Yes, sorry, in a zero resistance situation, that’s absolutely correct. What I was trying to get at was that a heavier sled (with all the other variables constant) is one way to increase tension in the chains leading to better accuracy in those bottom corners.
Yes. But making the motor mounts too far apart will make the chain under much increased tension all the time. This means more stretch and faster wear of the chain, the sprockets and the bushings.
There is a compromise, but we will never arrive at it through qualitative discussion alone, vs quantitative calculation (even best-guess estimates are acceptable).
1 Like
After the holidays I was going to take a stab at incorporating chain sag and stretch into the kinematics, as a starting place. I’ll start working on that in the coming days.
1 Like
tilting the machine closer to vertical will also decrease friction
moving the motors a little further apart makes a big difference to the chain
angle as it gets close to the motor, but very little difference when the sled is
further apart. We are talking about another foot or so, not another 5 feet.
1 Like
hey @rjon17469.
How’s that going? Let us know how we can help. Thanks!
I have the algorithm designed and the firmware updates written and ready for a PR. I’m currently waiting on GC PR 547 to be merged first, as that new triangular calibration method will be modified to also calibrate chain sag.
1 Like
see pr#547 for the current discussion
1 Like