Production Machining

SEP 2018

Production Machining - Your access to the precision machining industrial buyer.

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Page 18 of 75 :: 17 Helping Precision Machine Shops Be More ProducƟve and Proftable Congratulations on your graduation! Congratulations on persevering and completing a major life milestone. Your experience with completing your education through high school bodes well for your continued success in life. Speaking of success, congratulations again for choosing a career in machining. Machinists are the people who make things, and when you think about it, our lives today would be miserable without the things that machinists make. You know, like the pumps that give us fresh water, appliances to keep our food safe and HVAC to keep our homes comfortable. I'm not sure I know anyone without access to a car, thanks to machinists for fuel injection that makes cars go, brakes that make them stop and airbag components to protect us when there is an operator failure. And guess who makes the bone screws and other medical parts that are used to repair our bodies when they need serious rebuilding? Machinists are in very high demand right now, and after you get a few years of experience in the shop, you will find that you are one of the most valued people in the company. You will have a positive career trajectory of increasing responsibility as your knowledge and experience grows. As more and more of the baby boomer generation retire, your experience will be what your shop relies on to solve the issues that seem to arise daily in manufacturing operations. I'm talking about job security as you gain experience and knowledge. I am so pleased that you have chosen a career in machining. Enjoy the rewarding experience of making things that make a difference and the joy of seeing what you have made every day and knowing that the parts you made really matter to someone. In order to help you become even more accomplished in your new craft, I am pleased to provide you with a head start on some lessons learned over the course of my 45 years in the manufacturing business. These will all serve you well, if you consult them. Lesson one: Read "Machinery's Handbook." The answers that you need are likely in there somewhere. In the steel mill, I used it primarily for the geometric formulas in the front, such as calculating the weight per foot of a hex round or other shape that requires an accurate calculation of the profile's area and volume. You'll find all the formulas that you need in the "Areas and Volumes" section. The distances across corners for squares and hexagons are also in there. Look in the section "Mathematical Tables." You'll notice that I wrote the weight per cubic inch for steel on the title page of the copy I gave you. If it is a number that you will need many times, why not make it easily accessible? That figure right beside it? That is the weight of steel per cubic foot. Yes, steel is that heavy. Trig functions are found in the section immediately following "Solution of Triangles." You'll be using them more than you might think. The sections on mechanics and strength of materials are important as well, but you knew that. If you get into machining gears, well, "Machinery's Handbook" will be your constant companion. The sections on screws, threads, allowances and fits are well- worn in my personal copy. I'll bet that yours will be too, if you have interesting work. The sections covering speeds and feeds and cutting tools are a good first start for reference, but I admit that modern tool substrates, coatings, geometries and CNC programming techniques, such as trochoidal milling, make the info in the handbook a charming reminiscence. Still, if you have no more current information, it will give you a place to start. There is a good primer on steels, Letter to a New Machinist By Miles Free – Director of Industry Research and Technology Continues on page 20

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