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Mach2 with CP five jiggling while tracking
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Allen Ruckle
Roland,
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My mount is at our dark sky site 55 miles East of San Diego. We don’t have easy access to the WiFi at this site, but I usually can use a hotspot from my phone. I have Cellular service on my iPad that is a much better connection but cannot tether from it. Can you access the mount from the iPad Web Browser using the CP5 WiFi connection, or would you need to access the CP5 via the ASCOM Driver or APCC? Allen Ruckle
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Roland Christen
It would be great if we could patch into your mount at some point, at your convenience. Can be during the daytime indoors.
Roland
-----Original Message-----
From: Allen Ruckle <aruckle@...> To: main@ap-gto.groups.io Sent: Sun, Dec 5, 2021 9:06 am Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking Rolando.
I was unable to enter the command you sent until December 1st. That evening after entering it the mount performed without the jiggling issue for about three hours. It began jiggling again when I pointed the scope to the South East on the ecliptic at IC434. I adjusted the counterweights to add some offset East and the mount jiggling issue stopped. There was no further problems as I also imaged M42 and NGC 2244. Allen -- Roland Christen Astro-Physics |
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Allen Ruckle
Rolando.
I was unable to enter the command you sent until December 1st. That evening after entering it the mount performed without the jiggling issue for about three hours. It began jiggling again when I pointed the scope to the South East on the ecliptic at IC434. I adjusted the counterweights to add some offset East and the mount jiggling issue stopped. There was no further problems as I also imaged M42 and NGC 2244. Allen |
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Roland Christen
Yes, we are working on something like that for all our encoder mounts, including the 1100 and 1600 mounts.
Rolando
-----Original Message-----
From: Brent Boshart <bboshart@...> To: main@ap-gto.groups.io Sent: Thu, Nov 11, 2021 9:19 am Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking It might be nice if a future version of APCC had a slider control for encoder dampening (for each axis) as I frequently switch back and forth with a lighter and a heavier scope.
-- Roland Christen Astro-Physics |
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Roland Christen
I sent you instructions in a separate e-mail that will fix this.
Rolando
-----Original Message-----
From: Allen Ruckle <aruckle@...> To: main@ap-gto.groups.io Sent: Thu, Nov 11, 2021 9:16 am Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking Roland,
Here is a bit of information, from just before I had the issue with the oscillation of the mount tracking, I rebalanced the mount to eliminate all imbalance. However the oscillation did not start immediately, but about an hour and a half later.
aruckle -- Roland Christen Astro-Physics |
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Roland Christen
?
-----Original Message-----
From: Allen Ruckle <aruckle@...> To: main@ap-gto.groups.io Sent: Thu, Nov 11, 2021 12:07 am Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking Roland,
Here is an image with the results from accessing the mount with APCC to get the list of values requested, hopefully you have previously solved the issue. I have a C14 with HyperStar and Mirror less Canon RP. Thank you for your help.
PS I used the mount and telescope tonight controlling everything with my ASIair Pro. aruckle -- Roland Christen Astro-Physics |
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Brent Boshart
It might be nice if a future version of APCC had a slider control for encoder dampening (for each axis) as I frequently switch back and forth with a lighter and a heavier scope.
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Allen Ruckle
Roland, Here is a bit of information, from just before I had the issue with the oscillation of the mount tracking, I rebalanced the mount to eliminate all imbalance. However the oscillation did not start immediately, but about an hour and a half later. |
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Allen Ruckle
The attachment apparently didn’t get attached,
maybe this time. aruckle 
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Allen Ruckle
Roland, Thank you for your help. |
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>>>It is caused by a high inertial load on the mount (large heavy scopes with lots of counterweights) that needs a higher damping factor in the control loop. Simple adjustment in software really. I can vouch for that - Roland helped us with these settings on our CDK20 which is nearly 200lb on our AP1600. A few software tweaks improved performance considerably
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Roland Christen
No, it is not SDE that is causing this. The Mach2 and our other encoder mounts do not have SDE. It is caused by a high inertial load on the mount (large heavy scopes with lots of counterweights) that needs a higher damping factor in the control loop. Simple adjustment in software really.
Roland
-----Original Message-----
From: Clayton Yendrey <cyendrey@...> To: main@ap-gto.groups.io Sent: Wed, Nov 10, 2021 8:46 am Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking Roland,
I don't have an AP mount (on the waiting list for a Mach2), but this sounds very similar to the SDE generated oscillation that has plagued Ioptron's attempt at encoder equipped mounts. The threads on their issue with this on CN are so numerous that it really deserves its own group... ;-)
Is that any relation to what is occurring here?
