Slewing always comes up short of target using stellarium


Ignacio Banuelos
 

When slewing to stars, Onstep always comes up short even if polar alignment is good..Both axis comes up short but RA more so.. depending on star position
Tracking is very good. Using TMC 2209_VQUIET.. motors do not slip and are very silent with excellent torque. using 12V at aprox 60% max amp for each motor.

Using Stellarium for slewing with ASCOM Driver via Home Wifi and using sync when aligning various stars but never gets stars on target.. I am guessing because of slewing not getting to destination.

Any Ideas why this could be happening?
Thanks

---- Config.h settings:----
RA: 189 tooth Byers gear and worm and 20T Stepper pulley with 65T at worm, 400 step motor Nema 32
DEC 180 toot gear with 16T Stepper pulley and 60T at worm, 400 step motor Nema 17

// AXIS1 RA/AZM
// see https://onstep.groups.io/g/main/wiki/6-Configuration#AXIS1
#define AXIS1_STEPS_PER_DEGREE    43680.0 //  12800, n. Number of steps per degree:  26880                                        <-Req'd
                                          //         n = (stepper_steps * micro_steps * overall_gear_reduction)/360.0
#define AXIS1_STEPS_PER_WORMROT   83200 //  12800, n. Number of steps per worm rotation (PEC Eq mode only:)                <-Req'd
                                          //         n = (AXIS1_STEPS_PER_DEGREE*360)/reduction_final_stage

#define AXIS1_DRIVER_MODEL            TMC2209_VQUIET //    OFF, (See above.) Stepper driver model.                                      <-Often
#define AXIS1_DRIVER_MICROSTEPS       64 //    OFF, n. Microstep mode when tracking.    32                                    <-Often
#define AXIS1_DRIVER_MICROSTEPS_GOTO  OFF // OFF, n. Microstep mode used during gotos.   16                                 Option
#define AXIS1_DRIVER_IHOLD            OFF //    OFF, n, (mA.) Current during standstill. OFF uses IRUN/2.0                    Option
#define AXIS1_DRIVER_IRUN             OFF //    OFF, n, (mA.) Current during tracking, appropriate for stepper/driver/etc.    Option
#define AXIS1_DRIVER_IGOTO            OFF //    OFF, n, (mA.) Current during slews. OFF uses same as IRUN.                    Option
#define AXIS1_DRIVER_REVERSE          OFF //    OFF, ON Reverses movement direction, or reverse wiring instead to correct.   <-Often
#define AXIS1_DRIVER_STATUS           OFF //    OFF, TMC_SPI, HIGH, or LOW.  Polling for driver status info/fault detection.  Option

#define AXIS1_LIMIT_UNDER_POLE        180 //    180, n. Where n=150..180 (degrees.) Max HA hour angle + or - for Eq modes.    Infreq
#define AXIS1_LIMIT_MAXAZM            360 //    360, n. Where n=180..360 (degrees.) Max Azimuth + or - for AltAzm mode only.  Infreq

// AXIS2 DEC/ALT
// see https://onstep.groups.io/g/main/wiki/6-Configuration#AXIS2
#define AXIS2_STEPS_PER_DEGREE    48000 //  12800, n. Number of steps per degree:                                          <-Req'd
                                        //         n = (stepper_steps * micro_steps * overall_gear_reduction)/360.0

#define AXIS2_DRIVER_MODEL            TMC2209_VQUIET //    OFF, (See above.) Stepper driver model.                                      <-Often
#define AXIS2_DRIVER_MICROSTEPS       64 //    OFF, n. Microstep mode when tracking.                                        <-Often
#define AXIS2_DRIVER_MICROSTEPS_GOTO  OFF //    OFF, n. Microstep mode used during gotos.                                     Option

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