Sometimes badged as the AB Skania Verktyg  and also Eskilstuna Tools (and with  examples of the latter often lacking a serial number) the superbly made and highly versatile Arboga UM400 was designed as a miniature, multi-purpose machine tool able to perform vertical and horizontal milling, drilling, slotting, shaping, filing, grinding and simple lathe work. It achieved these objectives not by repositioning or adapting its major components, but rather by the addition of specific modules, each adapted to a single task. The machine's base unit was a bench-mounting 12" x 57/8" (280 mm x 150 mm) cast-iron foot together with a column, the front face of which was machined with ways to take a conventional type of milling machine "knee" - this having a simple flat surface to which was fitted a single T-slot, 14" x 57/8" (360 mm x 150 mm) compound table that had a longitudinal travel of 7 1/2" (190 mm), a cross feed of 23/4" (70 mm) and a vertical movement of 31/8" (80 mm). While most examples appear to have been fitted with knee lift by a nut fitted with a 3-spoke capstan handwheel, the AB Skania Vertyg version has been found with an alternative system, a full-circle handwheel working through worm-and-wheel gearing that gave, presumably, a finer rate of feed of 1mm rise per revolution of the handle. Micrometer-graduated collars were fitted to the feed screws and could be engraved with either inch or metric graduations.
Driven by a 50 Hz 2-speed 3-phase 0.25/0.15 h.p. 2770/1410 rpm motor, spindle speeds were: 365, 730, 1410 and 2770 r.p.m. while for the American market a 60 Hz motor gave speeds of 440, 885, 1700 and 3400 r.p.m.
In order to create the main vertical miller, a simple column (Part No. 4002) was dropped into a socket on the base (4001) and a right-angle column clamp (4003) fitted on top to hold the combined motor and spindle unit (4004). In addition to the main machine components, a range of accessories was offered that included a tilr-base rotary table, metric and Inperial Collets, a slitting saw holder, lathe toolpost, 3-jaw chuck, catchplate for between-centres work and a machine vice All the parts, accessories and their various combinations are shown below and on this page. The maker's detailed and well-illustrated catalogue (in German) cab be found here and continued here..