Date   

Re: Mach2 - Elongated stars

yanzhe liu
 

Ray,

I am able to run "AP Log Zipper", there are 2 files shown in the app: ap.ini and Setting.apdb, however both were dated 12/29/2018. Maybe I did not enable ASCOM log.

Yanzhe

On Sun, Mar 7, 2021 at 7:37 PM Ray Gralak <iogroups@...> wrote:
Yanhze,

> Where is ASCOM driver log? I dont use APCC, I use SGPro.

The AP V2 ASCOM driver, which you must use with SGPro, comes with a log zipper utility called "AP Log Zipper". You should be able to find it from the Windows start menu by typing that name. The utility will grab the log files for X number of days in the past. If you can't find it, you probably didn't install it when you installed the AP V2 driver. In that case, just reinstall the AP V2 driver and select the option to install it.

BTW, you can use APCC with SGPro. In fact, it is recommended. An APCC Pro license comes with your Mach2 mount, but you must contact A-P to get it.

-Ray


> -----Original Message-----
> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of yanzhe liu
> Sent: Sunday, March 7, 2021 4:19 PM
> To: main@ap-gto.groups.io
> Subject: Re: [ap-gto] Mach2 - Elongated stars
>
> Ray,
>
> Where is ASCOM driver log? I dont use APCC, I use SGPro.
>
> Yanzhe
>
> On Sun, Mar 7, 2021 at 10:45 AM Ray Gralak <iogroups@...> wrote:
>
>
>       Hi Yanzhe,
>
>       Can you zip and post your PHD2 logs, as well as APCC/AP V2 ASCOM driver logs?
>
>       There might be something useful there.
>
>       -Ray
>
>       > -----Original Message-----
>       > From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of yanzhe liu
>       > Sent: Sunday, March 7, 2021 10:12 AM
>       > To: main@ap-gto.groups.io
>       > Subject: Re: [ap-gto] Mach2 - Elongated stars
>       >
>       > Roland,
>       >
>       > I will check my mount serial number later as I just packed everything due to rain forecast.
>       >
>       > My camera's orientation was 0/180 degree, so I assume top to bottom elongation would be DEC.
>       >
>       > I dont have any picture of my setup, I just tore it down since it will be rainy this week. My setup is
>       > FSQ106+OAG+16803, image scale is 3.5".
>       > I was imaging Rosetta Nebula, after it was just past meridian for 2-3 hours.
>       >
>       > I used PHD2 drift for PA, it reported <5' PA error, I am waiting for polemaster adapter so I can confirm I get
> good PA
>       > next time.
>       >
>       > DEC was out of balance because my setup was rear end heavy, if it was in balance position then I could
> not rotate
>       > my CCD in all directions. My guess is that the DEC balance was off by less than 1lb. In the next test, I can
> balance
>       > DEC to see if the issue still exists.
>       >
>       > My suspicion is that if DEC balance is off, then DEC might creep under gravity, even PA is perfect. So you
> might
>       > see DEC continually drift  then gets corrected by PHD2 periodically.
>       >
>       > Yanzhe
>       >
>       > On Sun, Mar 7, 2021 at 9:35 AM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
>       >
>       >
>       >       Couple of questions:
>       >
>       >
>       >       1 - what's the mount's serial number
>       >       2 - which axis is the elongation
>       >       3 - which direction was the scope pointing (RA-Dec)
>       >       4 - what scope and focal length or what is the arc sec per pixel.
>       >       5 - do you have a picture of your setup?
>       >
>       >
>       >
>       >       One comment about balance - it should be easy for you to completely balance the scope with the
> clutches
>       > loose. Can you estimate how many lb out of balance your scope is in Dec? Normally i would not think this
> would
>       > have any effect, but doesn't hurt to check this.
>       >
>       >
>       >
>       >       Roland Christen
>       >       Astro-Physics Inc.
>       >
>       >
>       >
>       >
>       >       -----Original Message-----
>       >       From: yanzhe liu <liuyanzhe@...>
>       >       To: main@ap-gto.groups.io
>       >       Sent: Sun, Mar 7, 2021 12:44 am
>       >       Subject: [ap-gto] Mach2 - Elongated stars
>       >
>       >
>       >       Testing new mach2 for a couple of nights. It works great out of the box and I am very pleased.
>       >
>       >       One issue bothering me is that I got slightly elongated stars across the entire image (15min Ha sub).
>       >       The exact same telescope/CCD were used with another mount and stars were round, I am wondering
> what I
>       > should check (I think there was due to some setup issue, but I could not figure it out).
>       >       - Used OAG for guiding, so there should not be any flexure.
>       >       - CCD orientation was 0/180 degree. The stars were elongated top to bottom.
>       >       -  I did polar alignment with PHD2 drift align. PA error should be < 5'. The field rotation of each sub is
> ~0.01
>       > degree, much larger than the other system (but elongated stars do not look like field rotation, they were
> same
>       > across the image)
>       >       - Both RA and DEC guiding curves looked smooth, had similar RMS. DEC correction was mainly to
> one
>       > direction.
>       >       - DEC balance was slightly off, camera heavy. Is Mach2 DEC sensitive to this? Will the guiding/image
> be
>       > affected?
>       >
>       >       I dont think any of the above is of particular concern, except DEC balance. Any comment/help is
> appreciated.
>       >
>       >       --
>       >       Roland Christen
>       >       Astro-Physics
>       >
>       >
>       >
>       >
>       >
>       >
>
>
>
>
>
>
>
>
>







