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Welcome, Girolamo!

I suspect the play in your DEC shaft, and its inconsistency, is caused by
two things:

1) A small amount of play between the worm and the worm wheel (gear); and

2) A small amount of play between the DEC shaft and the shaft bearings.

#2 permits the shaft to be slightly off-center with regards to the axis.
Therefore, #1 can come and go as the worm wheel pushes more or less against
the worm itself.

This is speculation, but there's been a lot of discussion recently on the
list regarding #2.

An alternative possibility, and one that I read about on the
Astrophotography Mail List (APML) about three years ago, is that the hold
in the center of the worm wheel itself is slightly larger than the shaft,
and therefore the worm wheel can be "locked" (via the clutch knob) in a
slightly eccentric position relative to the shaft.

I hope this helps.

Paul Sterngold

--- Girolamo Gallo <ggallo@...> wrote:

I am an Italian amateur astronomer. I have a problem with my brand new
G11.
Since the day one, I noticed a play in the declination axis. It becomes
very evident when the saddle plate is rotated at a particular angle with
respect to the mount. In this condition, if I grab the saddle plate I
clearly feel the play (about 1/3 of degree) that starts decreasing as
soon as the saddle plate is manually rotated by about 60 degrees. It
disappears once the DEC axis is rotated by 120 degrees and starts
increasing again at about 300 degrees.
Some Losmandy users suggested that the play is related to the mechanical
fixation of the declination axis to the saddle plate assembly. They also
said that their mounts have a set screw that locks the saddle assembly to
the declination axis, but I could not find that screw in my mount. Maybe
Losmandy changed the G11 shaft DEC assembly (can anybody confirm that?).
I would really appreciate if someone you could help me to solve this
problem.
Thanks in advance.

Clear skies!

Girolamo Gallo
Avezzano, Italy

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