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Cat. Nr.:
SUMOCHAM drill body Weldon shank DCN A, 8×D, Size: 21
Article no.: 2027222
Catalog no.: 231715
Article code:
- Version: 8×D
- Shank: ISO 9766
- Use for drilling: concave; convex; Cross drilling; Drilling through a stack
- Number of cutting edges Z: 2
- Through-coolant: yes
Product details
Technical Data
| Series | SUMOCHAM | |
| Version | 8×D | |
| Shank | ISO 9766 | |
| Use for drilling | concave; convex; Cross drilling; Drilling through a stack | |
| Number of cutting edges Z | 2 | |
| Through-coolant | yes | |
| Dia. range Dc | 21 mm - 21.9 mm | |
| Overhang L1 | 168 mm | |
| Shank ⌀ Ds | 25 mm | |
| Shank length Ls | 56 mm | |
| Pilot drill required | yes, pilot drill | |
| Iscar item designation | DCN 210-168-25A-8D | |
| Shank type | ISO 9766 | |
| Flute length Lc | 171.18 mm | |
| Manufacturer's designation | DCN 210-168-25A-8D | |
| Type of product | Insdexable Drill |
Identification & Classification
| Article number | 2027222 | |
| Catalog number | 231715 | |
| EAN / GTIN | 7291075291797 | |
| Manufacturer number | 3202599 |
Description
Version:
SUMOCHAM interchangeable head drilling system for highly efficient drilling with interchangeable drilling heads. Unique clamping mechanism for convenient fixing of the drilling head without additional clamping screw. Versatile material use due to comprehensive drilling head range. Optimum tool stability with twisted coolant channels for high concentricity and lowest possible axial run-out of the bore. Other available versions: base body with round shank, base body for machining chamfers on bores when a chamfer ring is attached, base body especially for use in multi-spindle, sliding headstock and production lathes.
Tolerance class: IT8-IT9, concentricity: 0.03 mm.
Tolerance class: IT8-IT9, concentricity: 0.03 mm.
Application:
Supplied with:
Drill body incl. assembly key for drilling heads.
Note:
- Always select a strategy with medium cutting speeds and high feed rates.
- No rapid traverse and no spindle anti-clockwise rotation during retraction.
- For drilling depths of 8×D and more, piloting of at least 1.5 × DC with
same cutter insert required. - Drilling convex / concave surfaces: Radius of curvature > 15 × DC required, reduce feed rate by up to 50%.
- For cross holes, the maximum permissible diameter is 1/4 of the nominal diameter DC.
- Stack drilling requires stable conditions, reduce gaps between workpiece elements.
- Oblique drill entry and exit up to 7° inclination possible with reduced feed rate (approx. 20 - 30%).
- Designation convention 8×D: DCN [size]-[L1]-[⌀DS]A-[L/D]
- Designation convention 12×D: DCN [size]-[L1]-[ØDS]R-[L/D]
- Examples:
No. 231715 6 DCN 060-048-12A-8D
No. 231720 8 DCN 080-096-12R-12D