BIG KAISER High Performance Tooling Solutions 2018-2019

ROUGH BORING HEADS
ROUGH BORING GUIDELINES
Insert Selection & Stock Allowance
KAISER indexable inserts outlined in the Insert Selection
& Cutting Data tables have been selected to give
optimum results. Grades and geometry do not have
to be specified at time of order.
Insert radius is based upon 2 major factors:
1. Length/Diameter ratio of tool
2. Depth of cut or material allowance
• Select the largest nose radius available for
cutting edge strength & higher feeds
• Use small nose radius for light depth of cut &
extreme L/D ratio
Insert
Radius
Minimum
D.O.C.
• D.O.C. is stock allowance/side (radius)
Maximum
D.O.C.
L/D Ratio
.008 (0) .010 .060 >6:1
.016 (1) .020 .120 ≤5:1
.031 (2) .040 .200 ≤4:1
.047 (3) .060 .325 ≤4:1
Feed
1. Feed: Based on effective number of inserts,
depending on roughing method
• Balanced Cutting: 2 effective inserts
• Stepped Cutting: 1 effective insert
• Full Profile Cutting: 1 effective insert
2. Under normal rough boring operations, the effective
feed rate is about 50% of nose radius
Nose
Radius
Balanced Cutting
Feed/IPR
Stepped Cutting
.008 (0) .008-.012 .004-.006
.016 (1) .014-.016 .006-.008
.031 (2) .020-.026 .012-.016
.047 (3) .020-.030 .012-.020
B.1
ROUGH BORING
Power Consumption
The power curve of the machine should be consulted
and cutting data values adjusted accordingly.
• HP Requirements = MRR x K
• MRR = d x SFM x IPR x 12
• MRR = metal removal rate, inches3
• d = radial depth of cut, inches
• SFM = surface feet/minute
• IPR = inches/rev
Material
K Factor*
Steel .750
Alloy Steel 1.000
Cast Iron .650
Aluminum .430
High Temp Alloys 2.000
*With positive cutting geometry only
General Rule:
Boring bar should always be smaller than original hole size.
CAUTION
!
It is very important to allow for clearance between boring bar
and rough bore diameter.
L2
øD2
Depth of Cut
øD1
øD3
410
Chip Evacution
Space
L1