Manual
34
10 xBD4xBD
BD
3. Turning
Boring bars – general
• Surface nish of ~1 µm is required to ensure sufcient clamping
contact
• Recommended clamping length is 4 × BD. If possible, we recom-
mend using a clamping length of 6 × BD for boring bars over 200
mm (7.87 inch)
• Cylindrical boring bars in split sleeves. Recommended clamping
tolerance is ISO H7
• Split bushing material, minimum 45 HRC to avoid permanent
deformation
• If a large bar, use a double bearing cap
• For best clamping stability use a split boring bar holder
Let the design and dimensions of the component decide the dia-
meter and length of the boring bar. For best clamping stability, rst
choice is Coromant Capto coupling or split sleeves. The diameter
of the bore and the length needed to reach the bottom will indicate
what type of boring bar to use.
1-1,5 x BD