Date   

Re: set screw question

M Hambrick
 

Hi Peter

The set screw in my Y-cable is a stainless steel 3-48 socket head set screw. The length is 1/16 inch. It takes a 0.050" Allen wrench. Oddly, I do not see that size in the McMaster catalog in stainless steel, but they have them in carbon steel.


Short Orion Nebula and Running Man

Bill Long
 

Hey AP'ers!

Since we have been clouded in here in WA for a long time, I was picking through some old data on an imaging laptop of mine and came across 1.5 hours or M42 data I took from a relatively dark location in Ellensburg, WA. The data was taken on December 10, 2020 and just sat on my laptop until I finally recused it this evening and processed it up.

RGB x 6 (each channel) x 180s, Lum x 12 x 180 seconds.


Scope was the trusty AP130 GTX with the field flattener. Camera is the FLI PL16803, mount is the AP1100AE.

Not too shabby for a really short integration of 1.5 hours!

Enjoy,

Bill


Re: set screw question

Brian McFarland
 

Also try McMaster-Carr. They have quite a wide variety of set screws.


Re: set screw question

Mike Dodd
 

On 5/4/2022 12:07 PM, Karen Christen wrote:
It's part of the Y cable. I lost it years ago, and I'd rather not
throw out a perfectly good cable when all I'm missing is a screw.
I'm guessing it's a 4-40 screw, but good luck finding one that short with a hex recess at your local screw emporium.

A better approach might be to search Digi-Key or Mouser for that same connector (it's fairly common), buy it, and harvest the screw for your A-P connector.

--- Mike


Re: set screw question

Karen Christen
 

Here’s the link to the photo:

The following photos have been uploaded to the set screw album of the main@ap-gto.groups.io group.

By: Peter Santangeli <peter@...>

Karen

AP

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Peter Santangeli
Sent: Wednesday, May 4, 2022 10:49 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] set screw question

 

Hi George,

 

I put the photo in an album called 'setscrew'. Not sure how to reference a photo on the forum here. 

 

It' actually the little setscrew that is visible through a hole inside the connector as you rotate the piece that screws on to the controller.

 

pete

 

 

 

On Wed, May 4, 2022 at 8:43 AM George <george@...> wrote:

Peter,

 

I don’t see your photo, but you may be referring to:

 

Servo cable strain relief “U” clamps use

M2 x 8 mm slotted screws

 

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

Video Tutorials: https://www.youtube.com/astrophysicscorp 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Peter Santangeli
Sent: Wednesday, May 4, 2022 10:26 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] set screw question

 

Does anyone know what the length and thread of the following set screw is:

https://ap-gto.groups.io/g/main/photo/274817/3424920?p=Created%2C%2C%2C20%2C2%2C0%2C0

It's part of the Y cable. I lost it years ago, and I'd rather not throw out a perfectly good cable when all I'm missing is a screw.

pete


--
Karen Christen
Astro-Physics


Re: set screw question

Peter Santangeli
 

Hi George,

I put the photo in an album called 'setscrew'. Not sure how to reference a photo on the forum here. 

It' actually the little setscrew that is visible through a hole inside the connector as you rotate the piece that screws on to the controller.

pete



On Wed, May 4, 2022 at 8:43 AM George <george@...> wrote:

Peter,

 

I don’t see your photo, but you may be referring to:

 

Servo cable strain relief “U” clamps use

M2 x 8 mm slotted screws

 

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

Video Tutorials: https://www.youtube.com/astrophysicscorp 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Peter Santangeli
Sent: Wednesday, May 4, 2022 10:26 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] set screw question

 

Does anyone know what the length and thread of the following set screw is:

https://ap-gto.groups.io/g/main/photo/274817/3424920?p=Created%2C%2C%2C20%2C2%2C0%2C0

It's part of the Y cable. I lost it years ago, and I'd rather not throw out a perfectly good cable when all I'm missing is a screw.

pete


Re: set screw question

George
 

Peter,

 

I don’t see your photo, but you may be referring to:

 

Servo cable strain relief “U” clamps use

M2 x 8 mm slotted screws

 

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

Video Tutorials: https://www.youtube.com/astrophysicscorp 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Peter Santangeli
Sent: Wednesday, May 4, 2022 10:26 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] set screw question

 

Does anyone know what the length and thread of the following set screw is:

https://ap-gto.groups.io/g/main/photo/274817/3424920?p=Created%2C%2C%2C20%2C2%2C0%2C0

