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Very nice, looks a sturdy little machine there.

Lovely looking machine Dave well done mate.

One question why is the spindle so high up the front plate.?

One suggestion.!! . . .Cut deeper.
That cut could have been done in one pass and much...

Its always nice to see a new machine doing its first cuts. Sounds nice as well.

If the ballscrews are bent then you will get a periodic tightening as you rotate it, especially at either end of travel.

If the ballscrews / mounts / nuts are all mis-aligned then it will have a...

If using typical router setup with 10mm pitch screws and steppers then you don't have a ratio so it's 1:1.
Common pulley size is 20T. Don't go too small because there's not enough teeth engaged....