The document provides tips for successful parting and grooving operations. It recommends using tools with over- and under-coolant to control chips, wear, and temperature. Quick change systems and smart clamping solutions can minimize tool change time and avoid errors. When parting off, reduce feed rate near the part falling off, maintain center height tolerance, and turn off coolant at the rpm limit. For face grooving, start on the largest diameter and work inward in multiple cuts, use side turning when possible, and use the highest coolant pressure to improve chip control and evacuation.

1. Tips for Successful
Parting & Grooving

2. Tips for Parting & Grooving
Always use tools with
over- and under coolant
Over- and under coolant helps to
control chips, wear and
temperature for prolonged tool life,
stable performance and improved
surface finish.
Use tools with smart
clamping solutions
Use tools with smart clamping
solutions for easier insert changes
and to avoid errors caused by
human mistakes.
Use quick change systems
Quick change systems minimize the
time spent on tool change.
A good start: first choice
recommendations
If not sure which insert to use, our
first choice recommendations give
you a good and secure option to
start with.

3. Improve tool life when parting off
Reduce feed rate, fn
Always reduce the feed rate
by up to 75% around 2 mm
(0.08 inch) prior to the part
falling off.
Maintain centre
height
When parting bars it is
essential that the centre
height setting is maintained
to a tolerance of ±0.1 mm
(0.004 inch). Below centre
causes increased pip and
breakage, Over centre
causes breakage and rapid
flank wear.
Turn off coolant at
centre
Turn off the coolant when
the machine reaches the
rpm limit, to avoid build up
edge (BUE). Especially in
stainless steel. The rpm
limit is normally when
speed drops below 100
m/min (328 ft/min).
Use shortest
possible overhang
Always set up the tool
with shortest possible
overhang. Max
recommended overhang
8–10 × insert width.
Stop before centre
Stop the parting operation
before reaching the centre,
the component will fall off
anyway. Or use the sub
chuck to pull it off.

4. Strategies for face grooving
Start roughing on the
largest diameter and
work inwards
Always start on the largest
diameter (1) and work inwards.
Further cuts (2, 3) should be
0.5-0.8 × insert width.
Perform finishing in three
separate cuts
To get chip control when finishing is tricky,
especially when it comes to machining of
fillets. It is important to separate the
material to be removed by making 3 cuts.
Make the first axial cut close to the corner
radius on the largest diameter. Start the
second cut on the largest diameter and
machine to the corner radius on the inner
diameter. The third cut finishes the inner
diameter and the corner radius.
Use side turning
whenever possible
Side turning provides better chip
control. Try to use this method
for face grooving whenever it is
possible. Start on the largest
diameter and machine towards
the centre.
Use the highest possible
coolant pressure
Use face grooving tools with high
precision coolant supply even if the
maximum coolant pressure in your
machine is low. It improves chip
evacuation and decreases the risk
of chip jamming in the groove. Use
the highest pressure of coolant as
you can (up to 80 bar (1160 psi)) to
get better chip control and
evacuation.

5. With higher pressure comes
better chip breaking
150(2200)
bar(psi)
70(1000)
bar(psi)
35(500)
bar(psi)
7(100)
bar(psi)
fn:0.06(0.002)
mm/rev(in/rev)
fn:0.09(0.004)
mm/rev(in/rev)
fn:0.12(0.005)
mm/rev(in/rev)
fn:0.1(0.006)
mm/rev(in/rev)
fn:0.18(0.007)
mm/rev(in/rev)
Operation Grooving, 15 mm depth (0.591
inch)
Component Valve
Workpiece material Steel 02.1 (SS2541)
Insert QD-NH-0400-0004-TF 1125
Cutting data
vc m/min (ft/min) 140 (459)

6. Click here for more
Parting & Grooving tips, tricks and information:
www.sandvik.coromant.com/parting-grooving-tools