Just noticed we're talking about cutting a 20 minute job down to 3-4 minutes with a Trotec... in wood? Someone's gonna have to prove this one to me!
pure math says that at 30 ips, running a 10" x 10" x 400 line per inch area will take 22.22 minutes, and at 140 ips that cuts down to 4.7 minutes... but that's in a perfect world!
For one, a machine running 30 ips is probably much closer to an ACTUAL 30 ips rate than a 140 ips machine, regardless of how fast it can change direction.
For another, the only way you can ever achieve this is if the 140 ips machine can duplicate the results of the 30 ips machine at full speed. In many materials, this is do-able with 60 watt hi-speed machine. 80 is better, but I'm thinking you're going to need closer to 120 watts or more to duplicate a 35 watt/30ips engraving at 140 inches per second, particularly in wood.
Note!! >>this is purely conjecture, based on my experiences with 4 different lasers. I know this to be true: my 40 watt 72 ips machine running 100 power and speed will barely mark a piece of wood at all. Math says an 80 watt 140 ips machine would do exactly the same- however, I realize laser output isn't necessarily linear (Dave will explain!
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An 80w Trotec or similar may very well cut HALF the time or slightly more off a 20 minute wood job, but IMO you'll need a lot more than 80 watts to cut the time by 80%...