Page 654 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Section 23.3 Lathes and Lathe Operations 635

TABLE 23.7
Operation Speed (rpm) Cutting speed Depth of cut Feed Tool
Parts a and b:
Outer diameter (OD)
Roughing 1150 160 ni/min 3 mm 0.3 mm/rev K10 (C3)

Finishing 1750 250 0.2 0.15 K10 (C3)

Lead
Roughing 300 45 3 0.15 K10 (C3)
Finishing 300 45 0. 1 0. 1 5 Diamond compact
Part c: Eccentric shaft
Roughing 200 5-11 1.5 0.2 K10 (C3)

Finishing 200 5-11 0.1 0.05 K10 (C3)
Part d: Internal thread
Roughing 800 70 1.6 0.15 Coated carbide

Finishing 800 70 0.1 0.15 Cermet

23.3.5 Turning-process Capabilities
Relative production rates in turning (as Well as in other machining operations de-
scribed in the rest of this chapter and in Chapter 24) are shown in Table 23.8. These
rates have an important bearing on productivity in machining operations. Note that
there are major differences in the production rate among the processes listed in the
table. These differences are due not only to the inherent characteristics of the
processes and machine tools, but also to various other factors, such as the setup
times and the types and sizes of the Workpieces to be machined.

TABLE 23.8
Typical Production Rates for Various Machining
Operations
Operation Rate
Turning
Engine lathe Very low to low
Tracer lathe Low to medium
Turret lathe Low to medium
Computer-controlled lathe Low to medium
Single-spindle chuckers Medium to high
Multiple-spindle chuckers High to very high
Boring Very low
Drilling Low to medium
Milling Low to medium
Planing Very low
Gear cutting Low to medium
Broaching Medium to high
Sawing Very lovv to low
Note: Production rates indicated are relative: Very lou/ is about
1 or more parts per hour, medium is approximately 100 parts per
hour, and z/ery high is 1000 or more parts per hour.