Date   

Re: Backlash Adjustment in Mach1

Larry Phillips
 

I notice in the photo of Roland on the home page for this discussion
group that the gearbox design looks totally different than mine.

Larry

--- In ap-gto@yahoogroups.com, "Larry Phillips" <llp41astro@...>
wrote:

Hunter or anyone,
Roland' description of how to make the backlash adjustment for the
Mach1 has left me confused. I can not find two cover screws on the
top of the gearbox. I find three screws on the side which exposes
the reduction gears. On the bottom where the electrical connector
is
located there are two large allen screws. Are these the ones to
loosen? There are several other smaller screws that it looks like
I
would have to remove along with the large ones to "remove" any kind
of cover. I feel like I am looking at a different mount from the
one
Roland describes in the refenced message.

Larry

--- In ap-gto@yahoogroups.com, "hewholooks" <hewholooks@> wrote:

Have had my Mach1 for a couple months now and am very pleased.

Lately, due to break-in I assume, it has deleloped just a tiny
bit
of
backlash in both axes - not much, but it wasn't there to start
with.

I read message message 19854 ( http://tinyurl.com/5oktbn ) which
explains how to remove backlash in the Mach1. It worked
beautifully,
at least to my bare hand touch (haven't been out to test it at
night
yet, but I can feel no more clicking in the RA axis when I
manually
shimmy the axis).

After I did this proceedure, it suddenly hit me that I did the
adjustment with the mount fully loaded with about 40 pounds of
equipment.

Should I have done it with the mount empty, or is it OK to have
done
this fully loaded?

Thanks,

Hunter


Re: Backlash Adjustment in Mach1

Larry Phillips
 

Hunter or anyone,
Roland' description of how to make the backlash adjustment for the
Mach1 has left me confused. I can not find two cover screws on the
top of the gearbox. I find three screws on the side which exposes
the reduction gears. On the bottom where the electrical connector is
located there are two large allen screws. Are these the ones to
loosen? There are several other smaller screws that it looks like I
would have to remove along with the large ones to "remove" any kind
of cover. I feel like I am looking at a different mount from the one
Roland describes in the refenced message.

Larry

--- In ap-gto@yahoogroups.com, "hewholooks" <hewholooks@...> wrote:

Have had my Mach1 for a couple months now and am very pleased.

Lately, due to break-in I assume, it has deleloped just a tiny bit
of
backlash in both axes - not much, but it wasn't there to start with.

I read message message 19854 ( http://tinyurl.com/5oktbn ) which
explains how to remove backlash in the Mach1. It worked
beautifully,
at least to my bare hand touch (haven't been out to test it at
night
yet, but I can feel no more clicking in the RA axis when I manually
shimmy the axis).

After I did this proceedure, it suddenly hit me that I did the
adjustment with the mount fully loaded with about 40 pounds of
equipment.

Should I have done it with the mount empty, or is it OK to have
done
this fully loaded?

Thanks,

Hunter


Re: Backlash Adjustment in Mach1

Jeff Young <jey@...>
 

Hunter --

Won't make any difference as long as you're reasonably balanced (ie:
don't try it with 40 lbs of instruments and no counterweights).

-- Jeff.


________________________________

From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On
Behalf Of hewholooks
Sent: Saturday, May 03, 2008 10:03 PM
To: ap-gto@yahoogroups.com
Subject: [ap-gto] Backlash Adjustment in Mach1



Have had my Mach1 for a couple months now and am very pleased.

Lately, due to break-in I assume, it has deleloped just a tiny
bit of
backlash in both axes - not much, but it wasn't there to start
with.

I read message message 19854 ( http://tinyurl.com/5oktbn
<http://tinyurl.com/5oktbn> ) which
explains how to remove backlash in the Mach1. It worked
beautifully,
at least to my bare hand touch (haven't been out to test it at
night
yet, but I can feel no more clicking in the RA axis when I
manually
shimmy the axis).

After I did this proceedure, it suddenly hit me that I did the
adjustment with the mount fully loaded with about 40 pounds of
equipment.

Should I have done it with the mount empty, or is it OK to have
done
this fully loaded?

Thanks,

Hunter


Backlash Adjustment in Mach1

hewholooks
 

Have had my Mach1 for a couple months now and am very pleased.

Lately, due to break-in I assume, it has deleloped just a tiny bit of
backlash in both axes - not much, but it wasn't there to start with.

