Date   

Re: ... and daytime polar alignment

Tyrel Smith
 

Copy all, Mike. Thanks for the explanation.

Ty Smith

On Apr 21, 2019, at 17:29, Mike Dodd mike@... [ap-gto] <ap-gto@...> wrote:

 

On 4/21/2019 2:53 PM, Tyrel Smith tysmith747@... [ap-gto] wrote:

> I guess I just don’t understand the need for a level....

I use a level only to re-establish the Park 1 position after loosening
the clutches to balance the mount. Oh, and also for the initial setup on
a concrete pier in a new observatory.

Regarding the "need" for a high-precision level, for me, it was a matter
of personal preference. I like to be sure I start from a position that's
fairly accurate, and I didn't mind spending the money for a level that
helps me achieve this.

I certainly acknowledge that other methods and instruments can and do
work well, and I applaud those who get good results without
high-precision tools.

--- Mike


Re: ... and daytime polar alignment

Mike Dodd
 

On 4/21/2019 2:53 PM, Tyrel Smith tysmith747@gmail.com [ap-gto] wrote:

I guess I just don’t understand the need for a level....
I use a level only to re-establish the Park 1 position after loosening the clutches to balance the mount. Oh, and also for the initial setup on a concrete pier in a new observatory.

Regarding the "need" for a high-precision level, for me, it was a matter of personal preference. I like to be sure I start from a position that's fairly accurate, and I didn't mind spending the money for a level that helps me achieve this.

I certainly acknowledge that other methods and instruments can and do work well, and I applaud those who get good results without high-precision tools.

--- Mike


Re: ... and daytime polar alignment

Mike Dodd
 

On 4/21/2019 1:16 PM, 'Joseph Zeglinski' J.Zeglinski@rogers.com [ap-gto] wrote:


Mike,
Have a look at my DYI Bubble Level in this group’s FILES section –
Because the bubble’s travel is a “foot long”, it is far more precise
than my STARRETT.
Very cool, Joe. Congratulations on a great idea.

--- Mike


Re: ... and daytime polar alignment

Tyrel Smith
 

Joe, that makes sense. Thanks for clarifying.

Ty Smith

On Apr 21, 2019, at 15:51, 'Joseph Zeglinski' J.Zeglinski@... [ap-gto] <ap-gto@...> wrote:

 

Hi Tyrel,
 
    I agree with your comments.
In fact. as Rolando has said at times, you can even stand the mount on the side of a sloping hill, polar align on Polaris (with some added difficulty in such case), and you are no worse off than fidgeting with a level. One might use a bubble level for dusk time alignment, to prepare the mount for RAPID deployment. Your comments on RCAL are right on the mark, of course, but polar alignment is so much easier, if you are starting from an already, fairly accurately positioned platform. I don’t need “pencil marks” for either of my older mounts since the AP-900/1200 already has setting circles and their zero reference marks,  can be used for the same purpose, if desired. Only place I made  ink marker positions is on the counterweight bar, for various cwt positions if I change major scope accessories, and also ink markers on a “bandage taped to the D-Plate edge”, to shift the OTA in the plate,  in balancing the OTA when accessories (camera, guider, rotator, etc) are changed.
 
    Most of the time, in fact for years, I just use a small bubble level for a quick mount level “confidence check”.
 
    I use a bubble level on my fixed backyard setup, before each session, just to confirm the heavy scope hasn’t slipped its clutched positions in long intervening periods. It is also possible that in spite of being covered in a light nylon tarp, severe wind gusts could have caused an axis clutch slip as well. Having learned a severe lesson about mushroomed “clutch plugs” in the older series, I now follow the manual instructions NOT to tighten the clutches, beyond finger-tip tight.
 
    So, I use an inexpensive, but fairly good,  pocket-sized  bubble level (with its magnetic strip, longitudinal groove), just to confirm all is orthogonal with the celestial sphere.
 
