gefran I3 Series Instruction Manual page 5

Drilling kit
A drilling kit with formed tools for drilling, reaming and tapping is available to facilitate correct preparation of
the assembly seat. The assembly seat must be perfect to assure proper transducer function and long lifetime.
Drilling kits are available in the following versions: KF12, KF18.
Drilling procedure
1) To drill hole (D4) up to a distance from the hole equal to the sum of (A+B+C) (tool 3).
2) Make the pass through hole (D2) by the tool 1.
3) To create the seal seat at a distance from the hole equal to dimension (A) (tool 4).
4) With a roughing tap, create threading 1/2-20UNF-2B (recognizable from the greater number of threads
beveled at the mouth) (tool 5).
5) With a finishing tap, go over threading 1/2-20UNF-2B up to a distance from the bottom equal to the sum
of (A+B) (tool 6).
6) To ream the hole (D2) with reamer (tool 2).
Installation seat check
The dimensions of the assembly seat have to be checked after preparation and before the transducer
installation.
Use dummy plug SC 12/18 as follows:
1) Coat the end of the rod with the appropriate ink.
2) Lubricate the threaded part to prevent friction.
3) Insert the dummy plug and screw it fully down.
4) Remove the rod and examine it.
With the exception of 45° surfaces, the ink should be intact on the entire surface .
DRILLING TOOL KIT
VERSION
CODE
THREADING
TYPE
1
2
3
4
5
6
CORRECT SEAL
80175G_MAN_I3-IE-IN-IX_I7_11-2018_ENG
KF12 KF18
1/2-20UNF-2B M18x1.5
Ø 7.6 Ø 9.75
Ø 7.95 Ø 10.1
Ø 13 Ø 20
Ø 11.5 with Ø 16 with
pilot guide pilot guide
1/2-20UNF-2B M18x1.5
roughing roughing
1/2-20UNF-2B M18x1.5
finishing finishing
contact surface
CORRECT INSTALLATION
WRONG
WRONG
WRONG
CORRECT
5