Date   

Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

Wes Mcdonald
 

Parag

Nice image!

My guess is APT stopped at meridian.  Look into that.

Wes


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

Parag Modi
 

My first DSO with iEXOS-100 and just a DSLR unguided.  Stack of 55 images 60 sec at 500 ISO and f/8.  Very happy with this little mount! 

Thank you for this forum members for providing guidance to a total newbie like me.

Another Newbie question though.  I was planning on 75 frames using APT and mount connected to POTH hub and using APT dithering.  However after 55 images when M42 got to meridian, rest of the images did not track M42 but were to the left of the meridian.  Any advice?

Thank you,

--
Parag Modi

Mounts: ES iEXOS-100
Scopes: APS-C Sigma 18-300 mm
Cameras:  Nikon D7200 (Unmodified)
Misc: Bahtinov Mask, K&F Concept Clear night filter
Software: ExploreStars, Stellarium, APT


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Wes Mcdonald
 

Rix:

I don't think you are correct.  Can't wait to see the outcome.
Wes.


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Rix Yarbrough <yarbroughrix@...>
 

No guiding. This is only plugged into AC power and controlled with explorestars. This chugging definitely is not adequate for sidereal tracking and from what I have seen in every other example of this mount running, it is abnormal. I agree that it seems like an issue with onboard communication and not motor hardware- it's receiving the wrong signals or at least at the wrong times. Talking more with ES customer support about it.

Virus-free. www.avast.com

On Mon, Jan 11, 2021 at 6:48 AM Wes Mcdonald <wesmcd6@...> wrote:
Rix

To what Dino said:

On the iexos you can’t swap the drive cables but you can, if you want to, swap the motors.   But without thinking much more about it I feel the motor is fine.  I don’t think you could see the pulley chug along at sidereal rate.

I will fool with my iexos today and see if it looks like it jerks along 

But not round stars are usually ultimately caused by a combination of issues not the mount motors.  Btw what focal length was your scope?  Remind me we’re you guiding?  If so what was the rms error reported by PhD.

Wes

On Sun, Jan 10, 2021 at 10:47 PM Rix Yarbrough <yarbroughrix@...> wrote:
If I press [Tr], changing to <P>, the chugging continues but is now more irregular and less rhythmic. What should I be looking/listening for? I can see the motor moving normally, but only every chug, there is no constant motion. There is constant motion and it sounds ordinary while slewing, but while tracking the issue persists no matter what.

On Sun, Jan 10, 2021 at 10:20 PM Wes Mcdonald <wesmcd6@...> wrote:
Rix 

I mean press the T button in explorestars which puts the mount into point mode not park.  

The sound is caused by a resonance that seems to happen with the motor assembly and the pulses driving the stepper motor.  At least that has always been my theory.  See if they
Change in P mode.  

Wes


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Virus-free. www.avast.com


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Wes Mcdonald
 

Rix

To what Dino said:

On the iexos you can’t swap the drive cables but you can, if you want to, swap the motors.   But without thinking much more about it I feel the motor is fine.  I don’t think you could see the pulley chug along at sidereal rate.

I will fool with my iexos today and see if it looks like it jerks along 

But not round stars are usually ultimately caused by a combination of issues not the mount motors.  Btw what focal length was your scope?  Remind me we’re you guiding?  If so what was the rms error reported by PhD.

Wes

On Sun, Jan 10, 2021 at 10:47 PM Rix Yarbrough <yarbroughrix@...> wrote:
If I press [Tr], changing to <P>, the chugging continues but is now more irregular and less rhythmic. What should I be looking/listening for? I can see the motor moving normally, but only every chug, there is no constant motion. There is constant motion and it sounds ordinary while slewing, but while tracking the issue persists no matter what.

On Sun, Jan 10, 2021 at 10:20 PM Wes Mcdonald <wesmcd6@...> wrote:
Rix 

I mean press the T button in explorestars which puts the mount into point mode not park.  