I read message message 19854 ( http://tinyurl.com/5oktbn ) which
explains how to remove backlash in the Mach1. It worked beautifully,
at least to my bare hand touch (haven't been out to test it at night
yet, but I can feel no more clicking in the RA axis when I manually
shimmy the axis).

After I did this proceedure, it suddenly hit me that I did the
adjustment with the mount fully loaded with about 40 pounds of
equipment.

Should I have done it with the mount empty, or is it OK to have done
this fully loaded?

Thanks,

Hunter


El Capitan Question

Steve... <astropix@...>
 

Hi Roland,

I've seen El Capitan at AIC last November and again last weekend at
NEAF. It's a very impressive hunk of "iron". I see that you now have
added external limit switches and am wondering about them.

If I understood you correctly at NEAF, you said that these switches
are intended for both limiting travel and for homing the mount to a
known position. Also I think you said they would not be integrated
into the mount's control box but would be used by external software.

So a couple of questions for respectful discussion:

1. While these switches would clearly work fine for limiting travel,
I am doubtful that they would provide sufficient accuracy for a
homing function. Do you intend them to be used for homing? Do you
believe they will have sufficient accuracy (ie. repeatability) for
that purpose? If they are just for limiting travel, how will homing
be accomplished?

2. The mount at NEAF only had these on the RA axis but I presume a
second set could be placed on the DEC axis. Is it your intent to put
them on both axes? I am not sure how limit switches would work for
homing (or even limiting travel) of the declination since the full
range of rotation is needed. How would they serve to home the
declination axis?

3. By not integrating these into the mount's control system, I think
there will be some issues for homing (if that's an intended function
for the switches). If the mount has been improperly synced, the
external computer will have no way to know which way to slew to reach
a particular switch. It will have to simply choose a direction and
slew until the limit is reached. Then it will know which side the
mount is on. The same will be true for the declination axis. So I
think there could be some situations where the slews of both axis can
cause the scope to hit the pier even though both RA and DEC are
within their limits. Am I mistaken in this?

To be honest, I was a bit surprised to see something other than a
protected (ie. inside the mount) optoelectronic device used for this
function. Also I was disappointed to see that there is no integration
with the control system (ie. no "GOTO Home" function).

Anyway, I'd appreciate your remarks on this. I am considering El
Capitan for a new observatory but I really feel I need a homing
function. Maybe I missed the point on these switches.

Thanks!

Steve...

www.CCDNavigator.com


Transitting exoplanet in Hercules

ayiomamitis
 

Dear group,

One of the latest exoplanet discoveries (2007) involves TrES-3 in Hercules. What is of
great interest surrounding this discovery is the exoplanet's proximity to its parent star and
its degenerative orbit. In other words, at some point this exoplanet will not be available for
study due to its orbit and impending collision into its sun.

What makes the photometry of this exoplanet most challenging is the fact that its host
star is very dim at magnitude 12.17 and the transit depth of 25 mmag translates to very
small changes in the overall dimness of the parent star during transit. I am delighted to
present you with a light curve for TrES-3 taken with a well-known 160 mm refractor
(LOL!) and which most beautifully illustrates the 105-minute transit.

I contacted a couple of individuals a priori surrounding this transit and I was told that it is
not possible in the slightest given the dim magnitude of the parent star, the transit depth
and my small aperture. Well, no pain, no gain.

For the light-curve in two-formats as well as a finder chart, I kindly direct you to
http://www.perseus.gr/Astro-Photometry-TrES-3-20080503.htm ...

There are additional exoplanet transits over the next few months and which I will certainly
be pursuing.

Clear skies!

Anthony.


Re: Mach1 and checking PASILL4 results

Pierre Henrotay
 

Hi Dean,

could you confirm that your model is effectively a PASILL4 (ie the
latest one, with engravings till 2030 and rotating housing) ?

Thanks !
Pierre
--- In ap-gto@yahoogroups.com, "Dean S" <dean@...> wrote:

Hi Pierre,

I managed to check the polar alignment scope tonight. After my
drift
alignment with Pempro, the polar scope is perfectly aligned with
all 3
stars.

What was unusual is, that when I looked thru the polar scope, it was
perfectly aligned without me even touching it. I doubt that would
happen
very often.