****** Otherwise *******
 
    However, at the time (2016), when I came up with my “pipette bubble level”, I was investigating why the mount east & west sides were not giving identical pointing accuracies, and indeed different PEMPRO results, depending on which side of the sky it was performed. I needed a super accurate bubble, placed horizontally on the mount base plate, to see if the entire mount on its Losmandy HD tripod may be “tilting or wobbling”, perhaps due to the ground under the tripod feet’s buried concrete block support, shifting or giving way,  when switching sides. The nice foot-long bubble on the pipette, was a perfect “motion or disturbance indicator” as I performed a daytime Meridian Flip – and the bubble stayed in its position. The air bubble itself didn’t need to be at center, for that test. I only realized later, that the existing mm-markings meant for measuring lab fluids, was also bonus as an accurate millimetre “distance” scale for the bubble’s travel,  and indication of how rapidly the tilt was happening, It was important to know if there was a gradual sinking of a pier footing to one side, or if it were  a severe flip-flop each time. If the former, then it was soil related, if it were quick, then there might have been sloppiness in screws, machining tolerances (never !),  or clutch lock down.
 
    So,  no extra work required in adding a measurement recording scale for its use as a bubble level. In fact, I used a camera in movie mode to record any drift of the bubble moving in the log scale, for mechanical drift playback post-analysis.
 
    Once I proved to myself – thanks to the DYI Pipette Bubble Level -  that the mount and rugged tripod was sturdy and stood motionless under all “external” influences, I found other uses for the level on the OTA, etc. However, I was quite impressed in its use as an expensive, more precise, and accurate bubble level. So, I don’t use it regularly, per your comments, but it is nice to have it in my kit, if I ever require a “huge, accurate, easy to use” bubble level, that is temperature independent, doesn’t stick,  and doesn’t even require batteries.
 
Joe Z.
 


Re: ... and daytime polar alignment

Joe Zeglinski
 

Hi Tyrel,
 
    I agree with your comments.
In fact. as Rolando has said at times, you can even stand the mount on the side of a sloping hill, polar align on Polaris (with some added difficulty in such case), and you are no worse off than fidgeting with a level. One might use a bubble level for dusk time alignment, to prepare the mount for RAPID deployment. Your comments on RCAL are right on the mark, of course, but polar alignment is so much easier, if you are starting from an already, fairly accurately positioned platform. I don’t need “pencil marks” for either of my older mounts since the AP-900/1200 already has setting circles and their zero reference marks,  can be used for the same purpose, if desired. Only place I made  ink marker positions is on the counterweight bar, for various cwt positions if I change major scope accessories, and also ink markers on a “bandage taped to the D-Plate edge”, to shift the OTA in the plate,  in balancing the OTA when accessories (camera, guider, rotator, etc) are changed.
 
    Most of the time, in fact for years, I just use a small bubble level for a quick mount level “confidence check”.
 
    I use a bubble level on my fixed backyard setup, before each session, just to confirm the heavy scope hasn’t slipped its clutched positions in long intervening periods. It is also possible that in spite of being covered in a light nylon tarp, severe wind gusts could have caused an axis clutch slip as well. Having learned a severe lesson about mushroomed “clutch plugs” in the older series, I now follow the manual instructions NOT to tighten the clutches, beyond finger-tip tight.
 
    So, I use an inexpensive, but fairly good,  pocket-sized  bubble level (with its magnetic strip, longitudinal groove), just to confirm all is orthogonal with the celestial sphere.
 
****** Otherwise *******
 
    However, at the time (2016), when I came up with my “pipette bubble level”, I was investigating why the mount east & west sides were not giving identical pointing accuracies, and indeed different PEMPRO results, depending on which side of the sky it was performed. I needed a super accurate bubble, placed horizontally on the mount base plate, to see if the entire mount on its Losmandy HD tripod may be “tilting or wobbling”, perhaps due to the ground under the tripod feet’s buried concrete block support, shifting or giving way,  when switching sides. The nice foot-long bubble on the pipette, was a perfect “motion or disturbance indicator” as I performed a daytime Meridian Flip – and the bubble stayed in its position. The air bubble itself didn’t need to be at center, for that test. I only realized later, that the existing mm-markings meant for measuring lab fluids, was also bonus as an accurate millimetre “distance” scale for the bubble’s travel,  and indication of how rapidly the tilt was happening, It was important to know if there was a gradual sinking of a pier footing to one side, or if it were  a severe flip-flop each time. If the former, then it was soil related, if it were quick, then there might have been sloppiness in screws, machining tolerances (never !),  or clutch lock down.
 