The sound is caused by a resonance that seems to happen with the motor assembly and the pulses driving the stepper motor.  At least that has always been my theory.  See if they
Change in P mode.  

Wes


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Rix Yarbrough <yarbroughrix@...>
 

If I press [Tr], changing to <P>, the chugging continues but is now more irregular and less rhythmic. What should I be looking/listening for? I can see the motor moving normally, but only every chug, there is no constant motion. There is constant motion and it sounds ordinary while slewing, but while tracking the issue persists no matter what.


On Sun, Jan 10, 2021 at 10:20 PM Wes Mcdonald <wesmcd6@...> wrote:
Rix 

I mean press the T button in explorestars which puts the mount into point mode not park.  

The sound is caused by a resonance that seems to happen with the motor assembly and the pulses driving the stepper motor.  At least that has always been my theory.  See if they
Change in P mode.  

Wes


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Dino Monaco
 

Rix.  I don’t think you can try this on the PMC8 system 
That is to swap the RA & Dec cables. Although I’m familiar w the EOS system, I’m not sure if this can be done.
I’m  still waiting for mine. Back ordered.

Anyway, My thought was that if if there is a way to exchange the cables to the drive motors and run them, you can determine once and for all if the noise is isolated to the RA motor or something along the com path.



On Jan 10, 2021, at 10:08 PM, Rix Yarbrough <yarbroughrix@...> wrote:


When putting it in park it definitely doesn’t sound right- don’t know how to explain it. Sound comes back when I unpark. Even if this sound isn’t abnormal I sure know it’s not normal to hear nothing but it. It’s the same when connected via ascom as well, so I don’t think it’s an issue with explorestars. 

On Sun, Jan 10, 2021 at 20:22 Wes Mcdonald <wesmcd6@...> wrote:
Dino.  

That sounds actually ok.  Put the explorestars into P mode and see how it changes sound.  That funny chugging sound is not unusual, at least I ha e heard it too.  But in truth seems like is is softer

Wes 

--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


--
Dino Monaco


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Wes Mcdonald
 

Rix 

I mean press the T button in explorestars which puts the mount into point mode not park.  

The sound is caused by a resonance that seems to happen with the motor assembly and the pulses driving the stepper motor.  At least that has always been my theory.  See if they
Change in P mode.  

Wes


--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Rix Yarbrough <yarbroughrix@...>
 

When putting it in park it definitely doesn’t sound right- don’t know how to explain it. Sound comes back when I unpark. Even if this sound isn’t abnormal I sure know it’s not normal to hear nothing but it. It’s the same when connected via ascom as well, so I don’t think it’s an issue with explorestars. 

On Sun, Jan 10, 2021 at 20:22 Wes Mcdonald <wesmcd6@...> wrote:
Dino.  

That sounds actually ok.  Put the explorestars into P mode and see how it changes sound.  That funny chugging sound is not unusual, at least I ha e heard it too.  But in truth seems like is is softer

Wes 

--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Wes Mcdonald
 

Dino.  

That sounds actually ok.  Put the explorestars into P mode and see how it changes sound.  That funny chugging sound is not unusual, at least I ha e heard it too.  But in truth seems like is is softer

Wes 

--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: #EXOS2 My RA on my mount is wiggling, Causing Star Trailing!!! #EXOS2

nickerson.joseph@...
 

After watching the video provided by jdavis I am pretty convinced that is my issue. I have check and rechecked everything you have mentioned. I am hoping to get in touch with Explorer Scientifics customer service before I open it up given that the mount is only 6 months and still under warranty. Thanks for your suggestions.


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Rix Yarbrough <yarbroughrix@...>
 

Yeah, AC cable. Also using the explorestars app set to iEXOS-100. Should be fine settings. I also heard the same noise when I tried ASCOM control, so I doubt it’s software- especially since slewing works fine and the dec motor sounds fine when it’s running. Might be time for a new motor. 

