The toolmaking company where I served my apprenticeship used to machine the fork legs for Triumph motorcycles in the 1970s. We had Mollart gundrilling machines which were used predominantly for drilling the water circuits in injection mould tools. The drill itself is a hollow "V" crimped tube with a carbide tip brazed on the end with a hole through it. Oil is forced under high pressure down the tube, keeping the drill perfectly straight, through the tip lubricating/cooling the cutting area and forcing the swarf up the crimped "V" on the O/D of the drill. The fork legs were set in handed jigs with pneumatic toggle clamping and drilled with one continuous cut taking from memory about 60 secs. No reaming or honing required, just one straight cut leaving a beautiful polished finish and accurate bore.
I used to re sharpen gun drills, Think they were made by Gunson. (not who made colour tune). These were used on Concorde.