Re: counterweight up slews in APPC Pro with Sequence Generator Pro

 

>>>They have not figured out yet that sending the mount via a relative time move, such as is used in every autoguiding program


i am fairly sure most (all?) imaging applications that use platesolving and centering routines do this as well, i don't think it's unique to SGP

goto-platesolve-Sync and repeat until the target is within the centering tolerance



On Wed, Mar 10, 2021 at 7:07 PM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:

I have found that CW up slews within the East limits are slow due to all the safety slews. So for example, if plate solving takes three tries, the mount will go back and forth in and out of East limits three times to move a handful of pixels.
That is because SGP sends a new co-ordinate, a co-ordinate slew, to the mount. It is basically sending the mount to a new position each time, so that always triggers a safety slew when the scope is under the mount. They have not figured out yet that sending the mount via a relative time move, such as is used in every autoguiding program, will move the mount a few pixels without encountering this safety slew issue. A relative move is a timed move at sidereal rate. So moving 15 arc seconds simply sends the mount at 1x sidereal for 1 second.

Rolando


-----Original Message-----
From: Luca Marinelli <photo@...>
To: main@ap-gto.groups.io
Sent: Wed, Mar 10, 2021 8:31 pm
Subject: Re: [ap-gto] counterweight up slews in APPC Pro with Sequence Generator Pro

Duncan,

I have used it and you don't have to do anything special in SGP. APCC has to be setup with East and West meridian limits and the checkbox to allow CW up slews within East limits needs to be checked. Ray can correct me if I am wrong. SGP will just issue a slew command to specific coordinates. APCC realizes that it can access those coordinate in a CW up position within the East limits and it goes there.

Ultimately, I stopped using this feature. While it is appealing in principle, I have found that CW up slews within the East limits are slow due to all the safety slews. So for example, if plate solving takes three tries, the mount will go back and forth in and out of East limits three times to move a handful of pixels. In the end, meridian flips are easy and work well so I find that I waste less imaging time with an automated meridian flip than the overhead of all the CW up safety slews.

Have you set up automated meridian flips in SGP? SGP is able to take full advantage of the declination-dependent meridian limits in APCC.

