Do you refer to Machinery's Handbook a lot for the quick reference charts? Do you use online Calculators of various kinds to figure out your machining problems?
I used to, but then I got tired of leafing through thick handbooks and trying to find things on the web at the last minute. Yes, they're great resources, but I wanted things to be a lot closer to my fingertips. I wanted a higher concentration of useful tools. In fact, what I wanted and needed was a cnc machinist calculator.
To make that happen, I started building what would eventually become this page. I hope you get as much use out of all these free resources as I have.
Bolt Circle Calculator: Generate the coordinates for bolt circle patterns quickly and easily with this handy free machinist calc.
Feeds and Speeds Calculator
CNC Feeds and Speeds Calculator: Get the spindle speed and feed calculations done quickly and easily. This is the most important part of any good cnc machinist calculator app-you won't get far without speeds and feeds!
Machine Hourly Rate Calculator
CNC Machine Hourly Rate Calculator: Figure out what hourly rate to charge for your CNC machines.
Drill Bit Tap and Size Chart and Calculator
Drill Bit Tap and Size Chart and Calculator: A full drill index, recommended tap drill sizes, thread percentages vs strength, free fit drill sizes, and more!
Feed Rate Calculator
Feed Rate Calculator: One of the best free milling calculators for feed rates. Includes a chart of materials and tool settings
G-code and M-code Reference
G-code and M-code Reference: Need a handy reference chart for all the G-codes?. Look no further. CNC Programmers will appreciate charts for Milling G-codes List and Turning G-codes. Also Milling M-codes and Turning M-codes. And, there are Tutorials and Sample data from our Free G-code Tutorial too!
GD&T Symbols Chart and Calculator
GD&T Symbols: Geometric Dimensioning and Tolerancing Symbols in a convenient chart with tutorial information on the symbols from our Free GD&T Course too!
We also have a free True Position Calculator.
Hardness Conversion Charts
Hardness Conversion Charts: Hardness Conversion Charts, Free Calculator, and information for Rockwell, Vickers, Brinell, Shore Scleroscope, and more Hardness Scales.
Lumber Sizes
Lumber Sizes: Ever notice a 2 x 4 doesn't measure 2 by 4 inches? Here's the scoop on the actual sizes for lumber, despite what we call it. There's even a free calculator for weights and volumes based on the actual sizes.
Polar to Rectangular Calculator
Polar Coordinates Calculator: Convert from Polar to Rectangular (Cartesian) Coordinates easily.
Handy to have when you're programming in polar coordinates. Just the sort of thing you would want to find built in to your CNC Machinist Calculator!
Sheet Metal Wire Gauge Sizes
Sheet Metal Wire Gauge Sizes Chart / Table and Calculator: Sheet metal gauging is somewhat arbitrary, but we've got full reference charts plus a nifty free calculator to help right here.
Steel I-Beam, Channel, and Angle Sizes
Steel I-Beam, Channel, and Angle Sizes: Complete Guide to Standard Sizes for Steel I-Beams, HSS, Channel, and Angle.
Surface Finish Chart Tables
Surface Finish Chart Tables: Complete Guide to Surface Finish Charts, RA, RZ, Measurements, Callouts and Symbols.
Tap Speeds and Feeds Calculator
Tap Speed and Feed Calculator: Tapping speed (RPM) and feed rate for UNC, UNF, and metric threads, with the tap drill size for a 75% thread and a G84 line for rigid tapping.
Our free NPT and Pipe Thread Calculator handles NPT pipe threads.
Drill Feeds and Speeds Calculator
Drill Feeds and Speeds Calculator: A quick free calculator for drilling feeds and speeds.
Fits and Tolerances Calculator
A quick Free ISO Tolerances Calculator based on ISO 286, ANSI B4.2, and DIN 7172. What a perfect addition to any machinist calc!
Drill Bit Size Chart
Drill Bit Size Chart: A quick free drill bit size chart, downloadable pdf, and drill size calculator for more serious work.
Metal Weight Calculator
Metal Weight Calculator: Calculate volume and weight for a variety of materials and metals with our free calculator.
Geometry Calculator
Geometry Calculators to solve for common challenges in the shop and for cnc programmers:
- Drill Point Length Calculator
- Circular Segment Calculator (and Chord Calculator)
- True Position Calculator
- Trig Functions
- Triangle Solver & Triangle Solutions
- Right Triangle Solutions
These are just the sort of thing you look for in a good machining calculator.
Bolt Grades Chart and Strengths [ Quick Reference + PDF ]
Decode both US and Metric bolt grade markings and get the strength info as well.
Board Foot Calculator
This article shows how to calculate board feet using a formula, charts, and our free calculator.
Rivet Sizing Chart
This article provides you with a rivet sizing chart and an easy guide to how to use the information to choose the proper rivet size for your application.
Lathe Feeds and Speeds Calculator
This article our free lathe feeds and speeds calculator.
CNC Chip Load Calculator
Article on our free CNC Chip Load Calculator.
Vacuum Table Pop-Off Calculator
Vacuum Table Pop-Off Calculator: Quit scrapping parts because they pop off your vacuum table.
This machinist calculator will limit your feed calculations based on the vacuum and surface area of your part together with tool settings combined to keep it firmly held on your vacuum table.
Free CNC Software
Best Free CAD Software? Best Free CNC Software? Check it out.
CNC Reference Information
Yup, it's true, you got this far and didn't find the information you were looking for. Happens to the best of us. When all else fails, I always turn to Machinery's Handbook to look for information.
One more sneaky trick: buy one or two editions back-not the latest. Most of the info hardly changes and you'll save a bundle!
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