Cutting Speed And Feed For High Speed Steel Tools - Smithy GRANITE 1300 SERIES Operator's Manual

The data table provides exact speeds (RPM). It
does not take machine speed limitations into
account. Determine the desired rate of speed and
find the closest speed available on your machine.
Cutting Speed and Feeds for
High Speed Steel Tools
The energy expended at the lathe's cutting point converts largely into heat, and because
the energy expended is great, the heat is intense. Before today's HSS, carbide, and
ceramic tool, this heat created a serious machining problem. Machining could be done
only under a steady flow of coolant, which kept the tool from heating to its annealing
point, softening, and breaking down.
With HSS, you can cut dry on cast iron or non-ferrous metals unless a small lathe is
running at extremely high speed on continuous, heavy-duty production work. Because
steel expands when heated, it is a good idea, especially when working on long shafts, to
check the tightness of the lathe centers frequently and make sure workpiece expansion
does not cause the centers to bind.
Cutting Speeds and Feeds for High Speed Steel Tools
Low-Carbon
Steel
Speed (sfm)
90
Roughing
120
Finishing
Feed (ipr)
0.010-0.202
Roughing
0.003-0.005
Finishing
! NOTICE !
High-
Carbon Alloy Steel
Steel Normalized
Annealed
50 45
65 60
1.101-0.020 0.010-0.020
0.003-0.005 0.003-0.005
Or Visit www.smithy.com
Appendix A: Machining Reference Guide
Aluminum
Cast Iron
Alloys
200 70
300 80
0.015-0.030 0.010-0.020
0.005-0.010 0.003-0.010
Bronze
100
130
0.010-0.020
0.003-0.10
A-3