Luca

--
Roland Christen
Astro-Physics



--
Brian 



Brian Valente


Re: counterweight up slews in APPC Pro with Sequence Generator Pro

Roland Christen
 


I have found that CW up slews within the East limits are slow due to all the safety slews. So for example, if plate solving takes three tries, the mount will go back and forth in and out of East limits three times to move a handful of pixels.
That is because SGP sends a new co-ordinate, a co-ordinate slew, to the mount. It is basically sending the mount to a new position each time, so that always triggers a safety slew when the scope is under the mount. They have not figured out yet that sending the mount via a relative time move, such as is used in every autoguiding program, will move the mount a few pixels without encountering this safety slew issue. A relative move is a timed move at sidereal rate. So moving 15 arc seconds simply sends the mount at 1x sidereal for 1 second.

Rolando


-----Original Message-----
From: Luca Marinelli <photo@...>
To: main@ap-gto.groups.io
Sent: Wed, Mar 10, 2021 8:31 pm
Subject: Re: [ap-gto] counterweight up slews in APPC Pro with Sequence Generator Pro

Duncan,

I have used it and you don't have to do anything special in SGP. APCC has to be setup with East and West meridian limits and the checkbox to allow CW up slews within East limits needs to be checked. Ray can correct me if I am wrong. SGP will just issue a slew command to specific coordinates. APCC realizes that it can access those coordinate in a CW up position within the East limits and it goes there.

Ultimately, I stopped using this feature. While it is appealing in principle, I have found that CW up slews within the East limits are slow due to all the safety slews. So for example, if plate solving takes three tries, the mount will go back and forth in and out of East limits three times to move a handful of pixels. In the end, meridian flips are easy and work well so I find that I waste less imaging time with an automated meridian flip than the overhead of all the CW up safety slews.

Have you set up automated meridian flips in SGP? SGP is able to take full advantage of the declination-dependent meridian limits in APCC.

Luca

--
Roland Christen
Astro-Physics


Re: counterweight up slews in APPC Pro with Sequence Generator Pro

Luca Marinelli
 

Duncan,

I have used it and you don't have to do anything special in SGP. APCC has to be setup with East and West meridian limits and the checkbox to allow CW up slews within East limits needs to be checked. Ray can correct me if I am wrong. SGP will just issue a slew command to specific coordinates. APCC realizes that it can access those coordinate in a CW up position within the East limits and it goes there.

Ultimately, I stopped using this feature. While it is appealing in principle, I have found that CW up slews within the East limits are slow due to all the safety slews. So for example, if plate solving takes three tries, the mount will go back and forth in and out of East limits three times to move a handful of pixels. In the end, meridian flips are easy and work well so I find that I waste less imaging time with an automated meridian flip than the overhead of all the CW up safety slews.

Have you set up automated meridian flips in SGP? SGP is able to take full advantage of the declination-dependent meridian limits in APCC.

Luca


counterweight up slews in APPC Pro with Sequence Generator Pro

Duncan Hanford
 

Has anybody been able to make counterweight up slews work in APCC Pro when using Sequence Generator Pro Framing and Mozaic wizard to initiate the slew?


Re: Quick Release Gearbox Modification for Older AP1600

Worsel
 

Jack

I use the PowerWerx for balance on the 1100.  I slew at 255 or even 600 rate.  You can use either amps or watts.  For each axis, if I can get up versus down plus/minus 1 W (roughly plus/minus 0.1A at normal voltage), then I consider that 'balanced.' 

Bryan


Re: Quick Release Gearbox Modification for Older AP1600

Woody Schlom
 

Jack,

 

Yes on the Nylon-tipped clutch bolts, but that’s not I greased.  At least on my Mach1, I believe there’s a sleeve bearing involved and a big flat greased surface between the two parts – not the edges where the clutch bolts contact.  But our mounts are very different I’m sure.  Opposed to Takahashi or Losmandy mounts, on my Mach1, the clutch system doesn’t ride on ball or roller bearings – just greased surfaces. 

 

Don’t know why the PowerWerks meter didn’t show you current (amp) differences.  I know you’ve got a monster of a huge and powerful mount, but it should still show a current load difference for an out-of-balance mount.  Perhaps slew at a faster speed?  And instead of starting with the CW shaft level, start below level so there’s more room for it to move at a faster slew rate?

 

And do make sure you’re looking at amps and not volts.  Volts “should” stay the same.  It’s the current or amps value that should change with how hard the motor is working.

