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Description
Angle to the axis62°
Diameter range14–40 mm
Inserts3 × TCMT 16T304
Length100 mm
Indexable countersink 14x40 mm – 62° chamfer mill for 3 inserts
Technical data and dimensions – 20 mm Weldon shank
| Technical data | |
|---|---|
| Cutting edge angle to the axis | 62° (124° cone) |
| Minimum diameter D2 | 14 mm |
| Maximum diameter D1 | 40 mm |
| Max. cutting depth | 6.9 mm |
| Flute length l | 40 mm |
| Overall length L | 100 mm |
| Shank diameter d | 20 mm, Weldon |
| Number of inserts Z | 3 |
| Insert | TCMT 16T304 |
| Insert screw | M3.5x10, Torx T15, 2.7 N·m |
| Manufacturer | Smoxh, Turkey (HF62 TC16 D14-40) |
Indexable countersink 14x40 mm Smoxh chamfers hole and slot edges at 62° to the axis. It cuts with three TCMT 16T304 inserts over diameters from 14 to 40 mm. Each insert has three cutting edges. A dull edge is replaced by rotating the insert through 120°, without resharpening the tool.
The 62° angle is measured between the insert edge and the tool axis. As the inserts rotate, they sweep out a 124° cone. For every millimeter of plunge depth, the diameter increases by 3.76 mm. The chamfer is shallow and wide: 1 mm of depth corresponds to approximately 1.9 mm of width. The feed per revolution is distributed across 3 cutting edges. The 20 mm shank has a Weldon flat for the holder screw, which locks the tool in the holder.
Applications – hole and slot chamfers at 62°
62° chamfer mill operations
The tool chamfers edges at 62° to the axis. A hole is chamfered with an axial movement, while a slot is chamfered by feeding along the slot. The same insert edges cut in both operations. The countersink machines holes and slots wider than 14 mm.
Hole edge chamfer
The countersink plunges axially into a hole larger than 14 mm. The inserts chamfer the edge at 62° to the axis. The chamfer width is set by the plunge depth. Each millimeter of downward travel adds 3.76 mm to the chamfer diameter, up to 40 mm.
Chamfer on both slot edges
The tool is guided along the center of a slot from 14 to 40 mm wide. The inserts chamfer both upper edges in a single pass. Chamfer width is set by the plunge depth. This method is used to chamfer keyway and guideway edges.
Hole chamfer – depth and diameter
How deep to plunge to obtain the required chamfer
The countersink cuts from a diameter of 14 mm to 40 mm. At an angle of 62° to the axis, the diameter increases by 3.76 mm for each millimeter of downward travel. The maximum plunge depth is 6.9 mm, at which the chamfer reaches a diameter of 40 mm. This range accommodates clearance holes for M14–M36 screws according to ISO 273, medium series.
Calculator: Z-axis plunge depth for chamfer diameter
Plunge depth is measured from the workpiece surface to the insert corners at a diameter of 14 mm. Plunge depth = (chamfer diameter − 14 mm) ÷ 3.76, e.g., (27 − 14) ÷ 3.76 ≈ 3.46 mm. The value 3.76 is the diameter increase per 1 mm of plunge depth at an angle of 62°.
▲
Hole wider than 14 mm
The countersink cuts from a diameter of 14 mm, so the chamfer extends around the entire circumference of a hole wider than 14 mm.
TCMT 16T304 inserts – three edges and indexing
Triangular insert to ISO 1832, Torx T15 screw
The insert code is interpreted according to ISO 1832. T indicates a triangle, so the insert has three cutting edges. C indicates a 7° clearance angle: the insert has positive geometry and cuts freely. M is the tolerance class, and the next T indicates a countersunk screw hole and a chip breaker on one side. 16 indicates an edge of approx. 16.5 mm, T3 a thickness of 3.97 mm, and 04 a corner radius of 0.4 mm.
The insert's 60° angle does not determine the chamfer angle. The 62° angle results from the insert's position in the body. The store offers the TCMT 16T304 H6310 insert from the Korean brand Horn. Grade H6310 is a general-purpose grade for steel and stainless steel. We sell the countersink without inserts; a complete set requires 3 pcs.
Changing edges step by step
1Loosening the screw
Key: Torx T15
2Indexing the insert
Rotation: 120°
3Cleaning the insert seat
Chips: removed
4Tightening the screw
Torque: 2.7 N·m
✓Remaining inserts
Repeat: steps 1–4
M3.5x10 screw and T15 key according to the Smoxh catalog
All inserts are indexed at the same time because they cut on the same cone. A chip under an insert shifts its cutting edge and changes the chamfer diameter, so the insert seat must be cleaned before each installation.
Cutting data – starting values
Cutting speed and feed per tooth – conservative ranges
The ranges are based on milling with an entering angle of 45° according to ISO 513. At an angle of 62°, these are starting values: begin at the lower limit and increase the values while monitoring the chips and spindle sound.
| Workpiece material | Cutting speed vc [m/min] | Feed per tooth fz [mm] |
|---|---|---|
| P Structural and alloy steel | 150–220 | 0.10–0.22 |
| M Stainless steel | 80–140 | 0.08–0.18 |
| K Gray cast iron | 180–300 | 0.10–0.28 |
Calculating spindle speed and feed rate – Ø 40 mm chamfer in steel
Spindle speed is calculated for the largest diameter engaged in the material, here the full chamfer diameter of 40 mm. Spindle speed = 1000 × cutting speed 150 m/min ÷ (3.14 × diameter 40 mm) ≈ 1190 rpm. Feed rate = feed per tooth 0.10 mm × 3 inserts × 1190 rpm ≈ 350 mm/min. These two values are entered into the machine tool program.
Higher spindle speeds and lighter pressure work well for countersinking. Low speeds with heavy pressure cause vibration. When machining stainless steel, coolant protects the hole edge from overheating.
Indexable countersink 14x40 mm Smoxh chamfers holes and slots at 62° to the axis. The diameter range is 14–40 mm, and the maximum plunge depth is 6.9 mm. It cuts with three TCMT 16T304 inserts, each with three edges. The 20 mm Weldon shank prevents the tool from rotating in the holder.
Questions about the 14x40 indexable countersink
Chamfer, inserts, depth, CNC program
An angle of 62° to the axis produces a 124° cone. A chamfer at this angle is machined when specified on the workpiece drawing.
TCMT 16T3 inserts to ISO, e.g., TCMT 16T304 with a 0.4 mm corner radius. The store offers TCMT 16T304 H6310 Horn for steel and stainless steel. The insert is secured with an M3.5x10 screw with a Torx T15 socket.
Three TCMT 16T304 inserts, one in each seat. Each insert has three edges. A set of 3 inserts provides three usable edge positions.
Enter a 124° countersink with a tip diameter of 14 mm in the tool table. Measure the tool height to the insert corners. Plunge depth = (chamfer diameter − 14 mm) ÷ 3.76.
Product accessories
Carbide insert TCMT 16T308 H6310 Horn
Reference: 0000006146 In stock > 10 items
€3.68
€4.53 brutto
Carbide insert TCMT 16T304 H6310 Horn
Reference: 0000007829 In stock > 10 items
€3.68
€4.53 brutto
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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 |
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