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By the way, is it possible that you have PE correction turned on and you are playing back some bad data? We had this happen once on a mount at the Mauna Kea visitor center. Someone had manually entered a huge correction curve into the PE memory and was playing it back. Caused the mount to jump every worm cycle.
If this is not the case, then the mount needs to be sent in for evaluation. I can look
at it the moment it arrives. Also send the cables and CP
controller too, in case something is weird there.
From: Ron Kramer <ronkramer1957@...>
Sent: Fri, Jun 19, 2020 10:02 am
Subject: Re: [ap-gto] Mach1 problem please assist
Next night - I'll do a 2-3-4 worm cycle unguided. I also may have one in a older log. I'll work on that.
One other thing that would be extremely helpful is if you ran the mount for about 2 worm cycles (about 15 minutes) with guiding effectively off so i can see what the worm is actually doing. Posting a guided graph hides a lot of stuff that makes it hard to do actual trouble shooting.
From: Ron Kramer <ronkramer1957@...
Sent: Thu, Jun 18, 2020 5:57 pm
Subject: Re: [ap-gto] Mach1 problem please assist
I'll post then then try groups interface.
I logged out my best guess on each incursion. There are no seconds so I had to estimate.
This would be the later set of errors that kicked UPWARD
about 12:38.55 sec
about 12:45.20 sec
about 12:51.50 sec
about 01:23.50 sec
about 01:30.15 sec
looks like they're spaced 6 min 20 seconds about. That's about a worm repeat?
On Thu, Jun 18, 2020 at 6:50 PM Liam Plybon <liam@...
I believe you may have better luck by using an image hosting server and posting a link.
Groups is set to compress images automatically after complaints by users with slow or expensive internet who would have to download large images each time one was sent on the
group. Especially here, where we all love sharing massive astro-images that can gobble up bandwidth.
Yep - one continuous run. Not near the meridian. I'm attaching pics in email. It asks original, best fit etc. Upon appearing it's a small little blurry version.
would it make them more clear if I enter the post in the groups interface and not in email? These are BIG ANC CLEAR AND SHARP when I attach them.
dental in shape when zooming in.
The graph shows 7 RA motions in the down direction, then a number of RA moves in the opposite direction. Is this over a period of time continuously? In other words,
was this graph taken without interruption?
Capture is CLEAR and sharp. not sure what "GROUPS" does to images. I hate GROUPS. Forums are better and allow you to retain/library of topics and Q&A,
I'll attach it again. Is there a limit? size? restriction? I'll attach at ORIGINAL SIZE
I don't own use a keypad. I did try that SWAP OVER - but I then cleaned it and not sure where it ended up. Since the last test clearly had the saime KICKS. I can do ig again.
What does that do? I think it might track toward the other side of the groove? I'll swap it over again and see if it helps since re-greasing.
NICELY - greasing lowered my RA RMA error almost 50%. Here is my history.
Mount arrived. I guided around 1.0. Always trying to tweak it - not sure why but months later I was guiding at .24 RMS error (arc set). yeah - that's awesome.
MANY months of that... The RASA guided better than my long APO. But late winter I swapped RASA V1 for a RASA V2 (heavier) and ever since my guiding was 1.5 average. My image scale is 1.69
lately - the RA kicks put me into 1.7-2.0. I get double stars on every other sub.
I re-greased the RA and last night afterwards I was 1.1max and usuall around .89 tot rms arc sec. (nice) But the RA still kicks and makes for double stars. My dec was still poor so I'll regrease dec next and check
my alignment. (it's fairly perminent in a dome, but I have a tripod leg/mount and it "can move". I usually check alignment 1-2 times a year or when ever guiding quality decreases.
I am not aware of any gear scraping - I always release it clean... I have on 3-4 occasions allowed it to track into a leg and (stop). Not sure if that hurts anything. But seems
to work fine next time.
I don't understand why the RA kick changed from lower to higher (E to W?) the mount orientation did not change.
