TopGroove ™
Machining Guidelines
Internal Groove Depth versus Bar Interference
minimum bore diameter
at maximum groove depth
maximum groove depth
NOTE: Internal grooving depth limits are a function of bar clearance versus bore diameters.
Machining Guidelines for Back Turning/Turning/Profi ling
The NP-K-style TopGroove inserts were engineered specifi cally for back
turning on small automatic lathes, but they also fi nd applications for other
light turning and profi ling operations. For general applications, maximum
depth of cut should not exceed 2,74mm for size 2 inserts or 3,84mm
for size 3 inserts.
Machining Guidelines for Using TopGroove Deep Grooving Inserts (NGD)
Typically, those NGD- and NRD-style inserts with two
cutting edges require no machine offset changes.
However, those inserts with only one cutting edge
do require offset changes. Refer to the chart here
to ensure proper offset adjustments.
add to C
dimension add to F
dimension
mm mm
NGD-3062 0,00 0,00
NGD-3094 2,54 2,54
NGD-3125 2,54 2,54
NGD-3189 2,54 2,54
NGD-4125 0,00 0,00
NGD-4189 3,18 3,18
NGD-4250 6,35 6,35
NRD-3031 0,00 0,00
NRD-3062 2,54 2,54
NRD-4062 0,00 0,00
NRD-4094 6,35 6,35
NRD-4125 6,35 6,35
insert
catalogue number
• All TopGroove inserts are precision ground
to provide accurate edge location and secure
locking of the insert in the toolholder pocket.
• TopGroove inserts can be used in either toolholders
or boring bars.
• Right-hand TopGroove toolholders use right-hand inserts.
Left-hand TopGroove toolholders use left-hand inserts.
• Right-hand TopGroove boring bars use left-hand inserts.
Left-hand TopGroove boring bars use right-hand inserts.
left-hand insert
widia.com
right-hand insert
E87
TopGroove Insert Selection Guide