Date   

Re: Spikes in DEC #guiding #Guiding

Seb@stro
 

Thanks for your analysis Brian. 

What you see there is due to serious wind gusts present at the beginning of the run. I even had to remove the dew shield to help with that... But by 11:15-11:30PM, wind had entirely stopped. 

It's more with the spikes that I am concerned. By the time I saw them, conditions had greatly improved (no wind, 60% RH, -1 Celsius) compared to the beginning of the session.

At any rate, sincere thanks for chiming in. I'll see what AP thinks about that tomorrow (well, later today 🙂).

Clear skies,
Sebastien

De : main@ap-gto.groups.io <main@ap-gto.groups.io> de la part de Brian Valente <bvalente@...>
Envoyé : 3 mai 2021 03:03
À : main@ap-gto.groups.io <main@ap-gto.groups.io>
Objet : Re: [ap-gto] Spikes in DEC #guiding #guiding
 
PS

i just found your PA run sorry i missed that

the DEC is a little bit concerning here. this is without any motor running and 3 second exposures, and yet the DEC looks remarkably uneven, especially with encoders (compare this to your RA in blue)
image.png



Re: Spikes in DEC #guiding #Guiding

 

PS

i just found your PA run sorry i missed that

the DEC is a little bit concerning here. this is without any motor running and 3 second exposures, and yet the DEC looks remarkably uneven, especially with encoders (compare this to your RA in blue)
image.png


On Sun, May 2, 2021 at 10:29 PM Seb@stro <sebastiendore1@...> wrote:
Hi Brian,

Thanks for your reply.  Logs here: https://openphdguiding.org/logs/dl/PHD2_logs_BqZp.zip

I should probably have added that my imaging scale is 1.04"/px. So it's probably impacting a bit, maybe not much... But to be honest my concern was also about the working order the mount.  

But don't get me wrong, I'm coming from a low budget asian mount and got the Mach2 about 2 months ago. It performs WAAAAAAAAYYYYYYYYYYYYYYY better, no question there. So there's the fact that I'm not very familiar with AP mounts limits regarding tracking and guiding yet. Had a handful of clear nights only. And I know my system is the challenging kind (mirrors, long FL, reducer backfocus, etc.)... So I just thought I'd ask for educated guess here.

Might also be PA as you pointed out. But I thought I did well since I polar aligned with RAPAS at the beginning of my session and refined with PHD2 polar drift align afterward. When I ran the Guiding assistant, I recall it was saying it was around 2-3 arcmin from the NCP... Do you think it's reasonable for my imaging scale (1"/px) ?

Sebastien


De : main@ap-gto.groups.io <main@ap-gto.groups.io> de la part de Brian Valente <bvalente@...>
Envoyé : 3 mai 2021 00:48
À : main@ap-gto.groups.io <main@ap-gto.groups.io>
Objet : Re: [ap-gto] Spikes in DEC #guiding #guiding
 
Hi  Sebastien

Please upload your guidelogs for this https://openphdguiding.org/getting-help/ 


Screen caps aren't enough information, but a quick glance looks like you have pretty bad polar alignment which would dramatically impact your DEC guiding

guidelogs would tell more


I wonder how much of an issue guiding is here - your overall rms is 0.49" and your image scale is 1.7"/pix, i'm guessing even if you addressed this you may not see a difference in your images


Brian
 

On Sun, May 2, 2021 at 9:44 PM Seb@stro <sebastiendore1@...> wrote:
Hello all, 

I'm having some spikes in my DEC guiding at times tonight. The worst ones seem to occur at periodic interval around 20-25 seconds but not all the time. Like about a dozen times in 400s periods. RMS values are good but DEC is about 40% bigger than RA because of these excursions. 

Conditions are fairly good now. No wind at all. Balance was quite accurate (as far as my eye can tell) in both RA and DEC. PA error reported by PHD2 is below 5 arc-min. I have a NUC on top of OTA, so no cable snag possible. Seeing is fair at 3.5-4".

