001 003 004 004 006 002 003 004 006 plastics

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.0005-.001 .003-.004 .004-.006 .002-.003 .004-.006 Plastics * Much Variation .002 .004 .005 .003 .008 *Variation in Feed-per-Tooth exists with different Material Alloy Harness, Tool Qualities, Cutting Techniques and Desired Finishes. Contact the manufacturer if precision is important. Twist Drill Feeds (Feed per Revolution) Drill Size Inches Drill Feed Inches Drill Size Metric Drill Feed Millimeter 1/8" and smaller 0.001" to 0.002 3mm and smaller .02mm to 0.05mm 1/8" to 1/4" 0.002" to 0.004" 3mm to 6mm 0.05mm to 0.10mm 1/4" to 1/2" 0.004" to 0.007" 6mm to 13mm 0.05mm to 0.10mm 1/2" to 1" 0.007" to 0.015" 13mm to 25mm 0.18mm to 0.38mm 1 to 1 1/2" 0.015 to 0.025" 25mm to 38mm 0.38mm to 0.63mm
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Quick RPM/Spindle Rate Calculations: Lathe, Mill, Drill (HSS Cutter) (RPM changes with Cutting Speed & Diameter) Material 1/4" Dia 1/2" Dia 1" Dia 1 1/2" Dia 2" Dia Low-Carbon Steel 1600 RPM 800 RPM 400 RPM 267 RPM 200 RPM High-Carbon Steel 960 480 240 160 120 Aluminum 4000 2000 1000 667 500 Brass & Bronze 3200 1600 800 533 400 * RPM Spindle Speed Examples calculated using Ballpark Cutting Speeds with High- Speed Steel cutting tools Calculating RPM Lathes, Milling Machines, Drills RPM (Turning Spindle Speed) of the cutting tool or work piece is calculated as follows: RPM (LATHES) = (Cutting Speed x 4)/Diameter MILLING AND DRILLING: MULTIPLY BY .75 RPM = Spindle Speed Cutting Speed = Cutting Speed for the material being cut/worked. Diameter = The Diameter of whatever is turning. Example #1 Calculate RPM for TURNING a 1 inch diameter piece of Low-Carbon Steel with a Cutting Speed of 100 on a Lathe. (Double-check CS table) RPM = (100 x 4)/1 = 400 RPM Example #2 Calculate RPM (Spindle Speed) for a 1/2 inch High-Speed-Steel 2 Flute End-Mill cutting Aluminum with a CS of 250 on a Milling Machine RPM = (250 x 4)/.5 = 2000 RPM Milling and Drilling: RPM X .75 Therefore: 2000 x .75 = 1500 RPM
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Calculating Feed Rates Link: Machine Shop Feed Rates Explained Milling & Drilling The Feed Rate in "INCHES Per MINUTE" is determined by multiplying the number of cutting teeth by the RPM, multiplying that product by the Feed per Tooth, and dividing by 3. The calculation is as follows:
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  • Winter '16
  • Jan duffy

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