Dean


Re: Dec guiding jumps

 

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

In a message dated 5/2/2008 8:49:39 AM Central Daylight Time,
lupo.di.mare@... writes:


Dear group
I have maybe a problem here
i have a Ap 900 gto cp3 who guided flawless for 3 years now i am
noticing a strange behaviour in Dec axis
My setup is :
AP 900 GTO cp3 4.12 firmware version
Takahashi FSQ 106 N f5
Sbig STL 11000
I was shooting the Nord America nebula 30 min HA subframe and
after
calibrate the star whit the internal guide ccd the guide start
whitout problem but after 10 minutes the dec ais show a + 0.70 / -
0.70 pixel movement very fast ( 3second up 3 second down)
Before the mount was loaded whit a Celesron C9.25 and on the top
a
Penta sdhf 75 ,stl 11k and never noted the dec guiding jump
after got the FSQ i loaded the mount only whit it and noticed
this
behaviour
My guiding parameter are :
for both axes Calibrating time of 15 seconds
minimum move x-y axes 0.02 seconds
maximum move x-y axes 0.20 seconds
delay after correction 0.50 seconds
exposure for the guide star 3 seconds
backlash 0
guide rate 1x
agressivness a value of 8 on both axes
the seeing was ,whit HA filter 13 nm , 1.01 fwhm in maxim dl
all the cable are not tangling
the setup is well balanced with a digital fish scale
last week i redo the polar alignment with pempro last version as
well
as the pec training ( pec was 6.40 p.p and after the training was
+-
1 arcsec )
on the Keypad the mount was selected as 900 gto
no backlash adjustement on Dec o Ra
guide rate is 1
i have uploaded some screen shot in my folder showing the guiding
behaviour :
http://tech.ph.groups.yahoo.com/group/ap-gto/photos/browse/dfdb
Thanks for the kind support
My best regards
Giorgio
You may have set the backlash in the keypad. Please check to make
sure that
it is zero.

Rolando


**************
Wondering what's for Dinner Tonight? Get new twists on
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[Non-text portions of this message have been removed]
hi Rolando
thanks for the kind help
That was !!!
i've found the setting in dec bascklash set to 1
thanks again
My Best regards
Giorgio


Dec guiding jumps

 

Dear group
I have maybe a problem here
i have a Ap 900 gto cp3 who guided flawless for 3 years now i am
noticing a strange behaviour in Dec axis
My setup is :
AP 900 GTO cp3 4.12 firmware version
Takahashi FSQ 106 N f5
Sbig STL 11000
I was shooting the Nord America nebula 30 min HA subframe and after
calibrate the star whit the internal guide ccd the guide start
whitout problem but after 10 minutes the dec ais show a + 0.70 / -
0.70 pixel movement very fast ( 3second up 3 second down)
Before the mount was loaded whit a Celesron C9.25 and on the top a
Penta sdhf 75 ,stl 11k and never noted the dec guiding jump
after got the FSQ i loaded the mount only whit it and noticed this
behaviour
My guiding parameter are :
for both axes Calibrating time of 15 seconds
minimum move x-y axes 0.02 seconds
maximum move x-y axes 0.20 seconds
delay after correction 0.50 seconds
exposure for the guide star 3 seconds
backlash 0
guide rate 1x
agressivness a value of 8 on both axes
the seeing was ,whit HA filter 13 nm , 1.01 fwhm in maxim dl
all the cable are not tangling
the setup is well balanced with a digital fish scale
last week i redo the polar alignment with pempro last version as well
as the pec training ( pec was 6.40 p.p and after the training was +-
1 arcsec )
on the Keypad the mount was selected as 900 gto
no backlash adjustement on Dec o Ra
guide rate is 1
i have uploaded some screen shot in my folder showing the guiding
behaviour :
http://tech.ph.groups.yahoo.com/group/ap-gto/photos/browse/dfdb
Thanks for the kind support
My best regards
Giorgio


Re: Mach1GTO vs. 900GTO?

Dean S
 

I just got a Mach1 myself, have had my 1200 only 6 months but after WSP I
decided I wanted something easier to carry for shorter imaging trips.

The Mach1 feels so light even in one piece, I think because it is so easy to
grip, the shape gives plenty of natural handles to grab it. But still it is
waaaaayyyy easier than the 1200.

I ordered the short weight bar so I could use the standard size weights, but
found out for my set up that it is a bit too short and requires more weight
than a longer bar. So I ordered a 14" bar and hope the extra 4" will lower
the amount needed.