My setup:
-EdgeHD 800 reduced to 1400mm FL
-Guide cam pixel scale : 1.7"/px
-Guiding through OAG at 3-4 seconds interval

Imaging M106 which is about 2hrs past meridian at the time of writing this.

That said, I'm not that familiar with guiding at such focal length... Any thoughts on what might be causing this ?

Sebastien



--
Brian 



Brian Valente



--
Brian 



Brian Valente


Re: Spikes in DEC #guiding #Guiding

 

HI Sebastian

I suggest you take this up with AP in their forums

encoder mounts like the Mach 2 require some basic correct setup, and i'm not sure yours is there (i'm not suggesting there's anything wrong with the mount at all: you are guiding < 0.50")

 looking at a typical run, your DEC is odd for the following reasons: 
- those excursions are not the result of any PHD type of correction
- all your corrections are in one direction both RA and DEC, and corrections exhibit a clumping 

this is dec showing the large instantaneous jumps and guiding in only one direction 
image.png

image.png

I suggest you do a guiding assistant run for a few minutes to measure polar misalignment. it could be something is terribly off on polar align, but based on what you're saying i don't know. 



On Sun, May 2, 2021 at 10:29 PM Seb@stro <sebastiendore1@...> wrote:
Hi Brian,

Thanks for your reply.  Logs here: https://openphdguiding.org/logs/dl/PHD2_logs_BqZp.zip

I should probably have added that my imaging scale is 1.04"/px. So it's probably impacting a bit, maybe not much... But to be honest my concern was also about the working order the mount.  

But don't get me wrong, I'm coming from a low budget asian mount and got the Mach2 about 2 months ago. It performs WAAAAAAAAYYYYYYYYYYYYYYY better, no question there. So there's the fact that I'm not very familiar with AP mounts limits regarding tracking and guiding yet. Had a handful of clear nights only. And I know my system is the challenging kind (mirrors, long FL, reducer backfocus, etc.)... So I just thought I'd ask for educated guess here.

Might also be PA as you pointed out. But I thought I did well since I polar aligned with RAPAS at the beginning of my session and refined with PHD2 polar drift align afterward. When I ran the Guiding assistant, I recall it was saying it was around 2-3 arcmin from the NCP... Do you think it's reasonable for my imaging scale (1"/px) ?

Sebastien


De : main@ap-gto.groups.io <main@ap-gto.groups.io> de la part de Brian Valente <bvalente@...>
Envoyé : 3 mai 2021 00:48
À : main@ap-gto.groups.io <main@ap-gto.groups.io>
Objet : Re: [ap-gto] Spikes in DEC #guiding #guiding
 
Hi  Sebastien

Please upload your guidelogs for this https://openphdguiding.org/getting-help/ 


Screen caps aren't enough information, but a quick glance looks like you have pretty bad polar alignment which would dramatically impact your DEC guiding

guidelogs would tell more


I wonder how much of an issue guiding is here - your overall rms is 0.49" and your image scale is 1.7"/pix, i'm guessing even if you addressed this you may not see a difference in your images


Brian
 

On Sun, May 2, 2021 at 9:44 PM Seb@stro <sebastiendore1@...> wrote:
Hello all, 

I'm having some spikes in my DEC guiding at times tonight. The worst ones seem to occur at periodic interval around 20-25 seconds but not all the time. Like about a dozen times in 400s periods. RMS values are good but DEC is about 40% bigger than RA because of these excursions. 

Conditions are fairly good now. No wind at all. Balance was quite accurate (as far as my eye can tell) in both RA and DEC. PA error reported by PHD2 is below 5 arc-min. I have a NUC on top of OTA, so no cable snag possible. Seeing is fair at 3.5-4".

My setup:
-EdgeHD 800 reduced to 1400mm FL
-Guide cam pixel scale : 1.7"/px
-Guiding through OAG at 3-4 seconds interval

Imaging M106 which is about 2hrs past meridian at the time of writing this.

