Date   

Re: A question about a AP155 EDFS with the 2.7" focuser

Andrew Arai
 

Dean,

I have been looking into the spacing of some of the older AP field flatteners. Many were configured for the Pentax 6x7 system. IN that case 86.5 mm is close to the 86.4 +/- 2.5 mm I thought was the correct spacing. I found this on an old thread that was forward from the Yahoo group into the AP User group).

Andrew


Re: What is the diameter and thread on the Pasil.4 polar scope?

Tom Blahovici
 

Hmm, since the mount comes from 2004 or so. I highly doubt that it is metric. So I have ordered a new gauge which has both and more measurement options 
Tom


Re: A question about a AP155 EDFS with the 2.7" focuser

Dean Jacobsen
 

On Sun, Jun 21, 2020 at 09:49 AM, Geert wrote:
I would prefer using the Moon to find the focal point, unless you want to set fire on a piece of paper :-)
 
Geert
Hey Geert, sometimes ya' just gotta live dangerously.  ;-)

Thanks Roland, I can work with that. 

--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: Mach2 power consumption #Mach2GTO

Worsel
 

"Could be more if the load is unbalanced and the mount has to work against the unbalance."


If I use my Powerwerx meter to measure the watts (more precision than amps) in moving E to W versus W to E and N to S versus S to N, how small should the difference in watts be for a suitable balance in each axis? 

Does the difference vary among mounts?  I have an 1100 (non-AE).

Bryan


Re: Mach2 power consumption #Mach2GTO

Roland Christen
 


So, what is the PEAK draw of the MACH 2 while in use AND if something goes wrong?  
The power supply is rated at 10 amps. The peak current draw at high slew rates (1800x) and both axes slewing can be as much as 5 amps. Could be more if the load is unbalanced and the mount has to work against the unbalance.

Powering other stuff can put spikes in the DC, so it's not a good idea to split the power from the mount supply to power things like dew heaters.

Rolando


-----Original Message-----
From: Rick Socarras <tgrick@...>
To: main@ap-gto.groups.io
Sent: Sun, Jun 21, 2020 8:37 am
Subject: Re: [ap-gto] Mach2 power consumption #Mach2GTO

Happy Fathers Day to Astro-Dads!

The Mach 2 AC/DC Power Supply terminates to  an Anderson Power Pole connector.  That Anderson Power Pole connector DOES NOT attach to the mount in ANY way.  Astro-Physics then provides an EXTENSION cable.  That extension cable then connects to the ANDERSON POWER POLE connection on one end.  At the END of that extension cable is the FEMALE HIROSE connector that connects to the CP5 control box.

I was following this question because my interest is creating a Y POWER POLE SPLITTER.  The idea is I would SPLIT the power to the Mach 2 AND then SPLIT the power to a STEP down transformer (24V to 12V)  for camera equipment.  I know I can do this I just was not sure of the PEAK amperage draw of the Mach 2?  So, what is the PEAK draw of the MACH 2 while in use AND if something goes wrong?  

Rick


Re: A question about a AP155 EDFS with the 2.7" focuser

Geert
 

I would prefer using the Moon to find the focal point, unless you want to set fire on a piece of paper :-)

Geert

Op zo 21 jun. 2020 om 18:42 schreef uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io>:

Aim it at the sun, then place a piece of white paper at the focus point and measure where it comes to focus. Should be somewhere around 8" from the fully racked in focuser back.

Rolando



-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Sat, Jun 20, 2020 9:32 pm
Subject: Re: [ap-gto] A question about a AP155 EDFS with the 2.7" focuser

I guess I could guesstimate the focal point by measuring 43” back from the front of the objective and then measuring how far it is from that point to the focuser barrel.
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: A question about a AP155 EDFS with the 2.7" focuser

Roland Christen
 

Aim it at the sun, then place a piece of white paper at the focus point and measure where it comes to focus. Should be somewhere around 8" from the fully racked in focuser back.

Rolando



-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Sat, Jun 20, 2020 9:32 pm
Subject: Re: [ap-gto] A question about a AP155 EDFS with the 2.7" focuser

I guess I could guesstimate the focal point by measuring 43” back from the front of the objective and then measuring how far it is from that point to the focuser barrel.
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: What is the diameter and thread on the Pasil.4 polar scope?

