Tooling Systems

The KM tooling joint is an extremely rigid and stable system that is
specifically designed to supply consistent results. As with any
mechanical coupling, KM has limits that if exceeded could result in
mechanical damage to the joint and/or its components. To help you stay
within the limits of the KM joint, Kennametal has established maximum
safe tangential loads for each KM system size. These loads are
described as a certain amount of force at the standard “F” and “L1”
dimensions for each given KM system size.
Information shown on the following charts was developed by
Kennametal exclusively for use with KM tooling. Do not use these for
any other tooling system because the results will not apply.
Technical Information
KM Application Data - Operating Conditions
The following example illustrates how to use Charts 1, 3, 5 & 7.
Given: KM32 integral shank boring bar, ordering
code KM32-S25E-MCLNR4
Dimensions: L1 = 2.756 inches (70mm), F = 0.669 inches (17mm)
Required: What is maximum permissible tangential load?
Solution: To determine the tangential load:
a) Determine the correct chart to use.
(This is a KM32 tool, so it is Chart 1).
b) Find the intersection point of the 2 lines that
correspond to the dimensions L1= 2.756
inches (70mm). F = 0.669 inches (17mm). These 2
lines intersect just above the 1000 lbs. curve.
c) The permissible tangential load is the approximate
load at the point of intersection. The point of
intersection is at approximately 950 lbs.
As you can see from the calculation, the actual value is 974 lbs.
Small variations are to be expected due to “reading” the
approximate location on the chart, but should be inconsequential.
Safe cutting conditions are achieved when the actual tangential load
that is being put on the KM tooling does not exceed the maximum
permissible tangential force. To help you determine the approximate
value of your actual tangential force, Charts 2, 4, 6 and 8 have been
developed. They show the relationship between depth of cut and feed
rate at various tangential forces. They are recommended for use when
standard CNMG and TNMG insert geometries are being used to
machine plain carbon steels (AISI 1000 series), most alloy steels
(AISI 4000 series), and some tool and stainless steels (H11, 316).
The following example illustrates how to use Charts 2, 4, 6 and 8.
Given: KM32 integral shank boring bar, ordering code
KM32-S25E-MCLNR4
feed rate - 0.012 ipr
depth of cut - .200 in. (doc)
Required: What is approximate tangential force?
Solution: To determine the tangential force:
a) Determine the correct chart to use.
(This is a KM32 tool, so it is Chart 2).
b) Find the intersection point of the 2 lines that
correspond to the 0.012 ipr “feed rate” and the
0.200 “doc”. These 2 lines intersect just above
the 800 lbs. curve).
c) The approximate tangential force is the force at
the point of intersection. The point of intersection
is at approximately 820 lbs.
Please remember that these are just approximate values and should
be used only as a reference. If there is any doubt these charts are
accurate enough, then the actual cutting force should be calculated.
In summary, these charts were designed to be used with one another
as a guide for determining conditions that are within the limits of the
various KM tooling system sizes. However, in actual cutting conditions,
there are many other limitations such as insert strength or excessive
overhangs that may limit the cutting forces to values far lower than
those given in the charts.
KM SYSTEM
HSK SYSTEM
BT SYSTEM
CV SYSTEM
DV SYSTEM
QC / R8 SYSTEMS
STRAIGHT SHANK
COLLETS /
SLEEVES
INDEX TECHNICAL ACCESSORIES
To place an order, contact Kennametal or your authorized Kennametal distributor, or visit www.kennametal.com. 785