gwen wrote:
Is there some doc where I could learn more on :
- How to correlate the fitness with the quality of corners location estimations (I know about GA, but how do they are applied within the calibration phase)
- What are the ‘stiffness talues’ TLBR & TRBL representing
short answer, no 
longer answer. we don’t know what exactly these things mean yet.
the fitness score is an estimate of how accurately the anchor locations are. It
is not used for anything other than reporting to the user at the end of
calibration.
the stiffness value is just a measurement of how much the frame flexes when it’s
pulled.
How much this matters will depend on how hard the sled pulls during cutting.
The faster you go, the harder you have to pull.
An upright frame will pull harder (because it has to fight gravity) than a flat
frame
The more friction between the sled and the workpiece, the harder you have to
pull (are you sliding on OSB or a laminate coutertop)
the duller the bit you have, the harder you have to pull
and the bottom line is that we don’t know how accurate you need the machine to
be. Bar does most of his cutting on a frame that’s “too small” and “too
flexible”, but it’s good enough for the things that he makes. If you are making
something with interlocking notches, you will probably need more accuracy than
Bar does.
Also, another point (not in the right forum section, sorry) : it becomes more
and more difficult to retract belts, I have to press the button dozen of times
now to fully retract, and while doing so I can hear noises sounding like some
plastic parts are difficultly moving. Is that a classic issue over time ?
The maslow 4.0 has a couple known issues (fixed in the 4.1 parts)
-
there is a c-clip on the motors that can rub on the arm, creating plastic
dust that can get into the works
-
the nuts on the inside of the arms can rotate slightly and rub against the
spool, causing friction and plastic dust.
-
the idler gears can wear and take more force to turn.
As this dust interacts with any lubrication it turns into a paste and gums
things up. Take your arms apart, clean them, look for wear, and reasseble them.
David Lang