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Calibration question

Started by slurm, August 15, 2018, 08:17:49 pm

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slurm


So I have been on a steep learning curve and have managed to get my kit delta mini kossel assembled and mostly calibrated (only taken over 2 years)

I have got through most of the calibration but am stuck on an issue. My z height is around 301 yet if I home it to the top and then manually bring the extruder down using rep host it hits the bed at around 400. How do I adjust the travel per mm.....

thanks

Gaza07

What printer is this and what firmware are you running ? it sounds like the height is setup wrong in your firmware
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 330mm build area
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 180mm build area
AnyCubic 4max XY printer 210x210x300 build area
AnyCubic Kossel Mini 180x180x300 build area
Geetech A10M Dual Colour 220x220x260 build area
Kelant Orbeat D100 DLP/SLA

http://www.multi-rotor.co.uk
https://www.thingiverse.com/Gaza07/about

slurm

yes that's exactly it, im using Arduino/marlin on a delta mini kossel I bought about 2.5 years ago...

382 on rep is 301 in real world measurements, just don't know how to change

im guessing its in these lines:-

// variables to calculate steps
#define XYZ_FULL_STEPS_PER_ROTATION 200
#define XYZ_MICROSTEPS 16
#define XYZ_BELT_PITCH 2
#define XYZ_PULLEY_TEETH 20

// delta speeds must be the same on xyz
#define DEFAULT_XYZ_STEPS_PER_UNIT ((XYZ_FULL_STEPS_PER_ROTATION) * (XYZ_MICROSTEPS) / double(XYZ_BELT_PITCH) / double(XYZ_PULLEY_TEETH))
#define DEFAULT_AXIS_STEPS_PER_UNIT   { 80, 80, 80, 760 }  // default steps per unit for Kossel (GT2, 20 tooth)

Gaza07

What version of marlin are you using ? is this a anycubic kossel I used to have one, there should be a section in there were you put in the height manually, I know ones of the guys on the forum made up a switch and managed to get the auto level working,
I havent messed with marlin for quite some time both my printers are on reprap, but if you let us know the version we may be able to help  ~~
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 330mm build area
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 180mm build area
AnyCubic 4max XY printer 210x210x300 build area
AnyCubic Kossel Mini 180x180x300 build area
Geetech A10M Dual Colour 220x220x260 build area
Kelant Orbeat D100 DLP/SLA

http://www.multi-rotor.co.uk
https://www.thingiverse.com/Gaza07/about

slurm

im using 1.6.13 and rep 2.1.3

I could cheat and reset the height to 382 (its really 301mm measured) and work from that, but im guessing everything I print will then come up short.

when I measure the x/y distance to rep its 50mm in rep to 49mm measured, so not too bad... its just the Z axis thinks its bigger than it actually is.

this was a cheap Chinese mini kossel delta kit from ebay/aliexpress from 2.5 yrs ago...support seem sketchy at best, things have moved on from that.

I do appreciate yours or anyone else help....as its just this that's really stopping me from testing prints some blocks....

Gaza07

August 16, 2018, 05:09:38 am #5 Last Edit: August 16, 2018, 05:50:44 am by Gaza07
do you mean v1.16 was the firmware factory installed ? or did you install it ?

Under configuration.h the line below is where you set the z height for the machine you find this using pronterface and then edit the line in the firmware

Code Select
#define MANUAL_Z_HOME_POS 332.3  // Distance between the nozzle to printbed after homing

I'm just thinking that the stepping should be right if its factory installed and looks about right from what I can remember from my anycubic days
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 330mm build area
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 180mm build area
AnyCubic 4max XY printer 210x210x300 build area
AnyCubic Kossel Mini 180x180x300 build area
Geetech A10M Dual Colour 220x220x260 build area
Kelant Orbeat D100 DLP/SLA

http://www.multi-rotor.co.uk
https://www.thingiverse.com/Gaza07/about

slurm

Thanks Gaz. I get how to set the height what I don't get is how to correct the fact that my true distance between nozzle and bed is 301mm yet to get the nozzle down to the bed I have to travel 382mm in repetier.

I don't know how to calibrate true distance to rep distance, im guessing it's in the 80 steps part but can't seem to find much in it.

I have uploaded my board using marlin 1.6.13.it's a mega 2560.


Gaza07

August 16, 2018, 08:39:36 am #7 Last Edit: August 16, 2018, 08:42:53 am by Gaza07
Where did you get the firmware from was it setup for your printer ? or even for a kossel printer although if your x y z move as they should it must be


the steps 80,80,80 should change how much it moves try a lower number and see what it does, alter the 80s to 40 I know thats a silly amount but it cant hurt and will show a huge difference or should do, have you counted the teeth on your pulleys this would also affect it

You got any pictures of your printer ? it might help to identify it
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 330mm build area
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 180mm build area
AnyCubic 4max XY printer 210x210x300 build area
AnyCubic Kossel Mini 180x180x300 build area
Geetech A10M Dual Colour 220x220x260 build area
Kelant Orbeat D100 DLP/SLA

http://www.multi-rotor.co.uk
https://www.thingiverse.com/Gaza07/about

slurm

ok, but wont that change the x and y dimensions on rep too?

Gaza07

Yea it will are they moving the correct amount then ? I would of thought if it was the stepping thats out it would be out on all 3
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 330mm build area
Custom built delta with Flex3Drive Gen 4 / Duet Electronics 180mm build area
AnyCubic 4max XY printer 210x210x300 build area
AnyCubic Kossel Mini 180x180x300 build area
Geetech A10M Dual Colour 220x220x260 build area
Kelant Orbeat D100 DLP/SLA

http://www.multi-rotor.co.uk
https://www.thingiverse.com/Gaza07/about

slurm

changed it to 69.3 and its was worse so went the other way...101.33

bingo for z access

problem is now the x and y are moving 60mm for 50 in rep.....grrrrr

slurm

this picture was taken ages ago before I finished it.


slurm

I have seen a script where someone had different steps for each axis, is this ok? I read they should be same for all 3

slurm

movement was down and forward, its clear for a delta they need to be the same.

slurm

think I have fixed this, delta radius was out, then changed all the steps to get Z axis correct, then adjusted the diagonal rod measurement which changes the x and y axis ratio. what a learn....

bed is now level too and no rise/drop on x/y.

Extruder next to test now, but if that's out then that's and easy change.

I will start to mess around with PLA tomorrow if all goes to plan.

Thanks for your persistence Gaz, much appreciated,  I have more questions....any tips, nozzle from bed height for a 1.75mm filament? flowrate to feed rate? so many questions...........


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