F/26 allows executing grooves in tube-sheets' holes as shown,
where reach "B" can be adjusted from 1 to 12 mm.

In case reach "B" must be superior to 12 mm, we supply mandrels,
cutter sprigs and thrust bearings for reach up to 300 mm.

It's used on radial or programmed drilling machines, multi-spindle
too.

It can be succesfully used for reviving tube-sheets' grooves
of heat exchangers to be made again by using a traditional
portable rolling motor, being the tube-sheet horizontal or vertical.