Machinist Kalc Programs

Milling machine arbor and spindle tapers require a 3 1/2 inch (29.17%) taper per foot. Download and print this handy chart and keep nearby to assist you with frequent tapers. The arbor taper chart shows dimensions in inches and millimeters for sizes 30, 40, 50, 60 and I, J, K, L, M, N, O, P, Q, R. Standards are not established for metric thread sizes for K. The spindle taper chart also shows dimensions in inches and millimeters for sizes 30, 40, 50, 60 and A, B, C, D, E, F, G, H. Standards are not established for metric thread sizes for H. Thanks for visiting MachinistKalc.com today.

Every machinist will eventually have to make or use taper pins. So, this month's helpful tip for you to download and print includes tables of metric and standard taper pins sizes. This download consists of 3 pages.  The metric table shows the metric diameter at the small end measuring from 1 to 20 millimeters and the length of taper pins from 10 to 150 millimeters. The standard table shows the diameter at the small end from .1306 to .6665 and the proper drill sizes to use. The standard table also shows the length of the pins from 1/2 inch to 5 1/2 inches. Sample of metric size chart Sample of standard size chart Thanks for visiting MachinistKalc.com .

This month's tip is a free downloadable chart that shows drilling speeds for high speed drills. The suggested cutting speeds are expressed in feet per minute, meters per second, and meters per minute. Sample of Drilling Speeds Chart Materials list includes: Aluminum and its alloys, ordinary brass and bronze, heat treated metals, stainless steel, titanium alloys, wood, and more. Feeds for drills at the bottom of the chart show the diameter of drills in inches and the feed in inches per revolution; also, the diameter of drills in mm and feed in mm per revolution. Thanks for visiting www.machinistkalc.com .

These tables of cutting speeds are for metric, fraction, letter, and number size drills, which I'm providing as a free download . They provide speeds as follows:  Metric Drills Cutting speeds for 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120 meters per minute. Revolutions per minute are provided for the following diameters in mm and their coinciding meters per minute listed above: 1.5, 2. 2.5, 3, 3.5, 4, 4.5, 6, 7.5, 9, 10.5, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70.  Sample of metric cutting speeds table Fraction Drills Cutting speeds for 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 feet per minute. Revolutions per minute are provided for the following diameters in inches and their coinciding feet per minute listed above: 1/16, 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8, 1-1/2, 1-5/8, 1-3/4, 1-7/8, 2, 2-1/4, 2-1/2, 2-3/4, 3 Sample of fraction cutting speeds table Letter Drills  Cutting speeds for 30, 40, 50, 60, 70, ...

Today's handy tip is a PDF download for a chart that shows  decimal inch equivalents  to metric size drills as shown in the sample image below. The sizes range from 0.35 mm/.0138 inches to 15 mm/.5905 inches. Here's a link to all my Machinist tips in case you've missed any. I have had a contact form issue (Contact tab is at the top of this page) and have fixed that if you should need to get in touch with me with questions or requests. Thanks for visiting MachinisthKalc.com

Reconditioning a drill not only keeps your drills in top performance for the next job, but will also save money until the drill can no longer be reconditioned. Today's tip will show you how to thin web thickness, remove worn sections of a drill, and regrind a point surface. This tip goes hand in hand with an earlier tip I posted about  drill troubleshooting . Download this free   7-page tip sheet , print it out, and keep nearby while performing any of these reconditioning processes.  Thanks for visiting machinistkalc.com today.

Knowing whether to use a blunt or acute point is critical when using a twist drill. This may require modifying (grinding) the standard drill point angle to accommodate those needs. Download and use this tip sheet for the best points to use on the most frequently used materials including: thin sheet metal, plastics, wood, soft and medium hard brass, fiber, rubber, aluminum, marble, heat-treated steels, and many more. If you like this post, you might also like my February 2024 tip which discusses drill bit nomenclature and provides a download for easy access to those named parts. Thanks for visiting www.MachinistKalc.com today.

As a machinist, it's important to know the names and location of each part of a drill bit. Because each part has a specific function, and knowing the functions makes them easier and safer to use. I'm providing a basic download to help you better understand drill bit nomenclature. Please contact me if you're unable to download this simple tool . More on drill bits will be available next month. Until then, take care. www.MachinistKalc.com

Today's download  is 8 MB, 53 pages long, and provides formulas  for trig functions that every machinist will use most of the time. Find the sine, cosine, tangent, cotangent, secant, and cosecant of angles. Download the file to your phone or print and keep it nearby for these types of jobs.

Every machinist deals with right triangles on a regular basis, so my gift (a.k.a. machinist tip) to you this month is this highly beneficial 2-page PDF document, because it's impossible to remember ever formula. Download and/or print this handy PDF file of formulas to calculate right triangle sides and angles .  Merry Christmas from www. MachinistKalc.com . 