 

If your mount is anything like mine, the grease thickness in the clutch system thins over time – so friction increases over the years.  I know that when I took mine apart, there was little grease left in the clutch system and after applying new grease to the friction surfaces (not where those spring-loaded bolts press), it was a lot easier to balance.

 

I’m surprised Roland or somebody from AP hasn’t suggested something.

 

Woody

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Jack Huerkamp
Sent: Wednesday, March 10, 2021 4:27 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Quick Release Gearbox Modification for Older AP1600

 

Woody,

As far as re-greasing the clutches, I do not see a way to do that.  I removed the clutch bolts before and, if memory serves me, they had nylon tips that pressed against the internal metal disc.  

Regarding the PowerWerx in-line meter, I had purchased one years ago to do exactly what you suggested.  I placed the counterweight bar parallel to the ground on the east side of the mount, slowly slewed the weights up and down and did not see a change in current.  I then moved the mount to place the counterweights on the west side of the mount - ditto.  Maybe at that time the mount was better balanced.  I will pull out the meter and rerun the current test.

Thanks for reminding me about using the meter.

Jack


Re: Quick Release Gearbox Modification for Older AP1600

Jack Huerkamp
 

Woody,

As far as re-greasing the clutches, I do not see a way to do that.  I removed the clutch bolts before and, if memory serves me, they had nylon tips that pressed against the internal metal disc.  

Regarding the PowerWerx in-line meter, I had purchased one years ago to do exactly what you suggested.  I placed the counterweight bar parallel to the ground on the east side of the mount, slowly slewed the weights up and down and did not see a change in current.  I then moved the mount to place the counterweights on the west side of the mount - ditto.  Maybe at that time the mount was better balanced.  I will pull out the meter and rerun the current test.

Thanks for reminding me about using the meter.

Jack


Re: VIDEO - Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount

Harley Davidson
 

Thanks Rolando.

tony

On 3/9/2021 7:13 PM, Roland Christen via groups.io wrote:
Clever!

Rolando



-----Original Message-----
From: Harley Davidson <astrocnc@...>
To: Howard (@ AP) <howard@...>; main@ap-ug.groups.io; main@ap-gto.groups.io
Sent: Tue, Mar 9, 2021 4:00 pm
Subject: [ap-gto] VIDEO - Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount

I ended up "modifying" an Astro-Physics DOVEKREP so it would work with the 1600GTO Mount.

Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount
https://www.youtube.com/watch?v=ULDkyZh4GqM


tony

--
Roland Christen
Astro-Physics


Re: How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Worsel
 

Is that before or after the Jello goes in?

Bryan


Re: How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Bill Long
 

Bonus that you can have a shot after each motor and wheel combo is complete as you go. 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Roland Christen via groups.io <chris1011@...>
Sent: Tuesday, March 9, 2021 4:16 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?
 
Everclear will work too and it's not hazardous Stuck out tongue winking eye

Rolando



-----Original Message-----
From: Worsel via groups.io <bryancashion@...>
To: main@ap-gto.groups.io
Sent: Tue, Mar 9, 2021 5:18 pm
Subject: Re: [ap-gto] How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Mike

Thanks for the upload!  They are much more useful than the one I received.

George: Thanks for the offer.  As you know, I got the file from Mike.

RE: Solvent.

I was not keen on mineral spirits just from a personal exposure perspective.  I used 99% isopropyl alcohol (IPA).  It removes solvent well AND evaporates quickly.  Since it is just one compound, rather than a mix, it should all evaporate, rather than leave a less volatile compound from the mix behind.

To be clear, IPA is also hazardous, but less so than mineral spirits.

See pics for before and after of worm wheel.


Bryan

--
Roland Christen
Astro-Physics


Re: How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Roland Christen
 

Everclear will work too and it's not hazardous Stuck out tongue winking eye

Rolando



-----Original Message-----
From: Worsel via groups.io <bryancashion@...>
To: main@ap-gto.groups.io
Sent: Tue, Mar 9, 2021 5:18 pm
Subject: Re: [ap-gto] How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Mike

Thanks for the upload!  They are much more useful than the one I received.

