Technical Information
Setup Recommendations
Setup Information and Recommendations
Tool “D” (above centreline)
Set ØB is defl ected to position “DF,” relieving the
load by defl ecting to a smaller bore, ØA. Tool “D”
cannot “dig in” because the cut (load) becomes
lighter as it defl ects.
Tip of the Insert
This enables the end user to hold closer tolerances,
produce a better f i nish, and avoid chatter.
Tool “E” (on centreline or below)
Set ØB “digs in” and is defl ected toward position
“EF” and bore ØC. The larger the load, the larger
the defl ection.
ØA
ØB
ØC
D
DF
E
EF
Built-in geometries of WIDIA-CIRCLE ™ precision
boring bars are based on the concept that the
boring bar shank will always be positioned on
the machine spindle centreline. The cutting point
will be slightly high (against direction of rotation)
except when facing centreline or cutting on
outside diameters.
Use WIDIA-CIRCLE precision setup level or:
0,25mm REF.
Machine Spindle
Boring Bar
Slant Bed Machines
1. Use centre height gage and position insert as
shown in illustration.
2. If centre point is unavailable, mark the centre of
the bar stock with a centring punch or square.
Position the insert as shown in illustration. 0,25mm REF.
(insert parallel to turret travel)
3. Lay a straight edge on the insert to help position
the insert parallel to the travel or centreline. Centre of Spindle
widia.com
D87
NOTE: In some cases, to help reduce
chatter or taper, the insert may
need to be rotated less than
0,25mm but more than
0,05mm above centre.