Re: Mach1 problem please assist

Ron Kramer

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? 


On Wed, Jun 17, 2020 at 4:21 PM Ron Kramer via <> wrote:
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.


Clear Skies,


Marj Christen

Astro-Physics, Inc

11250 Forest Hills Rd

Machesney Park, IL 61115

Phone: 815-282-1513

Fax: 815-282-9847


From: [] On Behalf Of Ron Kramer
Sent: Wednesday, June 10, 2020 1:33 PM
Subject: Re: [ap-gto] Mach1 problem please assist


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.



On Tue, Jun 9, 2020 at 7:51 PM uncarollo2 <chris1011@...> via <> wrote:

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.






-----Original Message-----
From: Ron Kramer <ronkramer1957@...>
Sent: Tue, Jun 9, 2020 3:30 pm
Subject: [ap-gto] Mach1 problem please assist

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. 






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