It's part of the Y cable. I lost it years ago, and I'd rather not throw out a perfectly good cable when all I'm missing is a screw.

pete


set screw question

Peter Santangeli
 

Does anyone know what the length and thread of the following set screw is:

https://ap-gto.groups.io/g/main/photo/274817/3424920?p=Created%2C%2C%2C20%2C2%2C0%2C0

It's part of the Y cable. I lost it years ago, and I'd rather not throw out a perfectly good cable when all I'm missing is a screw.

pete


Re: AP1100 autoguiding

Mike Dodd
 

On 5/4/2022 9:03 AM, christopheciel via groups.io wrote:

Unfortunately, I only own a Canon 650 DSLR, right now,[...] The astronomical camera will come more later, next winter.
Will try the Lacerta Mgen, and, if not working properly, order a small autoguiding camera such as a zwo asi 120 or 290 mini.
I use an ASI120 as a guide camera, but it also can be a "main" camera on a telescope. It has a small FOV, but plenty large enough to get you started.

You can use a '120 or '290 with PEMPro to do a polar alignment and to create a PE curve. Just attach the camera to your main telescope, then tell PEMPro it is your imaging camera. You will need to download and install the ZWO ASCOM driver so PEMPro can connect to your camera.

--- Mike
http://astronomy.mdodd.com


Re: AP1100 autoguiding

christopheciel
 

Dear all,


Thanks for the very accurate and informative replies.


Indeed, « derive » was not the correct word, Oliv, You're right. I meant drift, of course. So sorry.


Unfortunately, I only own a Canon 650 DSLR, right now, and I'm almost sure that I cannot use it with Pempro or even perform a polar alignment with such a software like phd2 guiding. The astronomical camera will come more later, next winter.


I think the primary drift defect, is in dec, and comes from a bad polar alignment, causing also some imperfections when using the goto.


Gear re-meshing is a good idea. I will try it asap. I suspect that the precedent owner of this mount possibly never did it. I asked him yeasterday, but I'm waiting for his answer. He possibly rely on the only autoguiding/APCC to correct all the drift defects, and was successful, as his really good images prove it. Beside being a nice person, he is also a keen and competent astrophotographer.


Anyway, I will also check upon the orthogonality, and try to get a precise measurement of the drift, both in RA and dec. Actually, my scope is a C11edge, and it is set up on a 16'' losmandy dovetail saddle, such a system most probably being well orthogonal.


Will try the Lacerta Mgen, and, if not working properly, order a small autoguiding camera such as a zwo asi 120 or 290 mini.


Once more, many thanks for the help and advices. I will come back later, as soon as weather permits to perform some tests on the sky.


Oliv, I will contact you via Astrosurf or WA soon, if you like.


Cheers,

Christophe



Le mardi 3 mai 2022, 03:44:24 UTC+2, Howard Hedlund <howard@...> a écrit :


Hi Christophe,

Congratulations on acquiring the 1100GTO.  You will love it!

Pointing errors can have several sources:
  • The most common cause of pointing errors is polar misalignment.
  • If the RAPAS was not properly calibrated, it may not give good results.  If it was calibrated incorrectly, it will certainly fail to give good pointing.
  • Orthogonality affects pointing, especially nearer to the pole.  Orthogonality problems show themselves most strongly after a meridian flip.
  • Pointing problems are almost never the fault of the mount.
As Oliv points out, one of the first things to determine is whether your drift is in RA, Dec or in both axes.  You can easily determine which direction on the chip is RA by stopping tracking for a short while in the middle of an image.  The streak that results will be in the direction of RA.

You will need to either create a good PE curve or autoguide.  If you received the copy of PEMPro that came with the mount, you can both cure the periodic error and fix the polar alignment at the same time.

You may or may not need to remesh the gears.  This can be quite easily tested using the instructions in our website's technical support section.  https://astro-physics.info/tech_support/mounts/gear-mesh-1600-1100-mach1-2014-10-24.pdf 

Contact me at Astro-Physics for further assistance.

Howard


Re: Need help identifying Counterweight shaft stop to buy

Howard Hedlund
 
Edited

For testing, try a knob from a counterweight.  It should also have  5/16"-18  threads.
You may want to have someone with a 5/16"-18 tap chase the threads in the shaft.


Re: AP1100 autoguiding

Howard Hedlund
 

Hi Christophe,

Congratulations on acquiring the 1100GTO.  You will love it!

