i've not done it with linuxcnc
we did it a lot in heidenhain tnc controls for sink edm

google thread milling

you need a tool with the correct pitch on smaller shank than the drilled 
hole

how the metal is attacked can be:
  goto to the bottom before interpolating an expanding circle
or
  helix down at the desired radius

multiple passes can do roughing and finishing

Linuxcnc has the primitives to do this
this is an application not a special motion ( afaict )

the problem in sink edm was that the leading edge of the tool wore out 
quickly if the tapping was plunged
versus
if the path was interpolated (expanded laterally from center),
  then the tool wear was evenly distributed over the tool face

i'd think the same advantages occur in chip machining

also a larger cutting interface occurs ( not a single leading point )

it was a real advantage when making large diameter threaded plugs ( > 
100mm dia )
and its really simple program

tomp tjtr33



On 02/03/17 14:59, Valerio Bellizzomi wrote:
> http://www.infodelta.it/foto/film/filettatura%20interpolata.mp4
>
>
>
>
>
>
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