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The pallet includes one or more supporting faces, each of which
is provided with an anchorage system for equipping the clamping
fixture of a rough piece to be machined with machine tools. Each
supporting face has one or more anchorage members for components
of said clamping fixture. Each anchorage members may be adjusted
as to height and as to angular orientation and is connected with
a supply of fluid. Said adjustment is carried out by screwing and
unscrewing said anchorage members in corresponding appropriately
threaded holes in the supporting faces of the pallet.
Method of reducing the wear of the electrode in machine tools using
electro-erosion. There is provided a circuit with different stages
of power; the tension of the first can be superior, facilitating
the ionization of the channel and reducing the delay of ionization.
A circuit detects the ionization and sets going some programmable
counters which count impulses proceeding from the time base, the
frequency of which is superior to that of the work impulses; when
the preselected count has been reached, the circuit emits a signal
of conduction to the following power stage, which supplies an impulse
of stronger current, with a certain delay with respect to the first,
and so on. By succeeding in establishing the working current in
a spaced-out form, it can materialize in one or more jumps so that
the currents selected continue to increase progressively, varying
at will the shape of the rising side of the current impulse. This
method reduces the wear of the electrode by at least about 50%.
A tool exchanger for programmed machine tools includes a device
for the conveyance of selected tools between a tool room and a main
spindle of the machine tool and with two grip devices moving along
a prescribed rotation angle and arranged in a carrier support mounted
to the conveyance device and able to rotate between an alternate
position and at least one standby position. In order to achieve
faster exchange operations of the tools in a horizontal and vertical
machining spindle, the drives to open and close both tool grips
are activated at the same time. The support mounted includes a locking
device which blocks the tool grip to standby position in its closed
condition.
The bar-pusher actuation device for bar feeders applied to machine
tools includes a linear actuator composed of a chain with which
the bar-pusher is associated and which is closed around a pair of
fixed pinions and a pair of gearwheels which are movable with respect
to the pinions. The pair of gearwheels is mounted on a slider which
is slidable parallel to the direction of advancement of the bar.
The slider is actuated by a jack adapted to perform a reciprocating
stroke which substantially corresponds to the length of the portion
of bar to be machined.
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