Instruction Manual
Section Five
Figure 15—Developing the relief angle
when using a straight wheel.
Figure 16—Developing the relief angle
when using a cup wheel.
1. Setting the Toothrest, Using a Straight Wheel (SEE TABLE I. PAGE 104,
FOR CLEARANCE ANGLE SETTING.)
Figure 15 illustrates a milling cutter being ground with a straight wheel
The distance C between the center lines of the wheel and cutter varies
with the relief angle. The method of producing the desired relief angle,
when using a straight wheel, is as follows:
(a) Bring the center of the wheel and the work onto the same plane.
(b) Fasten the toothrest to the table of the machine and adjust the tooth-
rest to the same height as the center of the work, using a height gauge
(c) Raise (or lower, depending upon the direction of wheel rotation) the
Wheelhead the proper distance by means of the graduated hand wheel.
The distance to raise or lower the Wheelhead when using a straight
wheel may be calculated as follows: Multiply the relief angle in de-
grees by the diameter of the wheel in inches, and this product by
the constant .0087.
Sample solution for determining the distance to raise or lower the
Wheelhead for a 7 degree relief angle, using a straight wheel 6 inches
diameter: C = 7 degrees X 6 inches X .0087 = .365 inches.
2 Setting the Toothrest, Using a Cup Wheel, (NON-TILTHEAD GRINDERS):
(SEE TABLE II, PAGE 105, FOR CLEARANCE ANCLE CHART SETTINGS.]
Figure 16 shows a cup wheel being used for sharpening a cutter. The pro-
cedure for producing the desired relief angle of a spiral milling cutter, for
example, is obtained as follows:
(a) Fasten the toothrest to the Wheelhead and align the toothrest and
center of the cutter on the same plane, using a height gauge.
(b) Raise or lower the Wheelhead with the toothrest the required distance.
To calculate the distance when using a cup wheel, multiply the re-
quired relief angle by the diameter of the cutter in inches and this
product by the constant .0087.
Sample solution for determining the distance to raise or lower the
Wheelhead beyond the center of a cutter 3 inches in diameter, in order
to produce a relief angle of 5 degrees using a cup wheel 4 inches in
diameter: C = 5 degrees X 3 inches X .0087 = .130 inches.
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