That said, I'm not that familiar with guiding at such focal length... Any thoughts on what might be causing this ?

Sebastien



--
Brian 



Brian Valente



--
Brian 



Brian Valente


Re: Spikes in DEC #Guiding

Seb@stro
 

I seem to have some very consistant spikes (about 3" in magnitude) every 130 seconds now. I have monitored for about 20 minutes long and they are very predictable... Note that I have reduced exposure time to 2.0s, just to see if I would see more spikes when sampling faster.



Re: Spikes in DEC #guiding #Guiding

Seb@stro
 

Hi Brian,

Thanks for your reply.  Logs here: https://openphdguiding.org/logs/dl/PHD2_logs_BqZp.zip

I should probably have added that my imaging scale is 1.04"/px. So it's probably impacting a bit, maybe not much... But to be honest my concern was also about the working order the mount.  

But don't get me wrong, I'm coming from a low budget asian mount and got the Mach2 about 2 months ago. It performs WAAAAAAAAYYYYYYYYYYYYYYY better, no question there. So there's the fact that I'm not very familiar with AP mounts limits regarding tracking and guiding yet. Had a handful of clear nights only. And I know my system is the challenging kind (mirrors, long FL, reducer backfocus, etc.)... So I just thought I'd ask for educated guess here.

Might also be PA as you pointed out. But I thought I did well since I polar aligned with RAPAS at the beginning of my session and refined with PHD2 polar drift align afterward. When I ran the Guiding assistant, I recall it was saying it was around 2-3 arcmin from the NCP... Do you think it's reasonable for my imaging scale (1"/px) ?

Sebastien


De : main@ap-gto.groups.io <main@ap-gto.groups.io> de la part de Brian Valente <bvalente@...>
Envoyé : 3 mai 2021 00:48
À : main@ap-gto.groups.io <main@ap-gto.groups.io>
Objet : Re: [ap-gto] Spikes in DEC #guiding #guiding
 
Hi  Sebastien

Please upload your guidelogs for this https://openphdguiding.org/getting-help/ 


Screen caps aren't enough information, but a quick glance looks like you have pretty bad polar alignment which would dramatically impact your DEC guiding

guidelogs would tell more


I wonder how much of an issue guiding is here - your overall rms is 0.49" and your image scale is 1.7"/pix, i'm guessing even if you addressed this you may not see a difference in your images


Brian
 

On Sun, May 2, 2021 at 9:44 PM Seb@stro <sebastiendore1@...> wrote:
Hello all, 

I'm having some spikes in my DEC guiding at times tonight. The worst ones seem to occur at periodic interval around 20-25 seconds but not all the time. Like about a dozen times in 400s periods. RMS values are good but DEC is about 40% bigger than RA because of these excursions. 

Conditions are fairly good now. No wind at all. Balance was quite accurate (as far as my eye can tell) in both RA and DEC. PA error reported by PHD2 is below 5 arc-min. I have a NUC on top of OTA, so no cable snag possible. Seeing is fair at 3.5-4".

My setup:
-EdgeHD 800 reduced to 1400mm FL
-Guide cam pixel scale : 1.7"/px
-Guiding through OAG at 3-4 seconds interval

Imaging M106 which is about 2hrs past meridian at the time of writing this.

That said, I'm not that familiar with guiding at such focal length... Any thoughts on what might be causing this ?

Sebastien



--
Brian 



Brian Valente


Re: Spikes in DEC #guiding #Guiding

 

Hi  Sebastien

Please upload your guidelogs for this https://openphdguiding.org/getting-help/ 


Screen caps aren't enough information, but a quick glance looks like you have pretty bad polar alignment which would dramatically impact your DEC guiding

guidelogs would tell more


I wonder how much of an issue guiding is here - your overall rms is 0.49" and your image scale is 1.7"/pix, i'm guessing even if you addressed this you may not see a difference in your images


Brian
 

On Sun, May 2, 2021 at 9:44 PM Seb@stro <sebastiendore1@...> wrote:
Hello all, 

I'm having some spikes in my DEC guiding at times tonight. The worst ones seem to occur at periodic interval around 20-25 seconds but not all the time. Like about a dozen times in 400s periods. RMS values are good but DEC is about 40% bigger than RA because of these excursions. 

