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A building set is provided including at least a drive motor, a
spindle stock and a support element for holding these elements.
These elements can be assembled to form a variety of small machine
tools. The elements are formed as independent parts with under cut
clamping grooves. The elements are joined together at their clamping
grooves by a connecting element.
For the accurate setting of machine tools, mechanically and electromechanically
operating feeler devices are used, for example optical display means,
which light up at the moment of touch contact with a surface to
be machined. The accuracy of setting using these devices does not,
however, satisfy the required setting accuracy in many cases. A
method is provided, by means of the invention, in which a feeler
head is slowly approached towards the surface or edge to be touched
until the contact of the rotating feeler head with the surface or
edge corresponds to a feeler head rotational angle (.alpha.) which
is greater by a predetermined safety value than 180.degree. but
is smaller than 300.degree.. The device for this purpose consists
of a housing with an electrical voltage source and circuitry equipment
for optical display elements, the housing being penetrated by a
hollow shaft connected with one pole of the voltage source. The
hollow shaft is provided at its machine side end with an accurately
ground receiving region and carries, at its free end, an electrically
insulated feeler head which is connected to the input of an amplifier.
A tool holder for boring, milling and the like machine tools has
a conical shaft with a support member arranged coaxially on said
conical shaft. The conical shaft fits into a conical first receiving
bore of the machine tool spindle. The support member has a second
conical receiving bore for the conical shaft of a tool. The second
conical receiving bore is coaxial with the tool holder conical shaft
and is smaller than the first receiving bore of the spindle. The
tool holder conical shaft has a coaxial bore, in which is axially
movable a collet carrier with a collet. The ends of the collet are
constructed as claws and engage an annular groove at the free end
of the tool conical shaft. Several axially acting cup-spring packages
are arranged in the support member concentrically with respect to
the second conical receiving bore. The cup-spring packages act onto
the collet carrier through several radially extending support arms
for clamping the tool conical shaft in the tool holder. To release
the collet and to eject the tool conical shaft, at least one hydraulically
loadable piston, which acts onto the collet carrier opposite to
the spring pressure, is provided in the bore of the tool holder
conical shaft.
Machine tools description
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