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SHOP NOTES 475
Weight of a Grindstone.
Multiply the constant 0.064 by the square of the diameter
in inches and this product by the thickness in inches; the result
is the weight of the grindstone in pounds.
Example.
Find the weight of a grindstone 30 inches in diameter and
six inches thick.
Solution
:
Weight = 0.064 X 30 X 30 X 6 = 346 pounds.
Lathe Centers.
In this country lathe centers are universally made 60 de-
grees, but in Europe the most common practice is to make lathe
centers 90 degrees.
Lathe Mandrels.
Lathe mandrels made from tool steel should be hardened
and ground with lapped centers. They are made slightly taper,
about 0.006 inch to 0.010 inch per foot. Mandrels less than 1
inch in diameter ought to be about 0.0005 inch under size at
the smallest end, and mandrels from 1 inch to 2 inches 0.001
inch under size at the smallest end.
The length of mandrel up to 2 inches in diameter may be
about 3 inches more than 5 times the diameter. For instance,
a mandrel l
/z inch diameter may be $% inches long, and a man-
drel 2 inches diameter may be 13 inches long. Larger sizes
may be little longer but ordinarily mandrels, except for special
work, do not need to be more than 15 to 18 inches long.
Common Sizes of Steel Used for Lathe and Planer Tools.
For forged tools for lathes and planers, the common sizes
of steel are Y% X % inch, Y% X K inch, ^Xi inch, Y% X 1 X inches,
X inches, KXiK inches.
TABLE No. 88.—Angles and Corresponding Taper.
Angle one
side with Included
the center Angle Taper per Inch Taper per Foot
line
i° r O.OO873" O.IO5"
1 1 O.OI746 O.209
1 a O.O2619 O.314
I 2 O.O3492 O.419
ii 2* O.04364 O.524
1* 3 O.05238 O.629
2 4 O.06984 O.838
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