This automatic machine is designed for simultaneously milling of the 2 extremities: chain stays/seatstays (milling to the B/B and to the seat-tube). It features an hydraulic clamping and an hydraulic advancement. Manual loading of the complete rear triangle (it can be loaded already complete in one welded piece or in two separate right left dropouts). Locking of the tubes and automatic and simultaneously milling by two hydraulic units. Adjustable advancement. This machine has an output capacity of one rear part per 20 seconds.