Polski 
- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
Diameter50 mm
Entering angle75°
Depth of cutup to 9 mm
Inserts3 × SPKN 1203
75° Ø50 milling head – shell face mill for SPKN 1203 inserts
Technical data – Dolfamex 220.27-050, mounting bore 22 mm
| Technical data | |
|---|---|
| Head diameter D | 50 mm |
| Mounting bore d | 22 mm (H7) |
| Head height H | 40 mm |
| Max. depth of cut a | 9 mm |
| Entering angle | 75° |
| Number of inserts Z | 3 |
| Inserts | SPKN 1203, e.g., SPKN 1203 EDSR |
| Insert clamping | clamping screw 174 16-644 |
| Head type | 220.27-050 |
| Manufacturer | Dolfamex, Poland |
75° Ø50 milling head Dolfamex 220.27-050 is a shell face mill with three SPKN 1203 inserts. It face mills flat surfaces and chamfers side edges in steel and stainless steel. It removes up to 9 mm of material in one pass. The inclined insert edge splits the cutting force into two directions: radially and axially toward the spindle.
The head has a 22 mm bore with a transverse slot on the spindle side. It mounts on a face mill arbor, and the arbor drive keys transmit torque. Each insert has four cutting edges. When one becomes dull, rotate the insert by 90° and continue machining.
Head construction: pocket, SPKN 1203 insert, and clamping screw
Head components, insert designation, and replacement
The body has three teeth, each with a pocket for a square SPKN 1203 insert. The insert rests against two pocket walls. It is held down by the head of clamping screw 174 16-644, threaded in beside the pocket. The insert has no hole, so its cutting edge is continuous along its entire length. The drawing shows one pocket disassembled in removal order: screw, insert, wrench.
| No. | Part | Designation | Wrench |
|---|---|---|---|
| 1 | Milling head | 220.27-050 | – |
| 2 | Insert (3 pcs) | SPKN 1203 | – |
| 3 | Clamping screw (3 pcs) | 174 16-644 | 4 mm hex key |
| 4 | Hex key | 4 mm | – |
SPKN 1203 insert designation and selection
The head accepts SPKN 1203 inserts to ISO 1832. S denotes a square shape, and P a 11° clearance angle, indicating a positive insert. K is the tolerance class for inserts with ground facets, and N denotes an insert without a hole or chip breaker. The number 12 indicates a 12.7 mm edge, and 03 a thickness of 3.18 mm.
The size is followed by a group of letters, e.g., EDSR. E denotes a 75° entering angle, the same angle at which the head operates. D indicates a 15° wiper facet clearance angle. T and S describe the edge preparation, and R denotes a right-hand insert.
| Insert | Workpiece material | Grade |
|---|---|---|
| SPKN 1203 EDSR MTC Horn | steel, stainless steel | MTC, PVD coating |
| SPKN 1203 EDTR H8320 Horn | steel, cast steel | H8320 |
| SPKN 1203 EDTR YG612 YG-1 | steel, cast steel | YG612 |
Horn is a Korean insert brand available in our store. You can switch workpiece materials by changing only the insert – the head stays the same.
Replacing and indexing the insert
1Loosen the clamping screw with a 4 mm hex key
2Slide out the insert and remove chips from the pocket
3Rotate the insert 90° to a new edge
4Press the insert against the pocket walls and tighten the screw
✓New edge in operation
The insert has four edges, one at each corner. A clean pocket holds it level and without runout. Index all three inserts together so they cut at the same height.
Dimensions and mounting on a 22 mm arbor
Dimensional drawing, arbor, and head installation
The drawing shows the head in half-section and end view. The diameter across the insert corners is 50 mm, and the body height is 40 mm. The 22 mm bore has an H7 tolerance, so the head fits on the arbor pilot without play. The transverse slot, 10.4 mm wide and 6.3 mm deep, accepts the arbor drive keys. Dimension a = 9 mm is the height at which the insert cuts.
