Headstock
The Headstock is of a massive iron casting and is aligned, fixed and dowelled
in accurate alignment with the V. Mill table. 0.012mm (0.0005") over
a table length of 180mm (7.0"). The headstock incorporates two 48mm
diameter, precision, angular contact bearings. The headstock spindle is
hardened and ground and carries a fine threaded adjuster nut for bearing
pre-load and the elimination of spindle end-float. High tolerance bearing
caps are fitted for the protection of the bearings. The headstock spindle
has been designed to accept Cowells tooling (collets, flycutters, drill
chucks and arbors. See the Vertical Mill accessory page). The headstock
spindle has an internal engagement pin and tooling is secured in the precision
ground mouth and bore of the spindle via a draw in bar supplied with the
machine.
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Slides
All slide ways are dovetail in form and fitted with gib strips for the elimination
of play and eventual wear. Clamping locks are also fitted so that each slide
may be locked during the machining process thereby ensuring rigidity.
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Column, Knee, Saddle and Table
All machined from solid cast iron bar providing the mass, stability and
rigidity so essential in any quality machine tool and of particular emphasis
in milling work where interference cuts are common. The table has two Tee
slots for the mounting of accessories (see the Vertical Milling Machine
Accessory page) such as Dividing Head (RGB61) and Machine Vice (RGB57)
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Handwheels
The handwheels fitted to the table and cross slide are stainless steel.
The large diameter handwheel fitted to the Vertical feedscrew is of a durable
nylon with steel insert. All handwheels are fitted with very accurate computer
laser etched, re-set to zero, calibration dials. The clearly marked dials
are graduated in 50 increments of 0.02mm.
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Drive System
The British manufactured Parvalux electric motor has a 4000 rpm. capability
and a continuously rated output. Variable speed drive is provided through
an electronic speed control board. Toothed pulleys are fitted to both motor
and headstock and the toothed drive belt ensures positive non-slip drive.
A quick release fibreglass guard shrouds pulleys and belt.
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Base Unit
The cast aluminium base unit houses the electronic speed control board and
switchgear. The base is provided with four pre-drilled fixing lugs. The
Vertical Mill can however be used as a free-standing unit should constant
portability be required.
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