Today I'm offering a PDF download of a Table of Squares and Square Roots - a must-have for any machinist. The table provides N 2  and √ for numbers ranging from 1 to 100. Just click on the link above to download and print, and keep it in your wallet or toolbox. If you have the capability of saving PDFs to your smart phone, it may be easier to keep this table at your fingertips. If you aren't able to download PDFs to your device, you can save it to your Google Drive and open it from there on your phone. Thanks for visiting MachinistKalc.com .

I hope you enjoy this free chart that covers drill letter sizes from A to Z. Conversions are decimal equivalents as partially shown below. Print out the conversion chart or save to your smart phone so you will have this readily available whenever you need it.  Thanks for visiting www.MachinistKalc.com .  

Decimal Equivalents of Number Size Drills is our August 2023 tip. If you frequently use numbered drills, you'll want to print this PDF and keep it nearby at all times. You'll be able to easily find the decimal sizes for drill numbers 1 through 80. Please contact me if you have any problems downloading the PDF or if you have any questions or recommendations for tips. If you haven't done so already, be sure to sign up for my newsletter at the top of the page so you don't miss any monthly tips or new GrafnCalc program releases.  Thanks for visiting www.MachinistKalc.com . 

Using Common Angles and Standard Pins to Calculate Gibs and Dovetails In this PDF download , you will receive standard pin diameters in fraction and decimal form from 3/64 inch (0.04688) to 2inches (2.000) for 45- and 60-degree angles for E, F, and G. Thanks for visiting www.MachinistKalc.com today. These tips are some of the best tools a machinist can have. I also have more Machinist Tips available. 

Troubleshooting Drill Problems If you’re doing a lot of drilling and you’re running into a few problems, I think you’ll like today’s tip. Some common problems you will run across with drills is the breakdown of outer corners, rough holes, oversize holes, and more. Download this general troubles and causes sheet to keep in your toolbox so you can correct your problem and get back on track quickly. Thanks for visiting www.MachinistKalc.com today. I hope you find these tips to be helpful tools .

Can you imagine a world without threaded  nuts and bolts? When you think about it, almost everything in the world is held together by nuts and bolts - vehicles, homes, bridges, chairs just to name a few. You could say that our lives are literally hanging by a thread.  Of course, threads are used in other materials as well such as pipes. And threads come in different pitches; some are standard and some are metric; some are internal and some are external. And it's a machinist's job to make sure these threads are precise for the jobs they must perform. So, as a veteran machinist with over 40 years of experience, I have posted a few thread tips and created some GraphNCalc83 programs to help you double check your calculations for external pipe threads , internal pipe threads , and for diameter calculation  over three-wires of 60 degree threads. Image courtesy of  Dan Cristian Pădureț via Unsplash I'm so glad you visited www.MachinistKalc today. Be sure to sign up for ...

A hexagon, as mentioned in a previous post , is often used in nature due to its amazing strength. One of the earliest hexagonal written thoughts dates back to 36 BC when Roman polymath, Marcus Terentius Varro, reported that the hexagonal shape makes the most efficient use of space and building material. (Source: Wikipedia ) From that point, builders and manufacturers have been busy as bees using the hexagon to build their man made creations.  Image courtesy of   Meggyn Pomerleau With that being said, a machinist often uses two of history's genius hexagon inventions - hex nuts and bolts with hex heads. These handy fasteners allow for an excellent grip without slippage when tightening. As machinists, we also make plenty of hexagons in our career. That's why I decided to revisit my hexagon tips  and GraphNCalc83 programs I created to calculate a  hex angle , hex point 1 , hex point 2 , and  diameter calculation for hex and square. My coworkers and I use...

As with all of the downloads I provide as helpful tools on this site, this Mill and Lathe  Formulas chart  is handy to keep nearby. This chart provides formulas for SFM cutting speed, RPM, FPR, FPT, MRR, converting IPR to IPM and IPM to IPR, and much more as shown in the picture below. It also includes conversion formulas for inches to metric and metric to inches. I'm always happy  email  the chart to you if you're unable to download it.  Thanks for visiting www.MachinistKalc.com . And remember to tell your friends about our affordable programs and free downloads. 

Today's download is a  Tapping and Threading Formulas chart. You'll get formulas for inch taps as shown in the image below as well as for metric taps, and also two examples of tap drill size calculations for both inch and metric. This  helpful chart is a must have for any machinist. Keep it on your phone or print it to keep in your toolbox. Contact me if you're unable to download the chart; I'll be happy to email it to you. Thanks again for visiting www.MachinistKalc.com . Have a nice day.

Today's tip is a chart for Pipe Thread Sizes  that you can download free of charge. This chart provides the Tap Thread Size, Approximate Inside Diameter, Approximate Outside Diameter, and Tap Drill Size of the most commonly used standard threaded pipe sizes. Find out more information about charts and other tools you should keep on your phone or in your toolbox for easy accessibility. Contact me if you have any trouble downloading this chart. Thanks for visiting wwwMachinistKalc.com today.