    So,  no extra work required in adding a measurement recording scale for its use as a bubble level. In fact, I used a camera in movie mode to record any drift of the bubble moving in the log scale, for mechanical drift playback post-analysis.
 
    Once I proved to myself – thanks to the DYI Pipette Bubble Level -  that the mount and rugged tripod was sturdy and stood motionless under all “external” influences, I found other uses for the level on the OTA, etc. However, I was quite impressed in its use as an expensive, more precise, and accurate bubble level. So, I don’t use it regularly, per your comments, but it is nice to have it in my kit, if I ever require a “huge, accurate, easy to use” bubble level, that is temperature independent, doesn’t stick,  and doesn’t even require batteries.
 
Joe Z.
 


Re: ... and daytime polar alignment

Greg Salyer
 

I also see no value to using such a high precision level for this purpose. I use very cheap 1" plastic levels attached to my scope when I need to initialize my mount and camera during the day followed by a plate solve early at night. But I wonder if high precision levels would be of value in setting up a pier?  

Greg


Re: APCC in Admin Mode?

Ray Gralak
 

Thanks Ray. Is there a need to create an additional port?
No, it is done automatically.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver


-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
Sent: Sunday, April 21, 2019 11:54 AM
To: ap-gto@yahoogroups.com
Subject: Re: [ap-gto] APCC in Admin Mode?



Thanks Ray. Is there a need to create an additional port?


Sent from my iPhone

On Apr 21, 2019, at 11:43 AM, 'Ray Gralak (Groups)' groups3@gralak.com [ap-gto] <ap-gto@yahoogroups.com>
wrote:





Wayne, it is okay for the second driver instance. APCC's virtual ports are allocated to handle the two
instances.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-
physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

> -----Original Message-----
> From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
> Sent: Sunday, April 21, 2019 11:17 AM
> To: ap-gto@yahoogroups.com
> Subject: [ap-gto] APCC in Admin Mode?
>
>
>
> I’m running an imaging automation program called Voyager. It integrates with and manages other
software like
> The Sky X, MaximDL, PHD2 etc to accomplish its functions. To do this, it must run in Admin mode. Per
> recommendations here, APCC is not run in admin mode. The result is that Viyager opens a second
instance of
> the AP ASCOM driver. I haven’t used it enough to know if this will cause a problem, so looking for advice
from
> Ray or others as to how to address it. Is it a problem to run APCC in Admin mode?
>
> Thanks,
>
> Wayne
>
>




Re: APCC in Admin Mode?

Wayne Hixson
 

Thanks Ray. Is there a need to create an additional port?


On Apr 21, 2019, at 11:43 AM, 'Ray Gralak (Groups)' groups3@... [ap-gto] <ap-gto@...> wrote:

 

Wayne, it is okay for the second driver instance. APCC's virtual ports are allocated to handle the two instances.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

> -----Original Message-----
> From: ap-gto@... [mailto:ap-gto@...]
> Sent: Sunday, April 21, 2019 11:17 AM
> To: ap-gto@...
> Subject: [ap-gto] APCC in Admin Mode?
>
>
>
> I’m running an imaging automation program called Voyager. It integrates with and manages other software like
> The Sky X, MaximDL, PHD2 etc to accomplish its functions. To do this, it must run in Admin mode. Per
> recommendations here, APCC is not run in admin mode. The result is that Viyager opens a second instance of
> the AP ASCOM driver. I haven’t used it enough to know if this will cause a problem, so looking for advice from
> Ray or others as to how to address it. Is it a problem to run APCC in Admin mode?
>
> Thanks,
>
> Wayne
>
>


Re: ... and daytime polar alignment

Tyrel Smith
 

I guess I just don’t understand the need for a level, and especially the need for a level each time you tear down/set up, when some very simple indices on the mount make life so simple. Placing a flat-bottomed level on a round counterweight shaft is not that accurate. One with a v-bottom or groove of some sort, mabye more so. I’m more intrigued by this need for an extreme level of accuracy setting up your park position with a level, when all that effort is seemingly nullified when you do your first goto and recal (of if you are imaging, your first plate solve/sync). If you do a goto and recal, then send the mount to your preferred park position, it should then be in the most accurate representation of that park position, regardless of how well you leveled the counterweight shaft when you set up your preferred park position. My understanding is that the only thing accomplished by a precise predetermination of your park position is the accuracy of the very first goto command. Do I have a misunderstanding of how the mount behaves. I’d like to be corrected if that is the case. I could have some previous mount logic creeping in.

