I googled a good lubricant for abs plastic and it came up with lithium grease. But since I started using it to lubricate my spools I’ve had no end of trouble with the belts coming out of the spool grips (despite the superglue). The belt end seems to pull thin (the teeth are massively stretched) and then pull out. What’s worse is that as the spool spins it can somehow still catch the belt so it appears to work. Does anyone know if lithium grease attacks superglue? (I’ve gone over to silicon lubricant. I will see if that’s any better.)
it sounds as if you may have excessive tension in your system. if you look at
the anchor locations and then measure the distances with a tape measure, do they
seem plausible?
Anthony Huggett wrote:
David,I’ve done a fresh calibration and everything looks sensible in terms of anchor locations. The only thing I noticed was about 5 mm of twist in my table over 3m of length. Does the calibration algorithm account for twist and would it make a difference?
Anthony Huggett wrote:
David,I’ve done a fresh calibration and everything looks sensible in terms of
anchor locations. The only thing I noticed was about 5 mm of twist in my table
over 3m of length. Does the calibration algorithm account for twist and would
it make a difference?
twist of the belt? if it isn’t twisting all the way around and is just leaning,
that should not matter.
what is your max current setting for the calibration?
David Lang
David, twist in the table - deviation from a flat plane, measured by looking across the table from one side and seeing that the far edges are not quite parallel. My belts are straight and untwisted with almost no difference between the heights of each end and the spool.
I’ve just performed a successful calibration with a retraction force of 650 (the calibration force having disappeared in V1.21). Then I raised the sled, brought it to the side (1m away from centre point, well within the cutting zone). Disaster! One belt has ripped out of the spool, another snapped the sensor roller. I’m currently on the third dismantle-sand spools-rebuild cycle for this weekend, and I haven’t cut anything yet! All I’ve done is a couple of calibrations to see if I can solve the tension problem and some trace perimeters (successful but too much tension).
twist and twist back is not a problem
do you have the log from the calibration run?
650 is good and low, I haven’t heard of the belts pulling out of the spool like
that before @bar ???
David Lang
I don’t have the calibration log, sorry. I tried several times, every time the left-hand side was “flying” - the tension was so great that the sled tipped (TR vs BL at top and bottom of the stack). Then I tried the interstitial firmware release and the tension now seems much reduced. I enjoyed several hours successful cutting thereafter.
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