Wrong scale on Y-axis

[trifonov]

Hello!
I just cleaned my Qualitech 9G 530 at New Year holidays.
After i put things together it started to scale Y-axis up to 10% more than X. (If i engrave square 50x50 i got 50x55).
I'm adjusted step scale in software and it starts work better. But if i engrave and then cut - cut is not aligned very well to the engraving. And engraving still not perfect (attached while with demo seal: it's slightly distorted). So i think there's a problem in mechanics part but cannot manage what.

What can be wrong? What should i check?

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[trifonov]

Here's update with test chart. It seems that it randomly adding/skipping steps. Chart cutted in random order and some circles shifted up, some down. All lines should touch each other in original file.

[trifonov]

One more update =)
Here's squares 5 x 5. As you see it's goes somehow normal from 1 to 12, but at 13 scales a bit up, at 15,17,19 scales lot more but scale is the same. The picture is always identical.
Changing belt tension change amount of distortion but didn't eliminate it.

What it could be? Please help.

[trifonov]

New update!
There should be a grid with 1x1 squares. But in result i have squares that slightly increase size when going side to side and resetting when it goes to new row. Totally confused.

[Blackened]

If you are loosing steps since you cleaned your machine, then it stands to reason something changed when you cleaned it.

I'd suggest writing down EXACTLY what you did when you cleaned it. Then go through and check everything you touched.

If you cleaned the linear guides, did you reapply lubrication? Did you change any tensioners? Is something knocked out of square?

I think you'll have to be methodical and check everything to narrow down the problem, you are the best person to solve this, as you are the one who knows what you might have altered.

Good luck

[Jerrywu]

1.whether the X-axis beams was paralleled?
2.Y-axis belt tension was the same?