Vhu – as a boring device – considerably increases possibilities of boring, drilling and milling machines. These heads are suitable for precision boring of cylindrical holes and for machining of external cylindrical surfaces. The boring head Vhu by means of an automatic slide feed makes possible facing, backfacing and taper machining. The slide feed is adjustable in three or four grades and is stopped on adjustable dog by the pin clutch. The feed is derived from the rotary motion of the head, if one of the feed is derived from the rotary motion of the head, if one of the feed is adjusted, the pin of the clutch is put in and the brake ring is held by means of the stop bar.