Johnford SV and VMC (50 Taper) Machining Center Series
Johnford 50 taper SV and VMC super vertical machining centers are box-way, geared-head, C-frame machines that feature solid heavily-ribbed Meehanite cast iron construction to eliminate vibration and ensure excellent surface finishes and long cutting tool life. X-Y-Z travels for the 12-machine series range from 33″ x 20″ x 24″ (838 mm x 508 mm x 600 mm) to 120″ x 43″ x 32″ (3000mm x 1075 mm x 800 mm).
Four oversized box ways (two on the SV-40H) support the saddle and work table, maximizing X-axis accuracy over the full travel range of the machine, a key factor in maintaining part accuracy and precision. All sliding surface areas and gibs are coated with Turcite-B and hand scraped for precise fit.
Large diameter pre-tensioned ballscrews have a double-nut preloaded design to minimize the potential of thermal growth and promote high accuracy and high speed positioning.
Available horsepower for the 50-taper spindle ranges from 20 to 35 hp, depending on the machine, with maximum spindle speeds of 6,000 – 15,000 rpm. A two-speed gearbox is standard, with direct/integral drive optional. The motor and gearbox are aligned to ensure no offset and guarantee steady movement of the headstock along the Z axis. The design reduces torsion on the headstock and ensures optimum rigidity, long term accuracy and repeatability.
A 24-tool capacity arm-type automatic tool changer is standard, with 30-, 40- and 60-tool versions optional. A comprehensive list of options includes an automatic pallet changer, through-spindle coolant, 4th– and 5th-axis rotary tables, and other equipment packages that enable a user to tailor machine productivity to a specific manufacturing environment.
