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CGE Pro Declination "Play" Fixed

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#26 HowardK

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Posted 26 January 2011 - 06:54 AM

Wayne
stars look round to me in the M27 image.this was also before the DEC play was removed right?...........

It would make the mount feel more solid if there was no play yes... but I am not convinced that it affects the performance of the mount in any way with the play being there.....after all I have to physically rock the front of my OTA to get the play to show up (maybe 2mm of rocking motion evident)

sure would be great though if it just took the tightening of those 2 nuts to eradicate it,......but does not work for me...or for others who have a similar problem

#27 WayneJ

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Posted 26 January 2011 - 12:07 PM

Howard -- Yes, the M27 was taken before the declination play was fixed. I imaged with the C14 on the CGE Pro through a variety of cameras for nearly a year before I fixed the play last week. More examples are on the site linked in my sig. My primary focus is planetary work, though.

Since the encoder that tracks the position of the declination axis registers movement due to play just as it would due to the movement of the gears, it doesn't seem as though the issue affects GOTO performance or polar alignment. Long focal length tracking near the meridian at high declinations would probably be somewhat iffy though.

Wayne

#28 HowardK

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Posted 26 January 2011 - 03:47 PM

Thank you Wayne for chatting.......I am going to live with my Dec slop!

#29 LLEEGE

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Posted 26 January 2011 - 04:18 PM

Not me. It is not normal.

#30 HowardK

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Posted 26 January 2011 - 06:06 PM

Please do tell us lleege if you manage to fix your DEC slop.....if i can I will gladly follow any tios you provide....I agree it is not normal

#31 HowardK

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Posted 15 February 2011 - 06:55 AM

LLLEEGE several months have passed since we last heard from you.....please tell me....did you ever fix the DEC slop......is the problem that the worm just won't mesh tight with the worm gear?......i have the exact same problem and cannot cure it

#32 LLEEGE

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Posted 15 February 2011 - 07:53 AM

Jury is still out. The weather here in the NE is pretty poor from October to March. I get 3-4 nights in that span. The mount came back from C and I have had it out once. There is still some DEC play. When the skies clear, I'll give it a run through @2000mm to see how it does.

#33 HowardK

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Posted 15 February 2011 - 09:45 AM

Ok...lleege....i'll be looking for what you have to say


Clear skies soon to you

#34 LLEEGE

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Posted 15 February 2011 - 07:26 PM

Here are the results from some tests the other night. The Pec runs showed me a -1/+14 which is within the +/-9 spec. I wouldn;t call those numbers "high end" but the curve was smooth and guided out well. I did have to set the DEC aggressiveness pretty high in PHD,(200%)otherwise the mount would just drift off the chart. (I didn't critically align the mount, just a PA routine) The image was taken at ~630mm with a 4" refractor and was guided with a mini-borg 50. 20 x 5min subs with a Canon DSLR. (modded) The stars look good and I didn't lose any subs. Next time I'll push it to 2000mm with the AT10RC. This is where the true results will show. The image is uncalibrated so don't laugh.

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#35 HowardK

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Posted 16 February 2011 - 07:13 AM

so this image is fine .............this with the DEC slop...doesn't seem to do much harm then?

#36 LLEEGE

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Posted 16 February 2011 - 12:29 PM

Once I get good stars at a higher FL and a heavier load, I'll be happy. Just need to wait for the weather to cooperate.

#37 HowardK

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Posted 16 February 2011 - 02:19 PM

I understand

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