Page 153 - Fanar

WK
Drills to remove broken taps WDG

WDG

VHM

AT

P M K P M K
Material groups
N S H N S H
Internal cooling IK -
Quality of material VHM VHM
Coating AT AT
Nakrój / Chamfer Norm -
Ć d M l ±2 l ±2 Ć d
1 1 2 2 Tol.
INDEX W9-900002
2,5 M3 38 10 3 0250
3,3 M4 46 14 4 0330
4,2 M5 50 19 5 0420
5,0 M6 50 23 6 0500
6,8 M8 60 23 8 0680 6 6
8,5 M10 80 25 10 0850
10,2 M12 80 35 12 1020

feed fz fz fz fz fz
Vc m/min ϕ 3,3-6,8 ϕ 6,8-10,2 ϕ10,2-14,0 ϕ14,0-15,5 ϕ15,5-17,5
od do od do od do od do od do od do
10 12 0,040 0,08 0,08 0,110 0,110 0,140 0,140 0,150 0,150 0,170 7
Operation instruction:
1. The workpiece has to be clamped very stable and safe.
2. The overlapping part of the tap has to be made plane with the
workpiece.
3. Centering of the drill by multiple tip-centering. In case of tip-centering
with an NC machine please choose a lower cutting feed.
4. The remove of a tap can be made with an NC machine with lubrication
(Attention: risk of bonding) also by hand with a bench drilling or column
driling machine. Multiple chipping removal is absolutely necessary.
5. Remove of remaining chippings with compressed air or with a scriber.
6. New thrad cutting with a new tap
7. After finishing the new thread please test the size accuracy.
1-5 taps can be remove with one drill to remove jammed taps.
Regrinding of drills to remove jammed taps is not economical.
Due to the hexagon this drill can also be clamped in normal three- or
four-jaw chucks.
In case of correct use the core hole will not be damaged in all materials,
also in Cu or Al and hardened materials

Drill set to remove broken taps
on page 208

Example of order Available from stock 149
W9-900002-0250 On request
WDG 2,5 VHM AT