Having some indices on your axis has the benefit of being able to unlock the clutches and then being able to relatively accurately (the width of a pencil mark) put the mount back in the park position without a trip to the toolbox.

Seriously, I have never once put a level on my Mach1 counterweight shaft. I did one platesolve/sync, sent the mount to park 3, put a piece of tape across the two axis with a pen mark, cut the tape with a razor, and moved on. At the end of my imaging sessions when I send the mount back to park 3 it lines the pen lines up every time. I either unpark from last position, or line up the marks and unpark from park 3. If I am missing something, someone please let me know. I’m always looking for ways to improve my setup. If using the level is zen/ritualistic thing for some folks, thats ok by me. There is no judgement in this dojo! 



On Apr 21, 2019, at 13:16, 'Joseph Zeglinski' J.Zeglinski@... [ap-gto] <ap-gto@...> wrote:


Mike,
 
    Have a look at my DYI Bubble Level in this group’s FILES section – Because the bubble’s travel is a “foot long”, it is far more precise than my STARRETT.  The “pipette” is already marked out with fine millimetre divisions by design, since it is already precisely marked for measuring “millilitres” in the lab. That’s “lab accuracy” as good as for a machinist’s use.
 
    It also cost me about $2 (for a used pipette – they are disposable, easier to find), compared to a Starrett costing over a hundred (?) dollars, and is far easier to read a large bubble on a long path. Because it has so much more fluid, the bubble starts to travel at just a hare’s breath of a tilt, compared to the smaller tube in a machinist’s level. Besides, the pipette is Plexiglas, or tempered glass, (lab use safety concern), so it won’t break when dropped or banged in travel,  as my old STARRETT glass tube did.
 
    you can fill the pipette bubble level with turpentine, radiator cold weather antifreeze, or with (coloured) winter windshield wiper fluid, for outdoor cold temperature use. You can even add an LED lighting to the tube top or ends for easier night use.
 
    See PDF article  and photos:   DIY BUBBLE LEVEL TOOL.pdf  ( ASTROJAZ - Jan 31, 2016)
 
Joe Z.



Re: APCC in Admin Mode?

Ray Gralak
 

Wayne, it is okay for the second driver instance. APCC's virtual ports are allocated to handle the two instances.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
Sent: Sunday, April 21, 2019 11:17 AM
To: ap-gto@yahoogroups.com
Subject: [ap-gto] APCC in Admin Mode?



I’m running an imaging automation program called Voyager. It integrates with and manages other software like
The Sky X, MaximDL, PHD2 etc to accomplish its functions. To do this, it must run in Admin mode. Per
recommendations here, APCC is not run in admin mode. The result is that Viyager opens a second instance of
the AP ASCOM driver. I haven’t used it enough to know if this will cause a problem, so looking for advice from
Ray or others as to how to address it. Is it a problem to run APCC in Admin mode?

Thanks,

Wayne


APCC in Admin Mode?

Wayne Hixson
 

I’m running an imaging automation program called Voyager. It integrates with and manages other software like The Sky X, MaximDL, PHD2 etc to accomplish its functions. To do this, it must run in Admin mode. Per recommendations here, APCC is not run in admin mode. The result is that Viyager opens a second instance of the AP ASCOM driver. I haven’t used it enough to know if this will cause a problem, so looking for advice from Ray or others as to how to address it. Is it a problem to run APCC in Admin mode?

Thanks,

Wayne


Re: APCC Modeling a pointing model

Ray Gralak
 

Konstantin,

Okay, I'll be able to see the version in the logs I will need from you. Please use APCC's log zipper utility and include the APCC, APPM, and ASCOM driver logs.

