Text-Book of Advanced MacHine Work
by Smith
Format: Paperback
ISBN13: 9781152875180
Paperback|9781152875180
Out of Stock
Overview
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...20. The periphery speed for wheels should be approximately from 5000 to 6500 feet per minute (F.P.M.). A higher speed may cause the wheel to break. Should a wheel heat or glaze, run it slower. If it is too soft, it can often be made to hold its size by using a higher speed. The table given below designates number of revolutions per minute for specified diameters of wheels, to cause them to run at the respective periphery rates of 4000, 5000, and 6000 feet per minute. Table Of Speeds For Grinding Wheels 21. The periphery speed of work (F.P.M.) should be proportional to the grade and speed of wheel, also to the diameter of work. The speed varies from 15 to 60 feet per minute for different classes of work. The higher speed is best for cast iron and the lower for duplicate work. 22. Direction of rotation of wheel and work must be opposite at cutting point as in Fig. 4. 23. Feed of table or traverse speed is in proportion to the width of wheel face and finish required. Use coarse feed for roughing. For large work with a heavy machine, use one-half to three-fourths width of wheel to each revolution of work; on light machines use one-third to one-half width of wheel. For a very fine and accurate finish, use one-fourth to one-third width of wheel. 24. Depth of cut.--For roughing take deep cuts, --.001" to.004" at each stroke; for finishing, light cuts, --.00025" to 0005" at each stroke. The sparks thrown off by the grinding wheel indicate the depth of cut: a large volume of sparks indicates a heavy cut, and a small volume a light cut. 25. Width of face of wheel.--A wide wheel with a coarse feed, removes stock rapidly, and is used where it can pass from one-fourth to one-half its width beyond the end of work or recess. A narrow...
| ISBN-13 | 9781152875180 |
|---|---|
| ISBN-10 | 1152875183 |
| Weight | 0.81 Pounds |
| Dimensions | 9.00 x 6.00 x 0.56 In |
| List Price | $20.59 |
| Format | Paperback |
|---|---|
| Pages | 246 pages |
| Publisher | |
| Published On | 2010-01-01 |
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