![]() With a 3:1 pully and gears from the motor to the worm drive. For a 360 teeth gear, it means 1/360 of a complete revolution = 1 degree One complete turn of the worm drive moves the gear by 1 tooth. For 1 complete revolution of the worm drive, the worm gear will turn through 360 degrees? InfreqĪm I right in thinking that, if a worm gear and worm drive is 360:1. Where n=180.360 (degrees.) Max Azimuth + or - for AltAzm mode only. Where n=150.180 (degrees.) Max HA hour angle + or - for Eq modes. Polling for driver status info/fault detection. #define AXIS1_DRIVER_STATUS OFF // OFF, TMC_SPI, HIGH, or LOW. #define AXIS1_DRIVER_REVERSE OFF // OFF, ON Reverses movement direction, or reverse wiring instead to correct. #define AXIS1_DRIVER_IGOTO OFF // OFF, n, (mA.) Current during slews. #define AXIS1_DRIVER_IRUN OFF // OFF, n, (mA.) Current during tracking, appropriate for stepper/driver/etc. #define AXIS1_DRIVER_IHOLD OFF // OFF, n, (mA.) Current during standstill. #define AXIS1_DRIVER_MICROSTEPS_GOTO 8 // OFF, n. #define AXIS1_DRIVER_MICROSTEPS 32 // OFF, n. #define AXIS1_DRIVER_MODEL LV8729 // OFF, (See above.) Stepper driver model. n = (AXIS1_STEPS_PER_DEGREE*360)/reduction_final_stage Number of steps per worm rotation (PEC Eq mode only:) <-Req'd n = (stepper_steps * micro_steps * overall_gear_reduction)/360.0 Slew rates can be adjusted in the Onstep app either reduced or increased, best to start conservatively. That feeds the worm that drives a 180 tooth worm gear. teh gearbox is 5 to one and the pulleys add 1.5 so a 11.5 gear ratio. I use a 1.8 degree stepper attached to a high precision gearbox to drive my CGE mount. Apparently these mounts need 100 to 200 Ncm ( 8.85-17.70 Lb/in ) to work. But I need to make sure the stepper motors I choose have the right amount of torque. I intend to use the On step hardware and software. I want a excellent mount for following the planets at high magnification. But maybe in the future I will upgrade to a 6" F15. It will be for using my Skylight 4" F15 for visual. The Onstep site has a vast amount of info on stepper selection and has an online calculator to work out the sort of results you can expect from a certain combination of steppers/ pulleys/gears. Or if this is for visual or astrophotography which means far better tracking ability. Not sure what to recommend as I am nt sure of the size and weight of your mount or the payload it will be carrying. Some have a gearbox attached to give reduction and higher torque, if using one of those go for the high quality low backlash types. They come with different toque values and voltage requirements. They come in 1.8 degree per step or 0.9 degree per step which has double the resolution. Stepper motors come in sizes NEMA is the value. I guess I need to find a stepper motor that puts out about 1 Nm of torque and 0.9 degrees. I understand for this mount the gearing from the stepper motor to drive the worm is by belt and is usually either 2:1 or 3:1. The Beacon Hill worm gears are 6 1/2 " and 360:1 I believe. ![]() And how many degrees per stop the motor rotates? And then do all the maths? So really I need to look at how many steps the motor is capable of a second, when at full speed. ![]() The sprocket-and-ring gearing of the dome has a 12.6:1 gear ratio, so the dome turns 1 revolution in 67 seconds (= 12.6 * 5.37) That is then geared down by a factor of 26.85, giving my drive sprocket a speed of 1 revolution every 5.37 seconds ( = 26.85 / 5). The motor turns 0.9 degrees per step, so that gives 1800 degrees per second (= 2000 * 0.9), or 5 revolutions per second ( = 1800 / 360). ![]() The number of steps per second (controlled by the software) multiplied by the number of degrees per step (designed into the motor) gives you the number of degrees per second.įor my dome rotation, for example, I run the motor at 2000 steps per second when it is up to full speed. The speed of a stepper motor is determined by software. ![]()
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