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I just received a new Titan axis upgrade for the Losmandy G11. It is a beautiful piece of kit. After balancing the axes and selecting the G11T in the hand controller, I moved the mount on both axes to make sure everything was working smoothly. In the new RA axis, I'd hear a ticking sound. The mount has some weight on it (about 45 lbs) but everything is well balanced. When I removed the RA motor and ran it from the hand controller, there was no ticking sound. Adjusting the tightness of the motor against he gear housing did produce much of a change, though I thought I noticed a much smaller tick slewing eastward versus slewing towards the west. The ticking is at very regular intervals at maximum slew using the hand controller (perhaps every 0.5 sec). It does not seem to affect slewing at all and there is no binding to the point that movement stops in any orientation I've checked.?

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When the RA motor was attached to the G11G, it did not make this sound. The Axis upgrade calls for using the RA axis motor from the G11G for the G11T. Settings in the hand controller are those necessary for the G11T in terms of gearing.?

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My first thought was a possible gearbox issue, though this seems a little less likely coming straight from the factory. Another thought, coming from my G11G days of two days ago, was perhaps the RA worm gear needs some adjusting? There is probably a good 30 degrees F in temperature difference between my location and where the worm gear was originally adjusted; however, I've read that these are properly adjusted at the factory. I'm not a natural tinkerer. I was recently befuddled by a focuser screw. So while I adjusted the worm gear on my G11G, I was absolutely certain I needed to. Now, I'm not so sure and would rather get some further information before taking things apart and coming to the usually problematic realization that there are extra parts.?

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First, is this clicking sound actually normal for a new mount??

If this sound isn't entirely normal but everything is working as it should, should I just use the mount under the rules of engagement regarding things that aren't broken?

If tinkering is required, what are the areas I should look to tinker in? Gearbox and...??

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Thanks in advance for all replies!?

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Regards,?

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George

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I have a G11G and the DEC was making a clicking sound when slewing under load.? I used one of these to isolate the sound.? The SLW needed adjusting.

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Jim W
Phoenix, AZ. USA

Losmandy G11G w/ L6, NINA 3.0 / ASTAP, ASI2600MC Pro, Sky-Watcher Scopes, Canon L Lenses.

Hi George,

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A ticking while slewing does not necessarily mean a problem with tracking and guiding. Since you are in slew speed, it's hard to say where a 0.5s noise might be coming from. You may want to take off the spur gear covers and see if you can spot anything. I'd say take all the payload off and try to turn the gears by hand to see if you can feel or spot any hangups. Then try removing the motor and turn things again if the prior test doesn't reveal anything. I wonder how your old pinion gear mates with the new gearbox. This situation might require a call to HGM.

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Good luck,

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John

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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, NINA, Sequence Generator Pro and PixInsight user

Thanks, John. I removed the RA axis cover and did not see anything amiss when slewing. It looked pretty perfect. I fiddled with the SLW. The sound is much fainter now. I don't think it is now imaginary, but the volume is low enough that I'll probably have to ask my wife if she can hear it just to be certain it is still there. I could now be hearing it because I expect to hear it.?

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I also wondered how the old gear aligned with the gearbox. The old motor has only had about 200-250 hours of tracking use (to include slews). I didn't feel the vibration of the ticks in the gearbox, only in the motor, which made me think it was a motor problem at first. With a clearer head, I will check back tonight for both the sound and feel for any rhythmic vibrations.?

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The last thing I feel like doing is removing that motor again. I quite literally bled getting it back on, which included language that earned the outing a solid R rating. It seems like they could design a motor housing that does not impede access.?

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George