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Centroid does, but Acorn doesn't have an expansion board yet.
8 inputs, 8 outputs, 4 axis currently

PS, I love my Acorn board, and my other Centroid Mill

Things are limited and fixed because it was designed/copied from a commercial machine.
It's not customization friendly, because it isn't a computer for tinkering, it's a computer for working. It is...

Sure, but Acorn was designed, built, and supported by a CNC machine manufacturer with over 30years experience.
Use what you feel most comfortable with. ;)

I was only pointing out that there are...

Acorn can and does tandem. However only 4 axis total right now. (tandem Y, plus X and Z which is 4)
It is stable and reliable.

Clay

Take a serious look at Acorn by Centroid!

looking forward to the rest of the build!

Ray didn't get banned because he was pointing out problems, it was his attitude and accusatory manor.
I wish Ray the best in whatever CNC project he has next, but I assure you that the Centroid...

Working on it Milton! lol

Interesting, I was testing at 30ipm or there about. I'll have to recheck this.

Clay

Recently our eztrak series 2 SX had a motherboard and HD failure and we bought the upgrade kit from EMI. Installed and everything is back up and running with one issue.
I programmed a simple oval...

"If I don't have to replace ball screws, stuff would be significantly more simplified."

You most likely will not find a manual mill with ball screws. However they are easy to spot if you actually...