Download Basic Benchwork (Workshop Practice Series, Volume 18) by Les Oldrige PDF

By Les Oldrige

A large amount of engineering paintings happens at the bench, utilizing hand instruments and methods that are moment nature to people who earn their residing in an engineering atmosphere; they most likely discovered at technical university, as an apprentice, or in all likelihood by way of the instance of older and more matured workmates.

The beginner engineer or hobbyist would possibly not have loved such merits and, for instance, could holiday loads of hacksaw blades simply because he has now not been proven easy methods to use the observed or what kind of blades he can be utilizing. This e-book units out to hide all of the basic bench methods in an easy yet informative demeanour which might help all who've come to take pleasure in operating with metals yet whose schooling didn't contain a grounding within the fundamentals of engineering benchwork.

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Additional resources for Basic Benchwork (Workshop Practice Series, Volume 18)

Sample text

STEP 1: Write the problem. 7- 5 = 8 16 STEP 2: Determine the lowest common denominator. The lowest common denominator is 16. STEP 3: Raise the fraction 7 ⁄ 8 to higher terms with the common denomina- tor 16, using 2 as the common number. 7 × 2 = 14 8 × 2 16 STEP 4: Subtract the like fractions. 14 - 5 = 9 16 16 16 Therefore, 7 ⁄ 8 – 5 ⁄ 16 = 9 ⁄ 16, which cannot be reduced. indd 34 5/11/06 9:09:57 PM Exchanging to Subtract Mixed Numbers With Unlike Fractions Example: Subtract 1511 ⁄ 16 from 285 ⁄ 32 .

Multiplying Mixed Numbers To multiply mixed numbers, first change the mixed numbers to improper fractions. After multiplying, change the improper fractions back to mixed numbers. If necessary, review chapter one to see how to change mixed numbers to improper fractions and vice versa. Example: Multiply 31 ⁄ 6 by 22 ⁄ 5 . STEP 1: Write the problem. 31 ⁄ 6 × 22 ⁄ 5 STEP 2: Change the mixed numbers to improper fractions. 31 ⁄ 6 = 19 ⁄ 6 22 ⁄ 5 = 12 ⁄ 5 STEP 3: Rewrite the problem. 19 12 × 6 5 STEP 4: Cancel, if possible.

3 9⁄ 4 × 1 3⁄ 1 STEP 4: Multiply the numerators. indd 41 41 5/11/06 9:09:58 PM STEP 5: Multiply the denominators. 3 9⁄ × 4 = 12 1 × 3⁄ 1 1 Therefore, converting to a whole number, 9 ÷ 3 ⁄ 4 = 12. Dividing Mixed Numbers To divide mixed numbers, change the mixed numbers to improper fractions, then invert the divisor and multiply the fractions. Example: Divide 35 ⁄ 8 by 21 ⁄ 4 . STEP 1: Write the problem. 35 ⁄ 8 ÷ 21 ⁄ 4 STEP 2: Change the mixed numbers to improper fractions. 35 ⁄ 8 = 29 ⁄ 8 21 ⁄ 4 = 9 ⁄ 4 STEP 3: Rewrite the problem.

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