Zobrazení zdroje stránky OnStep - poznámky


Moje konfigurace 

Převodovka je planetová převodovka se třemi družicemi, zejména počet zubů pro solární zařízení (z1) je 17, zatímco počet teeh na "koroně" (z3) je 46; proto je poměr mezi vstupním a výstupním hřídelem 3,7: 1 (z1 + z3) / z1  3,7058823529411764705882352941176

Verze  s řemenicí 

<pre>
#define MaxRate                   32 // this is the minimum number of micro-seconds between micro-steps
                                     // minimum* (fastest goto) is around 16 (Teensy3.2) or 32 (Mega2560), default=96 higher is ok
                                     // too low and OnStep communicates slowly and/or freezes as the motor timers use up all the MCU time
                                     // * = minimum can be lower, when both AXIS1/AXIS2_MODE_GOTO are used by AXIS1/AXIS2_STEP_GOTO times
                                     
#define DegreesForAcceleration   5.0 // approximate number of degrees for full acceleration or deceleration: higher values=longer acceleration/deceleration
                                     // Default=5.0, too low (about <1) can cause gotos to never end if micro-step mode switching is enabled.
#define DegreesForRapidStop      1.0 // approximate number of degrees required to stop when requested or if limit is exceeded during a slew: higher values=longer deceleration
                                     // Default=1.0, too low (about <1) can cause gotos to never end if micro-step mode switching is enabled.

#define BacklashTakeupRate        25 // backlash takeup rate (in multipules of the sidereal rate): too fast and your motors will stall,
                                     // too slow and the mount will be sluggish while it moves through the backlash
                                     // for the most part this doesn't need to be changed, but adjust when needed.  Default=25

                                     // Axis1 is for RA/Az
#define StepsPerDegreeAxis1   10910.11765 // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET   :  200 * 16 * (1+46/17)*60/25 * 138/360 = 10910.11765

                                     // Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2   6957.17647 // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET   :  200 * 16 * (1+46/17)*60/25 * 88/360 = 6957.17647
                                     
                                     // PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2.  Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 28461L

#define PECBufferSize           626  // PEC, buffer size, max should be no more than 3384, your required buffer size >= StepsPerAxis1WormRotation/(StepsPerDegeeAxis1/240)
                                     // for the most part this doesn't need to be changed, but adjust when needed.  824 seconds is the default.  Ignored on Alt/Azm mounts.

#define REVERSE_AXIS1_ON           // reverse the direction of movement for the HA/RA axis, adjust as needed or reverse your wiring so things move in the right direction
#define REVERSE_AXIS2_ON           // reverse the direction of movement for the Dec axis (both reversed for my EM10b, both normal for G11)

</pre>



Pro převodovku s poměrem 3.71 : 1  plus kola 54 zubů / 16 zubů
<pre>
                                     // Axis1 is for RA/Az
#define StepsPerDegreeAxis1  15359.4 // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET   :  200           * 16          * 3.71*54/16          *  138/360         = 15359.4
                                     // Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2   9794.4 // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET  :   200           * 16         * 3.71*54/16            *  88/360         = 9794.4
                                     
                                     // PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2.  Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 40068L
                                     //  NEMA17 + PLANET         : (15359*360)/138 = 40068L
</pre>


Pro převodovku 5+2/11 :1 RA  kola 55 zubů / 16 zubů a DE  kola 54 zubů / 16 zubů
 
<pre>
                                     // Axis1 is for RA/Az
#define StepsPerDegreeAxis1   21850.0   // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)                                 
                                     // My NEMA 17          :  200           * 16         * (5+2/11) * 55/16           *  138/360            = 21850.0

                                     // Axis2 is for Dec/Alt                                     
#define StepsPerDegreeAxis2   13680.0   // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // My NEMA 17          :  200           * 16         * (5+2/11) * 54/16           *  88/360             = 13680.0                                   
                                     
                                     // PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2.  Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 57000L
                                     // My  16m step          : (21850*360)/138= 57000
</pre>


Přímé spojení kola 54 zubů / 16 zubů
<pre>
                                     // Axis1 is for RA/Az
#define StepsPerDegreeAxis1   4140.00000  // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)                                 
                                     // My NEMA 17          :  200           * 16          * 54/16            *  138/360            = 4140.00000
                                     // Axis2 is for Dec/Alt
                                     
#define StepsPerDegreeAxis2   2640.00000// calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // My NEMA 17          :  200           * 16          * 54/16           *  88/360              = 2640.00000
                                     
                                     
                                     // PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2.  Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 10800L
                                     // My  16m step          : (4140*360)/138= 10800
</pre>


Upřesněné převody šneku  138:1 a 88 : 1 Kola 49 zubů / 16 zubů

<PRE>
#define StepsPerDegreeAxis1   3756.66667  // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)                                 
                                     // My NEMA 17          :  200           * 16          * 49/16            *  138/360            = 3756,66667
                                     // Axis2 is for Dec/Alt
                                     
#define StepsPerDegreeAxis2   2395.55556  // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // My NEMA 17          :  200           * 16          * 49/16           *  88/360              = 2395,55556
                                     
                                     // the EM10b has two spur gears that drive the RA/Dec worms, they give an additional 1.25:1 reduction
                                     // in addition to the 18:1 gear heads on the steppers for a 22.5:1 final ratio before the worm/wheels at 144:1
                                     
                                     // PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2.  Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 9800L
                                     // My  16m step          : (3757*360)/138= 9800
                                     
</PRE>


Původní odhadované převody šneků RA 144  DE 72

<PRE>
#define StepsPerDegreeAxis1  3920.0  // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)                                 
                                     // My NEMA 17          :  200           * 16          * 49/16            *  144/360              = 3920
                               
                                     
#define StepsPerDegreeAxis2  1960.0   // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // My NEMA 17          :  200           * 16          * 49/16           *  72/360              = 1960


#define StepsPerWormRotationAxis1 9800
                                     // My  16m step          : (3920*360)/144 = 9800
</PRE>


Small 3D 1024 : 1 
<PRE>
                                     // Axis1 is for RA/Az
#define StepsPerDegreeAxis1  9102.22222  // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET   :  200           * 16          * 4          *  256/360         = 9102.22222

                                     // Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2  9102.22222  // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET  :   200           * 16         * 4            *  256/360         = 9102.22222
                                     
                                     // PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2.  Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 12800L
                                     //  NEMA17 + PLANET         : (9102.22222*360)/256 = 12800



</PRE>



<PRE>
                                     // Axis1 is for RA/Az
#define StepsPerDegreeAxis1  18204.44444   // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET   :  400           * 16          * 1          *  1024/360       = 18204.44444

                                     // Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2  18204.44444   // calculated as    :  stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
                                     // NEMA17 + PLANET  :   400           * 16         * 1            * 1024/360        = 18204.44444
                                     
                                     // PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2.  Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 6400L
                                     //  NEMA17 + PLANET         : (18204,44444*360)/1024 = 6400

</PRE>