Poor roughness of deep hole drilling

Poor roughness of deep hole drilling

The cutting speed is slow, support frames are in one place, which cause the scratch on the workpiece surface.

Improve the rotary speed.

Improper use of cutting oil, oil temperature is too high,which is bigger than 45 degree.

GSM recommend Derunbao or Basso cutting oil.

Poor filer result, small chips are in the oil when processing, so the parts inside hole is not so good.

Improve the filter precision, at least to 40um(for GSM, our filter precision is 20um.)

Support frame is broken.

Replace the drill bit and check the cutting speed.

Machine or parts is shaking, the clamping is not so stable.

Check the surface of drill bit , oil supply head and workpiece.

There is circle in the surface of drilling hole.

Axis feed, which cause the drill bit moving in the axis direction. Improve the feed volume to get a higher cutting force.