Jump to content
  • 0

Balance issue or bad ball bearing?


Question

I have been struggeling with my DDM 85 with incremental encoders.
I have been balacing the rig to the full extent, the yellow bars are lining up at the "1.6A" view, in almost every position.

But anyway, i get servo error almsot every time during a 5-6 hrs long session.

I have attached the log if anyone care to take a loko at it...

Some questions though - the "position" for each axis, is that Alt/az reported from autoslew? they look somewhat odd to mee as i was photographing the flaming star nebula at roughly 45 degree above horizon at the moment...

/Daniel

Utdrag från motorlogg 2021-01-04.txt

Link to post
Share on other sites

3 answers to this question

Recommended Posts

  • 0

What load is the mount carrying? These currents look high to me on both axes.

My DDM 85A carries an OTA and camera with a total weight of about 28kg - which is a relatively light load. Current on the DE axis is usually below 0.3A, and on the RA axis usually below 1.2A. The currents are dependent on load, however I do not know what the current vs. load curve is.

Mark

 

Link to post
Share on other sites
  • 0

Thanks for your reply.
The scope is a 10" astrograph, maybe 20kgs load total, so the weight is not an issue.
I do might have some radial balancing offset to look into.

Last night went OK though, just made a fine tuning of the balance, changing a small balance weight. and making a new high performance autotune.

I do how ever have a small difference in balance in different positions, i might take the rig down and play more with off set balancing.

I will read the other thread once again ;)

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
×
×
  • Create New...