email: tony@lathes.co.uk
Home   Machine Tool Archive   Machine-tools Sale & Wanted
Machine Tool Manuals   Catalogues   Belts   Books  Accessories

Rambaudi Milling Machines
UR60 & UR60F

Operation and Parts Manuals are available
for a number of Rambaudi milling machines

Rambaudi Home Page   Rambaudi V2 and V3   Rambaudi Series M

Rambaudi UR60 and URF60 (fixed spindle)
Similar in layout to the better-known Swedish Abene, the Rambaudi UR60 and URF60 (a sub species without a quill-feed head) were one of a family of machines including the FVR Vertical, FUR-2 Horizontal and FCR-3 Ram-head Horizontal and Vertical that shared the same knee, saddle and table assembly. Especially heavy (5700 lb) and well-built millers, the main castings were in a Meehanite iron to Brinell 200 hardness with all shafts and gears in hardened and ground high-quality steel and the slideways hand scraped. Designed to be equally effective as both a horizontal and vertical type, the arrangement of the UR was unusual with the main column split into two parts along a diagonal line machined with prismatic ways. Able to be driven up and down the lower section by a push-button controlled 0.5 h.p. motor - the effect was to permit the upper head-carrying assembly to be raised and lowered through a range of 22" - while also being moved in and out through a small range. Although the extra sliding surface on the back added to the flexibility between cutter and machine body, the available movement was not meant to be used for a cutting traverse, instead it was intended just for repositioning the head and, once this had been done, was locked down by four substantial bolts.
Continued below:

Continued:
Fixed to the front right-hand face of the sliding element, the head could be swivelled through 150 and had, in addition to six rates of power feed from 0.002" to 0.012" per minute, both a lever-operated quick-action drilling quill and a handwheel giving a fine feed through worm and wheel gearing to a precision-ground helical rack on the hardened and ground quill assembly. A typical micrometer-dial/ruler depth-control stop was provided on the front of the housing, this being arranged to automatically release the power feed when working (either up or down) to an accuracy of within 0.001".
Quill travel was 6 inches and the spindle nose a massive 50 INT (or, as an option an ASME 2, allowing heavy cuts to be taken with impunity. However, for even heavier work and faster rates of metal removal, the head could be supplied without the quill feed, the miller then being called the type URF60 ("F" for fixed). Running in high-precision bearings and incorporating a flywheel assembly, the spindle was driven by gearing from 5 h.p. motor built into the sliding section of the column and had 18 speeds from 25 to 1500 r.p.m. Fitted as part of the standard equipment were both an overload safety clutch and a push-button operated electromagnetic brake that brought the spindle to a rapid halt - and kept it locked until released by the operator.
Sharing the same knee, saddle and table assembly as fitted to the FVR Vertical, FUR-2 Horizontal and FCR-3 Ram-head Horizontal and Vertical models, all table controls were front facing, the longitudinal feed being by a handwheel connected to the longitudinal feed-screw by bevel gears. Just one size of table was offered, a huge 59" x 13" with 47" of longitudinal travel, 12" across and 18" vertically; as an option a universal table could be provided able to be swung 45 each side of central. Feeds were driven by a separate 2 h.p. motor through a multi-disc clutch housed in a pressure lubricated gearbox held within the knee - the result being a useful 24 rates (split into high and low ranges marked in black and red respectively) from " to 40" per minute along and across and the same number vertically from " to 20" per minute. Rapids were fitted to all three axes with horizontal and cross feed at the rate of 120" per minute and vertically at 60". Selection of feed rates was by a combination of a dial and small lever on the front face of the knee with engagement by a second, longer lever - pressing it down from its central (neutral) position engaged the feed (and started the spindle) while lifting it up (against spring pressure) caused the rapid feed to engage.
Table feed screws were hardened and ground with that for the longitudinal drive running in an oil bath and made in two short sections, left and right and spring loaded against each other. The screws, around 3" in diameter, engaged against a long, semi-circular nut (a helicoidal rack) fastened to the underside of the table - this ingenious and beautifully constructed arrangement (adjustable to eliminate backlash) giving a huge surface area to slow down the rate of wear. Of conventional design, the cross-feed screw ran through two opposed bronze nuts, this arrangement also being adjustable to eliminate play..

Rambaudi RU60 arranged for horizontal milling

Rambaudi RU60 arranged for vertical milling

Feeds were driven by a separate 2 h.p. motor through a multi-disc clutch housed in a pressure lubricated gearbox held within the knee - the result being a useful 24 rates (split into high and low ranges marked in black and red respectively) from " to 40" per minute along and across and the same number vertically from " to 20" per minute.

The hardened and ground quill housing was machined with a precision-ground helical rack

Table feed screws were hardened and ground with that for the longitudinal drive running in an oil bath and made in two short sections, left and right and spring loaded against each other. The screws, around 3" in diameter, engaged against a long, semi-circular nut (a helicoidal rack) fastened to the underside of the table - this ingenious and beautifully constructed arrangement (adjustable to eliminate backlash) giving a huge surface area to slow down the rate of wear.

Rambaudi Home Page   Rambaudi V2 and V3   Rambaudi Series M


Operation and Parts Manuals are available
for a number of Rambaudi milling machines


Rambaudi Milling Machines
UR60 & UR60F
email: tony@lathes.co.uk
Home   Machine Tool Archive   Machine-tools Sale & Wanted
Machine Tool Manuals   Catalogues   Belts   Books  Accessories