George: Thanks for the offer.  As you know, I got the file from Mike.

RE: Solvent.

I was not keen on mineral spirits just from a personal exposure perspective.  I used 99% isopropyl alcohol (IPA).  It removes solvent well AND evaporates quickly.  Since it is just one compound, rather than a mix, it should all evaporate, rather than leave a less volatile compound from the mix behind.

To be clear, IPA is also hazardous, but less so than mineral spirits.

See pics for before and after of worm wheel.


Bryan

--
Roland Christen
Astro-Physics


Re: VIDEO - Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount

Roland Christen
 

Clever!

Rolando



-----Original Message-----
From: Harley Davidson <astrocnc@...>
To: Howard (@ AP) <howard@...>; main@ap-ug.groups.io; main@ap-gto.groups.io
Sent: Tue, Mar 9, 2021 4:00 pm
Subject: [ap-gto] VIDEO - Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount

I ended up "modifying" an Astro-Physics DOVEKREP so it would work with the 1600GTO Mount.

Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount
https://www.youtube.com/watch?v=ULDkyZh4GqM


tony

--
Roland Christen
Astro-Physics


Re: How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Worsel
 

Mike

Thanks for the upload!  They are much more useful than the one I received.

George: Thanks for the offer.  As you know, I got the file from Mike.

RE: Solvent.

I was not keen on mineral spirits just from a personal exposure perspective.  I used 99% isopropyl alcohol (IPA).  It removes solvent well AND evaporates quickly.  Since it is just one compound, rather than a mix, it should all evaporate, rather than leave a less volatile compound from the mix behind.

To be clear, IPA is also hazardous, but less so than mineral spirits.

See pics for before and after of worm wheel.


Bryan


Re: Quick Release Gearbox Modification for Older AP1600

Woody Schlom
 

Actually it’s not the clutch surfaces that need lubrication, but the clutch bearings – which are not ball or roller bearings – at least on the original Mach1.

 

And in just looking this up in my Mach1 manual, I see that not all AP mounts use the same systems.  My Mach1 manual states that its clutch system is different than the AP-900 and AP-1200 and has more friction than either of them.  So the AP-1600 could be completely different.

 

And no, it’s been so long since I re-greased my Mach1’s clutch bearings, I don’t remember how I did it.  But it did NOT involve getting into the drive gears at all.

 

I’m not usually one to just tear down a fine mount without guidance, so I must have found some guidance somewhere – most likely from this group.

 

I’ll look into my long-ago notes and see if I can find something.  But hopefully somebody else with more knowledge and experience will step in here.

 

Woody

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of W Hilmo
Sent: Tuesday, March 9, 2021 2:13 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Quick Release Gearbox Modification for Older AP1600

 

I’ve not heard of a procedure for lubricating the clutches on these mounts.

 

Do you have a pointer to instructions?  My AP1600 declination clutch is pretty stiff, and has been since day one, but it’s nothing that’s a problem to work with.  I’m mainly just curious.

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Woody Schlom
Sent: Tuesday, March 9, 2021 12:49 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Quick Release Gearbox Modification for Older AP1600

 

Jack,

 

That does seem like a lot of friction.  I’m not sure about the AP1600’s clutch mechanism, but I suspect my old Mach1 is similar.  And in that case, the clutch system can be lubricated independently of the drive gear system.  And it’s a lot easier too.

 

Another suggestion.  You mention the electronic fish scale balancing system (which is my preference) for balancing.  But have you tried the motor current load method to see how well that might work for you?  I’m pretty sure you already have a PowerWerx voltage/current meter.  So you can try that method and see if it works any better for you.  When slewing (I used slow slew speeds) the motor current load should be the same in both directions.

 

But I’d start with re-greasing the clutch system first.  And so far as I understand it, that doesn’t require the fancy greases that come in the AP grease kit.  In fact, I wouldn’t be surprised if the clutch parts do better with a different kind of grease.  I believe I used a SuperLube synthetic grease for my clutch bearings.

