New EQ6-R Pro Issue?

[AndyThilo]

Hi

Image below shows a phd graph, scale is +/- 4 on the y and 400 on x.

Graph shows what I believe is a mechanical issue as the RA spikes are evenly spaced. 
 
When I got the mount the DEC had a tiny bit of backlash which I removed. Both motors sound even when slewing full rotations. Any ideas? Should I just back off the RA worm gear a tiny amount? 
 

 

[knobby]

Can you check the time between spikes and then google the info, might show the end / start of a worm rotation etc ?

[Dinglem]

@AndyThilo they do look a bit regular to me so would point towards a mechanical issue.

[AndyThilo]

41 minutes ago, Dinglem said:

@AndyThilo they do look a bit regular to me so would point towards a mechanical issue.

My thoughts exactly, buts it’s far more regular than a full worm cycle

[wimvb]

3 minutes ago, AndyThilo said:

My thoughts exactly, buts it’s far more regular than a full worm cycle

Use phd log viewer to do a frequency analysis. Eg, a 120 s period would indicate the timing pulley on the RA motor. A 10 s period indicates a loose RA belt, etc. The log viewer can help. There’s a link to it on the phd web site.

[AndyThilo]

8 minutes ago, wimvb said:

Use phd log viewer to do a frequency analysis. Eg, a 120 s period would indicate the timing pulley on the RA motor. A 10 s period indicates a loose RA belt, etc. The log viewer can help. There’s a link to it on the phd web site.

Thanks I have it, I’ll have a look later

[AndyThilo]

Here's the graph, the RA oscillations occur every 8 minutes. Looking at documentation it points at periodic error? I've no idea how to cure it though. PHD2 log attached as well. The frequency anaylsis also below. 

PHD2_GuideLog_2020-11-22_162241.txt