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Description
Ø125 mm milling head – for face milling with TPKN 2204 inserts
Technical data and dimensions – Smoxh TK90P TP22, 40 mm mounting bore
| Technical data | |
|---|---|
| Head diameter D | 125 mm |
| Mounting bore d | 40 mm, transverse slot, B40 mounting |
| Head height L | 63 mm |
| Max. depth of cut a | 18 mm |
| Entering angle | 90 degrees |
| Number of inserts Z | 8 |
| Inserts | TPKN 2204, e.g., TPKN 2204 PPR |
| Insert clamping | TKBP 9116 wedge, TKSV M8x1x18 screw |
| Wrench for wedge screw | 5 mm hex key |
| Coolant supply | external |
| Head type | 220.17 – TK90P TP22 D125 B40 Z08 |
| Manufacturer | Smoxh, Turkey (SM32842) |
Diameter125 mm
Depth of cutup to 18 mm
Inserts8 × TPKN 2204
Coolant supplyexternal
Ø125 mm milling head Smoxh TK90P TP22 cuts at 90° with eight TPKN 2204 inserts. This head is designed for face milling and square shoulder milling. It machines steel and stainless steel. It removes up to 18 mm of material in one pass. The insert has three edges: when one becomes dull, index the insert and continue machining.
This is a type 220.17 milling head for metal with replaceable inserts. Instead of a shank, it has a 40 mm bore with a transverse slot. It fits onto a milling arbor, whose drive keys transmit torque. The inserts have no hole – each is held in its pocket by a wedge and screw. The body has no coolant channels, so coolant is supplied externally.
Head construction: pocket, insert, wedge, and screw
Head components and mounting on a milling arbor
The body has 8 pockets around its circumference. In each pocket, a TPKN 2204 insert rests against two walls. A TKBP 9116 wedge clamps it on the rake face, and a TKSV M8x1x18 screw pulls the wedge tight. The insert has no hole, so its cutting edge is continuous over its entire length. The drawing shows two pockets disassembled in removal order: screw, wedge, insert.
| No. | Part | Quantity | Designation | Wrench |
|---|---|---|---|---|
| 1 | Milling head | 1 | TK90P TP22 D125 B40 Z08 | – |
| 2 | Insert | 8 | TPKN 2204, e.g., TPKN 2204 PPR | – |
| 3 | Wedge (insert clamp) | 8 | TKBP 9116 | – |
| 4 | Wedge screw | 8 | TKSV M8x1x18 | 5 mm hex key |
| 5 | Hex key | 1 | 5 mm | – |
Mounting the head on a 40 mm arbor
1Clean the arbor pilot, arbor face, and head bore
2Slide the head on so that the drive keys engage the slot
3Secure the head to the arbor with its screw or clamp
✓Head ready for use
A milling arbor with a 40 mm pilot and drive keys matching the head's transverse slot is required. The keys engage the slot and transmit torque. B40 in the manufacturer's code identifies the mounting type for the head with a 40 mm bore. Varel 220.17 D125 and D160 heads have the same 40 mm bore, so all can be used on the same arbor.
TPKN 2204 inserts – material selection and replacement
Triangular inserts without a hole, three cutting edges
The head accepts TPKN 2204 inserts to ISO 1832. T denotes an equilateral triangle, and P denotes a 11° clearance angle, indicating a positive insert. K is the tolerance class for inserts with ground lands; N denotes an insert without a hole or chip breaker. The number 22 indicates the edge length in millimeters, and 04 indicates a thickness of 4.76 mm.
The drawing shows top and side views of the insert. The edge is 22 mm long, the inscribed circle is 12.7 mm in diameter, and the thickness is 4.76 mm. The insert has a short wiper land at each corner. In the head, this land lies parallel to the machined surface and finishes the floor. The long edge runs along the axis and produces the shoulder wall.
In the PPR designation, the first P denotes a 90° entering angle, the second P denotes a 11° wiper land clearance angle, and R denotes a right-hand insert. The head rotates clockwise, so it requires right-hand inserts with R at the end of the designation.
| Insert | Workpiece material | Notes |
|---|---|---|
| TPKN 2204 PPR HTC Horn | steel, stainless steel | HTC grade |
| TPKN 2204 PPR H8320 Horn | harder materials | improved H8320 grade |
Horn is a Korean insert brand available in our store. Smoxh permits any ISO-compliant TPKN 2204 insert in this head. You can therefore switch workpiece materials by changing only the insert, without replacing the head.
