Modular screw coupling
The modular screw coupling interface provides many benefits for milling and boring. For smaller machines removing the need of a chuck allows for shorter gauge lengths which dramatically reduces vibration. For long overhangs the shank material and shape can be optimized easier compared to solid tools.
For milling, longer solid carbide tools are costly and when only the end is used the tool costs can be significantly reduced.
Machine interface adaptors
Used mainly for small and medium machine spindles (HSK40/50/63 - steep taper #30, 40 - C3/C4/C5/C6). All other chucks build length into the assembly. Reduce the gauge length below three times the flange contact to reduce vibration and increase productivity.
Cylindrical – steel/solid carbide
The length of shank is selected to best provide the stick out length from the chuck. Steel is used up to 3×D and solid carbide up to 8×D.
Conical – steel/solid carbide
The conical shape has a big impact for stability. Conical should always be used where clearance allows and for 5-axis machining. Replacing conical solid carbide end mills has a big impact on tooling costs. Conical shanks exist in cylindrical shanks as well as Coromant Capto® for steel.
G undersized shanks – heavy metal
Over three times the shank diameter vibration is always an issue. Optimizing the stick out length to the absolute minimum required makes a difference. The G undersized shanks are 0.3 mm (0.012 inch) smaller than the cutting diameter and used in combination with dedicated collets for hydraulic chucks the shank length can easily be modified. Their application area is from 3–6 times the shank diameter.
Cylindrical shank with square drive for tapping
The tap adaptors are designed for tapping operations in machines equipped with automatic tool change. A construction for pull and pressure compensates for differences between spindle feed and thread pitch. Even micro differences between calculated feed and actual pitch of the tap can lead to extremely high thrust forces on the tap flanges and an increase in cutting pressure. When threading with a tap, with cylindrical square shank, it is important to use a tap adaptor with the same size as the shank/square.
Synchronized tapping chucks
Synchronized tapping chucks, like
CoroChuck® 970, are based on a micro compensator, which aligns radial and axial deviations. Thrust forces are reduced on the tap flanks, which results in better surface quality and longer tool life. Synchronized tapping chucks use ER-Collets with a square drive. It is not recommended to use a collet without the square due to the high torque that will make the tap rotate in the collet if not used.
For quick change tap adaptors, it is also important to use the right size tap adaptor, otherwise the risk of tap breakage is high as well as poor tolerance on the finished thread.
To get the best result from machines not equipped for synchronized tapping, the following recommendations should be observed:
- Program machine feed 10% lower than theoretical value (thread pitch rpm). This enables the tap to cut precisely on pitch
- Reduce tapping depth by 10% to avoid tap breakage
- When tapping deep holes in soft materials, e.g. aluminium, feed and depth should be reduced by 3–5%
Indexable insert drill||Drill adaptor|||
Exchangeable-tip drill||High-precision hydraulic chuck|
(use only with collet)
Solid carbide drill||High-precision hydraulic chuck|
|ER collet chuck|
Reamers||High-precision hydraulic chuck|
|ER collet chuck|
Taps||Synchronized tapping chuck||ER collet chuck|
Indexable insert end mill||High-precision hydraulic chuck||Weldon adaptor|
Exchangeable-head end mill||High-precision hydraulic chuck|
(large machine tools and long overhangs)
|Exchangeable head adaptor|
(small and medium machine tools and short overhangs)
|Solid carbide end mill||High-precision hydraulic chuck|
|ER collet chuck|