Mounting the head on the arbor
1Clean the arbor pilot, arbor face, and head bore
2Slide the head on so that the drive keys engage the slot
3Tighten screw 220.17-691 with a 6 mm hex key
✓Head ready for use
A face mill arbor with a 22 mm pilot and 10 mm drive keys is suitable, e.g., 7369 40-22-60 with an SK40 shank to DIN 69871-A or 7361 40-22-55 with a BT40 shank to MAS 403-BT. Screw 220.17-691 engages the M10 thread in the pilot and clamps the head against the arbor face. Other heads with a 22 mm bore can use the same arbor.
Face milling and edge chamfering – operation of the 75° head
Operations, cutting data, and spindle speed calculation
The SPKN 1203 insert edge is positioned in the head at a 75° angle to the face. The wiper facet near the corner produces a smooth flat surface. The inclined main cutting edge removes material over a height of up to 9 mm. This allows the head to face mill flat surfaces and chamfer the side edges of the workpiece. The drawings show the head movement and the material removed.
Face milling
The head passes over the workpiece at a shallow depth of cut. The facet near the insert corner smooths the surface. One pass removes a strip up to approx. 35 mm wide, or 70 % of the diameter. This method is used to face mill end faces, ledges, and casting surfaces.
Chamfering side edges
The head guides the inclined insert edge along the workpiece edge. This produces a chamfer at 15° to the side wall. Set its height using the axial depth of cut, up to 9 mm in one pass.
▲
Depth of cut up to 9 mm per pass
This is the height of the active cutting edge of the SPKN 1203 insert in this head. Remove larger stock allowances in several passes. Start each pass from the side of the workpiece.
Cutting data – starting values for 3 inserts
The table provides conservative starting values for face milling and chamfering with SPKN 1203 inserts. Spindle speed and feed rate are calculated for a diameter of 50 mm and 3 inserts. Start with these values and increase them while monitoring the chips and spindle operation.
| Workpiece material | Insert grade | Cutting speed vc [m/min] | Feed per tooth fz [mm] | Spindle speed [rpm] | Feed rate [mm/min] | Starting depth of cut ap [mm] |
|---|---|---|---|---|---|---|
| P Structural and alloy steel | MTC, H8320 | 150 (150–220) | 0.12 (0.10–0.22) | 950 | 340 | 3 |
| M Stainless steel | MTC | 90 (80–140) | 0.10 (0.08–0.18) | 570 | 170 | 2 |
Spindle speed and feed rate calculation – steel, 150 m/min
Spindle speed = 1000 × cutting speed 150 m/min ÷ (3.14 × head diameter 50 mm) ≈ 950 rpm. Feed rate = feed per tooth 0.12 mm × 3 inserts × 950 rpm ≈ 340 mm/min. Enter these two values in the machine program. At a 75° angle, the chip thickness is approx. 0.97 times the feed per tooth, so the values from the insert tables can be used directly.
75° Ø50 milling head Dolfamex 220.27-050 face mills flat surfaces and chamfers side edges in steel and stainless steel. It uses three SPKN 1203 inserts, each with four cutting edges. It mounts on a face mill arbor with a 22 mm pilot and removes up to 9 mm of material in one pass. The inserts are serviced with a single 4 mm hex key.
Questions about the Dolfamex 220.27-050 head
Arbor, inserts, chamfering, depth
A face mill arbor with a 22 mm pilot and 10 mm drive keys, e.g., 7369 40-22-60 with an SK40 shank to DIN 69871-A or 7361 40-22-55 with a BT40 shank to MAS 403-BT. The head is clamped by screw 220.17-691, tightened with a 6 mm hex key.
Right-hand SPKN 1203 inserts, e.g., EDSR or EDTR. SPKN 1203 EDSR in grade MTC from the Korean brand Horn is suitable for steel and stainless steel; EDTR H8320 Horn or EDTR YG612 YG-1 is suitable for steel and cast steel.
A chamfer at 15° to the side wall, or 75° to the top surface of the workpiece. Set the chamfer height using the axial depth of cut, up to 9 mm in one pass.
Up to 9 mm in one pass. For initial cuts, set a depth of up to 3 mm in steel or up to 2 mm in stainless steel. When face milling, use a cutting width of up to approx. 35 mm.
Product accessories
Reviews
No customer reviews for the moment.
Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
Recommended for you
Viewed products
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.