 

I know that when I re-greased the clutch bearing system in my Mach1, it made a lot of difference.

 

Woody

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Jack Huerkamp
Sent: Tuesday, March 9, 2021 7:45 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Quick Release Gearbox Modification for Older AP1600

 

JimP, granted the AP1600 offers resistance to movement even when the clutch knobs are fully loosened.  In my case it takes between 10# and 15# of pull measured with an electronic fish scale to break the friction and get the mount to move in either RA or Dec.  I try to balance the mount by checking the pull needed in both directions and getting them as close to equal as possible.  But getting a precise balance is impossible.  That is why I asked if AP was going to offer an upgraded quick release worm mechanism like they have on the current AP1600 mounts.  Quickly releasing the worm from the worm gear allows for easy and precise balancing.

Jack Huerkamp


Re: Quick Release Gearbox Modification for Older AP1600

W Hilmo
 

I’ve not heard of a procedure for lubricating the clutches on these mounts.

 

Do you have a pointer to instructions?  My AP1600 declination clutch is pretty stiff, and has been since day one, but it’s nothing that’s a problem to work with.  I’m mainly just curious.

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Woody Schlom
Sent: Tuesday, March 9, 2021 12:49 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Quick Release Gearbox Modification for Older AP1600

 

Jack,

 

That does seem like a lot of friction.  I’m not sure about the AP1600’s clutch mechanism, but I suspect my old Mach1 is similar.  And in that case, the clutch system can be lubricated independently of the drive gear system.  And it’s a lot easier too.

 

Another suggestion.  You mention the electronic fish scale balancing system (which is my preference) for balancing.  But have you tried the motor current load method to see how well that might work for you?  I’m pretty sure you already have a PowerWerx voltage/current meter.  So you can try that method and see if it works any better for you.  When slewing (I used slow slew speeds) the motor current load should be the same in both directions.

 

But I’d start with re-greasing the clutch system first.  And so far as I understand it, that doesn’t require the fancy greases that come in the AP grease kit.  In fact, I wouldn’t be surprised if the clutch parts do better with a different kind of grease.  I believe I used a SuperLube synthetic grease for my clutch bearings.

 

I know that when I re-greased the clutch bearing system in my Mach1, it made a lot of difference.

 

Woody

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Jack Huerkamp
Sent: Tuesday, March 9, 2021 7:45 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Quick Release Gearbox Modification for Older AP1600

 

JimP, granted the AP1600 offers resistance to movement even when the clutch knobs are fully loosened.  In my case it takes between 10# and 15# of pull measured with an electronic fish scale to break the friction and get the mount to move in either RA or Dec.  I try to balance the mount by checking the pull needed in both directions and getting them as close to equal as possible.  But getting a precise balance is impossible.  That is why I asked if AP was going to offer an upgraded quick release worm mechanism like they have on the current AP1600 mounts.  Quickly releasing the worm from the worm gear allows for easy and precise balancing.

Jack Huerkamp


VIDEO - Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount

Harley Davidson
 

I ended up "modifying" an Astro-Physics DOVEKREP so it would work with the 1600GTO Mount.

Modifying an Astro-Physics DOVEKREP to fit a 1600GTO Mount
https://www.youtube.com/watch?v=ULDkyZh4GqM


tony


Re: Quick Release Gearbox Modification for Older AP1600

Woody Schlom
 

Jack,

 

That does seem like a lot of friction.  I’m not sure about the AP1600’s clutch mechanism, but I suspect my old Mach1 is similar.  And in that case, the clutch system can be lubricated independently of the drive gear system.  And it’s a lot easier too.

 

Another suggestion.  You mention the electronic fish scale balancing system (which is my preference) for balancing.  But have you tried the motor current load method to see how well that might work for you?  I’m pretty sure you already have a PowerWerx voltage/current meter.  So you can try that method and see if it works any better for you.  When slewing (I used slow slew speeds) the motor current load should be the same in both directions.

