Same motors and motor drivers that came with it from the factory.
I did turn down the available current for the motors at the motor driver and have not seen a change in performance. Mine has a 1/2 current option on switch 4, enabled that also.
The are no longer ‘hot’ to the touch when I run all day.
Thanks, Jack - what I meant was would you mind telling me the model numbers of them, please?
I originally ordered our biggest laser with servos, because I wanted to try & get faster engraving turnaround times, (at the time I had several jobs that were 8-16 hour runs non-stop)
and the makers in China put Leadshine easyservos in (which are closed loop steppers actually) and did a test run and despite poor english translations, said it will not work on our unit (a 2-tube 2500 x 1300 custom made unit)
I asked why, and got no answer that made any sense.
So they put it back to steppers, and ran a squiggly test path that took 48 hours to do - turning the beam off after a minute in, then reran it and after tracking the original path , decided that was ok.
The X stepper is smaller than Y, as it only has to move the chain and double heads, whereas Y has the whole gantry, 2 tubes, water and all, to shift - much more interia.
I did pay for them to send the sesy servos and drives out with it, so I could experiment in an old ULS box I have - but I’ve been too busy to try!
I see now some Chinese mobs are offering machines with Leadshine BLM57130 servos, (genuine servos-with 1000 line encoders), and the AC 606 (?) drives, and the notion intrigues me, although I don’t really want to upset a machine that works fine now I have tuned all the wobbles out.
Apparently the RD 6445 controller can handle the servo drives perfectly as they’re a PWM kind, like the steppers.
(For some reason I thought the 6442c I have could not handle them.)
I’d appreciate any thoughts, thanks!
P.S. I know if I try & make ours currently accelerate too quickly, it vibrates, groans and refuses. Slower accelerations produce much more accurate paths though.
They are probably the cheapest NEMA23 you can find. It’s Chinese.
Data-Sheet-Stepper-Motor-Support.pdf.txt (839.0 KB) – remove the .txt extension it’s a pdf.
That’s a big machine you have… photos for us are always nice and welcome… 
How fast are you trying to run? Speed isn’t everything. Most of my engraving is done in the low 100 - 300mm/s range. I explained the relationship about the lps response and speed. If you want much control, it’s not running faster if you can help it.
If you want to severely cut the engraving time, reduce the mass on the carriage, servos or not. As your speed increases the overscan required for a scanning type of operation is reduced allowing higher acceleration speeds. The less mass the quicker it can slow down, turn around and go the other way.
Skip to 20:08 into this Russ Sadler video, it shows the value of reducing overscan and job time. It’s about 4 minutes worth of video…
Here you are, Jack - photos as requested!
(It normally gets covered up with fitted sheets for dust purposes.)
That’s an old but mighty useful router to the right- it’s 33 years of age!
Thanks… What a monster…
Loved the pictures, thanks again…
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