On Sun, Jan 10, 2021 at 17:06 Dino Monaco via groups.io <Dinomonaco=me.com@groups.io> wrote:
Ok. That’s interesting. So now we know it’s not the mechanicals.
Some more questions:
What type of power source? Direct AC or battery?
If your powering the system from an ac outlet then that rules out current fluctuations.
If software related then check in the settings for correct RA Steps for your mount. 
See if you could increase or decrease the step values and try running the motor without the belt attached. Does this alleviate the noise?
If no then I would swap out the motor.




On Jan 10, 2021, at 3:48 PM, Rix Yarbrough <yarbroughrix@...> wrote:


Dino-
Hm. Just took the belt off, powered on, connected. I hear the sound from the motor even though it now has literally zero payload to move. This is concerning. Unless this is a problem with firmware, and software, or the connection, this motor could be the issue. I did buy this mount used...
Anyone know what I should do next? Contact ES, ask for a new motor? Play around with firm/software?

Virus-free. www.avast.com

On Sun, Jan 10, 2021 at 3:40 PM Dino Monaco via groups.io <Dinomonaco=me.com@groups.io> wrote:
Sorry I just joined the group and late to what you have already tried.
A curious question: if you remove the belt completely so that you can isolate only the motor,  
Then activate the RA do you still hear the sound?
If yes then motor is perhaps the issue.
If no, then try like you said and realign the worm not too tightly. 
Is the sound happening under full payload with all gear attached only?.
How about without the payload.
My apologies if you have already tried these simple checks


On Jan 10, 2021, at 3:22 PM, Rix Yarbrough <yarbroughrix@...> wrote:


Just to update- still have not resolved my problem. I have adjusted backlash and balance to hell and back but no luck at all. Here is a video of the problem, which I hope will help someone identify it exactly. 
As you can (sort of) see; the RA motor is only able to chug the gear forward bit by bit, making an awful sound in the process. The payload is balanced in my opinion perfectly, but to be sure I have also tried moving the CW’s back and forth both tiny and large amounts, but in the very best circumstances the motion only becomes a slight bit more constant. Still it chugs and the noise continues. It is possible that I have messed something up in the gear adjustment process- I sometimes get side/side movement of the worm shaft which according to the tutorial aforementioned is solved by tightening a screw in the right block. However, my screw feels completely impossible to move, so my solution has been to loosen the blocks holding in both ends of the worm gear shaft, move them to one side, and tighten them again- which seems to fix the problem. I say seems because although the back/forth motion goes away, it *could* create some directional strain or make the gear meet the belt at a bad angle, but I have really no idea. The gear doesn't feel too tight to turn, so I sort of doubt it.
So what the actual hell is going on here? Open to crackpot theories, although I’m hoping the answer is simple and obvious to someone more knowledgeable than myself. 

Rix


On Tue, Dec 29, 2020 at 16:28 yarbroughrix via groups.io <yarbroughrix=gmail.com@groups.io> wrote:

Got a used iEXOS-100 and was finally able to diagnose my issue: it seems that the RA motor, in particular, is struggling to move the mount. When connected to the app and tracking, the motors can be heard "chugging" as if they are struggling. The explorestars app shows that when tracking, the RA axis just flips back and forth one arc second at a time rapidly (38, 39, 38, 39, etc), leading me to believe the motor is not putting out enough torque to turn the axis. When I attempt to slew at a high speed, and motor sounds like it is struggling, making a bad racket, but is able to rotate the axis. Seems like it's just facing more friction than it is expecting, perhaps? I've tried adjusting the backlash at three levels (tight, loose, medium) but it seems not to have an effect. Maybe I need to relubricate the RA gear teeth? Is WD-40 recommended, or something else? I'd like to not experiment much more until I know a fix, as I am worried about damaging the motor. Any advice is welcome.

