I don’t know code. And I don’t know the answer, but I’m pretty sure that I know where the problem is.
After I measure with the chain, from the left side, I am left with the following situation: About 3045mm of chain running from the top of the left sprocket, to the right, along the top beam, to the top of the right sprocket
AND about a foot of chain going from the top of the left sprocket, TO THE LEFT, looping down and up, and ANCHORED into the top beam by the nail that I originally used to connect the chain WAY back in the “build the default frame with down feed to sled instructions”, but which I had to undo to follow the calibration instructions. Here it is:
BUT, if I’m going off the BOTTOM (so my chain doesn’t have to cross itself), then my anchored end…
HERE’S THE PROBLEM
… the ANCHORED end, should probably NOT BE ANCHORED. Because when the left sprocket retracts in order to get a “known length” of chain, I’m left with a big ANCHORED loop coming off the bottom, and the loose chain (ostensibly the end to be connected to the sled) STILL IN A TOP CONFIGURATION. So…
I may have missed the “take chain off of nail,” instruction but I don’t think so, and it’s not intuitive, because the instructions are very detailed.
My theory would explain the common problem of “the chain retracting in the wrong direction,” yet the code actually being correct. The code is working correctly, but on the wrong configuration/perception of the chain. So… garbage in, garbage out. I think that my theory might also explain why so many people having this problem. They, like me, are simply looking at the WRONG END OF THE CHAIN. This misperception is ONLY because the other end of the chain, which SHOULD be the woking end, to attach to the sled, is still anchored.
If the % of people having this problem in the calibration is proportional to the number of people configuring their machine with a “bottom feed,” then this is the problem.
I can’t tell, because I don’t KNOW how it’s SUPPOSED to work.
But there are about 1,000 people on this forum that do.
So, I’ll have the answer soon!
Thanks all. Joe