Conditions are fairly good now. No wind at all. Balance was quite accurate (as far as my eye can tell) in both RA and DEC. PA error reported by PHD2 is below 5 arc-min. I have a NUC on top of OTA, so no cable snag possible. Seeing is fair at 3.5-4".

My setup:
-EdgeHD 800 reduced to 1400mm FL
-Guide cam pixel scale : 1.7"/px
-Guiding through OAG at 3-4 seconds interval

Imaging M106 which is about 2hrs past meridian at the time of writing this.

That said, I'm not that familiar with guiding at such focal length... Any thoughts on what might be causing this ?

Sebastien



--
Brian 



Brian Valente


Spikes in DEC #guiding #Guiding

Seb@stro
 

Hello all, 

I'm having some spikes in my DEC guiding at times tonight. The worst ones seem to occur at periodic interval around 20-25 seconds but not all the time. Like about a dozen times in 400s periods. RMS values are good but DEC is about 40% bigger than RA because of these excursions. 

Conditions are fairly good now. No wind at all. Balance was quite accurate (as far as my eye can tell) in both RA and DEC. PA error reported by PHD2 is below 5 arc-min. I have a NUC on top of OTA, so no cable snag possible. Seeing is fair at 3.5-4".

My setup:
-EdgeHD 800 reduced to 1400mm FL
-Guide cam pixel scale : 1.7"/px
-Guiding through OAG at 3-4 seconds interval

Imaging M106 which is about 2hrs past meridian at the time of writing this.

That said, I'm not that familiar with guiding at such focal length... Any thoughts on what might be causing this ?

Sebastien


Re: AP1100 loading heavy scope at 60 inch pier height

weems@...
 

Like Len, I point my 6”f9 at the floor and support it. But I take the counter weights off before I release the dovetail. The mount can hold the empty shaft in place when the scope comes off. The early AP rings are not hinged, so the scope would need to be held in place in park 2 while fumbling with a pair of cap screws for each ring.

Chip


Re: Small AP Mount Ideas

weihaowang
 

Soon we will challenge our Mach2 with a CFF 12" RC.
I think it will work well.

--

Homepage:

http://www.asiaa.sinica.edu.tw/~whwang/

Astrobin gallery:
http://www.astrobin.com/users/whwang/


Re: AP1100 loading heavy scope at 60 inch pier height

Harley Davidson
 

Mike

If the table doesn't get high enough a wooden extension could be added to the table. Also, they make a smaller 500 lb lift table. My 1000 lb unit has worked flawlessly.

tony

On 5/1/2021 3:18 PM, M Hambrick wrote:
Tony (a.k.a. Harley Davidson) made one of his famous YouTube videos for a lift table that he got from Harbor Freight. Here is a link to it:

Mike

Hydraulic Table Cart item 60438 from Harbor Freight 1000 lb capacity - YouTube


Re: Continuation of the discussion using APCC CW up within the East Limit slews with SGPro #APCC

Manusfisch
 

Luca, thank you for that logical and brilliant explanation of the interplay

TJF Mobile

On May 1, 2021, at 10:46, Luca Marinelli <photo@...> wrote:



Hi Eric,

 

I responded to your thread in the SGP forum and shared my configuration in APCC and SGP, which allows CW up imaging and pre-flipping of the mount, if you desire. I have worked out an example and hopefully this will be clearer.

 

I image unattended and my goal is always to have a belt and suspenders system with redundancy so using “Just Warn” in the meridian limit tab of APCC is out of the question for me. I am never next to the mount and I regard APCC meridian limits as a safety in case anything goes wrong with the imaging run or control of the meridian flip. I use “Stop Tracking” when the meridian limit is reached so the mount cannot track past this point and I have a visual indication that something went wrong in the morning when I shut everything down.