I'll swap the part positions over and try again tonight. During regreasing/cleaning I saw nothing strange. No chunks or crud. old Grease moved quickly, freely. not at all gummy.
I have some pics n video.
Howard won't be able to answer you at this time.
Can you do a test for me?
With keypad in Autostart NO, send the mount to Park1 and turn off power.
Loosen the clutches and move the mount to Park5 manually.
Turn power back on and press "Resume from Park5"
Now check to see if the RA anomaly persists. let me know the results and we can go from there.
By the way, your screen shot is so blurry I cannot make out any details on it.
I re-greased the RA. It was really relaxing and nothing to fear. No springs jumped out at me or other crazy surprises.
The first test last night showed my RA improved by almost 50% reduction in RA RMS error. (I'm shocked).
On the bad side, I did not fix my RA KICK problem. I did not see RA worm flaws except on the very end (3 turns) of the worm and I'm sure that is never in contact with the drive gear.
I have emailed Howard... but wondered if it helps determine the problem from last night's guide log. I was surprised to see it FLIPPED the RA kick. (no meridian flip took place) why would it flip?
Kit arrived late last night. (UPS error)
Today it was hot in the dome so I just did the RA worm and drive gear. And the side gears)
I hope to test tonight and see if it solves my RA kicking problem.
I inspected the worm and was in fine shape - EXCEPT I had some very rough area which I don't think matters. It was way over on the very edges of the worm... like the last 2-3 turns were rough. I don't believe this are ever used?
I greased the entire worm even though it said just the center is all that's needed. Figured it would help ward off corrosion. The process wasn't scary once the RA box was removed. In fact (I don't recommend this) but I didn't even take my gear off the mount.
RASA 11 + essentials upside down at times. I forgot about the cords but never turned more than 180. I actually read the instructions after I was done. (common for me, I like to dig in) then see what I did wrong.
SOUNDS nice... Will see if the RA hiccups tonight in a guiding test. if all is good I'll do DEC tomorrow but RA was a primary concern as it would jump and killed every other sub.
Will see tonight.
On Wed, Jun 10, 2020 at 4:33 PM Marj Christen <marj@...> wrote:
Now that our production staff has returned, the turnaround time for repairs is pretty quick. There is no standard cost for a “ tune up” since it depends on what
is involved and if parts have to be replaced.
Try regreasing first and contact us again if you can’t resolve the issue.
I'm about to try to re-grease - I'll see if I can see something during inspection. Is swapping the worm something easy I can do at home?
I don't want to do anything complicated. I don't believe I've nicked a gear - I only use park3. But it has come against the pier during a few 3-4 occasions? Would that do anything?
How much does it cost to send it in for a tune up? HOW LONG would I be without it? I'm near in Grand Rapids, MI.
I'll look for a clump of anything in the worm teeth. If I send it in I don 't want it waiting for weeks/days. What is time frame?
I ordered the grease, I'll see how that goes.
Forget backlash in RA. There is no such thing. RA always tracks so it never reverses. Backlash does not enter into tracking.
You may have damaged your worm teeth when you backed off the worm to do a fine balance. You may have forgotten to do it only in the Park3 position. If that's the
case, the worm may have a nick in the teeth and it will show up as a repeating pattern once every 6.4 minutes.
My mach1 is about 2.5 years old. I was getting awesome guiding with a total rms error of .24 arc sec.
Winter came and went and this spring it's been horrible. like 1.4. My image scale is about 1.69 so I lived with that for a while, but lately
the RA is KICKING in almost a timely fashion. One of these kicks makes double stars. Around 1/2 my subs have to be deleted.
Nothing I have tried to far has fixed it.
I will include the log from a couple nights ago to show what I mean.
I did a new calibration - then a guide assistant for a while... then set recommendations and let it guide a while.
You'll see RA kicking like a mule in a rather evenly timed fashion!?!
I would so appreciate help with this. Someone in PHD said make sure the mount software/HC doesn't have backlash on.
I DO NOT USE or own a HC and I don't know of any BackLash setting in APCC pro. I'm going nuts.