I cannot get Onstep to track properly and have encountered speeds
more than twice expected tracking speeds. I wonder if you can
suggest appropriate calculator and Config.h generator entries for my
Dobsonian setup which I am sure I have miscalculated.
I have created an extra circular disc base for the right ascension
drive to the entire circumference of which is glued a 6 mm belt (SEE
PHOTO). This is connected to the drive of an ungeared 2 amp stepper
motor with 1.8 degree steps and, I assume, a total of 200 steps.
Each stepper motor is driven by an LV8729 driver (with 220 resistors
for which I have set vRef of about 1.1 V, the max the potentiometer
will generate). The motor makes contact with the belt via a
cogwheel with 16 teeth. There are 761 teeth on the belt. A similar
setup drives the Dec side of things although only a segment of a
similar radius wheel is employed. (See photos). The basic mechanics
work very well in that the drives work without slipping and they
hold firm when engaged. Although I have not experimented on it as
much, I don't believe GOTO is very accurate either.
I think I getting confused over steps per wormrot (among other
things): I don't have a worm, only a belt glued to the outside of a
disc. Also, what does one put down for GR1 and GR2? There is no
reduction gear on the motors and I wonder if a 761 tooth glued on
belt driven by a 16 tooth pulley can be called a reduction gear.
On 03/04/2022 15:02, Gerry Byrne via
Solar tracking was selected and daylight saving
was automatically rejected by Onstep. I did a timed one hour
test this morning which suggests that the scope is tracking
about 2.3 times faster than it should. I think I may have a
problem with the parameters entered in config.h.
select solar tracking?
What about daylight savings time?