 

Rix


--
Dino Monaco


Virus-free. www.avast.com

--
Dino Monaco


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Dino Monaco
 

Ok. That’s interesting. So now we know it’s not the mechanicals.
Some more questions:
What type of power source? Direct AC or battery?
If your powering the system from an ac outlet then that rules out current fluctuations.
If software related then check in the settings for correct RA Steps for your mount. 
See if you could increase or decrease the step values and try running the motor without the belt attached. Does this alleviate the noise?
If no then I would swap out the motor.




On Jan 10, 2021, at 3:48 PM, Rix Yarbrough <yarbroughrix@...> wrote:


Dino-
Hm. Just took the belt off, powered on, connected. I hear the sound from the motor even though it now has literally zero payload to move. This is concerning. Unless this is a problem with firmware, and software, or the connection, this motor could be the issue. I did buy this mount used...
Anyone know what I should do next? Contact ES, ask for a new motor? Play around with firm/software?

Virus-free. www.avast.com

On Sun, Jan 10, 2021 at 3:40 PM Dino Monaco via groups.io <Dinomonaco=me.com@groups.io> wrote:
Sorry I just joined the group and late to what you have already tried.
A curious question: if you remove the belt completely so that you can isolate only the motor,  
Then activate the RA do you still hear the sound?
If yes then motor is perhaps the issue.
If no, then try like you said and realign the worm not too tightly. 
Is the sound happening under full payload with all gear attached only?.
How about without the payload.
My apologies if you have already tried these simple checks


On Jan 10, 2021, at 3:22 PM, Rix Yarbrough <yarbroughrix@...> wrote:


Just to update- still have not resolved my problem. I have adjusted backlash and balance to hell and back but no luck at all. Here is a video of the problem, which I hope will help someone identify it exactly. 
As you can (sort of) see; the RA motor is only able to chug the gear forward bit by bit, making an awful sound in the process. The payload is balanced in my opinion perfectly, but to be sure I have also tried moving the CW’s back and forth both tiny and large amounts, but in the very best circumstances the motion only becomes a slight bit more constant. Still it chugs and the noise continues. It is possible that I have messed something up in the gear adjustment process- I sometimes get side/side movement of the worm shaft which according to the tutorial aforementioned is solved by tightening a screw in the right block. However, my screw feels completely impossible to move, so my solution has been to loosen the blocks holding in both ends of the worm gear shaft, move them to one side, and tighten them again- which seems to fix the problem. I say seems because although the back/forth motion goes away, it *could* create some directional strain or make the gear meet the belt at a bad angle, but I have really no idea. The gear doesn't feel too tight to turn, so I sort of doubt it.
So what the actual hell is going on here? Open to crackpot theories, although I’m hoping the answer is simple and obvious to someone more knowledgeable than myself. 

Rix


On Tue, Dec 29, 2020 at 16:28 yarbroughrix via groups.io <yarbroughrix=gmail.com@groups.io> wrote:

Got a used iEXOS-100 and was finally able to diagnose my issue: it seems that the RA motor, in particular, is struggling to move the mount. When connected to the app and tracking, the motors can be heard "chugging" as if they are struggling. The explorestars app shows that when tracking, the RA axis just flips back and forth one arc second at a time rapidly (38, 39, 38, 39, etc), leading me to believe the motor is not putting out enough torque to turn the axis. When I attempt to slew at a high speed, and motor sounds like it is struggling, making a bad racket, but is able to rotate the axis. Seems like it's just facing more friction than it is expecting, perhaps? I've tried adjusting the backlash at three levels (tight, loose, medium) but it seems not to have an effect. Maybe I need to relubricate the RA gear teeth? Is WD-40 recommended, or something else? I'd like to not experiment much more until I know a fix, as I am worried about damaging the motor. Any advice is welcome.

 

Rix


--
Dino Monaco


Virus-free. www.avast.com

--
Dino Monaco


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Rix Yarbrough <yarbroughrix@...>
 

Dino-
Hm. Just took the belt off, powered on, connected. I hear the sound from the motor even though it now has literally zero payload to move. This is concerning. Unless this is a problem with firmware, and software, or the connection, this motor could be the issue. I did buy this mount used...
Anyone know what I should do next? Contact ES, ask for a new motor? Play around with firm/software?

