Speaking from personal experience of the 5th gen, unfortunately I think
it's likely to be a design issue.
That wheel is mounted on a standard threaded bolt. So it doesn't take a
lot of imagination to know that if continually turned in a particular
direction it will reach the end of the thread - and fall off. No comment
on the amount of force required as I didn't suffer that problem.
What I DID realise was that when the wheel started to exhibit looseness
(as it neared the end of the thread travel), it was time to fully rewind
that wheel in the opposite direction - and then do the levelling bit.
The actual levelling does not depend upon the physical position of the
wheel on the threaded shaft. The bot just says "twiddle the knob in this
direction" (shows a picture on the bot's control panel), you do so and
before long the bot says "got it".
Now what I thought was happening was that the firmware within the bot
was doing some hocus-pocus to figure out the levelling - which was not
dependent on the physical position of the wheel on its threaded shaft.
The impression I got was that the wheel did not adjust the physical
level of the build plate - like it does on other machines where a spring
is pushing the plate against the wheel.
Bottom line, before levelling wind up the wheel to the top of its
travel. The bot will level somewhere in its mid-range of adjustment. And
you won't get to have the wheel fall off.
Just my tuppence worth.
On 06/08/2014 21:39, Jetguy wrote:
> Sorry, please take ths as trying to be helpful.
>
> So the problem was created when you literally CRANKED THE CRAP out of
> the knob, clearly when it had bottom out, SO HARD, that is stripped the
> brass insert now right out of the plastic knob.
>
> Now granted, you were trying to follow the instructions but this was an
> example of user error.
> The takeaway for OTHER users is do not force anything just because you
> think you need to turn it more.
>
> I'm not saying that maybe the insert was loose from the start or
> whatever, but now, clearly from the photo is it jammed tight against the
> HBP and has stripped out the hole in the knob. The only way that could
> happen is you the user cranked the knob up until it stopped and then
> kept cranking.Again, if you cannot unscrew that with pliars, the ONLY
> way we could get to this state is pure user error in cranking that knob
> as hard as they could.
> I seem to remember a LOUD screaching sound in the video you guys posted
> the first time while you were spining the knob. That was the point of
> destruction right there.
>
>
>
>
> On Wednesday, August 6, 2014 4:12:29 PM UTC-4, Jon Froehlich wrote:
>
> Thanks for the nice discussion everyone. We are starting to get to
> the bottom of the problem. Essentially, the metal grip on the front
> knob got stuck on the front leveling plate screw and is now
> functioning as a nut/fastener. It is fixed pretty tightly on the
> screw. After calling support
(+1347 334 6800[Call:
+1347 334 6800]
> <#>, thanks Jetguy), they suggested we try and use a needle-nose
> <
http://www.leevalley.com/en/images/item/hardware/jigfixtureparts/00m5010s4.jpg>
> <
http://youtu.be/7oAJTbPtA-g>
>
> <
https://lh3.googleusercontent.com/-CMHqaDB4xhE/U-FRceBMbcI/AAAAAAAAACw/j6uFIah5t5g/s1600/photo.JPG>
>
>
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