Featured Products
Niken Kousakusho Co., Ltd. / Major Dream Holder
➀Purpose
Chatter was occurring during end milling, which was compromising the quality of the finished surface.
As a result, we had no choice but to reduce the cutting parameters.
To resolve this issue, we were seeking ways to improve machining efficiency that met the following conditions.
- We want to maintain the conditions recommended by the cutting tool manufacturer
- We want to address this without modifying the program
- We want to continue using our existing cutting tools as is
②Key Points for Implementation
To address this issue, we adopted the “Major Dream Holder” manufactured by Nikken Kousakusho, which features a built-in damping mechanism.
- The damping mechanism absorbs vibrations during cutting, ensuring stable machining.
- Nikken's proprietary bearings suppress runout during high-speed rotation.
③Examples
We performed machining on aluminum and evaluated the results.
- Machine used: BT50 machining center
- Tool used: 20 mm carbide end mill
Conventional Holder vs. Major Dream Holder (NBT50-MDSK20-105)
- Conventional Holder: At a feed rate of F = 5,000, chattering occurred, resulting in a wavy pattern on the finished surface.
- Major Dream Holder: Under the same conditions, chattering was suppressed, and an improvement in surface finish was confirmed.
④Results
- Machining efficiency was improved simply by changing the holder, without altering the cutting tools, clamping method, or machine.
- Even under machining conditions where the feed rate was increased from F = 2,000 to F = 5,000—more than double the original rate—no chatter occurred, and high-quality surface finish was maintained.
- The vibration-damping effect and the chuck structure with minimal runout reduce initial micro-chipping at the cutting edge, thereby extending tool life.
