Acceleration Problems

Greetings

I seem to be having an acceleration problem
with much tinkering i came across the idea to just drop all the sittings low and see if this help, and to my surprise they did
What happens is that my X axis just stops working, i get a high pitched whining noise from the motor and nothing till the next movement and so the cycle repeats, i dropped my max acceleration down to 1

what are the implications of having the settings so low?

below are my settings

//// MOVEMENT SETTINGS
#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
#define HOMING_FEEDRATE {400, 400, 400, 0} // set the homing speeds (mm/min)

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT {266.666,266.666,320,760*1.1}
#define DEFAULT_MAX_FEEDRATE {400, 400, 5, 45} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {1, 1, 100, 10000} // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.

#define DEFAULT_ACCELERATION 400 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 400 // X, Y, Z and E max acceleration in mm/s^2 for r retracts

//
#define DEFAULT_XYJERK 10.0 // (mm/sec)
#define DEFAULT_ZJERK 0.4 // (mm/sec)
#define DEFAULT_EJERK 5.0 // (mm/sec)


Thanks in advance

Quote

what are the implications of having the settings so low?

Your print head accelerates faster. Ideally, this is the only implcation. All other implications can be considered as bugs and/or firmware algorithms shortcomings.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Hi your values for speed and accelaration are much to high


try this, then increase untill you run into problems

//// MOVEMENT SETTINGS
#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
#define HOMING_FEEDRATE {40, 40, 40, 0} // set the homing speeds (mm/min)

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT {266.666,266.666,320,760*1.1}
#define DEFAULT_MAX_FEEDRATE {40, 40, 5, 45} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {40, 40, 100, 10000} // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.

#define DEFAULT_ACCELERATION 40 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 40 // X, Y, Z and E max acceleration in mm/s^2 for r retracts


please realize you're asking in the old settings to move equipment around at a speed of 40 cm per SECOND
the motors cannot deal with the required current

also check the steps per unit- they seem high I run mine is 80, with t5, 8 teeth pully, finest stepping
there is a calculator from prusa somewhere- check the wiki

hope this helps


carel

Thanks for the reply carel

I am actually using a repstrap, i have threaded rod driving my axes until i can print my brackets
I will have a look for the calculator