 

SGP controls the meridian flip. SGP is controlling all imaging equipment and knows when is a good time to take a break and flip the mount. As Ray said, all APCC needs to do, is tell SGP at what time it can start flipping the mount. SGP will request a flip as soon after this time as is compatible with the imaging run. This is what is accomplished with the “Flip Offset” entry and “Send Limit with offset to SGPro” checkbox in the meridian limit tab in APCC.

 

With the camera I use on this system, at most I take 10 minute frames, so I chose 20 minutes as Flip Offset. I will always have time to complete a frame before hitting the meridian limit (where the mount would stop tracking and the imaging run abort) with this choice of Flip Offset.

 

So let’s look at an example. It’s 10am here and M31 is in the Eastern sky, just before the meridian, at a declination that is compatible with CW up imaging on my system, so I picked this target and created a sequence in SGP. I ran two scenarios: one with CW Up Slews within East Limits checked and one without checking the box.

 

Conventional imaging with only West Limits checked (safety limit):

 

Take a look at the screenshot. Meridian flip is controlled by SGP and APCC is setup to pass the meridian limit with flip offset to SGP. If you compare the timer until meridian flip in APCC (2h 38m 11s) with the timer in SGP (2h 19m 36s) – circled in blue in the screenshot – you’ll see that the difference between the two is exactly the Flip Offset: SGP will request a meridian flip as soon as possible after the timer runs out and it will have 20 minutes before the mount bumps into the actual meridian safety limit set in APCC.

 

This is my usual mode of imaging. I image multiple targets during the night to make efficient use of dark hours and this mode is safe, works, and is efficient. I launched the sequence in SGP and you can see in the 3D View that the mount is CW down, West pointing East, in a conventional position. APCC has passed the time to flip to SGP and in Meridian Flip Options you see 80 minutes past meridian to flip. That number is set dynamically by SGP based on the information about the meridian with flip offset passed along by APCC. You don’t change this number manually. Try changing the Flip Offset and you will see that this number and the timer at the bottom of the SGP window update automatically.

 

CW up imaging using East Limits checked (opportunity limit):

 

The same target M31 is within the East meridian limits and so I can also choose to start imaging with CW up and pre-flip the mount. All I need to do is check the East Limits checkbox in the meridian limit tab in APCC and everything else stays the same. The advantage of this setup is: 1) APCC still acts as the ultimate safety limit – if everything else fails and the mount reaches the meridian limit, the mount will stop tracking. 2) If you have multiple targets in your SGP run and some start the imaging run within East limits, some don’t, the ones that allow a start with CW up will use that configuration, the ones that don’t will start in a standard CW down position. I have used this mode of operation unattended without any adverse consequences.

 

When I start the imaging run, you can see that the Scope timer in SGP says N/A because no flip will be requested during this run. In the 3D View you can see that the scope is starting the imaging run CW up, because it is possible. Easy peasy.

 

That’s about it. It’s really not that complicated if you use two guiding principles: 1) the imaging application requests meridian flips because it knows when it can do it without interrupting other operations, 2) APCC is responsible for the safety of the gear.

 

Cheers,

 

Luca

 


Re: AP1100 loading heavy scope at 60 inch pier height

Bruce Donzanti
 

I have the Pier Tech Pier 3 in my ROR with my AP1100 on it. It is on a cement pier over 20” high and is very stable.  Definitely check it out.  You can see some of my observatory images here:  https://www.astrobin.com/users/umasscrew39/collections/1257/




On May 1, 2021, at 6:03 PM, Shailesh Trivedi <strivedi@...> wrote:

@dvjbaja I am leaning towards redoing my concrete pad, removing my Paramount MX pier (48 inch + 12 inch concrete pedestal) and buy a Pier Tech pier which may pave a path for their ROR. They look better than any I have seen thus far, though by far the most expensive but in my opinion, the best fit for my backyard - but that is for the future. For now I have pretty much decided to go the Pier Tech route. They have a top plate that has hole patterns for 119FSA for my AP1100 and ADATRI for my soon to come Mach2. Pier Tech's Pier3 can hold up to a AP3600 (I do not have one) and working height is 34 inches to 54 inches above concrete pad. This will be tremendously helpful to load my TEC 180FL in AP Park 2 like George and Rolando have recommended.

