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Turning Milling
Cutting
speed
m/min
Rotation
Rev/min
Chip Removal
Rate
3
cm /min
Cutting
time
in min
Surface
roughness
um
Symbol Designation Unit
Dm
f
lm
n
Q
Amax
r
Tc
3
Machining diameter
Feed
Machining length
Rotation
Chip Removal Rate
d.o.c x feed
Nose radius
Cutting time
Vc =
n =
D m x J x n
1000
V c x 1000
Dm x J
Q = Vc x ap x f
Tc =
Rmax =
lm
f x n
f 2x
n
x 125
r
3
mm
mm
mm
rev/min
3
cm /min
mm
mm
min
2
Technical Formulas
Cutting
speed
m/min
Rotation
Rev/min
Table feed
mm/min
Cutting
output
3 cm / min
Feed
per
rotation
Symbol Designation Unit
Vc
ap
ae
D
fz
K
Vf
Z
Cutting speed
Depth of cut
Radial depth of cut
Cutter diameter
Feed per tooth
Feed rate
Number of teeth
®
Vc =
n =
n x J x D
1000
V c x 1000
J x D
Vf = n x z x fz
Vf = n x K x fz
Q =
f = Z x fz
f = K x fz
ae x ap x Vf
1000
m/min
mm
mm
mm
mm/tooth
Actual number of teeth for calculation
feed rate of feed per revolution.
mm/min
No.
Frequently Asked Questions
Is it true that Lamina inserts can really be run in
any type of work-piece material?
Lamina inserts have been run on thousands of jobs
the world over and will work practically any type of
turning or milling metal cutting operation. Please
note that, while Lamina inserts will work in Aluminium
– often production jobs in Aluminium will require
inserts with a geometry designed specifically for the
chip control needed with Aluminium. Please see
Lamina Alu-Line.
What speeds and feeds should Lamina inserts be
run at?
Adjacent to each insert ordering info page in this
catalogue, are specific data recommendations for
each individual insert showing the speeds and feeds
for almost every material group. In order to get the
maximum benefit from Lamina’s grade technology it
is important to always run the inserts at the
recommended cutting data. In general – the best
results are normally found at the higher end of cutting
speeds shown.
Will Lamina grades actually run better than the
hundreds of specialized “dedicated” grades
available from other suppliers?
Lamina has extensive know-how in sub-micron
powder technology as well as in sophisticated PVD
coatings. This know-how combines with chip breaker
geometry and application knowledge in order to
perfect our world class offering. Customers that
machine at the high performance speeds and feeds
we recommend – and use sound machining
techniques – continually reports superior results, in
virtually all materials, and are able to replace the
hundreds of confusing insert choices they previously
used.
Even in the applications where a Lamina insert runs
“about the same” as the existing insert – the Lamina
solution is still a better choice – because the same
Lamina insert can be used on the next job and the job
after that, and so forth. That’s the Lamina Multi-Mat
technology advantage.
What can we expect regarding the quality and
consistency of Lamina inserts?
Due to Lamina’s unique production methods and
Quality Control processes, you should expect inserts
with much higher accuracy than you are used to. You
can also expect inserts with maximum consistency
from edge to edge, insert to insert, box to box and
batch to batch – which offers you the ability to
maximize unattended operation of your machines.
What percentage of my indexable tooling
requirements can Lamina supply?
For most typical shops, Lamina’s insert program should
cover about 80% of all inserts needed for CNC
machines from 20 Hp and down. The insert program
covers a full range of standard turning and milling
operations from finishing up to and including medium
roughing.
In shops that run Lamina inserts now – what do
they find are the biggest benefit
- Ability to always have the right insert available
immediately when they need it.
- Tremendous savings in the cost of specifying inserts,
ordering processes, and stocking procedures.
- Simplicity and efficiency of being able to attack the
job knowing that there is no longer a need to worry
about having the right grade of insert.
- Machinists become very familiar with the grade
performance and application and are able to use the
inserts to their maximum usable life.
Are Lamina inserts coated the same as other PVD
inserts?
Lamina’s unique PVD coating has significant
differences compared to normal PVD coating used on
other inserts. The Lamina coating process impacts a
much stronger coating – with far better adhesion –
which results in the ability to machine at higher
speeds, with longer tool life, and in the widest variety
of materials.
What about turning tool holders and boring
bars?
Lamina’s ANSI / ISO standard turning inserts are
designed to fit all industry standard turning tools
and boring bars – so you can keep on using the
holders you have already invested in.
In turning – when should I use the _NMP style
inserts compared to the _NMG style inserts?
Most customers find that high-Positive _NMP style
inserts (CNMP, TNMP and WNMP) deliver the best
result in materials with high heat and corrosion
resistant properties. Typical materials in these
categories are 300 Series Stainless steels, Inconels,
and Titanium. The free cutting action of _NMP
inserts offers lower cutting forces and reduces the
work hardening effect.
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