Hello all,

we have a problem with the gun drilling process at the Swiss turn

The Part is about 150mm long & ø 3.5mm which we are processing in swiss turn, & it has a thro' hole of ø1.8mm.
Due to the smaller diameter, we planned to drill from both sides for about 80mm deep.
And we are using a Single flute Carbide Gun drill.
The material of the part is SS455
But unfortunately, the drill is not matching at the center of the part always it has offset.
Below are the Parameters.