Mach1 Unable to Find Home Position Suddenly


Ron Kramer
 

I balance and free clutch often. To get it back - I tell it to PARK 3.   I wait until it's done - then I align the 2 marks and good to go.  A plate solve then nails it. 


On Sun, Mar 22, 2020 at 1:37 PM Dominique Durand via Groups.Io <dom33.durand=yahoo.com@groups.io> wrote:

[Edited Message Follows]

Hi Mikko,
Frankly, nothing simpler on a Mach1 I still have the CP3 and I also had a CP4 with a station made with the keypad. Since I am near the meridian of Geenwich I chose to operate in UT (PC and Keypad) with the correct GPS coordinates from where I am. Either the frame is already parked and it stands out (I chose this option) upon ignition with a polar alignment possibly done with the RAPAS or with the routine polaris +1 star on the keypad if I was not in fixed pose. As I had concerns with the local time at the beginning, the best for me was to operate in UT keypad and PC.In the event of non-prior parking, this seems simple nevertheless. Once the mount is on and oriented to the north compass, we put it in park3 for example, we position the mount (Disengaging the brakes) to be in the park3 position and we apply the brakes. Then we do a goto on an easily identifiable star, we synchronize on the keypad and then we redo a park3 to see where the mount is parked. We turn off then on. unpark is automatic (If provided) and then just choose an object and do goto ... we are on it or we are not far ...If on the keypad the GPS coordinates and the Dates / times are OK this can only work ...
Thank you to Roland and his team A.P. for offering us frames that manage so simply.

Dominique




Mikko Viljamaa
 

Ron if I understand correctly what you say, that's exactly what I used to do before this saga started.


- Mikko


Mikko Viljamaa
 

The pier/tripod is not perpendicular to the earth's center.
* The mount is not "perfectly" polar aligned
* The optical axis is not aligned with the mount's mechanical axis.

Well, as said nothing has changed. The pier and the mount has been in the same position for two years and the polar align should be spot on according to Polemaster and PHD. I can check that again but I would be surprised if something has changed.


- Mikko


Ray Gralak
 

Hi Mikko,

that's exactly what I used to do before this saga started.
The part that I think needlessly worried you is that after a plate solve + recal you expected the mount to return exactly to the marks where it started. If the plate solve + sync changes the RA/Dec coordinates then the mount's park position will be slightly off. That does not matter as you discovered when unparking from last parked position.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver


-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Mikko Viljamaa
Sent: Monday, March 23, 2020 7:00 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

Ron if I understand correctly what you say, that's exactly what I used to do before this saga started.


- Mikko


Ray Gralak
 
Edited

Well, as said nothing has changed. The pier and the mount has been in the same position for two years and the
polar align should be spot on according to Polemaster and PHD. I can check that again but I would be surprised if
something has changed.
Even if the mount *is* well polar aligned there can be pointing errors from other sources. Once you plate solve+sync that will change the relative position of the Park positions. I think you just didn't notice that in the previous two years of use. Once you did you notice you thought there was a problem when there really wasn't one.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver


-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Mikko Viljamaa
Sent: Monday, March 23, 2020 7:09 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

The pier/tripod is not perpendicular to the earth's center.
* The mount is not "perfectly" polar aligned
* The optical axis is not aligned with the mount's mechanical axis.

Well, as said nothing has changed. The pier and the mount has been in the same position for two years and the
polar align should be spot on according to Polemaster and PHD. I can check that again but I would be surprised if
something has changed.


- Mikko


Mikko Viljamaa
 

Well after two successful nights when I thought that my problems are behind me I now have two nights again when the plate solve won't work work. And when I say won't work I mean that the mount is so much off that a blind solve is needed before any target is found. The good news is that the mount finds it home position just fine.

I'm still trying to understand the relationship between the LST and the RA. If the difference should be 6 hours when initialized and then increase 15 arc sec per second, shouldn't the difference then be always more than 6 hours? If you look at the photo below, you'll see that this is not the case. Could this explain my issue again?


Thanks,

Mikko


Matthieu BUI
 

Did the computer go to summer time ?

Le 1 avr. 2020 à 15:42, Mikko Viljamaa <mikko.viljamaa@...> a écrit :

Well after two successful nights when I thought that my problems are behind me I now have two nights again when the plate solve won't work work. And when I say won't work I mean that the mount is so much off that a blind solve is needed before any target is found. The good news is that the mount finds it home position just fine.

I'm still trying to understand the relationship between the LST and the RA. If the difference should be 6 hours when initialized and then increase 15 arc sec per second, shouldn't the difference then be always more than 6 hours? If you look at the photo below, you'll see that this is not the case. Could this explain my issue again?


Thanks,

Mikko

<IMG_1150.jpg>


Ray Gralak
 

Hi Mikko,

I'm still trying to understand the relationship between the LST and the RA. If the difference should be 6 hours
when initialized and then increase 15 arc sec per second, shouldn't the difference then be always more than 6
hours? If you look at the photo below, you'll see that this is not the case. Could this explain my issue again?
The difference between LST and RA is called the "Hour Angle" and will vary depending on where the scope is pointing.

Hour Angle is 0 at the meridian, which is the imaginary line running from the North celestial pole to the South celestial pole.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Mikko Viljamaa
Sent: Wednesday, April 1, 2020 6:42 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

Well after two successful nights when I thought that my problems are behind me I now have two nights again
when the plate solve won't work work. And when I say won't work I mean that the mount is so much off that a
blind solve is needed before any target is found. The good news is that the mount finds it home position just fine.

