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N2 Fitting and Machining Theory|Hands-On! 239 Plain or slab milling
One of the simplest operations that can be performed on a horizontal millingmachine is plain or “slab” milling. This operation consists ofmachining a plain flat, horizontal surface with cylindrical milling cutters; the length of these cutters is usually greater than the diameter. Helical cutters generally produce a much better surface finish than cutter with straight teeth.
helical cutter- produces a better surface finish
arbor support arbor
spindle nose
provides clearance between arbor and work piece
work piece machine vice machine table Figure 19.26 Slab milling
Straddle milling Te operation of milling the opposite sides of a workpiece at the same time is called straddle milling. Tis operation is used to mill square heads and hexagon heads on bolts. It is mainly done with two side and face cutters, spaced at the correct distance apart on the milling machine arbor.
side and face cutters arbor collars
workpiece Figure 19.27 Straddle milling
Figure 19.28 Straddle milling – a hexagon on the end of a bolt