Date   

Re: More APPM Results -- Can Someone Help Me Understand This?

mjb87@...
 

BTW, I am using PinPoint and they do NOT recommend UCAV4.


Re: AP1100 park position question

Jack Huerkamp
 

Don,

 

Note that the DL2 is available in three thrust capacities – 1000 Newton, 1500 Newton and 2500 Newton (220#, 333# and 555#).  I am using a dual column system so I went from a 440# lifting capacity to a 1111# lifting capacity.

 

Yours truly,

 

Jack

 

Jack Huerkamp

Jack's Astro Accessories, LLC

38388 Pine Street

Pearl River, LA 70452-5192

985-445-5063

mallincamusa@...

www.mallincamusa.com

30.37N  89.76W

 

All of us get lost in the darkness.
Dreamers learn to steer by the stars.

………………………………….Neil Peart

 

 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Don Anderson via groups.io
Sent: Wednesday, April 21, 2021 7:34 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] AP1100 park position question

 

Thanks for the info Jack. I suspected as much. I checked ebay and they don't show and DL2s right now. I will have to keep my eyes open for one.

 

Don Anderson

 

 

On Wednesday, April 21, 2021, 07:51:02 a.m. MDT, Jack Huerkamp <mallincamusa@...> wrote:

 

 

Don,

 

When I purchased the original pair of lifting columns from Linak, I was over the engineering department of the local public works department in New Orleans and we did a lot of custom fabrications for all of our facilities.  As such, I was able to have them sell me two 1000 Newton columns and the associated controls.   Since I was already an established customer, I was able to get an upgraded set of 2500 Newton columns and associated controls last year.

 

I do not think Linak sells to the general public.

 

Yours truly,

 

Jack

 

Jack Huerkamp

Jack's Astro Accessories, LLC

38388 Pine Street

Pearl River, LA 70452-5192

985-445-5063

mallincamusa@...

www.mallincamusa.com

30.37N  89.76W

 

All of us get lost in the darkness.
Dreamers learn to steer by the stars.

………………………………….Neil Peart

 

 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Don Anderson via groups.io
Sent: Tuesday, April 20, 2021 11:47 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] AP1100 park position question

 

Jack

Did Linak sell direct to you?

 

Don Anderson

 

 

On Tuesday, April 20, 2021, 09:36:40 p.m. MDT, Jack Huerkamp <mallincamusa@...> wrote:

 

 

Christopher,

 

The company is Linak out of Kentucky and the columns I used were the DL2 2500 Newton rated.  My original ones were rated at 1000 Newtons each when used with a non AP mount.  With the AP1600 and 150# of equipment on the dual column setup, I changed to the 2500 Newton thrust each – 5000 Newton total thrust.

 

DL2: Robust lifting column for desks, workstations and kitchens (linak-us.com)

 

Yours truly,

 

Jack

 

Jack Huerkamp

Jack's Astro Accessories, LLC

38388 Pine Street

Pearl River, LA 70452-5192

985-445-5063

mallincamusa@...

www.mallincamusa.com

30.37N  89.76W

 

All of us get lost in the darkness.
Dreamers learn to steer by the stars.

………………………………….Neil Peart

 

 

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Christopher Erickson
Sent: Tuesday, April 20, 2021 10:09 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] AP1100 park position question

 

Lymax columns. A lot cheaper to buy Lymax off of Ebay or wherever and make your own telescoping pier.


-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

 

On Tue, Apr 20, 2021, 9:27 AM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:

Shailesh

I have used Park 4 for several years for exactly the roof height issues that you are evaluating.  This is for a 1100 mount with a 14 CDK scope.  There have been no problems.

I have a PierTech height adjustable pier (http://piertechinc.com/telescope-piers/).  When I need to tinker with equipment, I lower the mount and move it to P3, where it clears the roof. To remove equipment, I loosen the clutches (older style 1100) and rotate/lower the OTA to a separate support table before loosening the dovetail.  I normally leave the pier at almost max height, in order for the roof to clear on opening.

The adjustable piers are actually from another company, but I have forgotten the name.  I think Chris Erickson has these.

Bryan

 

Virus-free. www.avg.com


Re: bugs in my 1200!

Steven Panish
 

Thanks for the response Howard.  It was just 4 perimeter holes, as you thought.  I cleaned them out with about 50 Q-tips with soap solution and probed around until I got all the dirt out.  There was never any gritty sound like the Ded bearings were contaminated so I figured it was fine and reassembled with my new tandem saddle rig.  All is well.

Steve

On Thu, Apr 22, 2021 at 11:24 AM Howard Hedlund <howard@...> wrote:
Hi Steve,
Dave asked me to write the response.  I have attached a simple drawing in a PDF that he provided.  The good news is that the 6 perimeter holes are NOT through-holes.  The only 2 holes of possible concern are highlighted in the drawing.  I'm guessing they were covered by your plate.  For cleaning the holes out, he suggested using a 1/4-20 tap.


Time issues?

Pete Mumbower
 

Is it me or does time slow down the day you are waiting for the brown truck to deliver your new mount (1100GTO)?


