Slim 90° Right Angle Head (DK90-BT50 DC Collet Series)

Key Technical Features and Material Standards

• Ultra-Compact DC Pull-Back Collet System: Features a draw-in DC collet mechanism that eliminates wide external clamping nuts. This design slims the maximum head swing diameter down to D35 mm (DC6) and D40 mm (DC5M), providing cutter clearance in narrow deep-wall channels.
• Heavy-Wall QT500-7 Ductile Iron Housing: Cast from high-grade QT500-7 Ductile Iron and subjected to artificial aging and stress-relief heat treatment. The monoblock casing absorbs high cutting vibrations during extended gage length operations up to 185 mm.
• Gleason Precision Ground Bevel Gears: Manufactured from 20CrMnTi Alloy Steel, gas-carburized and quenched to HRC 58-62, and ground to ISO Grade 4 precision on Gleason CNC grinders. Delivers transmission backlash ≤ 15 arcmin and running noise ≤ 70 dB under full operational load.
• Preloaded High-Capacity Bearings: Supported by preloaded, high-precision P4 class angular contact ball bearings (NSK/FAG) arranged to absorb axial thrust forces and radial cutting loads during heavy side milling.

2D/3D Technical Drawings and CAD Download Center

BT50-DC6-66

BT50-DC7-52

BT50-DC7-120

BT50-DC8-160

BT50-DC10

BT50-DC13

BT50-DC16

Technical Specifications

Quality Assurance and Testing Standards

Before dispatch, every DK90-BT50 DC series angle head undergoes a 100% Quality Inspection Protocol:

• Static and Dynamic Runout Test: Spindle taper and DC collet cone runout are checked with a high-precision dial indicator, held to ≤ 0.005 mm at the spindle nose and ≤ 0.015 mm at 4D distance.
• 60-Minute Continuous Run-In: Tested continuously at full rated operational speed for 60 minutes. Housing temperature rise must remain ≤ 25°C above ambient temperature.
• Anti-Backlash Calibration: Verified with angular encoders to confirm transmission backlash remains ≤ 15 arcminutes under rated load.

Target Industries and Industrial Applications

• Heavy Die and Mold Manufacturing: Roughing and finishing deep internal cavities, slider guides, and angled ejector pin channels in large forged steel mold blocks (S45C, H13, NAK80).
• Heavy Machinery and Gearbox Housings: Processing internal bore features, seal rings, and side mounting faces on large cast iron turbine housings, pump bodies, and gearbox enclosures.
• Aerospace and Defense Structural Parts: High-feed deep pocket side milling and thread milling on large structural frames made of aerospace-grade aluminum or titanium forgings.

CNC Machine Compatibility

Optimized for large Vertical Machining Centers (VMC), Horizontal Machining Centers (HMC), and Gantry Milling Machines. Compatible spindle shanks include:

• Spindle Standards: BT50 / BBT50 (Double Contact) / SK50 / CAT50 / HSK100A.
• Typical Machine Brands: Compatible with Mazak, Haas, Okuma, Doosan / DN Solutions, Makino, and JTEKT / Toyoda machine tools.

B2B Industrial Packing and Shipping Standards

• Anti-Rust Protection: Coated with heavy-duty anti-rust oil and vacuum-sealed in a high-barrier VCI (Vapor Corrosion Inhibitor) bag accompanied by industrial desiccant packs.
• Shock Absorption: Cradled inside custom-contoured, high-density polyurethane protective foam inserts to isolate the BT50 taper and long housing from transport shock.
• Export Outer Casing: Due to the heavy unit weight (up to 18.200 kg), each unit is packed in an ISPM 15-compliant, Fumigation-Free Plywood Wooden Case with reinforced metal edge locks.
• HS Code: 8466.10.10.00 or 8466.30.00.90.
• Lead Time: Standard models are shipped within 5-7 working days. Custom positioning blocks are shipped within 15-20 working days.
• Shipment Ports: Shanghai / Ningbo / Tianjin Port, China.
• Incoterms Supported: FOB, CIF, EXW, FCA, DDU, DDP.
• Express Delivery: Shipped via international air freight or ocean LCL/FCL containers depending on weight requirements.

Technical Setup and Stop Block Alignment Guide

codeText

       ┌──────────────────────────────────────┐
       │     MACHINE TOOL SPINDLE FACE        │
       └──────────────────┬───────────────────┘
                          │ (Spindle Centerline)
                          │ 
                          ▼◄──────  G  ──────►[STOP BLOCK]
                       ┌─────┐                    │
                       │Taper│                    │ (Locking Bore)
                       └─────┘                    ▼
                          │               ┌───────────────┐
                     ┌────┴────┐          │ Positioning   │
                     │  Body   ├──────────┤ Pin (D18/D20) │
                     │  Casing │          └───────────────┘
                     └─────────┘

1. Stop Block Mounting: Securely bolt the heavy-duty stop block to the front face of the VMC or HMC machine spindle.
2. Verify Center Distance (G-Dimension): Confirm that the center-to-center distance between the machine spindle and positioning pin socket matches your ordered G-Distance (commonly 80mm, 110mm, or 135mm on BT50 machines).
3. Indicate Side Runout: Chuck a ground test arbor into the DC collet. Sweeping a dial indicator along the arbor horizontally, adjust the stop block’s locking bolts until parallelism is aligned within 0.015 mm per 100mm.
4. Confirm ATC Clearances: Run a manual tool changer (ATC) test cycle at low speed to verify the automatic arm smoothly grabs, seats, and releases the BT50 taper without physical interference.

Technical FAQ