Robert Berta
 

I agree that practicing with your lathe will open a world of things you will be able to accomplish. I decided to get my lathe when I was quoted a very high cost to make a lens cell for a Zeiss flat field lens for my 6" APO refractor. I probably put as much into the lathe as what it would have cost me for the custom part but than had a tool for future projects. That was about 15 years ago and I figure I have saved many times over custom building one off projects for astrophotography and race cars since than....for myself and friends. Luckily I already knew how to use the lathe and milling machines from my original high school and college classes where I was going to be an industrial arts teacher. That never happened as I became an electrical engineer....but those were valuable skills I learned. I consider that lathe to be my most valuable tool....it gets used a lot!


Re: Mach2 power consumption #Mach2GTO

Rick Socarras
 

Happy Fathers Day to Astro-Dads!

The Mach 2 AC/DC Power Supply terminates to  an Anderson Power Pole connector.  That Anderson Power Pole connector DOES NOT attach to the mount in ANY way.  Astro-Physics then provides an EXTENSION cable.  That extension cable then connects to the ANDERSON POWER POLE connection on one end.  At the END of that extension cable is the FEMALE HIROSE connector that connects to the CP5 control box.

I was following this question because my interest is creating a Y POWER POLE SPLITTER.  The idea is I would SPLIT the power to the Mach 2 AND then SPLIT the power to a STEP down transformer (24V to 12V)  for camera equipment.  I know I can do this I just was not sure of the PEAK amperage draw of the Mach 2?  So, what is the PEAK draw of the MACH 2 while in use AND if something goes wrong?  

Rick


Re: Do-it-yourself battery replacement in 'new' keypad vs have AP do it ? (Cost ?)

Michael Hamburg
 

Just replaced the battery of the hand of my AP900. Be careful; work slowly; be alert and it's simple.

;

On Sat, Jun 20, 2020 at 2:01 PM, uncarollo2
<chris1011@...> wrote:e
Call AP and they will tell you, depending on which keypad you have.

Rolando



-----Original Message-----
From: Mike Dodd <mike@...>
To: main@ap-gto.groups.io
Sent: Sat, Jun 20, 2020 12:31 pm
Subject: Re: [ap-gto] Do-it-yourself battery replacement in 'new' keypad vs have AP do it ? (Cost ?)

On 6/20/2020 1:17 PM, uncarollo2 <chris1011@...> via groups.io wrote:
> The batteries can be purchased from us, and they have the connector
> attached, so all you do is unplug the old battery and plug in the new one.

Cost? (Asked in the subject line.)

--- Mike






Re: Mach2 power consumption #Mach2GTO

Terri Zittritsch
 

On Sat, Jun 20, 2020 at 06:19 PM, uncarollo2 <chris1011@...> wrote:
The Mach2 power supply does not use Anderson power poles. It uses Hirose connectors. This 24 volt supply should never be used to power anything else, no matter how tempting. It is ONLY to be used to power the Mach2, nothing else.
 
Roland
 
Roland, is this a recent change?   Best I can tell the connector on the 24V supply I have is powerpole.    If not powerpole, it is a copy, and since this plugs into the power cord on the CP5, which also plugs into my battery box which I put powerpole on, I'm not clear what you're referring to.     


Terri



Terri


Re: What is the diameter and thread on the Pasil.4 polar scope?

R Botero
 
Edited

My 1963 Colchester Student lathe cuts both metric and imperial threads but most lathes of that age did not come equipped with such gearboxes. Modern lathes should cut mostly metric threads unless specifically ordered as imperial (which I assume will be the case for US customers). As Robert says, there are tricks to cut metric on imperial and viceversa. It’s all part of the learning curve if you are learning to machine on the lathe. You can use additional reduction gears - changewheels -on the back of the machine. For an old (1954) Boxford I had (identical to a Southbend), a single conversion gear on the back would allow me to turn 90% of metric threads with an 8tpi lead screw. 
See lathes.co.uk - the bible of all things to do with machining - for historic references and specifics about accessories. 
I feel you don’t need the adapter for your Pasil right away, try to make one! Turning on a lathe or milling is an addictive a hobby as visual/imaging amateur astronomy. 
If you are in desperate need of one, you can always click a button and buy it...
Roberto


Re: What is the diameter and thread on the Pasil.4 polar scope?

