Axis AXIS USB Manual de Instruções Página 43

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HyTechWorks©2013 – V3.1 39
Auto Tool Setting
Two commonly used auto tool setting processes are implemented. One for
professional tool setter (one with retreatable spring loading surface) and one for
low cost tool setter (one with hard non-retreatable surface).
A professional tool setter normally has 2 wires, working like a precision micro
switch. It uses magnets to stick on the bench top stably. When the tool presses
the surface down to a fix point, the switch changes its status. The switch is
usually isolated from the mechanical parts electrically. It can connected to the
tool setter input pin without using an optical coupler.
Low cost tool setter can simply be constructed by a piece of PCB board or a block
of metal with isolation layer on one of its surface. This kind of tool setter requires
conductive tool bits, forming a close circuit when tool bits touch the tool setter
surface. An optical coupler is required to interface with tool setter input safely, as
shown in the following figure. GND2 is the ground of +24V. It is connected to the
machine and tool using the black crocodile clip. 1800 ohm resistor limit the
current through the LED to 10-20mA when the tool touches the PCB surface. The
closing circuit status optically coupled to the transistor side, grounding the tool
setter input.
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