Probleem met Z-as - hoogte verloopt gedurende bewerking

[robertH]

Hoi,

Ik heb een probleem waarbij ik niet achterhaald krijg waar dit precies uit voortkomt.

Het lijkt alsof de Z as soms stappen mist (of gewoon in zn geheel niet aangestuurd wordt) op het moment dat deze naar boven beweegt ( op een gegeven moment sleept mn freesje of boortje door het materiaal terwijl USBCNC aangeeft dat de machine op safe Z hoogte zit).

Mijn setup:
Cam bestanden maak ik met Aspire
USBCNC met ethernet
leadshine DM856 drivers
Shielded cables naar nema23 steppers.


Ik heb het volgende gechecked:

- koppeling tussen spindel en motor slipt niet.
- ik kan met mijn eigen kracht de Z as niet stoppen wanneer deze naar boven beweegt.
- motoren en driver worden niet heet
- acceleratie van assen omlaag gegooid, geen verbetering.


Wie heeft er ideeen waar dit vandaan komt?

Groet,

Robert

[robertH]

Net nog een test gedaan.

een gaten patroon geboord. Na elk gat zit de boor dichter op het materiaal.
Daarna nogmaals hetzelfde bestand geboord, dus de boor had deze keer geen tegendruk van het materiaal (omdat de gaten er al zaten). Maar er gebeurd precies hetzelfde.

Ik hoor overigens geen rare (brommende) geluiden uit de stepper, klinkt gewoon soepel.

[Arie Kabaalstra]

je hebt of stappenverlies, of slip.. andere smaken zijn er eigenlijk niet.. post je NC bestand voor de grap eens.. grote kans dat daar ook geen fouten inzitten.. als de besturing iedere keer aangeeft dat ie op de goede Z/hoogte staat..

[robertH]

Code: Selecteer alles

( Drill  4mm D22 )
( File created: Sunday December 20 2015 - 07:03 PM)
( USBCNC Postprocessor )
( Material Size)
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(Drill  4mm D22)
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%

Maar waarom is het stappenverlies zo constant naar beneden? (na het boren van 12 gaten is de Z 6mm gezakt, en dit lijkt geleidelijk te gebeuren) De stepper heeft meer dan kracht genoeg om de freesmotor omhoog te tillen. En ik weet vrij zeker dat de spindel as niet slipt t.o.v. de motor as..

[Arie Kabaalstra]

aan je bestand ligt het niet.. gaat na elk gat keurig naar Z6.. dus moet het slip of stappen verlies zijn.. als ie bij elk gat een paar stappen verliest.. dan ga je..

[pcpiet]

hallo
ik heb precies het zelfde gehad bij mij bleek het tandwiel te slippen bij gewoon frezen geen probleem .
maar bij 3d werk met korte grote versnellingen slipte het tandwiel toch echt door .
door met de hand er aan draaien was het niet voelbaar ik zou alles nog maar eens extra nalopen
gr piet

[Flupke85]

Probeer eens een streepje op je as en koppeling te zetten... Dan zie je of hij slipt als het streepje verloopt.
Ook zou je de feedrate een naar beneden kunnen gooien en kijken of het dan is opgelost...
Ik heb een vergelijkbaar probleem gehad met het laten staan van nokjes zodat het werkstuk niet los komt te liggen...
Na elk nokje zakje de Z een stuk en uiteindelijk liep de spantang over het materiaal heen. Bij mij was het stappenverlies zonder het te horen.

[Arie Kabaalstra]

Stappen verlies hoor je ook niet altijd.. engine stall.. dat hoor je.. maar als je in ijlgang omhoog loopt.. en je raakt een paar stapjes kwijt.. hoor je niets van.. tot je teveel stappen kwijt bent.. en dan is het te laat..

[robertH]

Oke heb nu mn Z as uit elkaar liggen. De koppeling zit er wel echt goed opvast gedraaid, maargoed zal morgen voor de zekerheid van die locktite lijm ertussen doen. Had al eens een streepje op de spindle as gezet en op de koppeling, deze was niet verlopen, dus mogelijk alleen tussen de motor as en de koppeling.

Ik zit nu nog even te checken welke stroom de motor mag hebben en welke stroom er ingesteld staat op mijn drives.

In de datasheet van mn stepper staat in Bipolar - parallel mag deze 4.24 Amps/Phase hebben.

Mn stepperdriver staat ingesteld op peak current 5.6 A en RMS current 4.0 A. Is de stroom dan misschien te hoog?

[robertH]

Probleem opgelost!

- Mn reserve stepper motor gemonteerd, de oude draaide wel heeel soepel? (te heet geworden ofzo?)
- Koppeling verlijmd met de motor as.
- Stroom van mn drivers naar beneden gesteld.

Nu verlies ik geen stappen meer gelukkig.

[audiomanics]

Gewone stappenmotoren mogen best wel heet worden.. Als hij 60 graden is, dan hou je 'm niet meer beet.. Bij 100 tot 120 graden voelt een stappenmotor zich ook nog heel prima.
Ik denk dat je de stroom zo hoog kan instellen dat de motor behoorlijk warm wordt na een half uurtje (ca 50 graden ofzo) Je moet om dat te kunnen meten wel even de stroomreductie uitschakelen op je driver.. Anders blijft hij gewoon koud..

Kees

[robertH]

In de datasheet staat max 80 graden Celcius. Maar het zou kunnen dat de motor wel zo warm is geworden, ben namelijk een stofafzuiging aan het bouwen, maar in eerste instantie had ik een stofzuiger in mn frees kast erbij gezet (om niet zoveel lawaai te hebben), maar toen is de temperatuur wel naar zon 40 a 50 graden gegaan op een onbewaakt moment.

Overigens ben ik nog steeds wel benieuwd wat dan de correcte stroom instelling is voor mijn steppers?

[robertH]

hmmm heb toch weer hetzelfde probleem...
Met extra hard aangedraaide verlijmde koppelingen..

Ik verlies dus op de een of andere manier stappen. Iemand nog ideeen?

[robertH]

Motor weer losgehaald en nu voel je ook bij deze motor de stapjes veel minder (voelt bijna als een DC motor), is de rotor dan gedemagnetiseerd ofzo? De motor is deze keer absoluut niet warm geweest, zelfs niet een beetje.