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update belt tensioning on X end left and right
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Description

Need to update the ohai with information on how to tension the belts on the X end's left /right. Also add how to make adjustments if the belts are rubbing.

Event Timeline

DaniAO created this task.Apr 22 2019, 3:54 PM
DaniAO triaged this task as Normal priority.
DaniAO created this object with edit policy "LulzBot Hardware Products (Project)".
EricNugent closed this task as Resolved.Apr 30 2019, 1:44 PM
EricNugent added a subscriber: EricNugent.

@DaniAO is this in reference to the Z belts? The links that @logan mentioned all appear to show the proper methods for installation and adjustment. Closing this as resolved, feel free to re-open with further clarification.

This was brought up by Kent when reviewing the QA sheets with production. @kent would have the answers.

kent added a comment.May 1 2019, 9:40 AM

It has to check for rubbing at the frame QA checksheet but there are no instructions in the x-end or frame assembly instructions. I think it would make more sense if we put what is currently step 24 in the finals into a QA checksheet completion instructions at the end of the frame assembly, or maybe have it both places.

@kent does this need to be an Ohai change or is this something we are adding to QA?

kent added a comment.May 1 2019, 2:31 PM

@EricNugent the OHAI. It's already on the QA checksheet for frames, so we just need to add it to the OHAI.

kent reassigned this task from kent to EricNugent.May 1 2019, 2:31 PM
kent added a subscriber: kent.

@kent I guess I am just confused on order of operations here. Wouldn't it make more sense for only finals to adjust the belts on x ends after they install the x axis? Since we would be influencing the belt path with extra weight at that point? Having it adjusted at the sub-assembly and frame tier will may be repeating work that only needs to be done once.

kent added a comment.May 2 2019, 8:31 AM

Good questions. I don't think it changes the belt path when you add the x rods and toolhead and stuff but maybe it does and I've just never noticed it.

The idea is that the frame assemblers would set it and the finalist would just have to check it. If it changes a lot, I would suspect something else is going on like the compression hardware isn't set.

@wolffchadd have we noticed the belts changing where they ride on the z-idlers after installing the x-axis?

I have not heard anything of that nature. I have asked and was told that once the x-axis is set they don't really move anything.

paulette reopened this task as Open.May 21 2019, 10:41 AM
paulette added subscribers: robert, paulette.

There are still no steps added to the OHAI in regards to setting the Z-belt tension. This is a step that should be completed before it gets to calibration. Also, it should be communicated verbally to the assemblers when the change is made, so it is not accidentally skipped over.
@wolffchadd @kent @EricNugent @logan @DaniAO @robert

@paulette approximately how many machines are you seeing make their way to calibration with loose Z belts?

@EricNugent Not very many, I think many get caught when someone is going over the Frame Checksheet, but it should still be a process that a station should be responsible for. If it's on the checksheet, it should have been set/checked prior to that at some point.

@paulette The QA sheet for Finals has a step which might be too vague if we are seeing it slip through: The belts are aligned on the idler bearings and properly tensioned.

I believe @franklin and @oliver are currently speaking to the appropriate departments to ensure that the grub screws are not bottomed out when tightening the belt for the X ends. Hopefully this will help reduce the amount of machines that show up in calibration with loose belts.

@kent is also working on updating the QA sheets should this need to be updated.

oliver added a comment.EditedMay 21 2019, 1:42 PM

@paulette @EricNugent: @franklin and I talked to pre-sub and they agreed to stop sending down z-uppers flushed with the top of the plate. Hopefully this will allow the idlers to seat properly and tension the belts to spec.

Also an important note is that we can't actually tension the z-belts.

Please note that Presub was doing a build process that was requested by MER.
MER has now talked to us and asked us to go back to the original build method which we will be doing. This should address the issue that is occurring.

EricNugent closed this task as Resolved.Jun 5 2019, 10:05 AM

Closing this as resolved for the moment as clarifications on procedures have been implemented. Will re-open if this is found to be ineffective in the amount of machines that need re-tensioned on the x ends.