 

But I’d start with re-greasing the clutch system first.  And so far as I understand it, that doesn’t require the fancy greases that come in the AP grease kit.  In fact, I wouldn’t be surprised if the clutch parts do better with a different kind of grease.  I believe I used a SuperLube synthetic grease for my clutch bearings.

 

I know that when I re-greased the clutch bearing system in my Mach1, it made a lot of difference.

 

Woody

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Jack Huerkamp
Sent: Tuesday, March 9, 2021 7:45 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Quick Release Gearbox Modification for Older AP1600

 

JimP, granted the AP1600 offers resistance to movement even when the clutch knobs are fully loosened.  In my case it takes between 10# and 15# of pull measured with an electronic fish scale to break the friction and get the mount to move in either RA or Dec.  I try to balance the mount by checking the pull needed in both directions and getting them as close to equal as possible.  But getting a precise balance is impossible.  That is why I asked if AP was going to offer an upgraded quick release worm mechanism like they have on the current AP1600 mounts.  Quickly releasing the worm from the worm gear allows for easy and precise balancing.

Jack Huerkamp


Re: How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Bill Long
 

Not sure what the procedure is on a Mach 1, but the only mistake I made was having the motor box cover slip out from my grip and the black lead on the motor popped off. Totally avoidable problem. The rest was gravy and pretty easy.


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Fernando Proietti <fernandoaproietti@...>
Sent: Tuesday, March 9, 2021 11:33 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?
 
+1 for a video. I have a Mach1. I am outside the US and I am not mechanically wise or inspired to risk damaging the mouny. If repair is needed, it will be quite expensive to send the mount to AP and back. That is my reason asking for a video.

Regards, Fernando


Em seg., 8 de mar. de 2021 às 12:33, Cheng-Yang Tan via groups.io <cytan299=yahoo.com@groups.io> escreveu:
Definitely a video!

cytan

On Monday, March 8, 2021, 09:30:21 AM CST, Andrew Jones <andjones132@...> wrote:


Hi Bill.

Thank you for sharing your experience. I know you to be a very knowledgeable amateur astronomer based on your many useful and helpful post on the forum. If someone with your level expertise struggled with this re-greasing process the first time, to point of actually damaging the mount, does not give me warm and fuzzys about attempting the process myself. Given the recommendation that all owners of AP mounts should be performing this maintenance ever 2 - 5 years would indicate a strong demand for clear and concise instructions for each mount. I am sure we could all call George and have him walk us through the process step by step, but it would seem easier (for AP) if we could just get a step-by-step guide or even better a YouTube Video showing each step in detail. I am going to hold off with re-greasing my Mach1 from 2016 for now until hopefully some better instructions come along. 

Thanks again for sharing your experience. 

Andrew J


Re: How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Fernando Proietti
 

+1 for a video. I have a Mach1. I am outside the US and I am not mechanically wise or inspired to risk damaging the mouny. If repair is needed, it will be quite expensive to send the mount to AP and back. That is my reason asking for a video.

Regards, Fernando


Em seg., 8 de mar. de 2021 às 12:33, Cheng-Yang Tan via groups.io <cytan299=yahoo.com@groups.io> escreveu:

Definitely a video!

cytan

On Monday, March 8, 2021, 09:30:21 AM CST, Andrew Jones <andjones132@...> wrote:


Hi Bill.

Thank you for sharing your experience. I know you to be a very knowledgeable amateur astronomer based on your many useful and helpful post on the forum. If someone with your level expertise struggled with this re-greasing process the first time, to point of actually damaging the mount, does not give me warm and fuzzys about attempting the process myself. Given the recommendation that all owners of AP mounts should be performing this maintenance ever 2 - 5 years would indicate a strong demand for clear and concise instructions for each mount. I am sure we could all call George and have him walk us through the process step by step, but it would seem easier (for AP) if we could just get a step-by-step guide or even better a YouTube Video showing each step in detail. I am going to hold off with re-greasing my Mach1 from 2016 for now until hopefully some better instructions come along. 

Thanks again for sharing your experience. 

Andrew J

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