@Mike - I watched the video, that hydraulic table is very nice, also like his Chihuahua, Moose.

Thanks to everyone, please keep up the mindshare, maybe there is something better out there still. Great group of helpful folks. Cheers!

Shailesh


Re: AP1100 loading heavy scope at 60 inch pier height

Shailesh Trivedi
 

@dvjbaja I am leaning towards redoing my concrete pad, removing my Paramount MX pier (48 inch + 12 inch concrete pedestal) and buy a Pier Tech pier which may pave a path for their ROR. They look better than any I have seen thus far, though by far the most expensive but in my opinion, the best fit for my backyard - but that is for the future. For now I have pretty much decided to go the Pier Tech route. They have a top plate that has hole patterns for 119FSA for my AP1100 and ADATRI for my soon to come Mach2. Pier Tech's Pier3 can hold up to a AP3600 (I do not have one) and working height is 34 inches to 54 inches above concrete pad. This will be tremendously helpful to load my TEC 180FL in AP Park 2 like George and Rolando have recommended.

@Mike - I watched the video, that hydraulic table is very nice, also like his Chihuahua, Moose.

Thanks to everyone, please keep up the mindshare, maybe there is something better out there still. Great group of helpful folks. Cheers!

Shailesh


Re: [EXT] Re: [ap-gto] AP1200 regrease and maintenance

Sabino Ramirez
 

Many thanks Dog , I will try to carry out the instructions in the video AP1200 GTO Regrease Project

Again thank you

 

Sabino

 

 

 

De: main@ap-gto.groups.io <main@ap-gto.groups.io> En nombre de Don Anderson via groups.io
Enviado el: sábado, 1 de mayo de 2021 17:07
Para: main@ap-gto.groups.io
Asunto: [EXT] Re: [ap-gto] AP1200 regrease and maintenance

 

Sabino

Attached is a link to a Utube video on the regreasing of a 1200 mount that I sent to Linton. Hope you find it useful as well.

(2) AP1200GTO Regrease Project - YouTube

 

 


AP1200GTO Regrease Project

 

 

 

 

Don Anderson

 

 

On Saturday, May 1, 2021, 08:55:06 a.m. MDT, Sabino Ramirez <sabino.ramirez@...> wrote:

 

 

Hi George ,

My name is Sabino Ramirez and I am from Chile, I have been looking at the group's emails and one of Linton Guise caught my attention, I have an AP1200 the same and I would like to perform a re-greasing, could you share the PDF of how to do it to my email please.

I will appreciate your help in this

 

Best regards

Sabino

My email sabino.ramirez@...

 

De: main@ap-gto.groups.io <main@ap-gto.groups.io> En nombre de George
Enviado el: viernes, 30 de abril de 2021 12:35
Para: main@ap-gto.groups.io
Asunto: [EXT] Re: [ap-gto] AP1200 regrease and maintenance

 

Linton,

 

Shoot me an email and I can send you a PDF.

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Linton Guise
Sent: Friday, April 30, 2021 11:26 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] AP1200 regrease and maintenance

 

Hi,
My AP1200 is a few years old now but still functions perfectly. I’m sure it’s overdue for a regrease etc. Could someone direct me to any help files on how to go about this. Had a quick search but came up blank. I’m sure there must be a good guide out there.

Many thanks,

Linton Guise (Bedford U.K.)

The material contained in this email is confidential and may be subject to legal professional privilege and/or copyright. Please do not re-transmit, distribute, copy or commercialise any of the material in this message unless you are authorised to do so. If you are not the intended recipient, use, disclosure or copying of this information is prohibited. If you have received this document in error, please advise the sender and delete the document. None of Molycop, its related bodies corporate or the sender accept responsibility for any viruses contained in this email or any attachments. All and any rights as to confidentiality, legal professional privilege and copyright are expressly reserved.

