Accuracy: Expectation vs Reality

Software Ground Control
6

  1. @bar I saw in an old post you were measuring perfectly round circles Fully Calibrated but Oblong Circles - #43 by bar . Do you have your benchmark numbers I can compare to?

  2. Is anyone using the Chain Tolerance?

    • Does Chain Tolerance help with accuracy on cuts or is this just to get the Maslow to accurately measure distance between motors(match the manual measurement)?

nobody is using chain tolerance much yet as it hasn’t been released, but it will
affect accuracy as well as the measurement of the distance between the motors.

if the distance between the motors is off by 10’s of mm, then the length of the
chain from motor to the sled can be off just as much.

  1. Where do I go from here to shoot for better accuracy?
    • Adjust the motor to motor to my manual measurement?

yes, and set the chain tolerance so that the chain measured value matches the
real distance.

* If I do this, do I need to run the Triangulation test again to update
chain sag and rotation radius? It looks like I get a different chain
sag/rotational radius each time I run the calibration.

Yes, after changing anything significant about the machine, you need to re-run
the calibration.

since the calibration requires imprecise manual measurements, it’s not
unexpected to get slightly different numbers each time. how much do they vary

* If I have a unrealistic expectation on accuracy and my numbers look good, just tell me to shut up :grinning:

we are still working to figure out how accurate we can make the machine.

As we solve one problem, we run into the next one. We don’t know how accurate
the machine can be with the chain tolerance factored in, so we don’t know where
we will be after that.

pretty much all the problems (and their fixes) have been the result of people
trying to be accurate and running into problems and our exploration about what
is odd about their situation and how to account for the variability.

3 Likes