This might be something specific to the 3600 mount so please email the logs to me and Howard. If they are too big (>6MB) you may need to email us a dropbox link.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
Sent: Sunday, April 21, 2019 10:34 AM
To: Dale Ghent daleg@elemental.org [ap-gto]
Subject: Re: [ap-gto] APCC Modeling a pointing model



Hi Ray,

I can not find a way to prove it cause the mount is not here in Hamburg. I can remember that I have changed it
with my computer with a connection over ethernet. Marj send a mail with the announcement of the update and I
can’t remember of another one.

Was it this zip file that was downloadable? VCP4-P01-11_WiFi_A402_secure

Konstantin


Konstantin v. Poschinger

Hammerichstr. 5
22605 Hamburg
040/8805747
0171 1983476


Am 21.04.2019 um 19:11 schrieb 'Ray Gralak (Groups)' groups3@gralak.com [ap-gto] <ap-
gto@yahoogroups.com>:


> GTOCP4 with the newest firmware.

Which version exactly? "Newest version" can mean different things to different people!

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-
physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com <https://www.ccdware.com/>
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

> -----Original Message-----
> From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
> Sent: Sunday, April 21, 2019 8:10 AM
> To: ap-gto@yahoogroups.com
> Subject: Re: [ap-gto] APCC Modeling a pointing model
>
>
>
> GTOCP4 with the newest firmware.
>
>
> Grüsse
>
> Konstantin v. Poschinger
>
>
> Hammerichstr. 5
> 22605 Hamburg
> 040/8805747
> 0171/1983476
>
> Am 21.04.2019 um 14:41 schrieb 'Ray Gralak (Groups)' groups3@gralak.com [ap-gto] <ap-
> gto@yahoogroups.com>:
>
>
>
>
>
> Hi Konstantin,
>
> Which controller and version of firmware are you using?
>
> -Ray Gralak
> Author of APCC (Astro-Physics Command Center): http://www.astro-
> physics.com/index.htm?products/accessories/software/apcc/apcc
<http://physics..com/index.htm?products/accessories/software/apcc/apcc>
> Author of PEMPro V3: https://www.ccdware.com
> Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver
>
> > -----Original Message-----
> > From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
> > Sent: Saturday, April 20, 2019 3:26 AM
> > To: ap-gto@yahoogroups.com
> > Subject: [ap-gto] APCC Modeling a pointing model
> >
> >
> >
> > Hi Ray,
> >
> > when I buid a pointing model, the mount do after a slew again a short slew. This, when I have points in
> the
> > counterwight up position, ended in a big reslew to the meridian and back to the point that should be
> mesured.
> > Sometimes the reslew happened more than one time.
> > How can I prevent the big reslews?
> > I use the latest APCC Pro 1.7.1.1 and AP-V2 5.20.09
> >
> > Grüsse
> >
> > Konstantin v. Poschinger
> >
> > Hammerichstr. 5
> > 22605 Hamburg
> > 040/8805747
> > 0171/1983476
> >
> >
> >
>
>
>
>





Re: APCC Modeling a pointing model

Konstantin von Poschinger
 

Hi Ray,

I can not find a way to prove it cause the mount is not here in Hamburg. I can remember that I have changed it with my computer with a connection over ethernet. Marj send a mail with the announcement of the update and I can’t remember of another one.

Was it this zip file that was downloadable? VCP4-P01-11_WiFi_A402_secure

Konstantin


Konstantin v. Poschinger

Hammerichstr. 5
22605 Hamburg
040/8805747
0171 1983476

Am 21.04.2019 um 19:11 schrieb 'Ray Gralak (Groups)' groups3@... [ap-gto] <ap-gto@...>:

> GTOCP4 with the newest firmware.

Which version exactly? "Newest version" can mean different things to different people!

