Belt tension
I am in the belt tension steps of my upgrade to Core One and am confused. I can get the correct upper belt tension by adjusting equally the screws using the Prusa online belt tuner. Then when I go to the lower belt its tension is low. Tightening both screws to get the correct tension causes the upper belt to increase out of spec. How can the belts be adjusted independently?
RE: Belt tension
They cannot.
How far out of spec? Make sure the motor pulleys are both installed correctly for the side they're on: they're not installed on the motor the same. Unsure what else might be a potential cause, this is just a common oversight.
RE: Belt tension
I am in the belt tension steps of my upgrade to Core One and am confused. I can get the correct upper belt tension by adjusting equally the screws using the Prusa online belt tuner. Then when I go to the lower belt its tension is low. Tightening both screws to get the correct tension causes the upper belt to increase out of spec. How can the belts be adjusted independently?
Has to be done carefully and methodically. I assume you are following this guide:Adjusting belt tension talking to other one of the most common errors (I got trapped by this as well) is plucking the wrong set of belts (must be done across the linear rail). Need to be very careful not to over-tighten and bend the gantry so it is no longer square.
RE: Belt tension
Yes, I did follow the Adjusting Belt tension guide. First I adjusted the gantry. I was careful to pluck the correct belt. If I adjust either screw independently to tighten the loose belt I will throw off the gantry alignment.
RE:
Both belts influence each other, there is no way around this. If you tighten the left screw, which is attached to the upper belt, the upper belt will be more tightened than the lower one, but it still increases. If you adjust the right screw, the lower belt gets more tightened, but the upper one also gets tightened a bit.
What wont work: Tightening one belt to get its frequency correctly while leaving the other belt loose.
What you have to do: Align the gantry as per the Prusa instructions, and after that start tightening both belts simultaneously. Turn the left screw one rotation, then the right one. Then the left one, then the right one, then the left one... While doing this keep plucking the belt and measuring the result. As you approach the correct frequency stop doing a full rotation, do only half a rotation, and then only a quater rotation. If the gantry remains straight and everything else is fine, the printer should naturally give you the correct result (98/92) by tightening both belts by the same amount. Small adjustments can of course be made by only turning one screw or turning the other screw to lower that belts tightness. But after adjusting only one belt you have to make sure that the gantry is still straight, so it touches both front adjustment thingies at the same time