Virus-free. www.avast.com

On Sun, Jan 10, 2021 at 3:40 PM Dino Monaco via groups.io <Dinomonaco=me.com@groups.io> wrote:
Sorry I just joined the group and late to what you have already tried.
A curious question: if you remove the belt completely so that you can isolate only the motor,  
Then activate the RA do you still hear the sound?
If yes then motor is perhaps the issue.
If no, then try like you said and realign the worm not too tightly. 
Is the sound happening under full payload with all gear attached only?.
How about without the payload.
My apologies if you have already tried these simple checks


On Jan 10, 2021, at 3:22 PM, Rix Yarbrough <yarbroughrix@...> wrote:


Just to update- still have not resolved my problem. I have adjusted backlash and balance to hell and back but no luck at all. Here is a video of the problem, which I hope will help someone identify it exactly. 
As you can (sort of) see; the RA motor is only able to chug the gear forward bit by bit, making an awful sound in the process. The payload is balanced in my opinion perfectly, but to be sure I have also tried moving the CW’s back and forth both tiny and large amounts, but in the very best circumstances the motion only becomes a slight bit more constant. Still it chugs and the noise continues. It is possible that I have messed something up in the gear adjustment process- I sometimes get side/side movement of the worm shaft which according to the tutorial aforementioned is solved by tightening a screw in the right block. However, my screw feels completely impossible to move, so my solution has been to loosen the blocks holding in both ends of the worm gear shaft, move them to one side, and tighten them again- which seems to fix the problem. I say seems because although the back/forth motion goes away, it *could* create some directional strain or make the gear meet the belt at a bad angle, but I have really no idea. The gear doesn't feel too tight to turn, so I sort of doubt it.
So what the actual hell is going on here? Open to crackpot theories, although I’m hoping the answer is simple and obvious to someone more knowledgeable than myself. 

Rix


On Tue, Dec 29, 2020 at 16:28 yarbroughrix via groups.io <yarbroughrix=gmail.com@groups.io> wrote:

Got a used iEXOS-100 and was finally able to diagnose my issue: it seems that the RA motor, in particular, is struggling to move the mount. When connected to the app and tracking, the motors can be heard "chugging" as if they are struggling. The explorestars app shows that when tracking, the RA axis just flips back and forth one arc second at a time rapidly (38, 39, 38, 39, etc), leading me to believe the motor is not putting out enough torque to turn the axis. When I attempt to slew at a high speed, and motor sounds like it is struggling, making a bad racket, but is able to rotate the axis. Seems like it's just facing more friction than it is expecting, perhaps? I've tried adjusting the backlash at three levels (tight, loose, medium) but it seems not to have an effect. Maybe I need to relubricate the RA gear teeth? Is WD-40 recommended, or something else? I'd like to not experiment much more until I know a fix, as I am worried about damaging the motor. Any advice is welcome.

 

Rix


--
Dino Monaco


Virus-free. www.avast.com


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Dino Monaco
 

Sorry I just joined the group and late to what you have already tried.
A curious question: if you remove the belt completely so that you can isolate only the motor,  
Then activate the RA do you still hear the sound?
If yes then motor is perhaps the issue.
If no, then try like you said and realign the worm not too tightly. 
Is the sound happening under full payload with all gear attached only?.
How about without the payload.
My apologies if you have already tried these simple checks


On Jan 10, 2021, at 3:22 PM, Rix Yarbrough <yarbroughrix@...> wrote:


