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Tag Archives: milling for share

CUTTING TOOLS IN HIGH-SPEED MACHINING

Metal removal rates are faster today than ever before. What was considered high-speed machining a few years ago is now regarded as conventional. Two major factors in high-speed machining are sfpm (surface feet per minute) for the machine tool and ipt (inches per tooth) or inches per revolution for the cutting tool.For heavy metal removal, …

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TURNING CENTER PROGRAMMING

Turning center or lathe programming follows much the same techniques as those used for machining center programming. A part drawing must be studied to determine the sequence of machining operations and the cutting tools required. The programmer must be familiar with the material being machined to select appropriate feeds and speeds. Once again, as in milling, programming should be …

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CAPABILITIES OF THE CENTER-TYPE CYLINDRICAL GRINDER

Most common is simple traverse grinding (Figure L-119). This may be done on interrupted surfaces (Figure L-120) where the wheel face is wide enough to span two or more surfaces. Multiple-diameter-form grinding (see Figure L-13) is a type of plunge grinding in which the wheel may be form dressed to a desired shape. In …

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GRINDING-IN A MAGNETIC CHUCK

The first step in surface grinding is to check, and if necessary grind-in, or true, the chuck. Truing the chuck is usually not necessary unless it has been removed and reinstalled or a new chuck is being used for the first time. Any grinder chuck should be checked occasionally and, if necessary, trued by grinding a …

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GRINDER CHUCKING SETUPS

Odd-Shaped Workpieces A magnetic or vacuum chuck will exert the most reliable holding power on an odd-shaped workpiece, if the area of contact with the chuck is large enough. Whenever possible, place the workpiece so that the largest surface area possible is on the chuck. Sometimes it is necessary to block a small or thin …

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ACCESSORIES

The versatility of the horizontal surface grinder can be extended by the use of accessory equipment. Several of these pertain to work holding and will be discussed in the next unit. Accessories that increase the grinding capability of the machine include the following. Centerless grinding can be accomplished using the centerless attachment (Figure L-77). Parts …

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TYPES OF GRINDING FLUIDS

Water-Soluble Chemical Types Water-soluble chemical types of fluids, called synthetic fluids, are typically mineral-oil free. They are usually transparent, which helps with visibility. Some are compounded to provide good rust control; others are chemically active, to promote cutting, and can damage machines that are not carefully maintained. They are not prone to bacterial growth. They provide …

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OTHER FACTORS IN WHEEL SELECTION

Grinding is probably the most challenging part of machine tool operation because so many variables must be integrated to get first-class results. Four of these factors relate to workpiece materials, which are constantly being changed in the shop environment. Four other factors in wheel selection are relatively fixed. Variable Factors Composition of the Workpiece For most steels …

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USE OF FACE MILLING CUTTERS

The lead angle, which is the angle of the cutting edge measured from the periphery of the cutter, varies from 0 to 45 degrees, depending on the application. Small lead angles of 1 to 3 degrees can be used to machine close to square shoulders. A small lead angle cutter, when used with a square insert, will …

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SIDE MILLING CUTTERS AND SIDE MILLING

Milling cutters with side teeth are called side milling cutters. These are used to machine steps and grooves or, when only the sides of the workpiece are to be machined, in straddle setups. An example is cutting hexes on bolt heads. Grooves are best machined in the workpiece with full side mills that have …

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