Replacing and indexing the insert
1Loosen the wedge screw with a 5 mm hex key
2Slide the insert out and clean chips from the pocket and wedge
3Rotate the insert 120° to a new edge
4Press the insert against the pocket walls and tighten the screw
✓New edge in operation
The insert has three cutting edges, one at each corner. A chip under the insert raises it in the pocket and causes runout, so clean the pocket at every change. Index or replace all 8 inserts together so they cut at the same height.
Face milling and 90° shoulder milling – head operation
What a milling head for TPKN 2204 inserts does
The TPKN 2204 insert is positioned in the milling head with its long edge along the axis. This edge produces a wall perpendicular to the floor. Only the short chamfer at the insert corner cuts on the face. The milling head is therefore used for two operations: face milling and 90° shoulder milling. The drawings show the milling head movement and the material removed.
Face milling
The milling head passes over the workpiece at a shallow depth of cut. The chamfer at the insert corner smooths the surface. One pass removes a strip up to approximately 88 mm wide, or 70 % of the diameter. This is how the milling head face mills end faces, ledges, and castings.
90° shoulder and contour
The long insert edge is parallel to the milling head axis. This produces a wall perpendicular to the floor. A shoulder height of up to 18 mm can be machined in one pass. Mill taller shoulders in several passes.
▲
The milling head cannot plunge into the material
The TPKN 2204 insert cuts on the face only with the chamfer at its corner. Do not enter solid material axially, by ramping, or along a helical path with this milling head – the body will contact the workpiece and overload the inserts. Start each pass from the side of the workpiece.
Cutting data – starting values for 8 inserts
Cutting speed, feed per tooth, spindle speed, and feed rate for a 125 mm milling head
The table provides conservative starting values for face and shoulder milling with TPKN 2204 inserts. Spindle speed and feed rate are calculated for a diameter of 125 mm and 8 inserts. Start with these values and increase them while monitoring the chips and spindle operation.
| Workpiece material | Insert | Cutting speed vc [m/min] | Feed per tooth fz [mm] | Spindle speed [rpm] | Feed rate [mm/min] | Max. depth of cut ap [mm] |
|---|---|---|---|---|---|---|
| P Structural and alloy steel | HTC | 150 (130–200) | 0.10 (0.10–0.20) | 380 | 300 | 4 |
| M Stainless steel | HTC | 90 (70–130) | 0.08 (0.06–0.15) | 230 | 150 | 2 |
Spindle speed and feed rate calculation – steel, 150 m/min
Spindle speed = 1000 × cutting speed 150 m/min ÷ (3.14 × milling head diameter 125 mm) ≈ 380 rpm. Feed rate = feed per tooth 0.10 mm × 8 inserts × 380 rpm ≈ 300 mm/min. Enter these two values in the machine program. In stainless steel, at 90 m/min, the spindle speed drops to approximately 230 rpm.
Ø125 mm milling head The Smoxh TK90P TP22 face mills flat surfaces and mills 90° shoulders in steel and stainless steel. It uses eight wedge-clamped TPKN 2204 inserts. It mounts on a milling arbor with a 40 mm pilot and uses an external coolant supply. The maximum depth of cut is 18 mm.
Questions about the TK90P TP22 D125 milling head
Arbor, inserts, clamping, depth
A milling arbor with a 40 mm pilot and drive keys that fit the transverse slot in the milling head. The keys engage the slot and transmit torque.
Right-hand TPKN 2204 inserts conforming to ISO, such as TPKN 2204 PPR. Grade HTC from the Korean brand Horn is suitable for steel and stainless steel, and H8320 for harder materials. Each insert is clamped by a TKBP 9116 wedge with a TKSV M8x1x18 screw.
The TPKN 2204 insert is triangular, has no hole, and has three cutting edges. A wedge holds it in the pocket, leaving the entire edge uninterrupted. The APKT insert has a hole for a Torx screw and two edges.
A shoulder height of up to 18 mm can be machined in one pass. Start with a depth of cut of up to 4 mm in steel and up to 2 mm in stainless steel. When face milling a wide surface, remove a strip up to approximately 88 mm wide.
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