Page 899 - Tungaloy Catalog

Precautions

Whipping guide Coolant
When using long GunDrill at high speed, steel pipe encounters whipping A water-insoluble fluid is recommended in machining with
effect due to centrifugal force. This phenomenon is strongly affected GunDrills. When using water soluble fluid, use the fluid for
with cutting speed and pipe length. Red colored portion in the following heavy duty cutting in higher concentration.
graph shows the area in which whipping guide should be used.
80
70 Whipping
60 guide should be
Lp/D 40
Lp 50 used
30
20 Recommended condition

Lp
Guide Whipping 20 60 100 140 180 220 260 300
bush guide Vc (m/min)
Available range of special order tool
Minimum order quantity 3 pcs
Tool diameter: øDc = 3.0 – 24.0 mm
Overall length: shown in table below
Driver type: A or M type (shown in fig. below)
Available range
Note: If another type of driver is needed, please confirm when requesting quotation.
Grade: G2F
Note: Coated gundrill is not available.
Available range of overall length M type
øDs h6
Tool diameter range Overall length
øDc (mm) L max (mm) R2 6
Rs
3.0 ≤ øDc < 4.1 800 Tool dia. Driver dia. øDs (mm)
øDc (mm) øDs R 2
4.1 ≤ øDc < 4.9 1250 Rs
3.00 ≤ øDc < 14.00 20 50 38
4.9 ≤ øDc < 24.0 2000 14.00 ≤ øDc < 20.00 25 55 43 11
Example of tool designation 20.00 ≤ øDc ≤ 24.00 32 60 48
LJ - 5.0 L600 A 19.05 Drilling Tools

1 2 3 4 5
１ Series 2 Tool diameter: øDc (mm) 3 Overall length: L (mm)
1
LJ GunDrill 5.0 ø5.0 L600 600
4 Driver code 10.99 ø10.99 L1010 1010
A A 5 Driver diameter: øDs (mm)
M M 19.05 ø19.05
S Special 20 ø20.00

Overall length Bushing Drill Overall length = A + B + C + D + (E) + F
guide
bushing
calculation Chip
evacuation
Driver area Workpiece Tip
A : Regrinding area
B : Hole depth
C : Length of chip evacuation area
D : Length for whipping guide
(E) : Some margin
F : Driver length
F (E) D C B A

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