Jump to content


Photo

Mechanical problems anyone?


  • Please log in to reply
3 replies to this topic

#1 pesa

pesa

    Member

  • Beta Tester
  • 82 posts
  • LocationEnköping Sweden

Posted 30 September 2016 - 02:08 PM

Hi

 

I wonder if any of you ever had any mechanical problems with your DDM60?

I have this weird behaviour that I cant find any (other) cause for:

synch

move DEC (say 15-20 degrees) with button in autoslew (N or S button)

synch

Now DEC-error is 0.1' (DEC-error is always very small also for MLPT and slew) but RA-error is usually 2-3 '. What!! I didn't touch rec.

I cant find any explanation for this.

If model is bad, wouldn't that affect DEC-error as well?

 

So I wonder if I have a mechanical problem in mount (ex: encoders loose).

If so, it might explain the long exposure problems I have had from the start.

If the problems where in pier or tube why would always DEC-error bli much smaller than RA-error?

 

 

 

pelle



#2 maxmirot

maxmirot

    Member

  • Beta Tester
  • 223 posts

Posted 30 September 2016 - 02:50 PM

See my thread about RA axis going bad.  My RA error is about 8x worst than DEC. It has got worse over the last few weeks. It was 2-3x worse in RA.

 

I can find nothing loose and I have a extremely rigid scope and focuser.  It is an AP Honders and Gemini focuser.  ASA is telling me it likely hysteresis. Not likely the mount. I am not convinced. Why would it effect the RA much more?

 

 

http://forum.astrosy...axis-going-bad/



#3 maxmirot

maxmirot

    Member

  • Beta Tester
  • 223 posts

Posted 30 September 2016 - 02:51 PM

What scope are you using.

 

Max



#4 pesa

pesa

    Member

  • Beta Tester
  • 82 posts
  • LocationEnköping Sweden

Posted 30 September 2016 - 05:47 PM

Max,

my scope is ASA N10.

I have extremely rigid pier. As far as I can tell also scope, focuser and optics.

I cant either understand how it could be flex, if that where the case shouldn't one get DEC-error > REC-error on other positions. After all it's gravitation that causes flex and what axis is most affected depends on the scopes orientation.

That is IF the flex is from tube or optics, the other candidate is flex in the mount itself obviously. That would explain why REC-error is always bigger, much bigger in my case.

 

pelle






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users