The material contained in this email is confidential and may be subject to legal professional privilege and/or copyright. Please do not re-transmit, distribute, copy or commercialise any of the material in this message unless you are authorised to do so. If you are not the intended recipient, use, disclosure or copying of this information is prohibited. If you have received this document in error, please advise the sender and delete the document. None of Molycop, its related bodies corporate or the sender accept responsibility for any viruses contained in this email or any attachments. All and any rights as to confidentiality, legal professional privilege and copyright are expressly reserved.


Re: AP1200 regrease and maintenance

Don Anderson
 

Sabino
Attached is a link to a Utube video on the regreasing of a 1200 mount that I sent to Linton. Hope you find it useful as well.

Don Anderson


On Saturday, May 1, 2021, 08:55:06 a.m. MDT, Sabino Ramirez <sabino.ramirez@...> wrote:


Hi George ,

My name is Sabino Ramirez and I am from Chile, I have been looking at the group's emails and one of Linton Guise caught my attention, I have an AP1200 the same and I would like to perform a re-greasing, could you share the PDF of how to do it to my email please.

I will appreciate your help in this

 

Best regards

Sabino

My email sabino.ramirez@...

 

De: main@ap-gto.groups.io <main@ap-gto.groups.io> En nombre de George
Enviado el: viernes, 30 de abril de 2021 12:35
Para: main@ap-gto.groups.io
Asunto: [EXT] Re: [ap-gto] AP1200 regrease and maintenance

 

Linton,

 

Shoot me an email and I can send you a PDF.

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Linton Guise
Sent: Friday, April 30, 2021 11:26 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] AP1200 regrease and maintenance

 

Hi,
My AP1200 is a few years old now but still functions perfectly. I’m sure it’s overdue for a regrease etc. Could someone direct me to any help files on how to go about this. Had a quick search but came up blank. I’m sure there must be a good guide out there.

Many thanks,

Linton Guise (Bedford U.K.)

The material contained in this email is confidential and may be subject to legal professional privilege and/or copyright. Please do not re-transmit, distribute, copy or commercialise any of the material in this message unless you are authorised to do so. If you are not the intended recipient, use, disclosure or copying of this information is prohibited. If you have received this document in error, please advise the sender and delete the document. None of Molycop, its related bodies corporate or the sender accept responsibility for any viruses contained in this email or any attachments. All and any rights as to confidentiality, legal professional privilege and copyright are expressly reserved.


Re: AP1100 loading heavy scope at 60 inch pier height

M Hambrick
 

Tony (a.k.a. Harley Davidson) made one of his famous YouTube videos for a lift table that he got from Harbor Freight. Here is a link to it:

Mike

Hydraulic Table Cart item 60438 from Harbor Freight 1000 lb capacity - YouTube


Re: AP1100 loading heavy scope at 60 inch pier height

dvjbaja
 

If I had a permanent spot, I'd go immediately for one of those Pier-Tech adjustable piers.  The new models look very robust and the flexibility of eye position would be excellent.  Alas, I am stuck lifting my 180 f/7 to the top of a 48" height on the 1100 and Losmandy tripod.  Not too bad, but over the years, I have indeed noticed how the 180 has gained weight.   So it does not get used and sits in storage. A refuge for spiders.   I dont' have such problems with the 10" Mak-cass.  It's much easier and lighter to handle, and honestly a superior observing experience.  Good luck and clear sky. 


On Sat, May 1, 2021 at 11:12 AM Shailesh Trivedi <strivedi@...> wrote:
@Christian thanks for the link

@dvjbaja I have been using my wife for the lift up on a Parmount MX which I no longer have. The PMX has a RA/DEC lock mechanism so I can lock it with CWs sideways and mount it with the saddle. The AP mounts do not have such a lock and I must either use Park2 or 3 with CWs down. I have been agonizing over getting my pier and concrete torn up to get an adjustable pier to help. 

