Belt tension… so which one is it now?  

RE: Belt tension… so which one is it now?

The web page is newer and most likely the app will be updated soon as well.

RE: Belt tension… so which one is it now?

For what it is worth, this topic Belts losing tension indicates that the web app is a new, updated procedure for tensioning the Core One belts.  Note that this will result in much higher tensions than the side belt method based on my experience.  With my belts adjusted to 84-85 Hz side tension I measured 78 lower and 80 higher with the front belt method.

Regards,

Steve

RE: Belt tension… so which one is it now?

So, some further thoughts now that I've actually tried the new procedure. First, the Gates Carbon Drive app is far superior to either the Prusa App or Spectroid in my opinion, with an extremely quick response and very clear indication of frequency (ignore the average calculated).  Select the "Bicycle" option in the app as it tops out at 100Hz and should result in better measurement accuracy.  Second, while the adjustment instructions don't point it out, and it is relatively easy to figure out, I will note that the "top belt" is adjusted with the Left adjustment screw and the Bottom with the Right.  I found it incredibly simple to hit the optimum target tensions of 98Hz top and 92Hz bottom.  Finally, the significant increase in belt tension did not appear to negatively impact the homing routine, nor did it pull the gantry out of alignment which sometimes happened when adjusting with the original "side tension" method.

Overall the new method is easier to use and seems to have resulted in a more reliable adjustment.  Time (and other's experiences) will tell if it had any impacts to print quality or other issues.

Regards,

Steve

RE: Belt tension… so which one is it now?

I would agree. the gates app is #1, but the belt connect web app from Prusa worked too. oddly enough I had tuned the sides belt to 85 took only about a quarter of a turn  of upper and lower adjusters to hit target values at the front, and as noted the procedure doesn't require contorionist moves to position the phone, plan on running the new firmware  update later today, all in all I have been lucky and this thing has worked like a champ since it came out of the box.

RE: Belt tension… so which one is it now?

With the increased belt tension, shouldn't everyone re-tune their input shapers? Except for the majority of Core One customers who did not buy the accelerometer at extra cost, of course. 😕

With phase stepping calibration now an official function, and belt tensions (and hence input shaping parameters) changing, I have a feeling that we will see a new Love Board with onboard accelerometer sooner rather than later. Which would also give Prusa the opportunity to fix the ground-bounce issue on the load cell signal, by routing its ground separately from the heater... 

RE: Belt tension… so which one is it now?

I did re-run both the phase-stepping and input shaper calibrations after adjusting the belts to the new values with the new method.  There was a minor shift (I think 1hz) in one axis for the input shaper but the phase-stepping result was not really impacted.

Regards,

Steve

RE: Belt tension… so which one is it now?

I found myself having to overtighten the belts when I tried the new method to reach the values outlined in the webpage tuner. Only when i got them both reading correctly, did I notice my gantry was massively skewed. Had been perfectly square prior! I gave up at that point loosened everything and went back to the old method to try and square things up again. I had already lost an hour at that point and just wanted to get some prints done. The new method should come with a health warning? Or a least a bit more instruction to avoid the same issue I had. My printer is at a height so without a step ladder it's hard to notice if it starts to skew.

RE: Belt tension… so which one is it now?

Posted by: @wdlandry

I found myself having to overtighten the belts when I tried the new method to reach the values outlined in the webpage tuner. Only when i got them both reading correctly, did I notice my gantry was massively skewed. Had been perfectly square prior! I gave up at that point loosened everything and went back to the old method to try and square things up again. I had already lost an hour at that point and just wanted to get some prints done. The new method should come with a health warning? Or a least a bit more instruction to avoid the same issue I had. My printer is at a height so without a step ladder it's hard to notice if it starts to skew.

I ended up the same an it bent the gantry enough that after releasing the tension and going back to 85hz, the gantry was off-square enough for the Y calibration to fail. I had to manually bend it back. In my case there was no way to get it in tune without the gantry being skewed as much as 8mm. 

RE: Belt tension… so which one is it now?

New method did increase the VFAs, of which I had very little before, also made it more difficult to have a square gantry/homing, and in the end it pulled out a belt from the extruder so I had to disassemble it and put it back in (probably not 100% seated i assume). So went back to just have them there tensioned without any app just by feel, and it works great again, i didnt find my printer especially sensitive to belt tension, sloppy uneven tensioned prints created great results somehow 🙂

RE: Belt tension… so which one is it now?

In my opinion one has to leave about 10mm space to the „front stops“  when using the new method, otherwise one will screw up the squareness