How to get a signal to controll spindle speed?

[Jacob Kranendonk <j_kranendonk-at-yahoo.com>]

Hi list,
Can anyone tell me how typically a mill with
controllable spindle speed out the emc is being set
up? I want somehow a possibility to controll
laserpower by the emc software. I think I could use
the "spindle speed" command for this purpose. But how
do I get a signal for this, out of the emc? Does this
take extra hardware (like a digital/analog converter
or something), or is there a way to get a digital
signal to. All I need as a final signal to the laser
is a PWM (Puls With Modulated) TTL signal at 5KHZ.
Does anyone have a sugestion how I can achieve this,
perhaps with the help of some simple IC? Many thanks
in advance, Jacob


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