CoroMill® 331

Multi-purpose side and face milling cutter

Overview

How to use

Success stories

Assortment

Handling instructions for CoroMill 331

View and download here

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

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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 (h_ex).
• The engagement to cutter diameter ratio is always less than 30%
• Use optimum h_ex considering the a_e/DC ratio in order to not operate at a too low chip thickness zone, rubbing the work piece instead of shearing
• Right h_ex value will ensure good cutting action with better surface quality and tool life

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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.

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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 a_r, use smallest cutter diameter for best stability
For a fixed diameter, use cutter with high z_n 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