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc 
Author of PEMPro V3:  https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

> -----Original Message-----
> From: ap-gto@... [mailto:ap-gto@...]
> Sent: Sunday, April 21, 2019 8:10 AM
> To: ap-gto@...
> Subject: Re: [ap-gto] APCC Modeling a pointing model
> 
> 
> 
> GTOCP4 with the newest firmware.
> 
> 
> Grüsse
> 
> Konstantin v. Poschinger
> 
> 
> Hammerichstr. 5
> 22605 Hamburg
> 040/8805747
> 0171/1983476
> 
> Am 21.04.2019 um 14:41 schrieb 'Ray Gralak (Groups)' groups3@... [ap-gto] > gto@...>:
> 
> 
> 
> 
> 
> Hi Konstantin,
> 
> Which controller and version of firmware are you using?
> 
> -Ray Gralak
> Author of APCC (Astro-Physics Command Center): http://www.astro-
> physics.com/index.htm?products/accessories/software/apcc/apcc
> Author of PEMPro V3: https://www.ccdware.com
> Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver
> 
> > -----Original Message-----
> > From: ap-gto@... [mailto:ap-gto@...]
> > Sent: Saturday, April 20, 2019 3:26 AM
> > To: ap-gto@...
> > Subject: [ap-gto] APCC Modeling a pointing model
> >
> >
> >
> > Hi Ray,
> >
> > when I buid a pointing model, the mount do after a slew again a short slew. This, when I have points in
> the
> > counterwight up position, ended in a big reslew to the meridian and back to the point that should be
> mesured.
> > Sometimes the reslew happened more than one time.
> > How can I prevent the big reslews?
> > I use the latest APCC Pro 1.7.1.1 and AP-V2 5.20.09
> >
> > Grüsse
> >
> > Konstantin v. Poschinger
> >
> > Hammerichstr. 5
> > 22605 Hamburg
> > 040/8805747
> > 0171/1983476
> >
> >
> >
> 
> 
> 
> 



Re: ... and daytime polar alignment

Joe Zeglinski
 

Mike,
 
    Have a look at my DYI Bubble Level in this group’s FILES section – Because the bubble’s travel is a “foot long”, it is far more precise than my STARRETT.  The “pipette” is already marked out with fine millimetre divisions by design, since it is already precisely marked for measuring “millilitres” in the lab. That’s “lab accuracy” as good as for a machinist’s use.
 
    It also cost me about $2 (for a used pipette – they are disposable, easier to find), compared to a Starrett costing over a hundred (?) dollars, and is far easier to read a large bubble on a long path. Because it has so much more fluid, the bubble starts to travel at just a hare’s breath of a tilt, compared to the smaller tube in a machinist’s level. Besides, the pipette is Plexiglas, or tempered glass, (lab use safety concern), so it won’t break when dropped or banged in travel,  as my old STARRETT glass tube did.
 
    you can fill the pipette bubble level with turpentine, radiator cold weather antifreeze, or with (coloured) winter windshield wiper fluid, for outdoor cold temperature use. You can even add an LED lighting to the tube top or ends for easier night use.
 
    See PDF article  and photos:   DIY BUBBLE LEVEL TOOL.pdf  ( ASTROJAZ - Jan 31, 2016)
 
Joe Z.


Re: ... and daytime polar alignment

Wayne Hixson
 

One thing about the Starrett glass levels. If you leave it on the scope or counterweight shaft and slew to the next position, it WILL fall off and it WILL break and it WILL be expensive to replace! I know!

Wayne


On Apr 21, 2019, at 10:09 AM, Mike Dodd mike@... [ap-gto] <ap-gto@...> wrote:

 

On 4/21/2019 12:52 PM, 'Joseph Zeglinski' J.Zeglinski@...
[ap-gto] wrote:
>
>
> Hi Mike,
> One thing that always concerns me is whether I can rely on a bubble
> level – of any precision – to be correct when placed on the
> counterweight shaft. I have about 60 lbs at the END of mine, and surely
> there must be “some flex” of the shaft, or even a slight dip in the
> threads at the end of my AP900/1200 mount axis, or its end cap.

Yes, that's a definite possibility. Placing the level as close as
possible to the threaded end of the shaft is best. But there absolutely
could be some mechanical inaccuracy in the shaft.

> So, I
> prefer to place the bubble level right on the mount body itself. There
> should have been one in the design, possibly where the AP nameplate was
> fastened.

That sure would have been nice. Too late now.

