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reduced-rake points

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Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002135
EISBN: 978-1-62708-188-7
.... A variety of drill point styles, such as single-angle points and reduced-rake points, are described. The article discusses the factors considered to obtain expected dimensional accuracy of holes. It explains the determination of the optimum speed and feed for drilling, which depends on the workpiece...
Image
Published: 01 January 1989
Fig. 8 Front (a) and side view (b) of spiral-point drills used in drilling titanium. Grinding of spiral points produces a better drill for titanium than conventional chisel edge. Spiral points reduce the large negative rake angle of the chisel edge drill, provide a proper clearance angle along More
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002187
EISBN: 978-1-62708-188-7
... and tool fracture can occur. Built-up edges can be prevented by reducing friction and heat generation at the rake and clearance surfaces adjacent to the cutting edge. Sharp tools, proper rake and clearance angles, polished tool surfaces, and properly balanced feeds and speeds help prevent the occurrence...
Image
Published: 01 January 1989
Fig. 22 Front (top) and side views (bottom) of four types of drill point geometries used for different applications. (a) Single angle. (b) Double angle. (c) Reduced rake. (d) Four facet More
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006494
EISBN: 978-1-62708-207-5
... at the cutter with single-point cutting tools having 0 and 20° rake angles Table 4 Power requirements for machining aluminum alloys as measured at the cutter with single-point cutting tools having 0 and 20° rake angles Alloy AA Power 0° rake 20° rake (kW/mm 3 /min) × 10 −4 hp/in. 3 /min (kW...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005102
EISBN: 978-1-62708-186-3
... blade engagement increases as it travels through the material; this results in a greater required shearing force. A higher rake reduces the shearing force and allows the use of a smaller machine to shear the material than would be necessary if the cutting edges of the knives were parallel. However...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006363
EISBN: 978-1-62708-192-4
... and the harder material tends to seize against the tool rake face. Farther along the contact, the temperature is higher and the softer chip slides more easily. The BUE can change the effective rake angle at the tool point, which affects the cutting force magnitude ( Ref 4 ). Diffusion depends on chemical...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002186
EISBN: 978-1-62708-188-7
... the roughness of the machined surface and increases power consumption. The side rake may vary from 0 to about 10°. The design of form tools for taking wide cuts or for turning specially shaped contours is similar to that of single-point finishing tools, except that the back rake should be reduced to about 3...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002188
EISBN: 978-1-62708-188-7
... drills with a heavy web are recommended for drilling group C and D alloys. Cobalt-bearing high-speed steel drills give longer tool life. Cutting pressures are reduced and a positive effective rake maintained if the web is thinned at the chisel point. Increasing the point angle to 135° is helpful...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003187
EISBN: 978-1-62708-199-3
... often be eliminated or minimized by reducing the depth of the cut, increasing the cutting speed, using positive rake tools, or applying a coolant, but these techniques greatly increase the complexity of the chip formation process analysis. Fig. 4 Continuous chip with built-up edge Tool Wear...
Book Chapter

Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002144
EISBN: 978-1-62708-188-7
... at the cutting edge. Clearance angles are always positive and are usually divided into primary and secondary angles ( Fig. 18 ). Axial Rake Angle Axial rake angle (not shown in Fig. 18) is measured between the peripheral cutting edge and the axis of the cutter, when looking radially at the point...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005519
EISBN: 978-1-62708-197-9
... can be reduced. Interface Friction In metal cutting, the primary friction force is tangent to the rake face. There is a small secondary friction force acting on the flank wear land. The vast majority of research has been devoted to understanding rake-face friction behavior, because it makes...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006559
EISBN: 978-1-62708-210-5
... with considerable top rake. Milling speeds in roughing are 500–700 sfpm, with high-speed-steel cutters for a feed of 100–250 mm (4–10 in.) travel of work and 6.5 mm (0.25 in.) maximum depth of cut. Standard high-speed steel drills on a drill press should have a 118–140° point angle, 24–40° spiral angle and 15...
Book Chapter

Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002132
EISBN: 978-1-62708-188-7
... metals because it aids chip flow and reduces face wear. Side rake angles range from 3 to −15°, also depending on the machinability of the work metal. A side rake angle of 3 to 0° is usually suitable for free-cutting metals, 0° for medium-carbon steels, −3° for gummy metals, and up to −15...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002185
EISBN: 978-1-62708-188-7
... brass. Dimensions given in millimeters Single-Point Turning Zero to moderate rake angles are recommended for group 1 alloys to reduce the probability that the tool will plow into the work. Rake angles are increased for turning alloys of groups 2 and 3 to provide a free flow of chips. Table 3...
Book Chapter

Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002143
EISBN: 978-1-62708-188-7
... of a radial chaser is determined by adding the visible rake angle B (if positive, as in Fig. 4a ) to the point-height angle A. If angle B is negative, the true rake angle is determined by subtracting angle B from the point-height angle A. Fig. 4 Radial chasers and their positions in a self-opening die...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002179
EISBN: 978-1-62708-188-7
...” in this Volume). Once the drill is engaged, low-carbon steel under the chisel edge is first extruded by the high-thrust force, then it shears under the action of the negative-rake cutting angle. Built-up edge occurs along the chisel edge and can be reduced by lowering the frictional heat. The extruded steel...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005178
EISBN: 978-1-62708-186-3
..., due to the rake angle of the shear blade. Hydraulic power is noted for its maintenance-free performance, shock-free operation, and the ability to operate more than one machine from a single power source. The stroke of the ram can also be controlled for quicker cycle times. For example, if the cycle...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002190
EISBN: 978-1-62708-188-7
..., and all machining operations result in high rates of wear. Carbide tools with high side rake are preferred for turning and boring. Nominal speeds and feeds for turning molybdenum with single-point and box tools are given in Table 1 . The same information for turning with cutoff and form tools...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002150
EISBN: 978-1-62708-188-7
... force and the shallowest metal removal parameter (MRP) slope (metal removal rate per unit force). This means that for any Z value (any horizontal line from the vertical axis) the 45° tool would always use the least force and that the force would increase as the rake angle is reduced to 40, 35, and 25...