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Arboga/AB Skania/Eskilstuna Tools
UM400 Miniature Combination Machine

UM400 Page 2

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UM400 Miniature Combination Machine

Sometimes badged as the AB Skania  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 to which was fitted a single T-slot 14" x 57/8" (360 mm x 150 mm) 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). Micrometer-graduated collars were fitted to the feed screws calibrated in 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. 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).
Should any reader be willing to contribute a set of high-resolution photographs of a UM400, the writer would be delighted to hear from you..


Base unit and table: Part 4001

Horizontal Clamp Column Part 4003

Motor and Spindle Part 4004

The vertical miller consisted of the base unit and table (4001) together with a vertical column (4002) a right-angle clamp (4003) and the spindle and motor unit (4004)

Tool Holder with Return Stroke Relief Part (40014) - a standard shaper-type clapper-box hinge mechanism was used but is not illustrated.

Shaper with Base (4001), Motor and Spindle (4004), complete (side-mounted) Slotting Attachment (40011) and Tool Holder with Return Stroke Relief (40014)

Vertical Column Part 4002

File Holder Part 40012 for Slotting Attachment

Slotter with Base 4001, Column 4002, Motor and Spindle (4004) and the complete Slotting Attachment Head 40011

Complete Slotting and Shaping Attachment Part 40011

Drilling Attachment Part 4005

UM-400 as a drilling machine with quick-feed rack-and-pinion drive to the head.


Turning Tool Holder Part 40017

Tool Rest Part 40013

The Arboga UM400 adapted as a lathe. Centre height 13/8" (35 mm) and 57/8"  (150 mm) between centres.

Catchplate for between-centres turning Part 40016

Turning Attachment Column with Tailstock Part 40015

Grinding Wheel Shatter Guard part 40010

Grinding Wheel Holder Part 4009

Motor and Spindle Part 4004

As a grinder the UM-400 required the Base (4001), Motor and Spindle (4004), Clamp (4003), Grinding Wheel Holder (4009) and a Shatter Guard (40010)

Cutter Arbor Part 4008

Overarm Part 4007 (the design differed)

Horizontal Milling machine with Base (4001), Motor and Spindle 4004, Milling Column (4006), Overarm with bearing (4007), and Cutter Arbor (4008).

Motor and Spindle Part 4004

Arboga  UM400 badged as an AB Skania 

UM400 Page 2

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UM400 Miniature Combination Machine


Arboga/AB Skania/Eskilstuna Tools
UM400 Miniature Combination Machine
email: tony@lathes.co.uk
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