> On the DEC balance, I hold the level right on the doveplate edge –
> where the Starrett groove fits nicely along the D-Plate edge - since
> the OTA can flex, especially a truss, according to some.

That's a very good idea.

--- Mike


Re: APCC Modeling a pointing model

Ray Gralak
 

GTOCP4 with the newest firmware.
Which version exactly? "Newest version" can mean different things to different people!

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver


-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
Sent: Sunday, April 21, 2019 8:10 AM
To: ap-gto@yahoogroups.com
Subject: Re: [ap-gto] APCC Modeling a pointing model



GTOCP4 with the newest firmware.


Grüsse

Konstantin v. Poschinger


Hammerichstr. 5
22605 Hamburg
040/8805747
0171/1983476

Am 21.04.2019 um 14:41 schrieb 'Ray Gralak (Groups)' groups3@gralak.com [ap-gto] <ap-
gto@yahoogroups.com>:





Hi Konstantin,

Which controller and version of firmware are you using?

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-
physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver

> -----Original Message-----
> From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]
> Sent: Saturday, April 20, 2019 3:26 AM
> To: ap-gto@yahoogroups.com
> Subject: [ap-gto] APCC Modeling a pointing model
>
>
>
> Hi Ray,
>
> when I buid a pointing model, the mount do after a slew again a short slew. This, when I have points in
the
> counterwight up position, ended in a big reslew to the meridian and back to the point that should be
mesured.
> Sometimes the reslew happened more than one time.
> How can I prevent the big reslews?
> I use the latest APCC Pro 1.7.1.1 and AP-V2 5.20.09
>
> Grüsse
>
> Konstantin v. Poschinger
>
> Hammerichstr. 5
> 22605 Hamburg
> 040/8805747
> 0171/1983476
>
>
>




Re: ... and daytime polar alignment

Mike Dodd
 

On 4/21/2019 12:52 PM, 'Joseph Zeglinski' J.Zeglinski@rogers.com [ap-gto] wrote:


Hi Mike,
One thing that always concerns me is whether I can rely on a bubble
level – of any precision – to be correct when placed on the
counterweight shaft. I have about 60 lbs at the END of mine, and surely
there must be “some flex” of the shaft, or even a slight dip in the
threads at the end of my AP900/1200 mount axis, or its end cap.
Yes, that's a definite possibility. Placing the level as close as possible to the threaded end of the shaft is best. But there absolutely could be some mechanical inaccuracy in the shaft.

So, I
prefer to place the bubble level right on the mount body itself. There
should have been one in the design, possibly where the AP nameplate was
fastened.
That sure would have been nice. Too late now.

On the DEC balance, I hold the level right on the doveplate edge –
where the Starrett groove fits nicely along the D-Plate edge - since
the OTA can flex, especially a truss, according to some.
That's a very good idea.

--- Mike


Re: Question about absolute encoders and daytime polar alignment

Joe Zeglinski
 

Miguel,
 
    I think digital levels are less accurate than a bubble, especially when it is cold.
They depend on a “swinging pendulum disc” inside, and those can stick in freezing temperatures. If you check, sometimes you need to give them a tap, to overcome this stiction.    But they are adequate for most cases.
 
Joe


Re: ... and daytime polar alignment

Joe Zeglinski
 

Hi  Mike,
 
    One thing that always concerns me is whether I can rely on a bubble level – of any precision – to be correct when placed on the counterweight shaft. I have about 60 lbs at the END of mine, and surely there must be “some flex” of the shaft, or even a slight  dip in the threads at the end of my AP900/1200 mount axis, or its end cap. So, I prefer to place the bubble level right on the mount body itself. There should have been one in the design, possibly where the AP nameplate was fastened.
 
    On the DEC balance, I hold the level right on the doveplate edge – where the Starrett groove fits nicely along the D-Plate edge -  since the OTA can flex, especially a truss, according to some.
 
Joe


Re: Question about absolute encoders and daytime polar alignment

miguelmjr14@...
 

Using a carpenters level is not the most accurate, that is for sure. I use a digital level that I calibrate each time before use.

I'm not sure if it is more accurate than an expensive machinist level but they are cheaper if that is a concern.


Miguel   8-)

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