Seriously go fuck yourself . If you have nothing to countribute , don ' t post anything . <| sep |> Nah , those are actually really messy . A countersunk screw or bolt won ' t install well in that hole . In addition , starter holes which are only required in thick material are rarely used in the part . There ' s usually a larger HAZ around them . The only thing I ' m not sure about is the motion at the end of each hole where they appear to be widening the hole , but that may just be to get rid of the draft angle inside the hole to make sure that cuts starting at the hole actually meet up . I make the fiber laser parts that go into these IPG is the biggest company in this space but there are lots of smaller ones , but I don ' t see much of the controls and system work that the machine builders do .