Re: APPM model how many points portable?

Dean Jacobsen
 

I have been using PlateSolve2 with SGP to do my APPM modeling for almost a year now and it only takes a second or two to solve with my laptop.  So, results can vary.  I use smallish detectors - ASI1600, ASI294MM, and ASI2600MC.  So I’m sure that is a factor.  I also use 1/2 frame with the ASI2600 which speeds things up.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


Re: APPM model how many points portable?

Roland Christen
 

Howe accurate is ASTAP? Less than 1 arc sec or?

Rolando



-----Original Message-----
From: Jim Grubb via groups.io <jimgrubb@...>
To: main@ap-gto.groups.io
Sent: Thu, Apr 22, 2021 10:34 am
Subject: Re: [ap-gto] APPM model how many points portable?

I have the 1100 with encoders and have found a very successful very quick workflow using ASTAP-SGP-APPM.  You can turn off blind solving and it will very quickly move to the next point if it fails.  This is useful as I have the same issue with my horizon map not being perfect.  When the scope is pointing at the trees or the house, it just fails and quickly moves onto the next point.  This only happens for me near the horizon.  ASTAP is by far the fastest solver I have used and usually solves in under a second so you can turn the "Max Solve Time" parameter way down and it will fail very quickly.  I currently have mine set at 10s and am sure I could lower it to 2 or 3 seconds with no issues at all.  You may need to do a blind solve when you first set up the scope before you begin the pointing run.  [Screenshot: APPM - Plate Solve Settings Page]

On to the topic of how many points.  If you are only going after one target in an evening, you can run a narrow line at the declination of the target you are going to be imaging.  I typically use two lines spaced close together.  Here is an example of an 88 point model which covers 7 degrees of declination.  I can run this model in 1/2 hour.  And this is overkill, way more points than needed.  [Screenshot: Pointmap 1 example]

If you pull back on the RA spacing and tighten up the dec so that it only runs a single line of points at the exact declination of your target, you could get this down to 27 points, which on my rig will run in about 10 minutes.  [Screenshot: Pointmap 2 example]

Good luck!
Jim

As you experiment with different spacing, you will start to get a feel for what works.

--
Roland Christen
Astro-Physics


Re: Best way to prevent dovetail saddle plate from sticking to the mount?

fernandorivera3
 

Wow I wasn't aware this could happen especially less than a month of the plate bolted on top 😳

Fernando


Re: 1200GTO servicing project notes

fernandorivera3
 

Mike- yes, correct it was the screw extractor I was talking about. Have not used one of those yet. 

Fernando


Re: GTOCP4 Caps

Ken Sablinsky
 

Either I'm really confusing myself, or the drawing I found was incorrect.  I found this on the Mauser website showing the "71" version is 19mm x 1, and the 31 version matched that.  Guess I should have measured my actual CP4 instead of relying on the drawings, darn it.  Plus, the 71 version still shows out of stock discontinued - maybe I'm looking at the wrong adapter?
https://www.mouser.com/ProductDetail/Hirose-Connector/RM15TR-C71?qs=%2Fha2pyFadujF6dwDSTFNgVUE%2FRNk7I0u0R6Fk%252BD%252B6mmqK1TJX8uIgQ%3D%3D


Re: 1200GTO servicing project notes

fernandorivera3
 

Dale thanks for commenting. I have a 1200 GTO that I bought brand new from AP in July 2009. No problems yet with delrin clutch plugs getting stuck or seized & hoping it stays that way 🤞

Fernando


Re: GTOCP4 Caps

M Hambrick
 

Hi Ken

The RM15TR-C(71) caps are the ones that will fit the larger diameter threaded connectors on the GTOCP4 that the Y-cable and Encoder cable attach to. I checked the website and the internal thread specifications for the RM15TR-C(71) and RM15TR-C(31) are different (see below). 

Be VERY careful if you try to screw the RM15TR-C(31) caps onto your GTOCP4 that you do not strip out the threads of the connectors. If they do not thread on very easily, don't try to force them. In fact, based on the drawings below I don't think I would try them at all. I measured the threads on my GTOCP4 and verified that they are M20 X 2 threads.

It is interesting that Mouser told you they are out of stock of the RM15TR-C(71) caps. I ordered three of them yesterday and they don't show to be backordered. I am on the Mouser web site now, and they are showing that they have 26 of the RM15TR-C(71) caps in stock. You can also try searching using the Mouser number 798-RM15TRDC71.

Mike

Here is the RM15TR-C(71) It has M20 X 2 internal threads. This is the correct cap for the connectors on the GTPCP4. 

 

Here is the RM15TR-C(31). It has M19 X 1 internal threads:


Re: 1200GTO servicing project notes

M Hambrick
 

I expect that both the Ryobi and Harbor Freight extractors both come from China, but there are degrees of badness. Since they are a well known brand, I expect that the Ryobi extractors are held to a higher standard than the ones from Harbor Freight.