Just to update- still have not resolved my problem. I have adjusted backlash and balance to hell and back but no luck at all. Here is a video of the problem, which I hope will help someone identify it exactly. 
As you can (sort of) see; the RA motor is only able to chug the gear forward bit by bit, making an awful sound in the process. The payload is balanced in my opinion perfectly, but to be sure I have also tried moving the CW’s back and forth both tiny and large amounts, but in the very best circumstances the motion only becomes a slight bit more constant. Still it chugs and the noise continues. It is possible that I have messed something up in the gear adjustment process- I sometimes get side/side movement of the worm shaft which according to the tutorial aforementioned is solved by tightening a screw in the right block. However, my screw feels completely impossible to move, so my solution has been to loosen the blocks holding in both ends of the worm gear shaft, move them to one side, and tighten them again- which seems to fix the problem. I say seems because although the back/forth motion goes away, it *could* create some directional strain or make the gear meet the belt at a bad angle, but I have really no idea. The gear doesn't feel too tight to turn, so I sort of doubt it.
So what the actual hell is going on here? Open to crackpot theories, although I’m hoping the answer is simple and obvious to someone more knowledgeable than myself. 

Rix


On Tue, Dec 29, 2020 at 16:28 yarbroughrix via groups.io <yarbroughrix=gmail.com@groups.io> wrote:

Got a used iEXOS-100 and was finally able to diagnose my issue: it seems that the RA motor, in particular, is struggling to move the mount. When connected to the app and tracking, the motors can be heard "chugging" as if they are struggling. The explorestars app shows that when tracking, the RA axis just flips back and forth one arc second at a time rapidly (38, 39, 38, 39, etc), leading me to believe the motor is not putting out enough torque to turn the axis. When I attempt to slew at a high speed, and motor sounds like it is struggling, making a bad racket, but is able to rotate the axis. Seems like it's just facing more friction than it is expecting, perhaps? I've tried adjusting the backlash at three levels (tight, loose, medium) but it seems not to have an effect. Maybe I need to relubricate the RA gear teeth? Is WD-40 recommended, or something else? I'd like to not experiment much more until I know a fix, as I am worried about damaging the motor. Any advice is welcome.

 

Rix


--
Dino Monaco


Re: iEXOS-100 RA axis motor struggles, doesn't track #iEXOS-100 #goto #tracking

Rix Yarbrough <yarbroughrix@...>
 

Just to update- still have not resolved my problem. I have adjusted backlash and balance to hell and back but no luck at all. Here is a video of the problem, which I hope will help someone identify it exactly. 
As you can (sort of) see; the RA motor is only able to chug the gear forward bit by bit, making an awful sound in the process. The payload is balanced in my opinion perfectly, but to be sure I have also tried moving the CW’s back and forth both tiny and large amounts, but in the very best circumstances the motion only becomes a slight bit more constant. Still it chugs and the noise continues. It is possible that I have messed something up in the gear adjustment process- I sometimes get side/side movement of the worm shaft which according to the tutorial aforementioned is solved by tightening a screw in the right block. However, my screw feels completely impossible to move, so my solution has been to loosen the blocks holding in both ends of the worm gear shaft, move them to one side, and tighten them again- which seems to fix the problem. I say seems because although the back/forth motion goes away, it *could* create some directional strain or make the gear meet the belt at a bad angle, but I have really no idea. The gear doesn't feel too tight to turn, so I sort of doubt it.
So what the actual hell is going on here? Open to crackpot theories, although I’m hoping the answer is simple and obvious to someone more knowledgeable than myself. 

Rix


On Tue, Dec 29, 2020 at 16:28 yarbroughrix via groups.io <yarbroughrix=gmail.com@groups.io> wrote:

Got a used iEXOS-100 and was finally able to diagnose my issue: it seems that the RA motor, in particular, is struggling to move the mount. When connected to the app and tracking, the motors can be heard "chugging" as if they are struggling. The explorestars app shows that when tracking, the RA axis just flips back and forth one arc second at a time rapidly (38, 39, 38, 39, etc), leading me to believe the motor is not putting out enough torque to turn the axis. When I attempt to slew at a high speed, and motor sounds like it is struggling, making a bad racket, but is able to rotate the axis. Seems like it's just facing more friction than it is expecting, perhaps? I've tried adjusting the backlash at three levels (tight, loose, medium) but it seems not to have an effect. Maybe I need to relubricate the RA gear teeth? Is WD-40 recommended, or something else? I'd like to not experiment much more until I know a fix, as I am worried about damaging the motor. Any advice is welcome.

