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Mount slow to respond to PHD2

 

Hello group, I'm hoping that someone can decipher these guide logs better than I.
The basic problem is that the mount is slow to respond to guide commands from PHD2, at times.
The DEC axis is the most affected by this, though the RA axis also shows signs.?
?
I have tried a few things:?
? ? Tightened the screws holding the motor assembly to the mount, both axes. (no discernible affect,
? ? though the spur gears are hard to move on both axes. Not as Scott describes in his videos, IMO.)
? ? Changed PHD2 exposure settings from 0.2 seconds through 3 seconds. (0.2 second most effective
? ? especially on the RA axis. The main advantage is the excursions are compressed in time)
? ? Changed RA algorithm from Predictive PEC to Resist Switch. (no discernible affect)
? ? Reworked the cabling several times. (no discernible affect)
? ? Used ST4 port to try and eliminate the software contributions. (Much worse on both axis)
? ? Disconnected all applications connected to the mount but PHD2. (no discernible affect)
? ? Set different tensions on the clutches. (no discernible affect)
?
Equipment/software list
Losmandy G-11 just reworked to include the tucked motor & spring loaded worm, the problem appears after this?
modification.?
ZWO ASI120mm guide camera.
Gemini 2, level 6. plus the Gemini.net driver, ethernet connection to mount.
PHD2 2.6.13
Cartes Du Ceil
N.I.N.A.
Windows 10 x64
?
Guide logs, debug logs are too big to send.
Please note the times below. Ignore the other time stamps labeled guiding in each log.
07/19/24
22:52:59 ? ? Target gamma cygni region, about 70 degrees above the horizon.
? ? During this log I increased the mount settle after dither time from 10 seconds to 30 seconds.
23:36:36 ? ? Target gamma cygni region, about 70 degrees above the horizon.
? ? I began fiddling with the PHD2 settings towards the end of this part of the log.
01:05:48 ? ?Guiding assistant run showing very good polar alignment.
07/18/24
23:52:56 ? ? Target gamma cygni region, about 70 degrees above the horizon.
? ? ignore 0:16:45 thru 0:18:51 that was me touching the wires.
0:44:19 ? ? Target gamma cygni region, about 70 degrees above the horizon.
?
Any thoughts are appreciated. Has this been seen before??
Thanks Tim.

PHD2_GuideLog_2024-07-19_221435.txt
PHD2_GuideLog_2024-07-19_221435.txt
PHD2_GuideLog_2024-07-18_223005.txt
PHD2_GuideLog_2024-07-18_223005.txt

 

On Sat, Jul 20, 2024 at 11:24 AM, <tshelley@...> wrote:
Losmandy G-11 just reworked to include the tucked motor & spring loaded worm, the problem appears after this?
modification.?
Tim,
?
It sounds like you are binding up from too much worm tension after the rebuild. With the spur gear covers off, you should still be able to turn the gears freely by hand (with power off). If you remove the motors, the gears should have just a slight bit of tension. The videos can probably show you how to adjust them as well as can be described here (I have the older non-spring-loaded type). The worm and ring should be lubed with the Losmandy original grease, the Jet-Lube MP-50, or you may have too much friction slowing movement. You should talk to whomever did you rebuild for more advice.
?
Good luck,
?
John
--
_____________________________________________________________________________________________________________________________________________________________________________

Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, Sequence Generator Pro and PixInsight user
 

Thanks very much for your quick response.
?
I tried the spur gears with the clutch engaged. I would guess the clutches should be loosened. Am I correct.
Thanks again, Tim
 

On Mon, Jul 22, 2024 at 04:18 PM, <tshelley@...> wrote:
I tried the spur gears with the clutch engaged. I would guess the clutches should be loosened. Am I correct.
Tim,
?
You clutches should be tight, just like they would be if the mount had a payload on top. Then you should be making tension adjustments.
?
John
--
_____________________________________________________________________________________________________________________________________________________________________________

Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, Sequence Generator Pro and PixInsight user
 

Thanks John for the good news.
 

I owe the group a reply on my issue. Basically, the problem was play
between the worm and worm bearings. The remedy was to remove the worm
cover and follow the process laid out in the most recent losmandy
video (~ 4 yrs. ago). The "trap" was when inspecting the mount as
received, the spur gears did rotate freely and described in the
Losmandy video. There was just no corresponding movement in the axis.
I adjusted the system (worm play, spring tension, etc.) so there was
easy (as opposed to free) movement in the spur gears. I have gotten
good results in guiding since the adjustment. Note: There was a
gradual transition between easy and difficult movement. So there may
be more to be gained from further tuning.
Thanks for your help, Tim.

On Tue, Jul 23, 2024 at 10:22?AM tshelley via groups.io
<tshelley@...> wrote:

Thanks John for the good news.
 
Edited

On Mon, Aug 5, 2024 at 09:03 AM, TimS wrote:
I owe the group a reply on my issue. Basically, the problem was play
between the worm and worm bearings. The remedy was to remove the worm
cover and follow the process laid out in the most recent losmandy
video (~ 4 yrs. ago). The "trap" was when inspecting the mount as
received, the spur gears did rotate freely and described in the
Losmandy video. There was just no corresponding movement in the axis.
I adjusted the system (worm play, spring tension, etc.) so there was
easy (as opposed to free) movement in the spur gears. I have gotten
good results in guiding since the adjustment. Note: There was a
gradual transition between easy and difficult movement. So there may
be more to be gained from further tuning.
Thanks for your help, Tim.

On Tue, Jul 23, 2024 at 10:22?AM tshelley via groups.io
<tshelley@...> wrote:

Thanks John for the good news.
?
Yup. This is a common issue as is the loose set screws on the Oldham coupler. If this is a spring loaded OPW but there is still lots of movement on the axis there is excessive clearance between the bearings and worm body.
?
Thanks for sharing, mostly when things get fixed posters just stop posting and nobody knows what really resolved the issue. This helps everyone to close the loop.?
?
?
--

Chip Louie Chief Daydreamer Imagination Hardware?

Astrospheric Forecast - South Pasadena, CA?

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