Pointing errors can have several sources:
  • The most common cause of pointing errors is polar misalignment.
  • If the RAPAS was not properly calibrated, it may not give good results.  If it was calibrated incorrectly, it will certainly fail to give good pointing.
  • Orthogonality affects pointing, especially nearer to the pole.  Orthogonality problems show themselves most strongly after a meridian flip.
  • Pointing problems are almost never the fault of the mount.
As Oliv points out, one of the first things to determine is whether your drift is in RA, Dec or in both axes.  You can easily determine which direction on the chip is RA by stopping tracking for a short while in the middle of an image.  The streak that results will be in the direction of RA.

You will need to either create a good PE curve or autoguide.  If you received the copy of PEMPro that came with the mount, you can both cure the periodic error and fix the polar alignment at the same time.

You may or may not need to remesh the gears.  This can be quite easily tested using the instructions in our website's technical support section.  https://astro-physics.info/tech_support/mounts/gear-mesh-1600-1100-mach1-2014-10-24.pdf 

Contact me at Astro-Physics for further assistance.

Howard


Re: AP1100 autoguiding

OlivDeso
 

p.s. pointing and drift are 2 different subjets

- drift along DEC is related to polar alignment (so a pure mecanical topic)
- pointing is related to the calibration of the pointing model. (mainly a software synchronisation subject)


Le lundi 2 mai 2022, 19:00:37 UTC+2, OlivDeso <olivdeso@...> a écrit :


Hello Christophe

The pointing is usually 15-20 arcmin off, on any target in the sky, and, last night, I tried to image M101, and saw that the derive is something like 30" per hour on such a target. The max exposure time I could do was 60sec at 1900 mm focal length.


by "dérive" which is the French word, do you mean drift I guess, so you get trailling stars.

Do you know I which direction? RA? DEC? or both?

Drift along DEC -> polar align is not good enough  -> perform a very acurate drift aligment using pempro, then fine tune the rapas
Drift along RA axis -> PE -> perform gear remeshing, then PE measurement with pempro and then upload PEC from pempro to the mount


There are 2 things to do to improve the PE :

1) gear re-meshing : first of all, before any PE measurement, it is very important to have a proper gear meshing, especially if the mount has travelled and/or was used at a different temperature.

-> follow the AP procedure here, it isvery simple and very efficient.




On to of that, I 'd like to mention a trick : on the forst AP1100, I found the CP3 motor spring loader to be a little bit to strong. It fact it comes from the screw which secure the spring : the thread is a little bit too short compared to the spring length. Not a big deal for DEC, but significant for RA.

My advise : on these older AP1100, while tuning the RA mesh, unscrew the spring holding screew by 2 turns, not more. and follow the AP procedure.
It will ensure applying just the needed pressure to get the best meshing and lowest EP.
Once this gear meshing is done, you can 

2) Once gear mesh has been properly set, you can run pempro and measure the PE.
- first polar align precisely enough, using the drift alingment tool
- measure the PE between +1° and +5° after the meridian, not more. "rewind" if needed



Are the RJ11-6 and RJ12 plugs compatible ? -> yes, in fact RJ11 is the 4 contacts version of the RJ12 

(RJ11 6 positions 4 contact (6p4c) and RJ12 6p6c. So RJ11-6 is a wrong naming, the right naming is RJ12 for 6p6c RJ plug)

Now since you have the CP4 ou CP3, you could also use the pulse guiding whicjh is a little bit more acurate than the ST4 : the mount itself manages the pulse duration. Thought in this particular case, the difference is likely to be marginal with the Lacerta Mgen. (it could be more signigficant with an old PC)


clear skies

Oliv Deso
Le lundi 2 mai 2022, 05:26:56 UTC+2, christopheciel via groups.io <christopheciel@...> a écrit :


Dear all,


My name is Christophe, from France.

This is my first message here.

My english is not very good, as you will see ; I hope you will understand what I mean.


This forum is a great idea.


**


I bought a used 1100 GTO a few months ago from a very nice person, who had it in a small observatory.

This precedent owner had a CP3, then he bought a CP4. He never actualized the PEM, so there is none, using only the mount with a PC and an autoguiding camera to image.


After a couple of weeks of use, I still have some issue with the pointing and tracking. I use only the keypad. The pointing is usually 15-20 arcmin off, on any target in the sky, and, last night, I tried to image M101, and saw that the derive is something like 30" per hour on such a target. The max exposure time I could do was 60sec at 1900 mm focal length.