And so far after imaging only 1 object, it guides my little Epsilon 160 had
good as the 1200.

Dean

----- Original Message -----
From: "aposrule" <surpher@verizon.net>
To: <ap-gto@yahoogroups.com>
Sent: Friday, May 02, 2008 12:17 AM
Subject: [ap-gto] Mach1GTO vs. 900GTO?


I currently have two AP GTO mounts (900 & 1200) and am about to take
receipt of a
Mach1GTO. Is the latter that much easier to schlep than the 900?

After hauling the 1200, the 900 now seems pretty light.


------------------------------------

To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links




Re: Dec guiding jumps

Roland Christen
 

In a message dated 5/2/2008 8:49:39 AM Central Daylight Time,
lupo.di.mare@alice.it writes:


Dear group
I have maybe a problem here
i have a Ap 900 gto cp3 who guided flawless for 3 years now i am
noticing a strange behaviour in Dec axis
My setup is :
AP 900 GTO cp3 4.12 firmware version
Takahashi FSQ 106 N f5
Sbig STL 11000
I was shooting the Nord America nebula 30 min HA subframe and after
calibrate the star whit the internal guide ccd the guide start
whitout problem but after 10 minutes the dec ais show a + 0.70 / -
0.70 pixel movement very fast ( 3second up 3 second down)
Before the mount was loaded whit a Celesron C9.25 and on the top a
Penta sdhf 75 ,stl 11k and never noted the dec guiding jump
after got the FSQ i loaded the mount only whit it and noticed this
behaviour
My guiding parameter are :
for both axes Calibrating time of 15 seconds
minimum move x-y axes 0.02 seconds
maximum move x-y axes 0.20 seconds
delay after correction 0.50 seconds
exposure for the guide star 3 seconds
backlash 0
guide rate 1x
agressivness a value of 8 on both axes
the seeing was ,whit HA filter 13 nm , 1.01 fwhm in maxim dl
all the cable are not tangling
the setup is well balanced with a digital fish scale
last week i redo the polar alignment with pempro last version as well
as the pec training ( pec was 6.40 p.p and after the training was +-
1 arcsec )
on the Keypad the mount was selected as 900 gto
no backlash adjustement on Dec o Ra
guide rate is 1
i have uploaded some screen shot in my folder showing the guiding
behaviour :
http://tech.ph.groups.yahoo.com/group/ap-gto/photos/browse/dfdb
Thanks for the kind support
My best regards
Giorgio
You may have set the backlash in the keypad. Please check to make sure that
it is zero.

Rolando


**************
Wondering what's for Dinner Tonight? Get new twists on
family favorites at AOL Food.

(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)


Re: PASILL4 on Mach1, update

Pierre Henrotay
 

Hi,

I think the NCP is at the correct position as well.
I placed in the Files section, folder phenrotay, a file named:
smp_dscn_1.jpg
which shows the result.
It is the addition of a SkyMap bitmap (I added 2 lines to show the
NCP at their intersection) and a digicam pic, after alignment in
MaxIm.
The alignment was made on Polaris and delta UMi. OV Cep falls in
place, as does the NCP position.

I plan to retest the operator' skills (ie myself !) as soon as the
sky clears up. Might take a while...

Pierre

--- In ap-gto@yahoogroups.com, "Samir Kharusi" <samirkharusi@...>
wrote:

Hi again,
Your photos confirmed that the engraving for the stars was fine,
but
not whether the North Celestial Pole is shown at the correct
position. That is the critical one! For this you need to locate
where
the NCP is located in your software (for 2008!), mark it as a user
point in Skymap Pro, and then verify that it is indeed at the
location where all those lines in the reticle cross in the middle.
Hopefully you have not yet erased your reticle photos. Thereafter
you
will have full confirmation whether it is operator error or that
the
reticle is erroneous. There are two generations of reticles
currently
in use. It is possible that the older one is fully correct and the
newer one that you are using is erroneous. This could have happened
if, eg whoever drew the reticle had put in the NCP precessing in
the
wrong direction (mirror image). Mine is the older one, and it's
always possible that the above report confirming that the reticle
checked out fine after an independent/software polar alignment was
also the older reticle. Was it the older or the newer reticle?


Mach1GTO vs. 900GTO?

aposrule <surpher@...>
 

I currently have two AP GTO mounts (900 & 1200) and am about to take receipt of a
Mach1GTO. Is the latter that much easier to schlep than the 900?