I'm still trying to understand the relationship between the LST and the RA. If the difference should be 6 hours
when initialized and then increase 15 arc sec per second, shouldn't the difference then be always more than 6
hours? If you look at the photo below, you'll see that this is not the case. Could this explain my issue again?


Thanks,

Mikko



Mikko Viljamaa
 

OK, so no LST. Then I'm out of ideas what could cause this. I would like to think that daylight saving or something else would force this but as it again worked just fine a couple of times, I cannot believe time would be the cause. Unless something somewhere feeds the mount wrong time information even though all visible timepieces are correct.

Any other ideas of what to try?


- Mikko


Steve Reilly
 

I can’t offer much as I haven’t followed this carefully but how many programs are connected to the mount? Have you initialized with only the hand controller?

 

-Steve

 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Mikko Viljamaa
Sent: Wednesday, April 1, 2020 11:33 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

 

OK, so no LST. Then I'm out of ideas what could cause this. I would like to think that daylight saving or something else would force this but as it again worked just fine a couple of times, I cannot believe time would be the cause. Unless something somewhere feeds the mount wrong time information even though all visible timepieces are correct.

Any other ideas of what to try?


- Mikko


Mikko Viljamaa
 

Where else could there be time settings which would confuse the Mount or the program? This one is spot on...


- Mikko


Mikko Viljamaa
 

Steve no hand controller. Never changed anything from what I have done from the day 1. Just suddenly having plate solve problems and trying to understand what's causing them. 


- Mikko


Steve Reilly
 

I understand but which programs are connected to the mount? For example I use ACP to image with and have APCC Pro so I have the ACP configured to connect to the ASCOM Driver, APCC to connect via the IP address (CP4), MaxIm has no need to be connected to the mount nor does FocusMax as all my focusing is done using ACP calling for FocusMax to focus to a star that ACP has picked, no connection to TheSkyX as I don’t have that active, and so on. But anything that might be connected otherwise is being connected via the virtual port on APCC.

 

Another question would be what program are you using to plate solve? ACP uses the catalog I have the path set for in ACP preferences and solves accordingly. If that fails it will do an offset slew, take another image and try again. If that fails then it tries a blind solve through Astrometry. Hope this makes some sense.

 

-Steve

 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Mikko Viljamaa
Sent: Wednesday, April 1, 2020 11:59 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

 

Steve no hand controller. Never changed anything from what I have done from the day 1. Just suddenly having plate solve problems and trying to understand what's causing them. 


- Mikko


Mikko Viljamaa
 

Thanks Steve, all ideas are appreciated.

Sequence Generator Pro does everything for me so Mach1 is connected through the ASCOM. I used Platesolve2 previously for plate solving but recently changed to ASTAP it being faster. The last two nights I have tried both plate solves with same results meaning a blind solve is needed before a plate solve works and understands where the Mount is pointing to.


- Mikko


Roland Christen
 

Are you unparking from previous position? Or are you forcing the mount to unpark from one of the 4 park positions?

Rolando



-----Original Message-----
From: Mikko Viljamaa <mikko.viljamaa@...>
To: main <main@ap-gto.groups.io>
Sent: Wed, Apr 1, 2020 11:26 am
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

Thanks Steve, all ideas are appreciated.

Sequence Generator Pro does everything for me so Mach1 is connected through the ASCOM. I used Platesolve2 previously for plate solving but recently changed to ASTAP it being faster. The last two nights I have tried both plate solves with same results meaning a blind solve is needed before a plate solve works and understands where the Mount is pointing to.


- Mikko


Joe Zeglinski
 

Mikko.
 
    Why are you avoiding the button for Windows  to set Time Zone automatically?
It can sometimes be set to a convenient USA west coast one, by some USA software installers, perhaps even during  Microsoft major half-yearly Updates.
 
    I would check that box – couldn’t hurt.  Might explain why your time might be correct, but not for your time zone.
Otherwise, why would Microsoft have this option box?
 
Joe
 

From: Mikko Viljamaa
Sent: Wednesday, April 1, 2020 11:56 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly
 
Where else could there be time settings which would confuse the Mount or the program? This one is spot on...


- Mikko


Mikko Viljamaa
 

Unparking now from the last position as instructed earlier. Mach finds it's home now nicely.

- Mikko


Mikko Viljamaa
 

Thanks Joe, I have never touched it but worth trying...


- Mikko


Roland Christen
 


Unparking now from the last position
I recommend to always do this for mounts that are never moved and have permanent scope setups.

Rolando


-----Original Message-----
From: Mikko Viljamaa <mikko.viljamaa@...>
To: main <main@ap-gto.groups.io>
Sent: Wed, Apr 1, 2020 11:41 am
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

Unparking now from the last position as instructed earlier. Mach finds it's home now nicely.

- Mikko


Cheng-Yang Tan
 

Hi Rolando,
  What is the difference between unparking from last park and unparking from a specified park position when I startup? FYI, I always start from park3.

My setup is mobile, but I don't usually loosen the clutches or unload the spring levers for balance when I setup and start from Park3. So which way is the recommended way for mobile setups?

cytan

On Wednesday, April 1, 2020, 11:44:56 AM CDT, uncarollo2 <chris1011@...> via groups.io <chris1011@...> wrote:



Unparking now from the last position
I recommend to always do this for mounts that are never moved and have permanent scope setups.

Rolando


-----Original Message-----
From: Mikko Viljamaa <mikko.viljamaa@...>
To: main <main@ap-gto.groups.io>
Sent: Wed, Apr 1, 2020 11:41 am
Subject: Re: [ap-gto] Mach1 Unable to Find Home Position Suddenly

Unparking now from the last position as instructed earlier. Mach finds it's home now nicely.

- Mikko