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CoroMill® 331

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Handling instructions for CoroMill 331

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Settings

How to set the width on a full side and face milling cutter.

Working with large corner radius inserts

  • When adjusting cutter width (CW) within its lower setting range, the shape of the groove may receive a small notch at the intersection between the radius and the bottom
  • Tailor Made inserts with chamfer clearance are available to minimize the overlap and hence reduce vibration

Working with round inserts

For grooves deeper than IC/2, a 0.5 mm (0.020 inch) adjustment of each cassette is recommended

  • Widens groove 0.5 mm (0.020 inch)
  • Reduces contact length for each insert to 90˚
  • Produces a more favorable chip formation and evacuation
  • Reduces vibration and power consumption

View more instructions

Gang milling

  • Mount every other cutter with alternative key slot in a staggered mounting pattern so that corresponding inserts of adjacent cutter bodies are not aligned
  • Machines with flywheel mounted on the driving side of the arbor gives better stability

Position of key slots

There is only one keyway for adjustable tools with internal coolant if the number of teeth can be evenly divided by four, since the cutters are even pitch. For information regarding number of keyways, see product details.

Torque value

Wedge
Size DC (mm) Torque (Nm)
CM All dimensions 3
DM All dimensions 4, 5
EM, FM, KN DC < 110 6
EM, FM, KM, LM, RM, QM DC >= 110 7
EMQ, FMQ, KMQ DC < 110 6
EMQ, FMQ, KMQ DC >= 110 7
Insert

Size 04–08: 1.2 Nm (0.9 ft-lbs)
Size 11–14: 3 Nm (2.2 ft-lbs)

Application tips

Maximum chip thickness

For parting and grooving milling applications, the most important factor to keep in mind is the maximum chip thickness (hex).


• The engagement to cutter diameter ratio is always less than 30%


• Use optimum hex considering the ae/DC ratio in order to not operate at a too low chip thickness zone, rubbing the work piece instead of shearing


• Right hex value will ensure good cutting action with better surface quality and tool life

Grade selection

• Use PVD grades as first choice for grooving applications


• Use CVD grades as first choice for half side milling applications

Side and face milling checklist

Make the most out of your slot milling operations by applying these useful hints.

Reduce overlapping problems

• Use Tailor Made inserts with reduced cutting edge length


• Reduces wear in the overlapping zone


• Better chip control and reduced power consumption by up to 10%

Recommendations

Cutter body selection

  • The cutters are designed and named after their application area, for example full side & face, half side & face, back face.
  • For a required ar, use smallest cutter diameter for best stability
  • For a fixed diameter, use cutter with high zn for higher productivity

Full side & face cutter

Right-hand cutter
Right-hand cassette
Left-hand cassette

Half side & face cutter

Spindle rotation R Spindle rotation L
R style cutter
R331.52…R
R Cassette		 L style cutter
L331.52…L
L Cassette
R style cutter
R331.52…L
L Cassette		 L style cutter
L331.52…R
R Cassette
   
R style cutter
R331.52		 L style cutter
L331.52
L style cutter
L331.52		 R style cutter
R331.52


Cutting edge length

Smallest cutter width is always recommended when selecting full side and face milling cutter for grooving. Optimizing the overlap of two inserts is critical for stable machining.

 

Choice of cassette


Half side and face mill

Full side and face mill

Note: The cutter diameter, DC, will be 3.2 mm (0.126 inch) larger with the 8 edge square insert.



First choice insert

Full side & face milling

Roughing  M30 4330 L50 2040  M30 3040 WL H13A L50 S30T M30 1130
Medium M30 1130 L50 1040 M30 1020 NL H13A L50 S30T M30 1130
Finishing L50 1130 L30 1040 KL 1020 NL H13A L30 S30T PL S30T
P M K N S H

The recommendations are based on dry conditions for all material groups except for ISO-S where wet conditions are recommended. If wet conditions, consider a PVD coated grade.



Half side & double half side milling

Roughing PM 4330 L50 2040 KM 3330 WL H13A L50 S30T M30 4330
Medium M30 4330 L50 2040 M30 3040 NL H13A L50 S30T M30 1130
Finishing L50 1130 L30 1040  M30 1020 NL H13A L30 S30T PL S30T
P M K N S H

The recommendations are based on dry conditions for all material groups except for ISO-S where wet conditions are recommended. If wet conditions, consider a PVD coated grade.



Choice of geometries

Easy, good conditions Tough, bad conditions
Sharpness Toughness
H-NL L30 X-XL L50 M30 X-XM


Cutting data

Ordering code ISO material fz hex
Starting value Min.-max. Starting value Min.-max.
N331.1A-……E-L30
  • M
  • S
 0.06 (0.01‒0.08) 0.05 (0.01‒0.07)
N331.1A-……E-L50
  • P
  • M
  • S
 0.09 (0.02‒0.17) 0.08 (0.02‒0.15)
N331.1A-……E-M30
  • P
  • K
 0.14 (0.05‒0.20) 0.12 (0.04‒0.17)
N331.1A-…...x-NL
  • N
 0.12 (0.01‒0.17) 0.10 (0.01‒0.15)
N331.1A-…...x-xL
  • P
  • M
  • K
  • S
 0.12 (0.04‒0.17) 0.10 (0.03‒0.15)
N331.1A-...…x-xM
  • M
  • S
 0.12 (0.04‒0.17) 0.10 (0.03‒0.15)
N331.1A-...…x-xM
  • P
  • K
 0.17 (0.06‒0.29) 0.13 (0.05‒0.25)
R/L331.1A-……H-WL
  • M
  • S
 0.09 (0.02‒0.12) 0.08 (0.02‒0.10)
R/L331.1A-……H-WL
  • P
  • K
 0.12 (0.05‒0.17) 0.10 (0.04‒0.15)

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