Rumag Series 2
Types: Horizontal RE-2-G, , RE-20-G and RE-25-G; Universal Models RU-2-G, RU-20-G and RU-25-G; Vertical Models REV-2, REV-20 and REV-25 and the Vertical-Combination "Rumaversal" RE-2-VS, RU-2-VS, RE-20-VS, RU-20-VS, RE-25-VS and RU-25-VS
Using the same base, column, knee, table, cross support, overarm and other larger components, the Series 2 miller was built in a wider variety of styles and with a greater choice of specification than the others in the maker's range. The main version offered were plain horizontal, universal with swing table, vertical and as a horizontal fitted with an internal gearbox ram-type vertical head with a double-swivel end that had 100 mm of fine-feed quill travel.
Driven by a motor contained within the main column, the horizontal models (Types RU and RE) had a stiffly supported main spindle, made from hardened and ground steel, running in selected, high-precision double-row bearings and driven by multiple V-belts on the higher speeds and through gears on the lower. The pure vertical models (REV) used the same spindle drive but with the motion turned through 90° by fine-lapped, spiral-toothed Klingeinberg-Palloid bevel gears. Clamped to the column face by four bolts, the head could be rotated through 360° and had a quill with 100 mm of travel operated by a full-circle handwheel that gave a fine feed. Motor power varied according to machine type with the smallest models, the RE-2-G and RU-2-G and Rumavertical RE-2-VS and RU-2-VS, having as standard 4 or 5.5 kW; all other types were also offered with a choice - 5.5 or 7.5 kW - although the vertical machines, the REV-2, REV-20 and REV-25, were usually supplied with the more powerful option. Motors were available as single or 2-speed types of which two of the former and one of the latter were listed: for all the ordinary horizontal and vertical types with a 1400 r.p.m. 1-speed unit the twelve spindle speeds ranged from 25 to 1050 r.p.m.; the 2800 r.p.m. version gave 100 to 2100 r.p.m. and with the 2-speed 1400/2800 r.p.m. type a very useful twenty-four speeds from 25 to 2100 r.p.m. The geared ram head on the Rumavertical was offered with various motors: a 1400 r.p.m. of 4 or 5.5 kW on the RE-2-VS gave ten speeds from 56 to 2800 r.pm. and a 2-speed 1400/2800 version twenty speeds from 28 to 2800 r.p.m. The two larger versions could be fitted with either a 5.5 or 7.5 kW single-speed 1400 r.p.m. type or a 2-speed 1400/2800 r.p.m. version - the resulting spindle speeds being identical to the smaller model. All splines, gears and shafts (the latter supported in either ball roller bearings) were made from hardened and ground steel of the highest quality with lubrication by oil bath.
Each size of miller was offered with a choice of tables: the RE-2 in horizontal, universal and Rumaversal forms could be had with either a 1000 x 330 mm and all other versions with a choice of 1250 x 330 mm, 1450 x 330 mm, 1300 x 400 mm and 1500 x 400 mm.
Travels varied from 700 mm longitudinally on the 1000 mm table to 900 mm on the 1250 mm version and 1100 mm on the 1450 and 1500 mm lengths. While the RE-2-G and RE-2-VS were limited to 280 mm of cross movement the RE-20-G, RE-20-VS and RE-25-VS had 350 mm. Vertical movements were 480 mm on all the vertical REV types, 500 mm on the RE-2-G and RU-2-G and 530 mm on the larger RE-20-VS and RU-20-VS models.
While the smaller types had conventional speed-change table-feed gearboxes (that gave a range of twelve rates from 15 to 750 mm/min. horizontally and across directions and from 7.5 to 375 mm/min. vertically) feeds on all the Type 25 versions were driven by a variable-speed, externally mounted DC motor that gave longitudinal and cross rates from 20 to 2000 mm/min and vertical set more sensibly at 10 to 1000 mm/min. Rapids on all types were at 2000 mm/min laterally and 1000 mm vertically. Control of feed rate was by a dial, with selection of direction by push-buttons and disengagement by either hand or adjustable trip dogs. As a safety measure the table and knee handwheels were arranged to disengage automatically when power feeds were running.
By the early 1970s Rumag were offering the Series 2, in all its forms, with NC control, their preference being for installations by Heidenhain.
Rumag Milling Machine Designations for the Series 2:
R = Rumag milling machine
2 = Series 2 machines
20 = Series 2 Heavy model
25 = Series 2 Heavy model with stepless table feeds
E = Plain horizontal miller without swivel table
U = Universal miller with a table able to be swung 45° in each direction from central
EV = vertical miller without swing table
G = Horizontal miller with standard overarm
VS-1 = Horizontal miller with ram-type overarm incorporating a motorised vertical head swivelling 365° in two planes
VS-2 = Horizontal milling machine (as VS-1) with vertical head having 100 mm of quill stroke
VS-3 = Horizontal miller similar to the VS-2 with a head swivelling 360° in one plane only
A = Power in-and-out feed of the ram head by a separate motor
For example the RU-20-VS- 2-A would have been a Series 2 horizontal "Heavy" model fitted with a ram-type vertical milling attachment able to swivelled in two directions from central and with power in-and-out feed..