What is the best way to position holes on a tube.
I am building enclosures for optical equipment that are based on 7 inch and 12 inch diameter alluminum irrigation pipe. The biggest challenge that I am encountering is how to accurately position and drill various holes on the surface of the pipe.
What techniques do you use to layout the holes radially around the tube? I know the angles of the holes around the surface but I'm finding it difficult to map the positions of the holes on the curved surface of the tube.
The holes are of two general types. Holes that are aligned radially with the center of the pipe and those that are not. The radial holes are easier to drill because the drill enters the material perpendicularly. Holes that encounter the surface away from the perpendicular tend to wander. What techniques do you use to control this problem?
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