# The True Machinists

> Machining Calculators, Resources & Tools


## Posts

- [Material Removal Rate: How CNC MRR Is Calculated](https://truemachinists.com/cnc-material-removal-rate-explained/): How width of cut, depth of cut and feed rate combine to describe material removal. This practical guide explains the calculation, the variables that matter and the checks to complete
- [CNC Drilling Feed and Speed Basics](https://truemachinists.com/cnc-drilling-feed-speed-basics/): How drill diameter, cutting speed, feed per revolution and hole depth work together. This practical guide explains the calculation, the variables that matter and the checks to complete before using
- [How to Reduce CNC Tool Deflection](https://truemachinists.com/cnc-tool-deflection-reduction/): How stickout, diameter, cutting load and setup rigidity affect deflection. This practical guide explains the calculation, the variables that matter and the checks to complete before using a value in
- [CNC Surface Finish: Ra, Rz and What Affects the Result](https://truemachinists.com/surface-finish-rz-ra-cnc/): How ra and rz describe surface texture and what machining variables influence finish. This practical guide explains the calculation, the variables that matter and the checks to complete before using
- [How to Select a Tap Drill Size](https://truemachinists.com/tap-drill-size-selection/): How thread standard, pitch and target percentage of thread affect drill selection. This practical guide explains the calculation, the variables that matter and the checks to complete before using a
- [How to Calculate CNC Cycle Time](https://truemachinists.com/cnc-cycle-time-calculation/): How to estimate cutting time, account for non-cutting moves and separate setup from cycle time. This practical guide explains the calculation, the variables that matter and the checks to complete
- [What Is Chip Thinning in CNC Milling?](https://truemachinists.com/what-is-chip-thinning-in-cnc-milling/): Why light radial engagement changes effective chip thickness. This practical guide explains the calculation, the variables that matter and the checks to complete before using a value in a CNC
- [CNC Milling Feeds and Speeds for Aluminum: What to Check](https://truemachinists.com/cnc-milling-speeds-feeds-aluminum/): The variables that matter when machining aluminum with end mills. This practical guide explains the calculation, the variables that matter and the checks to complete before using a value in
- [How to Choose CNC Feeds and Speeds for a New Job](https://truemachinists.com/how-to-choose-cnc-feeds-speeds/): A practical step-by-step process for selecting starting values before a machining trial. This practical guide explains the calculation, the variables that matter and the checks to complete before using a
- [Metric and Inch Machining Units](https://truemachinists.com/metric-and-inch-machining-units/): How to keep dimensions, feed rates, speeds and thread values consistent when units change. This practical guide explains the calculation, the variables that matter and the checks to complete before
- [Drilling Feed Basics](https://truemachinists.com/drilling-feed-basics/): How drill rpm, feed per revolution and feed rate work together. This practical guide explains the calculation, the variables that matter and the checks to complete before using a value
- [Turning Feed per Revolution Explained](https://truemachinists.com/turning-feed-per-revolution/): How feed per revolution is used in cnc turning and how it relates to feed rate. This practical guide explains the calculation, the variables that matter and the checks to
- [Milling Stepover and Surface Finish](https://truemachinists.com/milling-stepover-and-surface-finish/): How radial engagement changes scallop height, cutting load and finish. This practical guide explains the calculation, the variables that matter and the checks to complete before using a value in
- [Why Chip Load Matters](https://truemachinists.com/why-chip-load-matters/): How chip load connects spindle speed, feed rate and flute count. This practical guide explains the calculation, the variables that matter and the checks to complete before using a value
- [CNC Feeds & Speeds: Where to Start](https://truemachinists.com/cnc-feeds-speeds-starting-point/): How to choose starting cutting data for a cnc milling job. This practical guide explains the calculation, the variables that matter and the checks to complete before using a value
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## Pages

