Ok, that is the set with the oversized holes. vertical distance should be 6",
not 5" (you can use one of the vertical arms as a pattern for drilling the
mounting holes)
given what we are seeing with the mechanism collapsing, I would drill the holes
out to be a tight fit with slightly larger bolts.
the latest iteration has slightly smaller holes, and a piece of stainless in the
center to set the mounting location more precisely (it also has 7" arms instead
of 5" arms and they are a lot thinner
I might have misspoke. The vertical distance is six inches. I have just completed taking it all apart and checking it out very closely. I am happy with the way I installed everything and I in the process of calibrating right now. I machined a piece of delrin for the top stand off - itâs a larger diameter and wonât allow the arms to index past the center - Iâll update you when Iâm done
I didnât have much time to play tonight, heading out for a business trip tomorrow AM but I ran into some weird issues with GC 1.10.
I decided that if there were some calibration improvements I would take advantage of those. So I restarted my calibration routine in 1.10 and got through the motor spacing measurement phase and then went to set the chain length andâŚthe motors spun the wrong direction? I stopped them and exited out, then went into the set chain lengths and the motors moved the correct direction. I did in fact, choose the proper chain direction in the prior step, my chain comes off the top. Minutes later, when I went to adjust my z-axis up and it moved my sled up on the board, not the zaxis??
I am going to jump back to 1.09 but, has this happened to anyone else? That was really strange.
Bar is doing some testing on his end to replicate and work on a fix. I too am buried in work this week, but I will try to see see it through on 1.11 unless I hear otherwise.
I was seeing this on 1.11 yesterday, though on a local branch so I blamed myself. Iâll try to zero in, but I was doing motor tests first thing after starting GC at the time.
edit - i thihnk iâve tracked my âfunniesâ down to a flakey USB hub. No trouble today since I got rid of that.
So I finished my frame modifications and started with another round of calibration today, moved back to GC 1.09 and FW 1.09. I still ran into the issue of the measurement between motors being incorrect. Losing about 5mm across the 473.3 links. So it seems like my machine is holding fairly consistent at 6.359 mm chain pitch. I did a little searching and it looks like the tolerance for ANSI roller chain is 0% to 0.15% so my chain would fall within that tolerance band at 6.35mm to 6.3595mm.
Finished the first part of the calibration and then, when I went to measure out the chain lengths the motors spun the wrong direction. I stopped it, and just went to the stand alone automatic chain measurement and it measured the chains out fine, motors turned in the correct direction. So I go back to do the calibration get to setting the z-axis depth and then the z-axis doesnât move but the sled moves down just like before.
I failed to reset my .ini file but I will do that in the morning. Just odd, like @blurfl said âfunniesâ or if you watch Westworld, we could call them âreveriesâ
I am totally hosed up now⌠Still back on GC 1.09 and FW 1.09 and I cannot complete the calibration cycle or use the z-axis.
I wiped the EEPROM, deleted the .ini file and removed any of the old versions of GC and FW that I had saved on the computer. I can get to the point where the calibration wants to measure out the chains and then, the sprockets spin the wrong direction. Additionally, when I try to move the z-axis up or down the z axis motor twitches and then the upper motors both spin.
The issue is 100% repeatable for me and I cant seem to get rid of it.
I had this same issue before I completed the calibration on 1.09.
For the calibration, the chains have to go over the top of the sprocket, I was planning on using the under sprocket mount and had to look to make sure that I was doing it correctly.
So, the problem with the sprockets spinning the wrong way is after you measured the distance between motors and itâs at the point it wants to spool chain out so you can attach the sled?
That is the point where you should be specifying which direction the chains
should go (âoverâ or âunderâ the sprockets), which one are you selecting?
Actually, thatâs the first question in the new calibration routine. I am selecting top (over) and that is the direction they go.
As I said, the oddest thing is that they move the wrong direction in the calibration only, if I switch to the automatic chain length (with top feed chain still selected) they go the right direction.
When you wiped and did a clean install (start fresh) did you ever, at any point, select bottom feed configuration somewhere or did you always stick with top feed? I ask because the only way I can see the sprockets to turn CCW is if GC/firmware thinks its in a bottom feed configuration. For instance, if you select bottom feed in settings and then select top feed in calibration and the setting update is not firing in calibration (for whatever reason), then the controller will think its in bottom feed configuration and may spin the sprockets CCW.
Finally got a little time with the Maslow tonight. I went from my pre-release 1.11 to the true 1.11 for GC and FW and got to testing. Based on a new measurement I took for my motor spacing I did a quick change to the spacing and corrected my chain pitch to match that value. Ran a new triangular calibration test. Then, for the first time ever, I ran the Calibration Benchmark Test and got the following results:
Overall, it doesnât seem TOO bad. A little bit odd to me that the right side is worse than the left side. A couple more adjustments I need to make and then this weekend I will be cutting a project for my little guyâs birthday. I changed my tactic a little in that I am going to cut one BIG version of the item instead of a bunch of little ones that each kid will take home.
Second project after that, a new sled to mount my freshly received ring kit on! Very excited to see how that works.
if one side is different than the other, look for something loose. when you are cutting on the side bottom, one chain is under almost no tension, while the other is supporting the full weight of the router.
when you are cutting on the side top, you are under quite a bit of tension on both chains, and so if there is ANY give in your motor mounts, you will see effects here.
