470 Modern Metalworking Copyright Goodheart-Willcox Co., Inc. 26.8.4 Machining Angular Surfaces Angular surfaces (bevels, chamfers, and tapers) can be milled in three ways. They can be milled by tilting the spindle head at the required angle, Figure 26-72A, by setting the work at an angle in the vise, Figure 26-72B, or by using a universal vise. When the pivoted spindle head is used for angu- lar cutting, it is essential to align the vise with a dial indicator. Make a layout of the desired angle on the work and clamp it in the vise. Position the cutter and machine to the line. Work held at an angle in the vise for machining must be set up carefully. Use a protractor fitted with a spirit level or surface gage to properly align the work. See Figure 26-73. 26.8.5 Milling a Slot or Keyway Slots and keyways can be cut on a vertical milling machine using end mills. Clamp the work in the vise and select a cutter equal in diameter to the width of the cut. Use a two-flute end mill if a blind keyway (also called a blind slot) must be cut, Figure 26-74. Otherwise, a multiflute end mill is used. Goodheart-Willcox Publisher Figure 26-72. Cutting an angular surface. A—Spindle head pivoted to the desired angle. B—Work positioned at the desired angle. End mill adapter Work C L C C pindle of spin d 30° tilted A B Goodheart-Willcox Publisher Figure 26-73. The work can be set at the desired angle with the aid of a protractor head. Be aware of Be r cutter poposition Material to be removed Vise Goodheart-Willcox Publisher Figure 26-74. Machining a blind slot with a two-flute end mill. Parallelsslellara P