 

Rix


Re: #EXOS2 My RA on my mount is wiggling, Causing Star Trailing!!! #EXOS2

Jennifer Shelly
 

Joseph:

I used to own an Exos-2 PMC-8 and have been through the tuning exercise multiple times.  It appears your image of the star trail is exposing nice round stars for the majority of your exposure time then something happens and the stars appear to be shifting to the left for a small amount of the exposure time.  Does that sound correct?  The reason I say this is because it appears you have a bright star and a faint star right next to it like a ghost or like the mount is skipping.

A few things come to mind.  Is it possible a cable is getting snagged? Is your counterweight fully secured and not able to slide down the counterweight bar? Are you absolutely sure you are balanced in both the RA and DEC axis? My old Exos-2 had stiction in the RA axis and when I thought I balanced I really was not. Have you manually rotated the RA axis by hand to check for any tight spots on the worm ring gear? Try rotating by hand 180° and see if your wiggle is better or worse.  In the video you demonstrate wiggle by grabbing your guide scope and moving it side-to-side.  What does the wiggle look like when you do the same to the counterweight bar? If the wiggle is less then you will need to figure out what is causing the wiggle in your imaging train.  You mentioned that you have tightened the RA clutch as far as it will go.  Since the worm wheel gear is made out of aluminum it is possible create an indent in the worm wheel gear from over tightening which would be exaggerate the natural high and low spots on the worm ring gear.

Sorry if this is too much, I just wanted to list everything that came to mind. I hope this helps.
--
Sincerely,

Jennifer Shelly
AstroPorch, VA

Mounts
: ES PMC-8 G-11, ES PMC-8 iEXOS-100
Scopes: ES ED127 FCD-100, Askar FRA 400, ES Levy Comet Hunter, ES N208CF, QHY Mini Guide Scope, Solomark F60 Guide Scope
Cameras: QHY600M, QHY128C, QHY168C
Misc: MoonLite CFL 2.5 / High Res Stepper / V2 Mini Controller, Baader SteelTrack NT / SteelDrive II, Baader UFC, Optolong 2" L-Pro / L-eNhance, QHY CFW3-L, Baader 2” LRGBSHO CCD
Imaging Software:  NINA, APT, SharpCap Pro
Processing Software: PixInsight, Lightroom, Premiere Elements


Re: #EXOS2 My RA on my mount is wiggling, Causing Star Trailing!!! #EXOS2

jdavis1278@...
 

There are a couple of videos on Youtube about adjusting the RA wiggle that happens sometimes with the IExos100 and Exos2... I know the adjustment for the iexos100 requires you to take the cover off and do some simple adjusting to the screws holding the gears on. 

Iexos100 vid: https://youtu.be/mLXE_BMKVAw
I'm not sure if that's helpful or if they're too dis-similar for that to help


Re: #EXOS2 My RA on my mount is wiggling, Causing Star Trailing!!! #EXOS2

nickerson.joseph@...
 

Email is sent, when I clicked your link it posted as tyler@explorescien, I assumed it was tyler@... and sent it.


Re: IEXOS-100 can't get round stars due to RA erros? #iEXOS-100

Wes Mcdonald
 

Yi

1.  I saw PHD recommended you focus your guide camera.  PRobably should do that.

2.  MAke sure your guide star is not saturated.  

3.  Dont use PEC algorithm, ust go with the normal ysterisis and resist switch I believe.

4.  MAke sure your PA is pretty go so you do not get field rotation.  Field rotation will make the stars look like this even though the guiding is good.

5  What did you say your RMS total guide error was?  1.x arc seconds?  This is excellent.

If your RMS guide error is low like that then you have terrible PA.  

Ask PHD to evaluate your PA.  How are you polar aligning?

Just some thoughts.  

Wes.




--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired

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