超硬座ぐり用エンドミルfx-zdsを使用する場合、先に下穴を開けておく必要があるか？ | オーエスジー

When using the FX-ZDS end mill for carbide counterboring , do I need to drill pilot holes first? 

When using FX-ZDS, an end mill for carbide counterboring , do you need to drill pilot holes first?

Not required for FX-ZDS. In the case of VP-ZDS with powder high-speed, it is recommended to set the pilot hole diameter (about 70% of the tool diameter).