A little background :

About six years ago, as I was just starting to design my shop-built 
gantry machine, I came across a SUPER deal on Ebay for six sets of drive 
components. Each set included a line filter, Parker OEM300 75V, 7.5A 
power supply, Parker OEM750 stepper driver and a stepper motor. I didn't 
know a whole lot about this stuff a the time, but I knew it was a deal I 
couldn't pass up. So, they became the drive system for my CNC build. As 
it turned out, only five of the six drivers worked. Thas wasn't a 
problem (especially for what I'd paid for them) because my gantry is 
only (at least for now) a 3-axis machine. But, six years later I've lost 
two additional OEM750's and I'm now running on my last three. Another 
failure and I'm down and its decision time.

Here's my question for the worldly experience of the group. I'm retired 
and this is a serious hobby machine and I don't have a great deal of 
money that I can throw that this. So when the inevitable failure of the 
next stepper driver occurs, what would you do? Repair the OEM750 
(~$280)? Or would you look at replacing the Parker hardware with 
something else like Gecko or maybe go the Mesa route? I've really been 
pleased with the stepper performance I get from the Parkers and the 
software stepper generation that Linuxcnc gives me is more than fast 
enough for the work I do. The repair is expensive and the drives were 
released in 1997. So they're 18 years old. I just don't have enough real 
world experience with this stuff to feel like I can make a good decision.

If it was your problem, what direction would you go?

Thanks in advance for your thoughts.

Dean

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