Sandvik Coromant Silent tools - How to reduce vibration in metal cutting - Manual (Page 21)

Sandvik Coromant – How to reduce vibration in metal cutting 17
Holding the bar
After choosing the boring bar material select the most suitable clamping
method for the machine in question.
Stability is the keyword to turn bores to the appropriate criteria such as
dimension tolerances and surface finish.
It is essential, for retaining satisfactory results, to clamp the cylindrical
boring bar in a split sleeve, as this will have maximum contact area. With
EasyFix sleeves the best possible clamping is achieved together with exact
centre height positioning.
Achieving correct centre height is one of the most important factors
towards gaining maximum benefit from the tool system used, as the centre
height affects the rake angle and cutting force on the tool.
Using screws directly in contact with the cylindrical boring bar will not
give satisfactory results and maximum performance of the boring bar will
not be achieved.
Clamping method Stability
Cylindrical boring bars in split sleeve: ++
Boring bars with flats: +
Coromant Capto boring bars: ++
Cylindrical boring bar with screw clamping: --
(-- = not recommended + = adequate, ++ = very good)
Practical tips:
• Use Coromant Capto for its efficient function, good stability and also
for the benefits of a quick change system.
• If you are using a cylindrical boring bar, always us split sleeves such as
EasyFix giving an exact centre height.
On Silent Tool boring bars it is important not to clamp on the dampening
part of the bar. For measurement information see the main turning cata-
logue and dimension l
4
.
Good clamping of boring bars is a very important factor in all turning