Thanks for the continuing mind share.

Shailesh


Re: AP1100 loading heavy scope at 60 inch pier height

Shailesh Trivedi
 

@Christian thanks for the link

@dvjbaja I have been using my wife for the lift up on a Parmount MX which I no longer have. The PMX has a RA/DEC lock mechanism so I can lock it with CWs sideways and mount it with the saddle. The AP mounts do not have such a lock and I must either use Park2 or 3 with CWs down. I have been agonizing over getting my pier and concrete torn up to get an adjustable pier to help. 

Thanks for the continuing mind share.

Shailesh


Re: Continuation of the discussion using APCC CW up within the East Limit slews with SGPro #APCC

Ray Gralak
 

Eric,

 

> How does APCC dynamic meridian delay work? 

 

It is “dynamic” because the meridian delay can automatically change when declination changes. I'm going to copy a paragraph out of the APCC help, which you can find at this link:

 

https://www.siriusimaging.com/Help/APCC/index.html?meridian_tab.htm

 

Instead of just a single meridian limit for all declinations, you can configure an arbitrary number of different limits at different declinations. This is useful because at each declination there can be a different hour angle at which the telescope will touch the pier.  In declination regions where the telescope can theoretically go the full 6 hours past in the west, the meridian limits can establish horizon tracking limits for the practical distance past the meridian where you can reasonably continue to work.  Likewise, in the east, they can set the practical horizon ahead of the meridian where you can reasonably start an image.

 

To configure the dynamic meridian delay values you use APCC’s Meridian Limit Explorer (perhaps in the daytime) to map the counterweight-up limits of your specific scope on your mount. The limits (meridian delays) will be different depending on the scope and the latitude of the site. Once you do it once, you will see that it is pretty easy to use. Here are three different links explaining the operation in more detail:

 

https://www.siriusimaging.com/Help/APCC/meridian_limits_explorer.htm

 

https://www.siriusimaging.com/Help/APCC/using_the_meridian_tracking_li.htm

 

https://www.siriusimaging.com/Help/APCC/add_meridian_limit_tracking_po.htm

 

After defining the limits, when using APCC with SGPro, APCC will be able to automatically use the pre-defined limit for the mount’s current declination and pier side.

 

I hope this information helps to explain what “dynamic meridian delay” means.

 

-Ray

 


Re: AP1100 loading heavy scope at 60 inch pier height

dvjbaja
 

Why not get a friend or that special someone in your life to help you lift the tube assembly?  Or even better, buy one of those motorized, height adjustable piers and skip the friend entirely.  ???


On Sat, May 1, 2021 at 9:31 AM christian viladrich <christian.viladrich@...> wrote:

Hi,

I don't know whether it could be of any use for you guys, here is something used for motorcycles.

The link is in French, but you can probably figure out how it works. Maximum height of the platform in 900 mm :

https://www.manomano.fr/p/table-elevatrice-hydraulique-moto-capacite-135-kg-s15344-5453476

Christian

Le 01/05/2021 à 14:39, M Hambrick a écrit :
Hi Shailesh

I live at 30 Deg North latitude and can confirm that there is no risk of the scope rolling out of the rings when I set it into the open rings in Park 2. I expect that this is also the case at even lower latitudes. Next time I set up my mount I may try some different latitude settings to see what the limit really is. 

FYI I have a 180 EDT with an 1100 mount on a 54" Astro-Physics portable pier. My setup is portable and I set it up and take it down every time. I agree that using a step ladder to get the scope up to the rings is a pretty dicey operation. I bought the folding step stool with hand rails shown below from McMaster (Model 9754T77) that has made this operation much easier. 

If you don't mount and dismount your scope very often, Len's method sounds pretty good too.

Do you have a permanent observatory ? If so, I wonder if it is possible to install some kind of lifting apparatus in the roof. 

Mike

2901 - 2920 of 81140