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In the deep hole drilling industry, skewness is an very important standard.
1. We have to consider about the processing method. During the deep hole drilling, for the drill stem and workpiece counter rotary,it’s the best way to get a good skewness. Then only the workpiece rotate. And compared with the workpiece fixed, drill stem rotary and feed is better than that(cause when the workpiece is very big, it’s difficult to rotate the workpiece).
2. Installation precision of guide bush has an very important effect towards the skewness. When assembling the machine, make sure that guide bush, workpiece spindle and drill stem spindle box are in the same axis. And also skewness has a relationship with processing depth. 
3. The grinding angle of the drill bit also has an effect towards the deep hole rpocessing. And for more information, you can refer to our website:http://www.gsmdrilling.com/gun-drills-1. Aiming at different processing material and drilling hole diameter, a good grinding angle will get a better skewness.
4. Also the processed material condition has a great influence towards the processing. During the processing, the drill bit will shift to the soft part of the material. So the heat treatment of the material is an crucial part of processing, and uniform material microstructure .
5. The proper cutting parameter also has a certain influence towards the skewness. When not effect the processing efficiency, apply for small feed volume,and a large volume will take a bad influence towards the skewness. 
If any more question, please feel free to contact us.
Email:gsmsxoffice@gmail.com
Whatsapp:+8618740435523
