17
Model 301.5SP Tube Squaring Machine
92-1755 Rev. 200324
7. CUTTING SPEEDS AND FEEDS
7.1 CUTTING SPEEDS
True DIA
RPM for
200 in/min
(5080 mm/min)
RPM for
250 in/min
(6350 mm/min)
RPM for
300 in/min
(7620 mm/min)
.250" (6.4 mm)
255
318
382
.375" (9.5 mm)
170
212
255
.500" (12.7 mm)
127
159
191
.750" (19.1 mm)
85
106
127
1.00" (25.4 mm)
64
80
95
1.25" (31.8 mm)
51
64
76
1.50" (38.1 mm)
42
53
64
2.00" (50.8 mm)
32
40
48
*Cutting Speeds are approximate. Reducing the RPM will significantly increase tool bit life
and reduce the formation of burrs.
Use 200 surface inches per minute (5080 surface millimeters per minute) for:
•
Stainless steels in general when no coolant is allowed, all heavy-wall tube
and some chrome/molybdenum steels.
Use 250 surface inches per minute (6350 surface millimeters per minute) for:
•
Mild steels and some thin wall stainless steels when coolants are
permitted and applied.
Use 300 surface inches per minute (7620 surface millimeters per minute) for:
•
Aluminum and thin-wall mild steel and tube with coolants.
7.2 FEED RECOMMENDATIONS
Use very light feed for initial facing or until a continuous cut is established. This
is very important for longer tool bit life when cutting through flame cut or out-of-
round pipe ends.
Use adequate feed, .003” to .006” (.08 mm to .15 mm) per revolution thereafter,
to establish a continuous chip cut.
•
If the feed is too light, only light stringer chips will be removed.
•
If the feed is too heavy, the drive will start to overload and the chip will start to
have a rough or torn appearance.
Stainless steel, which work hardens, must be worked with a heavy enough feed
to prevent work hardness (.003” to .006” or .08 mm to .15 mm feed)
Do not let the tool bit burnish the surface.
Reduced feeds and speeds will normally minimize chatter problems.