Robert Berta
 

Jumping in here.....I also have a larger metal lathe, milling machine, etc.in my home shop.  Your mini lathe is setup for ASA screw sizes and it does this with  a lead screw that allows the appropriate settings for those type of screws which are spec'd by TPI.. Cutting Metric threads can't simply be done on a mini lathe without some fiddling around and cheating. Either changing out gear ratios and/or changing to a metric lead screw is required which I doubt your mini lathe has that option. Repeating to get deeper cuts using the threading dial also won't work for metric as it isn't calibrated or sync'd for those type of metric screw pitches. There are ways to cheat to get it close but takes a lot of experience to get it right. Cheating also won't give the precision you need to make this project work.


Re: A question about a AP155 EDFS with the 2.7" focuser

Dean Jacobsen
 

I guess I could guesstimate the focal point by measuring 43” back from the front of the objective and then measuring how far it is from that point to the focuser barrel.
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: What is the diameter and thread on the Pasil.4 polar scope?

Christopher Erickson
 

However the various adapters that AP makes adapt the Kenko polar scope to the English threaded holes on various AP mounts. They make more than one bushing adapter. I don't know which one you have.


On Sat, Jun 20, 2020 at 4:02 PM Christopher Erickson <christopher.k.erickson@...> wrote:
The PASILL polar scopes are made by Kenko in Japan. Yes, metric threads.

On Sat, Jun 20, 2020 at 3:43 PM Tom Blahovici <tom.va2fsq@...> wrote:
Hi
Well it turns out that the diameter of the threads is very different than the Passil4 on the 900.  Which is strange...The diameter of the threaded part is 1.016 inches and the threading is not 24tpi.  My thread gauge goes from 32 then to 40 tpi and it is somewhere in the middle of that.  So I assume it is metric.
This is the losmandy polar scope which I believe comes from China and then adapted by AP.
So I guess I will need a metric thread gauge.
Tom


Re: What is the diameter and thread on the Pasil.4 polar scope?

Christopher Erickson
 

The PASILL polar scopes are made by Kenko in Japan. Yes, metric threads.


On Sat, Jun 20, 2020 at 3:43 PM Tom Blahovici <tom.va2fsq@...> wrote:
Hi
Well it turns out that the diameter of the threads is very different than the Passil4 on the 900.  Which is strange...The diameter of the threaded part is 1.016 inches and the threading is not 24tpi.  My thread gauge goes from 32 then to 40 tpi and it is somewhere in the middle of that.  So I assume it is metric.
This is the losmandy polar scope which I believe comes from China and then adapted by AP.
So I guess I will need a metric thread gauge.
Tom


Re: What is the diameter and thread on the Pasil.4 polar scope?

Tom Blahovici
 

Hi
Well it turns out that the diameter of the threads is very different than the Passil4 on the 900.  Which is strange...The diameter of the threaded part is 1.016 inches and the threading is not 24tpi.  My thread gauge goes from 32 then to 40 tpi and it is somewhere in the middle of that.  So I assume it is metric.
This is the losmandy polar scope which I believe comes from China and then adapted by AP.
So I guess I will need a metric thread gauge.
Tom


Re: A question about a AP155 EDFS with the 2.7" focuser

Dean Jacobsen
 

Thanks Stuart.  Sounds good.  

I figure that having the camera in focus with the focuser barrel about 1” extended would be a good place to be.  So I was hoping to avoid that situation I am sure we have all been in where I am scrounging around for adapters in the dark trying to get a good spacing.
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: A question about a AP155 EDFS with the 2.7" focuser

Stuart <stuart.j.heggie@...>
 

Dean, without a rear element in the imaging train, I think you can put the darn thing wherever you want and just bring it to focus. If you have a FF or Reducer/Flattener in play, they only deliver their promise at the precise distance to the chip. No flattener, no issue. Pretty sure.

Stuart Heggie (who has an AP155EDF w FF and 155TCC)


On Sat, 20 Jun 2020 at 19:58, Dean Jacobsen <deanjacobsen@...> wrote:
OK, now I am hearing from the scope's owner that the 86.5 number is the spacing for the flatener - which I do not anticipate that we will need with a 4/3" sized detector (the same size as a 8300 CCD).  

How far back should I set the camera detector from the back of the focuser barrel to be able to have some reasonable in and out travel of the focuser?
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


--

Stuart
http://www.astrofoto.ca/stuartheggie/


Re: A question about a AP155 EDFS with the 2.7" focuser

Dean Jacobsen
 

OK, now I am hearing from the scope's owner that the 86.5 number is the spacing for the flatener - which I do not anticipate that we will need with a 4/3" sized detector (the same size as a 8300 CCD).  

How far back should I set the camera detector from the back of the focuser barrel to be able to have some reasonable in and out travel of the focuser?
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 

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