Feeds & Speeds
RPM, feed rate, chip load, cutting speed, SFM, MRR and spindle calculations.
View CalculatorsTHE TRUE MACHINISTS
The True Machinists brings the machining calculators, resources, and tools a machinist requires to do the job effortlessly in a single place. Find the calculation or reference you need faster and get back to the work.
Common searchesFeeds & SpeedsChip LoadRPMTap Drill SizeSFMMRR
Quick Access
Core tools for everyday CNC and shop work.
Calculator Library
Choose a machining operation or calculation type and go straight to the tool.
RPM, feed rate, chip load, cutting speed, SFM, MRR and spindle calculations.
View CalculatorsEnd mills, stepover, stepdown, engagement, surface finish and milling calculations.
View CalculatorsTurning speed, feed, depth of cut, cycle time and parting calculations.
View CalculatorsDrill RPM, feed, hole size, peck drilling and drill point calculations.
View CalculatorsTap drill size, pitch, thread depth, TPI and clearance calculations.
View CalculatorsBolt circles, angles, arcs, radii, triangles and shop geometry.
View CalculatorsCycle time, machining cost, production rate and manufacturing calculations.
View CalculatorsMaterial weight, volume, density and stock calculations.
View CalculatorsLength, speed, feed, thread and engineering unit conversions.
View CalculatorsEveryday Use
Start with the tools most often used for spindle speed, feed, chip load, threading and production work.
Calculate spindle speed and feed rate from cutting speed, tool diameter, chip load and flute count.
Open CalculatorCalculate chip load per tooth from feed rate, RPM and flute count.
Open CalculatorCalculate spindle speed from cutting speed and tool diameter.
Open CalculatorCalculate milling feed rate from spindle speed, number of flutes and chip load.
Open CalculatorCalculate a basic metric tap drill size from nominal diameter and pitch.
Open CalculatorCalculate milling material removal rate from width of cut, depth of cut and feed rate.
Open CalculatorEstimate machining time from total toolpath length and feed rate.
Open CalculatorFeeds & Speeds
Use the core relationships between cutting speed, spindle RPM, feed rate, chip load and material removal. The calculator gives you the math. Your tooling, machine and process determine the final setup.
Check the unit beside every field before calculating. Use tooling manufacturer data and your machine limits when you move from a calculation to a production setting.
Reference
Quick lookup pages for dimensions, formulas, units and material information.
Metric and inch thread information with related tap and clearance tools.
Open Thread Charts →Fractional, letter, number and metric drill reference information.
Open Drill Charts →Core relationships used in feeds, speeds, geometry, time and production calculations.
View Formulas →Technical Guides
Clear explanations of the calculations and machining principles behind the tools.
Machining Guide
A practical overview of cutter, workholding, toolpath and cutting parameters.
Machining Guide
Key relationships between diameter, speed, feed and depth of cut.
Machining Guide
A practical reference for end mills, drills, turning tools and tool geometry.
Machining Guide
What changes when drilling compared with milling.
Machining Guide
Understand the basic metric tap drill relationship.
Machining Guide
A practical look at the feed, RPM and flute relationship.
Calculators, references, formulas and practical machining resources for everyday work.