After hauling the 1200, the 900 now seems pretty light.


Re: PASILL4 on Mach1, update

Muhammed Samir Kharusi
 

Hi again,
Your photos confirmed that the engraving for the stars was fine, but
not whether the North Celestial Pole is shown at the correct
position. That is the critical one! For this you need to locate where
the NCP is located in your software (for 2008!), mark it as a user
point in Skymap Pro, and then verify that it is indeed at the
location where all those lines in the reticle cross in the middle.
Hopefully you have not yet erased your reticle photos. Thereafter you
will have full confirmation whether it is operator error or that the
reticle is erroneous. There are two generations of reticles currently
in use. It is possible that the older one is fully correct and the
newer one that you are using is erroneous. This could have happened
if, eg whoever drew the reticle had put in the NCP precessing in the
wrong direction (mirror image). Mine is the older one, and it's
always possible that the above report confirming that the reticle
checked out fine after an independent/software polar alignment was
also the older reticle. Was it the older or the newer reticle?

--- In ap-gto@yahoogroups.com, "phenrotay" <Pierre.Henrotay@...>
wrote:

Hi Samir,

thank you for the tip, looks like a good idea.

I just did so, but not using TheSky which I do not have:
- in SkyMap Pro, I made a map of the area next to the North Pole
(about 15 degrees wide) and saved it as bitmap
- I took a photo in daytime thru the polar scope against a white
background; easy with my digicam
- I used MaxIm to align the map and the photo (plain translate,
rotate and scale) using 2 stars as alignment: Polaris and delta UMi
- added both images with 50% intensity each

The result is that OV Cep ends up at the right place as well.
The conclusion is that the reticle is fine. BTW, I rechecked that
it
is centered by taking 4 pics thru the polar scope, with a distant
object as target, each pic differing from previous by 90 deg: all
fine, centering is OK.


Re: DEC Backlash and RA "Drift" on AP1200GTO

Jim S.
 

Hi Roland,

I can't speak for Maxim, but CCDSoft "knows" the binning state of the
guiding chip and will adjust the speeds accordingly. E.g., if one
calibrates 1x1 and then guides 2x2, CCDSoft will automatically adjust
the speeds to account for the resulting change of guiding image scale.
Further, if one decides to enter his own values into the Motion
fields in CCDSoft, for whatever reason, he MUST do so as if the
guiding chip was binned 1x1 regardless of how the guiding chip will
actually be set (1x1, 2x2, or 3x3) while guiding.

Any thoughts on my post which started this thread? --

http://tech.groups.yahoo.com/group/ap-gto/message/21815

JS



--- In ap-gto@yahoogroups.com, chris1011@... wrote:

If you guide at 1x1, then calibrate at 1x1. If you guide at 2x2
binned, you
must also calibrate at 2x2, or simply take your 1x1 values and cut
them in
half.

Rolando


Re: Some pictures updated

Roland Christen
 

In a message dated 4/28/2008 1:54:21 AM Central Daylight Time,
marcolorenzi70@yahoo.it writes:


Dear all, I eventually found little time to update my home page with 8 new
shots. They all were taken with my worthy 900GTO

The direct links to the images and the preview is accessible here
http://astrosurf.com/lorenzi/lastupdate.htm

All shots were made using my STL11K (now sold) and relative to the following
objects:

M 51 the Whirlpool Galaxy, one of my preferred objects (Vixen Visac 20cm
f/9)

M106 Another nice galaxy, quite extended (Vixen Visac 20cm f/9)

M65/66/NGC3628 The popular Leo Triplet (Vixen Visac 20cm f/9)

M97/M108 The intriguing Owl Nebula and its neighbour galaxy (Vixen Visac
20cm f/9)

M1 The Crab Nebula (Vixen Visac 20cm f/9)

M78 A charming reflecting nebula in Orion (Vixen Visac 20cm f/9)

NGC2264 The Christmas three and its jewels (Tec140)

M42 The Great Orion Nebula, this picture made with data from both the TEC140
and the Visac to increase core details

Comments and critics are welcome
All very impressive images.

Rolando


**************
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Re: PASILL4 on Mach1, update

Pierre Henrotay
 

Hi Samir,

thank you for the tip, looks like a good idea.

