I figured, there are no ressources to how long the lead-screw nuts actually hold up. So i made a video of me measuring my printers nuts.
Also, i had the idea, maybe others want to jump in and build somekind of database of measured nut play and we build a list. Also i think a video is neccesary to build a somewhat trustworthy list. Also it is worth noting, ofcourse service and oil can change the lifespan of them but this is all about dry data.
FYI, Support sent me new rods based off of this video.
With the number of issues people have been having with the lead screw nuts that I’ve seen, I’m considering just swapping over to igus nuts at this point. They seem to be the one weak point we have.
Anyone have some top-down pictures and dimensions of intact nuts?
Igus is actively consulting people needing those nuts, you should contact them, im on the meh, polymer nuts boat but i can be proven wrong ofcourse. They know we crave them nuts
I got click sounds on Z hop. i guessing they gave this huge amount of back lash to tolerate expansion of heated bed. i assume click sound means bed hits hard to nut on z hop with its weight because your measurement shows it has too much distance that can move. probably its better to limit Z acceleration and speed to reduce wear on back nut
You literally measure wear on those nuts, by play.
I wont turn down my acceleration on Z, i will just go to support and order another set on warranty. Maybe even up my acceleration so they wear faster to remain in warranty.
Is that how much backlash you are getting from this machine? How many hours? For a machine they claim can do 50 microns or about 2 thou right? And if i am reading your dial indicator right your getting like 25 thou is that right?
A brass led nut is measured for wear in the following way:
Fix the nut from spinning, pull it to one side, mark 0 pull it to the opposite side and note the measurement. Done, you now have measured wear on a brass lead nut ( or any other positioning system in the same regard ) this is common industry standard, nothing to do with what the accuracy claim is.
Simpliest method with nuts installed, dial indicator mounted on tool head, move near the nut you want to measure. Zero the indicator, press up on bottom of heated bed with one finger (Light pressure). Note the change in indicator, common numbers are 0.2mm for light wear, 0.5 for moderate wear, anything greater start ordering parts…
Light pressure, If you push hard you can get any number you want, I am not sure what flex’s.
I described the exact way on how you measure a leadscrew nut or a ballscrew nut on a motion system. Shure you can achieve this in many ways like moving the bed, undoing everything but it stay basically the same principle. The nut is stopped from movement and then pushed to one side, zeroed, pushed to the other side, measurement - initial installation measurement = wear, this then you check with manufacturers on how much tolerance they give on wear and decide if its worn to replace or not. No hard feelings, just measurements and decisions.
This measurement is also applyed for machine beds, cnc ways, lathe ways, you get the idea its no magic wizardy, its like unlocking a car door to enter the car.
I dont know if you saw the video but im pretty shure i measured correctly, i have no clue why i am 3 comments in and still people talk about how to measure wear on nuts when its basically not the point in any sense at all of why i am here. I mean shure we can discuss another 2-4 months about how wear is measured, this threat is dead anyways as it seems nobody wanted to participate or shed light in the dark spots of bambu and or get a clear understanding on when the nuts start to fade on how many hours. Too much details i guess just rip open another printer box and throw the old one in the trash Im in the wrong community for stuff like that
Im in the wrong community for stuff like that