Hello,
can someone explain to me what is the reason for that 0.1mm Resolution setting setted to the Layer Height to 0.105 or that 0.2mm Setting setted to the 0.2025 ? How do you calculate this? What would be the right Setting for the 0.05mm Resolution? Thanks.
Regards
Niyazi
Hi,
Z-axle has pitch = 1.5 mm /turn
stepper has 200 steps/turn
1.5/200=0.0075 mm/stepp
0.1/0.0075= 13.333
take 14 -> 14*0.0075= 0.105
0.05/0.0075= 6.7
take 7 -> 7*0.0075= 0.0525 mm
regards
[quote=“largab”]Hi,
Z-axle has pitch = 1.5 mm /turn
stepper has 200 steps/turn
1.5/200=0.0075 mm/stepp
0.1/0.0075= 13.333
take 14 -> 14*0.0075= 0.105
0.05/0.0075= 6.7
take 7 -> 7*0.0075= 0.0525 mm
regards[/quote]
Hello largab,
you explained this very clear.
Thank you.
Regards
Niyazi
[quote=“niyoki”][quote=“largab”]Hi,
Z-axle has pitch = 1.5 mm /turn
stepper has 200 steps/turn
1.5/200=0.0075 mm/stepp
0.1/0.0075= 13.333
take 14 -> 14*0.0075= 0.105
0.05/0.0075= 6.7
take 7 -> 7*0.0075= 0.0525 mm
regards[/quote]
Hello largab,
you explained this very clear.
Thank you.
Regards
Niyazi[/quote]
And in addition, when we take microstepping (1/32) into account, there are 200*32=6400 steps/turn
Therefore the z-axis resolution is 1,5mm / 6400 = 4266,66666…
Being so, the desired layer thickness of 0,1mm is 426,666666… microsteps
and when rounded to 427 full microsteps the resulting z movement is 0,100078125. (or 426 steps, not sure how it is rounded)
The error is 0,000078125mm which plays no role in layer accuracy as we are talking of nanometers now.
So it is totally OK to use exact 0,05mm, 0,1mm and 0,2mm layer values as we are using microstepping.
[quote=“ronkeli”]
And in addition, when we take microstepping (1/32) into account, there are 200*32=6400 steps/turn
Therefore the z-axis resolution is 1,5mm / 6400 = 4266,66666…
Being so, the desired layer thickness of 0,1mm is 426,666666… microsteps
and when rounded to 427 full microsteps the resulting z movement is 0,100078125. (or 426 steps, not sure how it is rounded)
The error is 0,000078125mm which plays no role in layer accuracy as we are talking of nanometers now.
So it is totally OK to use exact 0,05mm, 0,1mm and 0,2mm layer values as we are using microstepping.[/quote]
Yes, that’s right.
NO, thats wrong!!!
Forgett microstepping. Gives none accuracy. Only 200 real steps every turn.
http://www.micromo.com/microstepping-myths-and-realities
You can use microstepping in acceleration and retardation, but dont work well in positioning.
Largab, indeed it does not provide any improvement in achieved accuracy due to reduced torque.
The question seems to be whether z-axis uses microstepping for positioning or not. I don’t know…
If not then there are 200 steps/turn and if yes there are 6400 steps/turn, right?
And if yes, would it be better to disable it or at least reduce microsteps to increase torque for z-axis.
Anwyay I would not care about anything more accurate than 0,01mm as such accuracies are very challenging to manufacture and measure even with high quality professional machinery.
[quote=“largab”]NO, thats wrong!!!
Forgett microstepping. Gives none accuracy. Only 200 real steps every turn.
http://www.micromo.com/microstepping-myths-and-realities
You can use microstepping in acceleration and retardation, but dont work well in positioning.[/quote]
That article really don’t quantify what advantage/disadvantage microstepping gives in relation to positioning.
In any case: IF the Vertex uses microstepping for Z (does it?) then you would actually have a problem with respect to the above no matter what layer height you are using as it is highly unlikely that Z=0 is at the 1.8 deg full step intervals. Unless of course the positioning error is always the same for a given amount of microsteps from an full step (not likely). So if the microstepping error is actually worse than the full step error it would make sense to disable it in the firmware/hardware (if possible) and “live” with the (up to) 7.5 um bias in the initial layer (I wonder if any glass is actually that flat anyway).
Since DEFAULT_AXIS_STEPS_PER_UNIT is 4266.66 for Z it seems that the Z-axis does indeed use microstepping.
I have a problem with support ( Pass4sure ccie security ) material. On the photo you see an overhang circle. These thing need support. I’ve tried touches bed and all over but no one works. It display no support. I slice with Cura in ReptierHost.
[quote=“largab”]NO, thats wrong!!!
Forgett microstepping. Gives none accuracy. Only 200 real steps every turn.
http://www.micromo.com/microstepping-myths-and-realities
You can use microstepping in acceleration and retardation, but dont work well in positioning.[/quote]
Just take a look at the datasheet for the prcision of full steps. most motors lie in 3-5%.
That’s way more difference than uneven microsteps can give you.
cheers,
Christian