- [Feed & Speed Calculator](https://truemachinists.com/feed-and-speed-calculator/): Feed and speed calculator for CNC milling. Calculate spindle RPM and feed rate from cutting speed, tool diameter, flute count and chip load, with formulas, material references and related machining tools.
- [Advertising & Partnerships](https://truemachinists.com/advertise/): The True Machinists may offer advertising, sponsorship and relevant industry partnerships as the platform grows.Relevant placementsCommercial placements should be relevant to machining, manufacturing, engineering software, tooling, equipment orThe True Machinists may offer
- [Affiliate Disclosure](https://truemachinists.com/affiliate-disclosure/): The True Machinists may use affiliate links or commercial partnerships for products, tools, software or services relevant to machining and manufacturing. A commercial relationship does not change theThe True Machinists may use
- [Corrections Policy](https://truemachinists.com/corrections-policy/): Accuracy matters because users may rely on a calculator or reference page while preparing real work. We treat formula, unit, label, example and factual reference issues as technicalAccuracy matters because users may
- [Editorial Policy](https://truemachinists.com/editorial-policy/): The True Machinists publishes calculators, technical references and practical machining explanations. The purpose of the content is to help users understand a calculation or reference value and applyThe True Machinists publishes calculators,
- [Accessibility](https://truemachinists.com/accessibility/): The True Machinists aims to make the site usable across common desktop and mobile devices. We focus on readable contrast, logical navigation, clear labels, keyboard-friendly controls and textThe True Machinists aims to
- [Advertising & Analytics](https://truemachinists.com/advertising-analytics/): The True Machinists may use analytics and advertising services to operate, improve and support the website. The exact providers and configuration may change as the site develops.AnalyticsAnalytics mayThe True Machinists may use
- [Resources](https://truemachinists.com/resources/): The True Machinists brings calculators, reference material, guides and machining notes into one place so you can move from a calculation to the information behind it without starting
- [Material Density](https://truemachinists.com/reference/material-density/): Material density is useful for stock weight and volume calculations. Values below are approximate reference figures, not a replacement for grade specific material documentation. Material Density The reference is designed for quick
- [Unit Conversions](https://truemachinists.com/reference/unit-conversions/): Unit conversion errors are easy to make because many machining tables use different unit systems. Keep the unit beside every input and convert before applying a formula. Unit Conversions The reference is
- [Machining Formulas](https://truemachinists.com/reference/machining-formulas/): This page collects the core relationships behind the calculator library. The formulas are shown so the user can audit the result rather than treating the calculator as a black box. Machining Formulas
- [Drill Charts](https://truemachinists.com/reference/drill-charts/): Drill size references help when converting between metric and inch stock, checking a drawing or selecting a starting drill for a hole. Drill Charts The reference is designed for quick lookup. Keep
- [Thread Charts](https://truemachinists.com/reference/thread-charts/): Thread charts are useful for quick setup reference, but the correct hole size depends on the thread standard, tolerance class, material and required thread percentage. Thread Charts The reference is designed for
- [Cookie Policy](https://truemachinists.com/cookie-policy/): The True Machinists may use cookies and similar technologies to support essential site functions, understand how pages are used and support advertising when those services are enabled.Essential cookiesSomeThe True Machinists may use
- [Calculator & Content Disclaimer](https://truemachinists.com/disclaimer/): The calculators and technical material on The True Machinists are provided for general informational and calculation purposes. A calculated result is not a production approval, engineering certification, machiningThe calculators and technical material
- [Terms of Use](https://truemachinists.com/terms/): The True Machinists provides calculators, reference information, guides and articles for general technical use. By using the site, you agree to use it lawfully and to review theThe True Machinists provides calculators,
- [Contact](https://truemachinists.com/contact/): Send a calculator correction, suggest a new tool or share technical feedback about The True Machinists. Technical feedback For a formula or result issue, include the calculator name,
- [About The True Machinists](https://truemachinists.com/about/): The True Machinists brings the machining calculators, resources and tools a machinist requires to do the job in one place. The purpose is practical: spend less time searching
- [Machining News & Notes](https://truemachinists.com/blog/): CNC machining news, technical notes and practical articles on feeds, speeds, tooling, materials and shop calculations.
- [Machining Guides](https://truemachinists.com/guides/): Practical explanations of machining formulas, cutting parameters, tooling and everyday shop calculations. Learn the relationship behind the result A calculator is easier to trust when the formula is
- [Machining Reference](https://truemachinists.com/reference/): Quick reference pages for the dimensions, formulas and conversions used in everyday machining work. Reference material that stays close to the calculation Reference pages are useful when you
- [Materials](https://truemachinists.com/materials/): Material reference pages, basic properties and related calculators for common engineering materials used in machining. Material information for real shop work Material names are often broad. A grade,
- [Converters Calculators](https://truemachinists.com/calculators/converters/): Length, speed, feed, thread and engineering unit conversions.
- [Materials Calculators](https://truemachinists.com/calculators/materials/): Material weight, volume, density and stock calculations.
- [Manufacturing Calculators](https://truemachinists.com/calculators/manufacturing/): Cycle time, machining cost, production rate and manufacturing calculations.
- [Geometry Calculators](https://truemachinists.com/calculators/geometry/): Bolt circles, angles, arcs, radii, triangles and shop geometry.
- [Threading Calculators](https://truemachinists.com/calculators/threading/): Tap drill size, pitch, thread depth, TPI and clearance calculations.
- [Drilling Calculators](https://truemachinists.com/calculators/drilling/): Drill RPM, feed, hole size, peck drilling and drill point calculations.
- [Turning Calculators](https://truemachinists.com/calculators/turning/): Turning speed, feed, depth of cut, cycle time and parting calculations.
- [Milling Calculators](https://truemachinists.com/calculators/milling/): End mills, stepover, stepdown, engagement, surface finish and milling calculations.
- [Feeds & Speeds Calculators](https://truemachinists.com/calculators/feeds-speeds/): RPM, feed rate, chip load, cutting speed, SFM, MRR and spindle calculations.
- [Machining Calculators](https://truemachinists.com/calculators/): A complete working library of machining calculators for feeds and speeds, milling, turning, drilling, threading, geometry, manufacturing, materials and unit conversion. Each tool is built around a defined
- [Home](https://truemachinists.com/)
- [Privacy Policy](https://truemachinists.com/privacy-policy/): The True Machinists respects your privacy. This page explains what information may be processed when you visit the website, use a calculator, submit a message or interact withThe True Machinists respects your

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