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High Feed head - EXN03R for LNMU0303 inserts - FMB clip-on shank

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EXN03R-35-16-6T

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Product description

EXN03R High Feed Milling Head — LNMU0303 Inserts, FMB Mount

Rough machining · high feed rates · indexable inserts

EXN03R is a shell-mounted milling head for high feed roughing. It uses indexable LNMU0303 inserts to remove stock by the high feed method: shallow cuts with a suitable feed per tooth.

The 42CrMo steel body, with a hardness of 40–42 HRC, mounts on an FMB shell mill arbor. Select the cutter diameter, mounting bore diameter and number of insert pockets for your machining task and available holder.

1. How high feed milling works

High feed milling combines shallow cuts with high feed rates. The insert setting geometry promotes thin chips. This can allow a higher feed per tooth than many conventional operations, provided the conditions suit the insert and machining setup.

A greater proportion of the cutting force is directed along the tool axis towards the spindle. This can reduce lateral deflection at longer overhangs and assist stock removal in deeper pockets. Holder rigidity, workpiece clamping and effective chip evacuation remain important.

A high feed rate does not mean an unrestricted depth of cut. Assess feed per tooth, spindle speed, cutting depth and cutting width together. Productivity depends on the complete process.

2. Applications and workpiece selection

Stock removal and rough milling — high feed machining with shallow passes.
Pocket machining — removing material within the accessible machining space; for deeper pockets, consider holder reach and chip evacuation.
Machining at longer overhangs — using the high feed force direction with the most rigid practical setup.
Plunge milling — only after verifying the permitted entry method and conditions for the selected cutter–insert combination and preparing a suitable CAM strategy.

Select the workpiece application through the grade and geometry of the LNMU0303 insert. The body designation alone does not specify an insert coating, chipbreaker or maximum workpiece hardness. For selection, provide the material grade, hardness, clamping conditions and planned operation.

3. Technical specifications

Parameter	Value
Tool type	Shell-mounted high feed milling head for rough machining
Series	EXN03R
Inserts	LNMU0303; geometry designation in the series: LNMU0303ZER
Body material	42CrMo steel
Body hardness	40–42 HRC
Mounting	Shell mount on an FMB arbor
Cutter diameter D	Ø35–100 mm, depending on the size
Mounting bore diameter d	Ø16, Ø22, Ø27 or Ø32 mm, depending on the size
Number of insert pockets	6, 8, 10 or 12, depending on the size
Edges per LNMU0303ZER insert	4 usable cutting edges

40–42 HRC is the cutter body hardness, not the maximum workpiece hardness. Check the size selector for available combinations of diameter, mounting bore and pocket count. The ranges do not mean that every combination is available.

4. Size designation and FMB mounting

Example designation: EXN03R-63-22-8T. Its elements specify:

Designation element	Meaning	Value in this example
EXN03R	Cutter series	High feed for LNMU0303 inserts
63	Cutter diameter D	Ø63 mm
22	Mounting bore diameter d	Ø22 mm
8T	Number of cutter pockets / teeth	8

FMB denotes shell mounting. Match the milling head to a suitable arbor using the mounting bore diameter. The bore diameter d, rather than the outer diameter D, determines the basic arbor fit.

Also check the drive arrangement, axial retention, reach and clearance of the complete assembly. The size designation does not specify holder length or the working length of the assembly.

5. LNMU0303 inserts and pocket count

Four edges per insert and the cutter tooth count are separate values. An LNMU0303ZER insert has four usable cutting edges. When the working edge wears, another edge can be used if the condition of the insert allows it.

8T denotes eight pockets in the body. A cutter with a complete set of inserts therefore has eight populated teeth. The four edges of one insert do not all cut simultaneously in a single pocket.

When selecting inserts, check the full designation, geometry, grade and application conditions. A correctly matched insert must seat without being forced and be secured according to the requirements of its fastening arrangement.

Do not multiply the pocket count by four when calculating feed. Use the number of effective cutting teeth Z in the feed rate formula.

6. Selecting cutting conditions

Set speed and feed for the actual material, insert, diameter and setup rigidity. Monitor spindle load and chip formation, and assess changes in conditions through a machining trial.

Feed rate F = n × Z × fz, where n is spindle speed in rpm, Z is the number of effective cutting teeth, and fz is feed per tooth in mm/tooth. This relationship recalculates feed when speed or tooth count changes; it does not establish a permissible fz by itself.

Example for a Ø63 mm milling head:

Parameter	Example value
Spindle speed n	1000 rpm
Feed rate F	6000 mm/min
Depth of cut ap	0.8 mm
Width of cut ae	50 mm
Cooling in this example	Dry or compressed air

This is an example, not a universal set of starting conditions. It does not specify the workpiece material grade or insert grade. For Ø63 mm, 8 effective teeth and 1000 rpm, a feed rate of 6000 mm/min mathematically corresponds to fz = 0.75 mm/tooth. Verify the permissible conditions for the selected combination before use.

The example uses dry machining or compressed air. Select cooling and chip evacuation for the material and the recommendations for your insert. Do not interpret this example as a prohibition on coolant in every application.

7. Setup and machining practice

Check the body and pockets. Remove chips and contamination from seating surfaces. Inspect the inserts and their fastening components.
Check the holder assembly. Match the mounting diameter, secure the head correctly and keep overhang to the minimum needed for the operation.
Prepare the toolpath. Consider entry, exit, changes in engagement at corners, and clearance for the head and holder. Plunge milling requires a separate strategy check.
Provide chip evacuation. In pockets, check that chips do not accumulate in the cutting zone and get recut.
Plan rough stock removal and finishing separately. Select the head primarily for high feed machining; account for surface and accuracy requirements in the subsequent machining strategy.

8. Questions and videos

Does 8T mean eight edges per insert?

No. It means eight pockets / teeth in the body. An LNMU0303ZER insert has four usable cutting edges.

Is the head only for workpieces at 40–42 HRC?

No. This is the body hardness. Suitability for the workpiece material and hardness depends on the selected insert and process conditions.

Do all Ø63 mm heads fit the same arbor?

The outer cutter diameter is not sufficient for selection. Check the mounting bore diameter and mounting design; in the example designation, the Ø63 mm head has a Ø22 mm bore.

Can the 6000 mm/min example be used for every size?

No. Feed depends on spindle speed, effective tooth count and permissible fz, among other factors. The example does not specify every machining condition.

What information is needed to select a head and inserts?

Provide the workpiece material and hardness, machining area dimensions, available FMB mounting, required reach, machine and planned stock removal strategy.