first time delta experience, autocalbration

johnjohn1990

Done a S8 autocal now

so basically i should run S6, S7, S8 and S9 as individual calibrations after eachother, ?

Dougal1957

no each one does something slightly different to each other in what is adjusted if you know your arm length accurately you should stick to either S6 or S8 S8 does the same as S6 but also adjusts for tower tilts should there be any IIRC

johnjohn1990

Dougal1957

you need to reset the M665 to have the measured rod length first

johnjohn1990

@dougal1957

did that, and now i get this, which is more right, with the standard settings which made perfect sized parts..

tried a 6 and 8...

that should be enough then? i just need to run a lot to get the deviation down

Danal

To recap:

You SHOULD have a PRECISE measure of your diagonal rod length "joint center to joint center" before calibration, and put that in M665 L before calibration.
If for some reason you do NOT have this, you can run one of the calibrations that sets rod length... and you should expect to run it over and over. It will take as many as ten or fifteen runs to settle on the 'tradeoffs' between the various parameters.
The better way is to set the rod length (M665 L) to the exact physical, and run the calibrations, such as 6 and 8, that set everything else, but do NOT attempt to adjust rod length. These style calibrations should only need to be run a couple of times to 'converge', meaning get a decent deviation.
If deviation won't drop below 0.05 (or better) even after several runs, something else is wrong. Slop, loose belts, loose hub on a motor, something.

And... as mentioned above... after you are happy with calibration, enter M500 manually. Then be sure M501 is somewhere near the end of config.g.

dc42

@johnjohn1990 said in first time delta experience, autocalbration:

@dougal1957

did that, and now i get this, which is more right, with the standard settings which made perfect sized parts..

tried a 6 and 8...

that should be enough then? i just need to run a lot to get the deviation down

Which firmware version are you using? There is a bug in 2.03 firmware that causes slow convergence when auto calibrating a delta. It isn't present in firmware versions 2.02 or 2.04RC1.

johnjohn1990

@danal said in first time delta experience, autocalbration:

To recap:

You SHOULD have a PRECISE measure of your diagonal rod length "joint center to joint center" before calibration, and put that in M665 L before calibration.

If for some reason you do NOT have this, you can run one of the calibrations that sets rod length... and you should expect to run it over and over. It will take as many as ten or fifteen runs to settle on the 'tradeoffs' between the various parameters.

The better way is to set the rod length (M665 L) to the exact physical, and run the calibrations, such as 6 and 8, that set everything else, but do NOT attempt to adjust rod length. These style calibrations should only need to be run a couple of times to 'converge', meaning get a decent deviation.

If deviation won't drop below 0.05 (or better) even after several runs, something else is wrong. Slop, loose belts, loose hub on a motor, something.

And... as mentioned above... after you are happy with calibration, enter M500 manually. Then be sure M501 is somewhere near the end of config.g.

yep i did that and it works! i kept the arm distance what i know it is - i cant measure more precise than the visibility of a difference in a mm scale.. i do not have calipers above 150mm... otherwise i could get it more precise.. but it is somewhere between 216 and 217mm... 216.5 is standard.. radius of 102 is also more exact, to what i have seen it can do, if i move it by hand..
could it be a shitty endstop? - using that as a probe, with the lever on it.. - i am intending to get something better..

@dc42 said in first time delta experience, autocalbration:

@johnjohn1990 said in first time delta experience, autocalbration:

@dougal1957

did that, and now i get this, which is more right, with the standard settings which made perfect sized parts..

tried a 6 and 8...

that should be enough then? i just need to run a lot to get the deviation down

Which firmware version are you using? There is a bug in 2.03 firmware that causes slow convergence when auto calibrating a delta. It isn't present in firmware versions 2.02 or 2.04RC1.

in fact i am running 2.03!
what exactly does that mean? other than i need to update, asap

johnjohn1990

i will say i am printing right now!

so, if i ever need to change my offset, i just home, jog down to where i want my new Z0, and then do a G92 Z0 ?
as said before, im used to an inductive probe, i have never had the need to use G92 in my case might seem a bit dumb, lol.. feels like that

and thank you VERY MUCH for giving you the time to cut it out for me youre just great

Danal

@johnjohn1990 said in first time delta experience, autocalbration:

yep i did that and it works! i kept the arm distance what i know it is - i cant measure more precise than the visibility of a difference in a mm scale.. i do not have calipers above 150mm... otherwise i could get it more precise.. but it is somewhere between 216 and 217mm... 216.5 is standard.. radius of 102 is also more exact, to what i have seen it can do, if i move it by hand..

Pre-made arms should have a sticker on them with xx.xx level precision.

could it be a shitty endstop? - using that as a probe, with the lever on it.. - i am intending to get something better..

Do repeated calibrations converge? Meaning below 0.05?

@johnjohn1990 said in first time delta experience, autocalbration:

i will say i am printing right now!

Fantastic!! By the way, I recommend a simple (probably 8 point) calibration before every print (if your probe supports that).