Axminster ZX25M User Manual page 11

Parts Identification and Description (Continued)...
Milling Head
This is the 'milling machine' and the descriptions of its various parts and components
are detailed as follows:-
Milling head The main casting to which all the components are attached. The head has a
casting sleeve housing machined at the rear, which allows the casting to be fitted to
(See Fig 1) the Main Tool Post. There are two M12 bolts, washers and nuts to the rear of
the sleeve housing which clamp the casting to the main tool post.
Motor Standard 240V 50Hz single phase motor rated at (750W 1 H.P . ZX25M)
(See Fig 3)
Pulley and drive A pressed sheet steel compartment consisting of a lower tray and an upper
belt cover cover, the cover is hinged on one side and secured by two toggle clips on the
(See Fig 3) other. It covers the drive belt train for safety during normal operation. There is
a microswitch fitted between the cover and the lower tray; which will prevent
the machine running if the cover is not lowered.
Pulleys and There are three pulley towers in the millhead, the drive pulleys fixed to the
drive belts motor shaft, the driven pulleys fitted to the quill, and the intermediate 'jockey'
(See Fig 3a) pulleys that connect the 'train' together with the two drive belts. A total of 12
speeds are available using the various belt positions on the pulleys. (See the
chart on the machine or later in this manual.
Head locking These are two M12 bolts, washers and nuts that clamp the sleeve housing at
bolts the rear of the head. They should be loosened to allow the head to raise
(See Fig 3b) and lower and pivot about the post. When the required position is achieved,
re-tighten them to lock the head in position. The machine should not be
operated with the head in the unlocked state.
Motor mounting The motor is mounted on a pivoted plate, which forms part of the tensioning
plate system for the drive belt train. The pivot plate is hinged on the left and the
(See Fig 3b) positioning bar (yoke) is in turn hinged off the right side of the plate and is
entered into a tunnel housing in the head casting. There is a small Bristol
handled bolt that screws into the side of the tunnel housing and will clamp
the yoke in position. It is good practise to release the tension in the drive belt
train if the machine is not going to be used for any lengthy period.
Tri-Lever feed Three levered handle that is used to drive the quill (and hence the chuck or
handle the tool) up and down. The boss of the handle is fitted to the end of a
'splined' gear shaft. This 'splined' gear is, in turn, engaged in the rack cut into
the quill body. The other end of the 'splined' shaft is engaged in a
contra-wound spring, this provides counter balance to the weight of the quill,
arbor, chuck and drill, giving a more controlled 'feel'during drilling operations.
It also retracts the quill when drilling is completed.
Draw bar nut A moulded plastic cover that clips into the top of the drive belt cover, to afford
cover protection from the rotating top of the draw bar, when the quill is at the top of
(See Fig 3) its travel.
Speed Select A small chart, which shows the pulley and belt configurations required to
Table attain the various speeds available on the machine.
(See Fig 11)
(1500W 2 H.P . ZX30M)
W
A X M I N S T E R
W H I T E
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