Owner's manual

30
2. Applications – Thread turnin
g
Radial clearance
To give adequate radial clearance, inserts are tilted in the tool
holder 10° or 15°.
It is important to use internal inserts with internal tool holders, and
vice-versa, to ensure that the correct thread form is achieved.
Insert sizes 11, 16 and 22 mm
(1/4, 3/8 and 1/2 inch)
Insert size 27 mm (5/8 inch)
Modi ed bars for small holes
Internal boring bars can be modi ed to  t small holes and can be
used in place of special tools. These modi ed bars retain their
rigidity, as long as the recommended minimum dimension D
min
is
retained – see main catalogue for further information.