I just did so, but not using TheSky which I do not have:
- in SkyMap Pro, I made a map of the area next to the North Pole
(about 15 degrees wide) and saved it as bitmap
- I took a photo in daytime thru the polar scope against a white
background; easy with my digicam
- I used MaxIm to align the map and the photo (plain translate,
rotate and scale) using 2 stars as alignment: Polaris and delta UMi
- added both images with 50% intensity each

The result is that OV Cep ends up at the right place as well.
The conclusion is that the reticle is fine. BTW, I rechecked that it
is centered by taking 4 pics thru the polar scope, with a distant
object as target, each pic differing from previous by 90 deg: all
fine, centering is OK.

I must be doing something wrong when using the polar scope itself,
but yet wonder what. Especially since for the last test, we were two
guys to crosscheck what we were doing.

Need further clear nights to retest... unfortunately no clear skies
forecast for the next days/weeks.

So the status so far: operator error ?

Pierre
--- In ap-gto@yahoogroups.com, "Samir Kharusi" <samirkharusi@...>
wrote:

At least from what you have drawn, the indication is that the
magnification is correct. It is thus fairly simple to verify that
the
reticle is correctly engraved or not. Take a photograph, daytime
against a clear sky or a white sheet of paper, through the polar
scope. Just try various lenses on a digicam or dslr holding the
lens
against the eyepiece. Something always works well enough. Match up
your photo, ie using Image Link, with The Sky. My old version of
The
Sky did not show the location of the North Celestial Pole, but I
added it in as a user point. Be careful that you put it in for
2008!
The error in the sketch does seem to be too large to be blamable on
atmospheric refraction, IMHO, and if it is indeed in error,
Losmandy
should be able to produce corrected reticles fairly quickly.


Re: Mach1 and checking PASILL4 results

Pierre Henrotay
 

Hi Dean,

lucky are you ;-)

Thank you for these test reports. This indicates that I have a
particular problem with mine - or, not to be excluded yet, that I
repeatedly did something wrong (but in my last tests, we were 2).

I need some more clear night(s) to recheck what is going on here;
unfortunately there is little hope for this in the very near future.

What I rechecked so far:
- the polar scope reticle is centered on the optical axis of the
polar scope
- the polar scope optical axis is aligned with the RA axis of the
mount (well, not mine, but an AP900GTO)
- the magnification of the polar scope is fine (I compared with a
previous model, unfortunately this is not suitable for the Mach1 as
it is non rotating)
- the engravings are OK (I followed a suggestion made on this list to
take a pic thru the polar scope with a digicam and check for
alignment with a map of the North Pole area - I did the map with
SkyMap Pro and used MaxIm to align with my pic - 2 stars align, no
centroid use): all 3 "stars" fall nicely in place where expected

So I am puzzled.

Is there a chance that I constantly mistake one star for another ? I
have a doubt on the position of what I assumed to be OV Cep. I'll
redo my checks just using Polaris and delta UMi.

Thanks again anyway !

Pierre
--- In ap-gto@yahoogroups.com, "Dean S" <dean@...> wrote:

Hi Pierre,

I managed to check the polar alignment scope tonight. After my
drift
alignment with Pempro, the polar scope is perfectly aligned with
all 3
stars.

What was unusual is, that when I looked thru the polar scope, it was
perfectly aligned without me even touching it. I doubt that would
happen
very often.

Dean


Re: DEC Backlash and RA "Drift" on AP1200GTO

Roland Christen
 

In a message dated 4/27/2008 3:04:26 PM Central Daylight Time,
reseavey@verizon.net writes:


In paragraph 2), it seems to say that one has to calibrate the guider with
the binning set to 1x1. I don't believe that is true.
If you guide at 1x1, then calibrate at 1x1. If you guide at 2x2 binned, you
must also calibrate at 2x2, or simply take your 1x1 values and cut them in
half.

Rolando


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Re: Focuser Backlash

Roland Christen
 

In a message dated 4/27/2008 10:41:12 AM Central Daylight Time,
llp41astro@cox.net writes:


After using FocusMax with my new AP 140 4" focuser using a FeatherTouch
motor, I am wondering if there is anyway to adjuct the focuser backlash.

Larry
Make sure that the 4 mounting screws on the bottom of the pinion block are
fully tightened. They may have loosened during shipping due to vibration. Next,
remove the large focuser knob and snug up the 2 small set screws on the side
of the pinion block until the block does not move any more when the focus is
moved back and forth. Finally, snug up the two black Delrin screws on the bottom
side of the focuser body.

Roland Christen


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