eqmod Attention, EQMOD/EQASCOM users, huge DEC backlash fast correction!
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By benzomobile
Hi to all.
The most popular mounts - even those that are included in the small-medium range group, do drive the axes rotation via worm wheel coupling .
This one are plagued by the drawback that I have always considered very unpleasant: the mechanical play is not properly controlled and it can’t be always limited within acceptable tolerance limits.
The adjustment of Back Lash (BL) is entrusted to two screws (more often they are grains) usually positioned at 180 ° from each other. However - as we all know, even a wheel very slight eccentric creates
an inconstancy of contact with the worm: when the play is adjusted for an initial position of the axis, it is not in other positions.
In other words, there are positions where the worm rotates with adequate friction, others in which the same friction can increase significantly, and still others where it is so reduced to the point
that it causes excessive play.
So, the tuning screws are sometimes too tight and sometimes too loose … mission impossible to find the right compromise!
This behavior is already annoying in manual movement because the task of pointing at an object in a steady way is not feasible because it ever 'jumps'.
In photography it's even worse.
Not only does an unavoidable backlash often appears in Dec – and it is very badly correctable also by the autoguider software, but- and it is dirty worse, the tracking in RA does not perform evenly
and smoothly. The typical ‘micro’ irregularities in star images is what we see in our shots.
Many high range mounts adopt different methods to contain lashes, and the best ones adopt mechanical systems with which that error is reduced to zero.
With this long introduction, I will tell you what very simple modification I thought of making on my HEQ5.
Please, stay tuned 🙂
Beppe
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By chrobakx
Recently I acquired the eq3 mount and now I'm looking for Skywatcher Dual Axis or enhanced dual axis Motor Drive for this Mount .
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By SStanford
Hi All,
With ongoing issues related to slewing in the EQ3 pro it's quite clear that there is some significant backlash.
I understand there is a way to repair this myself; does anyone have details of guide for the EQ3 pro to reduce the backlash?
I also understand that the lubricant is important to reduce backlash. Can anyone make any recommendations here too?
Thanks again!
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