By Tom Lipton

Metalworking Sink Or Swim: information And methods For Machinists, Welders, And Fabricators.

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Extra info for Metalworking Sink Or Swim

Example text

420. 419, which agrees closely. Try it yourself with a few angles to assure yourself of the scaling. I have found this to be a very useful Figure 2-40: Graphic illustration of the relationship of the Sine of 1 degree. 28 Chapter 2 Figure 2-41: Calculating arc lengths. technique. A typical question you might want to answer using this trick is: what is Ϯ1 degree at a 10-inch radius? 01745 ϭ arc length For small angles, the rise and the arc length are almost the same. This technique works best for calculating longer arc lengths where the angle is much larger.

I tend to round off the decimal and just use 40 lbs per square foot. This gives an answer accurate to 2%. 283 lb/cu”. 3 and be within 6%. • Aluminum is approximately 1/3 the density of steel. 10 lb/cu”, depending on the alloy. This is easier to remember than the exact number. It’s also an easy factor to divide or multiply by. 101 per cu in, and the rest are so close it’s almost irrelevant. • The United States five-cent coin (the nickel) weighs almost exactly five grams. It is so close, it’s scary.

015 cleanup if the raw material is rough or has come in slightly undersize. 005, then your part just tripled in price. Include stock material variances in your tolerance study. 500 like I see on almost every drawing that crosses my desk. Most of the time the engineer or designer has no intention of machining or surfacing stock material. 50 (STOCK) is a great way to communicate the proper intent. Only ask for maximum speed and effort when you really need it. There is no faster way to wear out your welcome than to abuse this powerful tool.