I calibrated the RAPAS as indicated in the rapas notice, and the mount is leveled as perfectly as I could.


Well, I'm now looking for an autoguiding camera in order to enhance the tracking.


I have a old LACERTA MGEN stand alone autoguiding camera.


https://en.lacerta-optics.com/MGEN_Lacerta-MGEN-II-Superguider-Autoguider-Camera-with


The out plug of this system is an ST4 or RJ12 male plug. I understand that the autoguiding female plug on the CP4 is a RJ11-6 plug.


Are the RJ11-6 and RJ12 plugs compatible ?


So had some of you ever used a same lacerta mgen system on a 1100 GTO ? Do you think this is possible ?


Or should I avoid to use this camera and buy another on ? I have a limited budget right now, alas.


Thank you so much for any help or advice.


Christophe



Re: AP1100 autoguiding

OlivDeso
 

Hello Christophe

The pointing is usually 15-20 arcmin off, on any target in the sky, and, last night, I tried to image M101, and saw that the derive is something like 30" per hour on such a target. The max exposure time I could do was 60sec at 1900 mm focal length.


by "dérive" which is the French word, do you mean drift I guess, so you get trailling stars.

Do you know I which direction? RA? DEC? or both?

Drift along DEC -> polar align is not good enough  -> perform a very acurate drift aligment using pempro, then fine tune the rapas
Drift along RA axis -> PE -> perform gear remeshing, then PE measurement with pempro and then upload PEC from pempro to the mount


There are 2 things to do to improve the PE :

1) gear re-meshing : first of all, before any PE measurement, it is very important to have a proper gear meshing, especially if the mount has travelled and/or was used at a different temperature.

-> follow the AP procedure here, it isvery simple and very efficient.




On to of that, I 'd like to mention a trick : on the forst AP1100, I found the CP3 motor spring loader to be a little bit to strong. It fact it comes from the screw which secure the spring : the thread is a little bit too short compared to the spring length. Not a big deal for DEC, but significant for RA.

My advise : on these older AP1100, while tuning the RA mesh, unscrew the spring holding screew by 2 turns, not more. and follow the AP procedure.
It will ensure applying just the needed pressure to get the best meshing and lowest EP.
Once this gear meshing is done, you can 

2) Once gear mesh has been properly set, you can run pempro and measure the PE.
- first polar align precisely enough, using the drift alingment tool
- measure the PE between +1° and +5° after the meridian, not more. "rewind" if needed



Are the RJ11-6 and RJ12 plugs compatible ? -> yes, in fact RJ11 is the 4 contacts version of the RJ12 

(RJ11 6 positions 4 contact (6p4c) and RJ12 6p6c. So RJ11-6 is a wrong naming, the right naming is RJ12 for 6p6c RJ plug)

Now since you have the CP4 ou CP3, you could also use the pulse guiding whicjh is a little bit more acurate than the ST4 : the mount itself manages the pulse duration. Thought in this particular case, the difference is likely to be marginal with the Lacerta Mgen. (it could be more signigficant with an old PC)


clear skies

Oliv Deso
Le lundi 2 mai 2022, 05:26:56 UTC+2, christopheciel via groups.io <christopheciel@...> a écrit :


Dear all,


My name is Christophe, from France.

This is my first message here.

My english is not very good, as you will see ; I hope you will understand what I mean.


This forum is a great idea.


**


I bought a used 1100 GTO a few months ago from a very nice person, who had it in a small observatory.

This precedent owner had a CP3, then he bought a CP4. He never actualized the PEM, so there is none, using only the mount with a PC and an autoguiding camera to image.


After a couple of weeks of use, I still have some issue with the pointing and tracking. I use only the keypad. The pointing is usually 15-20 arcmin off, on any target in the sky, and, last night, I tried to image M101, and saw that the derive is something like 30" per hour on such a target. The max exposure time I could do was 60sec at 1900 mm focal length.


I calibrated the RAPAS as indicated in the rapas notice, and the mount is leveled as perfectly as I could.


Well, I'm now looking for an autoguiding camera in order to enhance the tracking.


I have a old LACERTA MGEN stand alone autoguiding camera.


https://en.lacerta-optics.com/MGEN_Lacerta-MGEN-II-Superguider-Autoguider-Camera-with


The out plug of this system is an ST4 or RJ12 male plug. I understand that the autoguiding female plug on the CP4 is a RJ11-6 plug.


