Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

Rihard

Eq5 + Dual Axis Motors Tracking Problem

Recommended Posts

Hi all,

Tonight I was attempting to image Saturn, but eventually Saturn faded away sidewise and I was unable to follow the planet in the RA axis. I then noticed that the box of the DEC motor was hitting the RA knob and wouldn't let it move any further!

This basically ruined my image session (the seeing was the best ever, so crispy and detailed regardless of the moon, the roofs and the LP!) but I was stuck in a pretty narrow balcony and wasn't easy to try anything else.

Is throwing away the DEC drive a good work around? I really hope to get another clear night to image Saturn before she sinks in the horizon for a good while!

Thanks in advance for any tip!

Clear Skies

Riky

Share this post


Link to post
Share on other sites

Suppose that it is a possible solution however the Dec motor should not interfere. So it sounds as if there is something wrong.

First thought would be that the motors are positioned wrongly so would drive incorrectly , the second is should the RA knob be there.

I assume the knob is to move the mount and should you have removed this when putting the motors in place. I would have thought that the idea was remove the manual adjustment and replace with motorised adjustment.

Share this post


Link to post
Share on other sites

Suppose that it is a possible solution however the Dec motor should not interfere. So it sounds as if there is something wrong.

First thought would be that the motors are positioned wrongly so would drive incorrectly , the second is should the RA knob be there.

I assume the knob is to move the mount and should you have removed this when putting the motors in place. I would have thought that the idea was remove the manual adjustment and replace with motorised adjustment.

Hi Ronin,

thanks for your reply.

I guess knob was not the right word in this case (English is not my first language and the dictionary gave me this word :p ) . In fact, the manual control knobs were removed when I added the motors, but there is that thing were you actually fit the knob in the RA axis that is still there sticking out, and that's the place were the DEC housing gets stuck at a certain point when tracking Saturn. I suppose the assembly of the motors is correct as I was able to track jupiter few weeks ago.

I might post a picture later :)

Clear Skies

Edited by TziuRiky

Share this post


Link to post
Share on other sites

Would a "meridian flip" not cure this . . . ?

There comes a point with Equatorial mounts when you have to unlock the clutches and swing the scope to the opposite side to prevent collisions between various components ,

It's usually the scope and tripod legs that cause problems but the motors on my EQ3-2 get in some strange positions at times.

  • Like 2

Share this post


Link to post
Share on other sites

I was thinking of either a meridian flip or (and I'm not sure about this) when you set up, put the ota facing the other direcion (turn it 180 degrees on the mount). just a thought?

  • Like 1

Share this post


Link to post
Share on other sites

As above, meridian flip was my first thought, I was imaging Saturn last night aswell with my 200p/EQ5 with no problems apart from NOT getting a decent image due to the xbox cam been naff (need to upgrade) although the seeing was fantastic & Saturn the best i've ever seen her.

Steve

  • Like 1

Share this post


Link to post
Share on other sites

Chalk up another vote for a meridian flip. I don't think it's that uncommon for parts of the scope and DEC axis to be in danger of fouling the mount if they're allowed to run forever. A meridian flip usually fixes that.

James

  • Like 1

Share this post


Link to post
Share on other sites

Thanks all for the replies!

I reckon I did read about this "meridian flip" before on SGL but I had no clue what it was about :p

I guess that will do the job :)

Clear Skies

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Brownthunder93
      Anyone have any idea where I can get a replacement counterweight bar/shaft for my EQ5 mount? 
    • By Astrid
      My 200P just arrived and oh my God... I have been trying to wrap my head around the mount for 4 hours.
      The manual didn't really help so I decided to go on youtube, but again, I didn't find any good and detailed videos so I decided to ask here if there is any video or perhaps blog post that might help me set up the mount. 
      Thank you very much! 
      *by the way, is the EQ5 supposed to have slow motion cables? I only got 2 knobs (not cables) and I'm not sure if there is something missing or not... sorry, this is the first time I've used a serious equatorial mount or telescope. 
      Thank you very much!
    • By steppenwolf
      Vixen Polarie Star Tracker with Vixen Quick Polaris Locator Compass in mint condition - For Sale.
      This mint condition Polarie Star Tracker and Vixen Polaris Locator Compass have only been used during the course of a review that I carried out for Vixen UK and will be supplied in their original boxes with manuals.
      This tracker is the ultimate in portable camera tracking mounts being lightweight yet manufactured to Vixen’s usual exemplary high standard and the additional Vixen Polaris Locator Compass makes polar alignment for wide field imaging quick and simple.
      The new price for the two items would be £399.00
      For sale at £195.00 delivered. Payment by bank transfer - WILL NOT SELL OUTSIDE UK.
      Polarie Star Tracker

       
      Vixen Quick Polaris Locator Compass


    • By lkimber
      I know it may be a bit of a long shot but I'm looking to buy a HEQ5 Pro mount or an NEQ6 Pro or something similar. Preferably belt driven but not necessary as can happily modify it. Please let me know if you have anything! Thanks.
    • By SteveBz
      Hi People,
      I have quite severe backlash, such that guiding assistant just gives up.  It seems to be about 11 secs in total, the one time GA came back with anything, but it's about 3-4 secs if I measure it by hand.  Here's some guiding.  Actually, it's worse when I'm dithering.

      So, I tried measuring the backlash with by counting and it's about 3-4 secs.  If I used PHD2 guiding assistant, mostly it fails, or it comes back with a very big number, like 11,350 msecs.
      I tried entering this:

      But then I got a see-saw mechanism, even when I dropped 8,000 to 3,000 it was the same.
      I've taken the motor off just now and looked at the grub/hex-screw mechanisms.  One hex-screw was loose, so I tightened it to hand tight and let the grub-screw off an eighth of a turn.  I'll look again this evening.
      I ran a three hour sequence of exposures on NGC6888 (with dither) and this is what I got on EVERY image.  Amazingly, they stacked nicely.

      So last night I ran without dither and it was mostly OK.  What I want is full dither, but to do that I need to deal with the backlash.
      Here's a photo of the motor and gears, most of the backlash seems to come from the top gear (ie the 12-tooth gear and its neighbour).  I guess the rest comes from the worm-gear:

      Does anyone have any suggestions? There doesn't seem to be a belt-mod for the EQ5 as far as I can see.  Maybe there are better Dec backlash compensation settings I could use.
      Thanks,
      Steve.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.