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  #21  
Old 12-07-2018, 05:53 PM
alval (Alan)
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Hey Andrew

This is the dec drive. The gear is about 82mm in diameter and the worm is about 13mm from what i recall. The RA drive is slightly larger. Got other photos but have to reduce their size to up load it seems.

Cheers Alan
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  #22  
Old 12-07-2018, 08:11 PM
AndrewJ
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Gday Alan
That is VERY different to the older models.
The much larger dia wormwheel wil make it much more stable than the old units that had a tiny wormwheel.

At a rough count, the wormwheel has 78 teeth ( vs the 60 for a std ETX125), but the gearbox is also very different.
Would need to count all the teeth in the geartrain to see how they re engineered it to give the same final ratio.
Again, if it aligns and points well, then the ratios are correct, so its more likely they changed a few gear teeth counts to keep it the same.
Andrew
so what does the RA look like
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  #23  
Old 12-07-2018, 08:30 PM
alval (Alan)
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RA from top
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  #24  
Old 12-07-2018, 08:38 PM
alval (Alan)
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Side view
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  #25  
Old 12-07-2018, 09:30 PM
AndrewJ
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Gday Alan
Gotta say it looks a lot more solid than i was expecting :-)
Quite a "disassy" exercise you have gone through



Andrew
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  #26  
Old 13-07-2018, 09:05 AM
alval (Alan)
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Hi Andrew

Must say sorry to Chris first for hijacking the thread.
Yes well it was interesting exercise but was actually quite easy nothing too hard. It is well designed and with well made castings and parts, the only thing that let it down were the assemblers and quality control. I searched for these sort of pictures before I bought it but couldnt find any, lots on the earlier ones. I think Iíll get organised and start a new thread with all the pics so it will come up easier if anyone else is interested pointing out differences and issues. Overall now its sweet finds and tracks objects well once set up correctly. Centred mars in alt/az as it was rising over my shed, went in for tea, watched tv for bit went out over an hour and half later and it was still well in field of view of 20mm eyepice. Iím happy with that.

Cheers Alan
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  #27  
Old 13-07-2018, 10:14 AM
AndrewJ
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Gday Alan
Quote:
Must say sorry to Chris first for hijacking the thread.
Yes and no. Lots of people have reported tracking/goto problems with the new ETX90 and A4S1 firmware, so a general thread on it that includes the new 125s as well may prove useful to others in the future.


Quote:
Yes well it was interesting exercise but was actually quite easy nothing too hard.
Thats a BIG change compared to the ETX125PE which is a mongrel to work with. Even to fix the power panel requires a complete base disassy.


It also "looks" more robust than the older ones, and i must admit i was expecting something much flimsier.
I must say i was also expecting it to have different ratios as well, but in your case it would appear the new gearbox takes into account the changed wormwheel.
All good.


Andrew
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