Belt tensioning ideas? (12 replies)

I need some advice. Again :)

I am in the middle of the process of designing and building my CoreXY printer. I started out wanting to build Hypercube Evolution, with linear rails mgn12h style instead of smooth rods, but in the process of making adaptations, entire design has changed a lot from HEVO. I don't think I should call it HEVO anymore. Anyway, I digress.

One of the biggest challenges for me was to come up with some nice belt tensioning system on my carriage. Because I was really determined to fit maximum build volume into the smallest possible frame, I do not have to much space to play with. And obviously wanted to keep X/Y gantry as light as possible.

So, this is what I came up with:




So, the concept is, that as I turn the screw on the other side of the carriage, that screw pulls teethed block inside, alongside with the belt.
Now, this solution is neither elegant nor particularly effective.

Care to give some tips? How did you do it? Any ideas?

Thanks