For High Speeds BIG Daishowa Mega Chuck Series

MEGA CHUCK Series – Wide variety of collets and chuck bodies to cover all high speed ultra precision machining applications.

Ultimate tool balance	Notch-free design MEGA NUT (PAT.) prevents vibration and reduces noise
Tool balance has been pursued throughout all stages from design to manufacturing processes. The max. spindle speed required by each series has been achieved. Highly balanced design Thoroughly polished periphery Balance inspection using a highprecision dynamic balancer	In 1996, as a pioneer of the high speed era, BIG announced a new type of clamping nut that does not require wrench application. These nutsoffer superior balance, and eliminate vibration during high speed rotation. This ideal nut design not only reduces whistling noise and splattering coolant, but also assures increased strength of the nut itself.
Strict quality control from manufacturing to shipping	Mega Wrench makes nut fastening work easier
Serial number is laser-marked on each Mega Chuck. Production history is stored for use under strict quality control.	The unique Mega Wrench has a one way clutch system which is capable of evenly applying force to the entire nut periphery for safe and secure tightening. Furthermore, the ratchet function offers outstanding workability and reduces the burden of nut tightening work.

For Micro Drills and Ultra-Fine Endmills – MEGA MICRO CHUCK PAT.

• Ultra-slim design of ø10mm nut diameter minimizes interference with the jig and workpiece.
• Clamping Range: ø0.45 – ø8.05
• Max. 60,000min^-1

Extremely slim design with ø10mm nut diameter (3S type)	Collet accuracy: Within 1μm at nose
Slim design avoids interference. Ideal for small mold making combining high speed and high precision.	Unique and compact design of taper and cylindrical guide achieves stable accuracy within 1μm at nose.
Slim design to reduce workpiece interference	2 way coolant supply
“Straight Type” for minimal interference and “Rigid Taper Type” for increased rigidity are available.	Select a coolant nut suitable for the lubrication method.

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For Carbide Drills, Reamers and Finishing Endmills – MEGA NEW BABY CHUCK PAT.

• Clamping Range: ø0.25 – ø25.4
• Max. 50,000min^-1
• Makes high speed machining possible in addition to its high accuracy and versatility.
• MEGA25N series added with maximum clamping diameter of ø25.4.

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For Roughing and Finishing Endmills – MEGA E CHUCK 

• A collet chuck holder for endmilling that makes both high speed and powerful endmilling possible.
• Clamping Range: ø3.0 – ø12
• Max. 45,000min^-1

Collet designed for heavy duty gripping force	2 way coolant supply
The shallower taper and long tool shank clamping length of the MEGA E Collet improve concentricity and gripping force in order to achieve better surface finishes and stable clamping performance.	A coolant nut with an oil sealing function. Removing the internal PS Ring allows jet-through coolant supply.
Substantial body eliminates chatter
The chuck body is designed to be thicker in order to prevent chatter and deflection of the work surface during endmilling. Tapered body enhances damping effect by varying vibration frequency.

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For Heavy Cutting and Endmills – MEGA DOUBLE POWER CHUCK

• The evolved Milling Chuck, equal to integration with machine spindle.
• Clamping Range: ø16 – ø50
• Max. 30,000min^-1

Complete fit of nut and body	Secure coolant supply
Tightening the nut achieves dual contact between the body and end surface of the nut. This superior rigidity assures heavier duty machining without chatter. Rigidity increased by 1.4 times combined with dual contact.	Two types are individually designed for the most effective coolant supply.High accuracy straight collet with runout suppressed to a minimum. Select in accordance with the coolant usage.

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