Are the RJ11-6 and RJ12 plugs compatible ?


So had some of you ever used a same lacerta mgen system on a 1100 GTO ? Do you think this is possible ?


Or should I avoid to use this camera and buy another on ? I have a limited budget right now, alas.


Thank you so much for any help or advice.


Christophe



AP1100 autoguiding

christopheciel
 

Dear all,


My name is Christophe, from France.

This is my first message here.

My english is not very good, as you will see ; I hope you will understand what I mean.


This forum is a great idea.


**


I bought a used 1100 GTO a few months ago from a very nice person, who had it in a small observatory.

This precedent owner had a CP3, then he bought a CP4. He never actualized the PEM, so there is none, using only the mount with a PC and an autoguiding camera to image.


After a couple of weeks of use, I still have some issue with the pointing and tracking. I use only the keypad. The pointing is usually 15-20 arcmin off, on any target in the sky, and, last night, I tried to image M101, and saw that the derive is something like 30" per hour on such a target. The max exposure time I could do was 60sec at 1900 mm focal length.


I calibrated the RAPAS as indicated in the rapas notice, and the mount is leveled as perfectly as I could.


Well, I'm now looking for an autoguiding camera in order to enhance the tracking.


I have a old LACERTA MGEN stand alone autoguiding camera.


https://en.lacerta-optics.com/MGEN_Lacerta-MGEN-II-Superguider-Autoguider-Camera-with


The out plug of this system is an ST4 or RJ12 male plug. I understand that the autoguiding female plug on the CP4 is a RJ11-6 plug.


Are the RJ11-6 and RJ12 plugs compatible ?


So had some of you ever used a same lacerta mgen system on a 1100 GTO ? Do you think this is possible ?


Or should I avoid to use this camera and buy another on ? I have a limited budget right now, alas.


Thank you so much for any help or advice.


Christophe



Re: re greasing worm wheel on 1100GTO original gearbox.

Dan_Paris
 

As  someone else noticed in a recent thread, the Aeroshell 33 composition may have changed recently but the present one contains dialkyl sulphide (safety data sheet updated in 2021). Is there a danger for brass and bronze gears?

As an alternative, the Molykote 33 seems easy to get in Europe.




Re: Too Windy to Go Long?

Dean Jacobsen
 

Thanks Terry and Roland.


On Sat, Apr 30, 2022 at 05:00 PM, Roland Christen wrote:
How well does this scope cover a full frame 35mm camera, ZWO6200?
I honestly don't know.  The secondary isn't very big -- about 2" diameter looking from the front of the scope.  I don't own a full frame camera any more.  I was surprised that the APS-C camera works as well as it does with the Baader MPCC.  I thought I would end up using my 4/3" camera [ASI294MM] or have to get a 1" sized camera for this scope, or end up cropping my images.  The stars aren't perfect across the entire detector with the APS-C camera but they are plenty good for me.
 
--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/


Re: Too Windy to Go Long?

Terry Martin
 

Very nice Dean.


Re: Too Windy to Go Long?

Roland Christen
 

Nice indeed!

How well does this scope cover a full frame 35mm camera, ZWO6200?

Roland

-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Sat, Apr 30, 2022 6:39 pm
Subject: Re: [ap-gto] Too Windy to Go Long?

I was able to get out for an overnight session.  This time I used the 1000mm fl f/6 Newtonian and got some egg shaped stars due to light winds.  I discarded the worst ones but kept some.

https://www.astrobin.com/full/fk07uk/0/

An annotated version:

https://www.astrobin.com/full/fk07uk/B/

Equipment - ASI2600MC Pro with the Takahashi MT-160 at f/6 (using Baader MPCC).  Carried by the Mach2.  60 x 240 second exposures.  Unguided.

--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/

--
Roland Christen
Astro-Physics


Re: Too Windy to Go Long?

Dean Jacobsen
 

I was able to get out for an overnight session.  This time I used the 1000mm fl f/6 Newtonian and got some egg shaped stars due to light winds.  I discarded the worst ones but kept some.

https://www.astrobin.com/full/fk07uk/0/

An annotated version:

https://www.astrobin.com/full/fk07uk/B/

Equipment - ASI2600MC Pro with the Takahashi MT-160 at f/6 (using Baader MPCC).  Carried by the Mach2.  60 x 240 second exposures.  Unguided.

--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/

4321 - 4340 of 90467