Uneven bolt tension for X and Y
Hi there,
I just updated to Firmware 6.4.0 and wanted to test the new bolt tension calibration via vibrations. After selecting the correct values I just got an error, that my values are out of range. After using the "old" method with app and sound frequencies I have a difference of 11Hz (maximum should be 8). Currently my upper belt is at 104Hz and the lower belt is at 93Hz.
I followed this guide and checking if my gantry has no gaps. Seems to be aligned perfectly, because both sides touch the other part, even without pressure. Then I tried to align the tension via screws. If I adjust evenly the gap between both bolts stay the same, they just increase or decrease overall. If I just adjust one screw the gap closes, but the gantry isn't aligned anymore.
After this I followed extensive adjustment guide in the end, completley dismounting my Nextruder and checking the belts. They are both showing 4-5 teeths on both sides, like the manual mentions. So this should be fine.
Does anyone have an idea how to reduce the gap between bolt tensions? Is this even a problem? My prints seems to be fine, but I don't know if they could get even better?!
Thanks!
RE: Uneven bolt tension for X and Y
With the belts completely loose, double check the gantry alignment again. Then when you tighten the belts you must turn both screws an equal amount. So you start with the left screw with 2 turns, right screw 2 turns until the belts start to get tension. Then left screw 1/2 turn, right screw 1/2 turn until the belts are in range. Then 1/4 turn left, 1/4 right, 1/8 left, 1/8 right. If the belts are too tight the loosen both screws 1/8 of a turn at the time. Never adjust the screws independently of each other.
As long as both belts are in the 90's you are fine. They don't need to be exactly 98/92hz. Trying to match that frequency by unevenly tightening the screws will bend the gantry.
Also, just like checking the air pressure in your car tires periodically, it's a good idea to check the belt tension periodically. I check it once a week.
RE: Uneven bolt tension for X and Y
Ignore the frequency of the belts.
Start with the tensioners loose and ensure that there's no gap on the gantry.
Then, tighten each screw equally until you get into range. If you're seeing a gap appear while tensioning the belts, then you're unevenly tightening them and pulling the gantry out of square. Use the same number of turns for each screw. I start with full turns to get things started, then back down to half then quarter turns.
The absolute frequency of the belts isn't important. They just need to be "in the ballpark" (close enough) while not imparting uneven tension on the gantry.