educa wrote:Does anyone know what benefit I would get by using a beam expander like tis one on ebay?
http://www.ebay.com/itm/CO2-10600nm-10-6um-2-5x-Fixed-Magnification-Beam-Expander-f-Laser-Marker-Marking-/120812240030?pt=LH_DefaultDomain_0&hash=item1c20f87c9e
educa wrote:...
If for example I use a cheap 8bits DAC (or even an R2R ladder) then I could setup the voltage to the laser PSU in 256 steps (0->5 V in +- 0.02V increments) and in case of a 40 Watt laset I would control the power from 0->40 in 0.15 Watt increments.
Is that how it works? Or does such a PSU not react to 0->5 but to a smaller range of voltages? Maybe there is a minimum voltage needed to shoot a laser at all ?
I would really appreciate if somebody could xplain this a little.
Bart
educa wrote:For example a few posts ago in this thread you see my dragon image. This dragon is made out of vector engraved lines + vector CUT lines. Or course in real life I would first engrave and then cut.
educa wrote:But.... cutting is preferably done at full power and engraving possibly not.
educa wrote:Does this mean that if I control with an arduino, it is best for me to connect 1 output pin of my arduino to the TTL Low (or is it high) and then connect the arduino through some DAC to that 5V analog input on the PSU to control laser power?
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