Page 1043 - Tungaloy Catalog

Technical Reference
Drilling Tools
d Chip shapes which tend to entangle and remedies against them
Apple peel like chips Short lead chips Very long chips
b
a
c
These chips are often produced in These chips are often produced in Often produced in machining mild
machining mild steels or low carbon machining stainless steels at steels or low carbon steels under
steels at low speeds and low feeds. low feeds and tend to entangle to improper cutting conditions.
the tool despite the short length.
Remedies Remedies Remedies
Increase the cutting speed in stages Increase the feed by about 10 %. If Increase the cutting speed in stages
by 20% within the range of standard there is no effect, increase the cutting by 20% within the range of standard
cutting conditions. If there is no effect, speed in stages by 10% within the cutting conditions. If there is no effect,
increase the feed by about 10 % as range of standard cutting conditions. decrease the feed by about 10 % as
the cutting speed is raised by 20%. the cutting speed is raised by 20%.

P

Apple peel like chips (Without curling) Continuously curled “C” shape chips with short lead (P). Continuously coiled long chips

Cutting forces

The charts below show a guideline for cutting forces. Use TDX drills on a machine with ample power and sufficient rigidity.

d Guidelines for cutting forces

16 LOAD % 5 4 100
Net power consumption (kW) 12 8 6 4 .005 ipr Thrust force (kN) 3 2 .005 ipr Torque (N·m) 60 .005 ipr
14
80
10
40

.003 ipr
.003 ipr
.003 ipr
0 2 .004 ipr 1 0 .004 ipr 20 0 .004 ipr Technical Reference
.393 .787 1.181 1.574 1.968 2.362 .393 .787 1.181 1.574 1.968 2.362 .393 .787 1.181 1.574 1.968 2.362
Drill diameter (in) Drill diameter (in) Drill diameter (in)
Cutting speed: vc = 3.93'' SFM
Work material: Alloy steel (JIS SCM440), 14
240HB
Cutting fluid: Used

14–25