"Sub-divisional error is cyclic, occurring with each interval of the scale or scanning pitch (i.e with each signal period), but it does not accumulate and is independent of the scale or travel length. The two primary causes of SDE are mechanical inaccuracies and misalignment between the scale and the read head, although harmonic disturbances can also cause distortions in the sine and cosine signal"
-- Roland Christen Astro-Physics |
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Roland, I don't have an AP mount (on the waiting list for a Mach2), but this sounds very similar to the SDE generated oscillation that has plagued Ioptron's attempt at encoder equipped mounts. The threads on their issue with this on CN are so numerous that it really deserves its own group... ;-) Is that any relation to what is occurring here? "Sub-divisional error is cyclic, occurring with each interval of the scale or scanning pitch (i.e with each signal period), but it does not accumulate and is independent of the scale or travel length. The two primary causes of SDE are mechanical inaccuracies and misalignment between the scale and the read head, although harmonic disturbances can also cause distortions in the sine and cosine signal" |
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Roland Christen
Please send me any information about your mount to chris1011@.... That way it won't get lost on this user group. Also include George@...
Roland Christen
Astro-Physics Inc.
-----Original Message-----
From: Jeffc <jeffcrilly@...> To: main@ap-gto.groups.io Sent: Mon, Nov 8, 2021 10:46 pm Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking Roland - Earlier (about a month ago) I replied with some output from mount commands you asked for. I’m guessing that thread may have been lost in the noise or spam.
In any event here’s the data I extracted for those terminal commands… let me know if you need additional info.
Thx
Here's the output of the terminal commands:
$RS# = 10#
$RA# = 40#
$RN# = 8#
$RZ# = 0#
Also copied as a screenshot attached.
-jeff
 -- Roland Christen Astro-Physics |
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Jeffc
Roland - Earlier (about a month ago) I replied with some output from mount commands you asked for. I’m guessing that thread may have been lost in the noise or spam.
In any event here’s the data I extracted for those terminal commands… let me know if you need additional info. Thx Here's the output of the terminal commands: $RS# = 10# $RA# = 40# $RN# = 8# $RZ# = 0# Also copied as a screenshot attached. -jeff  |
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Roland Christen
Were you able to use APCC for the info?
Roland
-----Original Message-----
From: Allen Ruckle <aruckle@...> To: main@ap-gto.groups.io Sent: Mon, Nov 8, 2021 8:59 pm Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking Thank you Roland for your response to my post.
-- Roland Christen Astro-Physics |
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Allen Ruckle
Thank you Roland for your response to my post.
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Roland Christen
I will send you some instructions to eliminate the oscillations.
By the way, has nothing to do with PHS2 or any other outside programs attached to the mount.
Roland Christen
Astro-Physics Inc.
-----Original Message-----
From: Allen Ruckle <aruckle@...> To: main@ap-gto.groups.io Sent: Mon, Nov 8, 2021 3:25 pm Subject: Re: [ap-gto] Mach2 with CP five jiggling while tracking I have attached a image taken of the Veil nebula taken while the mount was jiggling in the RA axis. The length of exposure was 75 seconds and, the focal length of the telescope is 674 mm.
therefore the amount of jiggle (length of star streak) is 2min 45sec of arc. The telescope was visually oscillating at a frequency of about 60hz. The only change, I think, has changed from the previous use of the imaging system may be an update of the PHD-2,6dev2 app. My next step is to revert the PHD-2 app to the previous version. -- Roland Christen Astro-Physics |
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Allen Ruckle
I have attached a image taken of the Veil nebula taken while the mount was jiggling in the RA axis. The length of exposure was 75 seconds and, the focal length of the telescope is 674 mm.
therefore the amount of jiggle (length of star streak) is 2min 45sec of arc. The telescope was visually oscillating at a frequency of about 60hz. The only change, I think, has changed from the previous use of the imaging system may be an update of the PHD-2,6dev2 app. My next step is to revert the PHD-2 app to the previous version. 
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Brent Boshart
I had/have the same issue with my Mach2. Roland sent me some APCC commands to help dampen the encoders. It affected both axes for me. I thought it was totally solved but have since seen some remaining "judder" after a fast slew - I need to make further adjustments with commands. It takes up to 30 seconds to settle. This is with a C8 mounted so no where near the limit of the Mach2. Before the APCC commands, it took a while to even settle after a dither while tracking.
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