ロングドリルをガイド穴に入れる際の回転数は？ | オーエスジー

As a guideline, reduce the rotation speed to 500 rpm or less when inserting a long drill (regardless of whether it is carbide or high-speed) into the guide hole. If the drill itself is very long, such as the ADO-40D/50D series, it will swing even more, so in order to prevent the cutting edge from hitting the guide hole, move it to the front of the machining point at a reverse rotation of 500 revolutions per minute or less, and process it under the prescribed conditions.

 

References: Tips for deep hole drilling of carbide long drill "ADO-15D~30D"

Reference: Deep Hole Drilling of TDXL High Length Drill