As a policy I don't trust anything from China, but especially anything that requires reliable metallurgy like drills, taps, and screw extractors. All of these cutting tools have to ride knife edge between hardness and brittleness. American made cutting tools can still be had from companies like Morse, Union / Butterfield, Niagara, and Cleveland Twist Drill, but you are going to pay a lot more for them.

Mike


Re: 1200GTO servicing project notes

Dale Ghent
 

Ah, you left out the context in your reply so it was unknown what you were referring to.

The Ryobi bits worked well for me, so I can speak only for my experience. I used the #1 extractor to remove all 8 of the delrin plugs on the 1200GTO that I serviced. A few light taps with a hammer to first seat the bit and then turning with a tap wrench was all that was required. If you do not have a tap wrench then an adjustable wrench or vice grips can serve as an awkward stand-in. But if you have extractors, you should really have a tap wrench that fits them for them to work well.

This is not to say that Ryobi bits are the only ones that will work for this task, of course. In my case, they worked better than the other brand I had from Harbor Freight.

On Apr 22, 2021, at 12:28, fernandorivera3 via groups.io <fernandorivera3=yahoo.com@groups.io> wrote:

Dale it was a Ryobi item from Home Depot & the link was posted to the group maybe 10 days ago or so <yes it takes me a while to reply to messages due to heavy work schedule>. I believe the product was for removal of the delrin clutch plugs among other things, IIRC.

Fernando


Re: GTOCP4 Caps

Ken Sablinsky
 

Maybe I jumped the gun and ordered too quickly on Mouser yesterday.  They showed the larger cap was out of stock and also said obsolete.  They recommended a different cap, RM15TR-C(31) which seemed to have the same specs as far as I can tell.  Guess I'll find out!


Re: 1200GTO servicing project notes

fernandorivera3
 

Dale it was a Ryobi item from Home Depot & the link was posted to the group maybe 10 days ago or so <yes it takes me a while to reply to messages due to heavy work schedule>. I believe the product was for removal of the delrin clutch plugs among other things, IIRC.

Fernando


Best way to prevent dovetail saddle plate from sticking to the mount?

skester@...
 

I know I read this somewhere but can't find it now.  After only 3 weeks being attached the dovetail saddle plate had become very much stuck to the top of the Dec axis of my new 1100GTO.  What is the preferred method to prevent this from happening?  I assume some form of lubricant but not sure what would be best.

Thanks


Re: GTOCP4 Caps

ap@CaptivePhotons.com
 

Ah, perfect, when the mount is ready I will ask for one.

 

Mine will be kept inside when not in use, so plastic is likely to work fine.  But when in use it’s a heavy, heavy dew environment so covering unused ports is a goodness.

 

Thanks.

 

 

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of M Hambrick via groups.io
Sent: Thursday, April 22, 2021 11:59 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] GTOCP4 Caps

 

Hi Linwood

Actually, Astro-Physics offers a set of plastic covers for all of the connectors on the GTOCP4/5 and the mount motors. You will have to call them to order a set. The interest in the metal covers is because they are more durable, and they will stay put, but as a minimum you should get a set of the plastic ones. I think they run about $15.00.

Mike


Re: 1200GTO servicing project notes

M Hambrick
 

Fernando

Are you referring to the screw extractor ? Those are all very very tricky to use.

Mike


Re: GTOCP4 Caps

M Hambrick
 

Hi Linwood

Actually, Astro-Physics offers a set of plastic covers for all of the connectors on the GTOCP4/5 and the mount motors. You will have to call them to order a set. The interest in the metal covers is because they are more durable, and they will stay put, but as a minimum you should get a set of the plastic ones. I think they run about $15.00.

Mike


Re: APPM model how many points portable?

Jim Grubb
 

I have the 1100 with encoders and have found a very successful very quick workflow using ASTAP-SGP-APPM.  You can turn off blind solving and it will very quickly move to the next point if it fails.  This is useful as I have the same issue with my horizon map not being perfect.  When the scope is pointing at the trees or the house, it just fails and quickly moves onto the next point.  This only happens for me near the horizon.  ASTAP is by far the fastest solver I have used and usually solves in under a second so you can turn the "Max Solve Time" parameter way down and it will fail very quickly.  I currently have mine set at 10s and am sure I could lower it to 2 or 3 seconds with no issues at all.  You may need to do a blind solve when you first set up the scope before you begin the pointing run.  [Screenshot: APPM - Plate Solve Settings Page]

On to the topic of how many points.  If you are only going after one target in an evening, you can run a narrow line at the declination of the target you are going to be imaging.  I typically use two lines spaced close together.  Here is an example of an 88 point model which covers 7 degrees of declination.  I can run this model in 1/2 hour.  And this is overkill, way more points than needed.  [Screenshot: Pointmap 1 example]

If you pull back on the RA spacing and tighten up the dec so that it only runs a single line of points at the exact declination of your target, you could get this down to 27 points, which on my rig will run in about 10 minutes.  [Screenshot: Pointmap 2 example]

Good luck!
Jim

As you experiment with different spacing, you will start to get a feel for what works.

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