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Old 02-08-2020, 10:32 AM
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Cosmic (Daniel)
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NEQ6 rebuild/belt modded

Morning team,

Hope we are all travelling well in these uncertain times. I decided to rip down the NEQ6 Pro and just regrease everything because as much as I love Easter, I hate seeing eggs in the sky. The errors in the gears were just to hard to fix, so I stripped it down, regreased and belt mod it. I was always chasing numbers on PHD 2 and with hours and hours I never really got better than 1" rms. After the complete rebuild I managed to get a rough 0.7" rms total, so things have improved quite dramatically even with a very rough PA for now. The graph looks spikey so there may even be more room for improvement as well with the meshing of the worm gear.

Question:
There is one strange thing happening from time to time, the tracking stops in RA and the star drifts away out of range quite fast as well. Maybe the belt is to tight, not sure but if anyone has an idea I'd love to hear it. All the bearings rolled very nicely and there should be no need to think they are jamming...but know knows at this stage?

Thanks for looking

https://s6.gifyu.com/images/guilding-PHD.md.jpg

https://s6.gifyu.com/images/strip-down.md.jpg
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Old 02-08-2020, 10:54 AM
sunslayr (David)
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What's the slewing like in ra? If it's smooth at max speed without skipping try putting a little pressure against it. If that's all good then it's probably not to tight. The only other thing I can think of is maybe the power supply doesn't quite cut it.
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Old 02-08-2020, 11:52 AM
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Cosmic (Daniel)
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Quote:
Originally Posted by sunslayr View Post
What's the slewing like in ra? If it's smooth at max speed without skipping try putting a little pressure against it. If that's all good then it's probably not to tight. The only other thing I can think of is maybe the power supply doesn't quite cut it.
Hi David, you maybe right in the power department. I do remember the red power LED flickering when slewing once or twice, so that could be connected possibly. I use the 240v 5A power supply they usually run with, I will swap it with another one I have.

With the RA tracking I did place my hand on the counter weight bar when tuning it. Seemed to be ok in both east and west with a small load. I'm just really shy to touch the meshing screws again but I may have to worst case. It just takes so much time to get right and it's a shame you cant see the gears engaging in this process. Cheers for the reply.
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Old 02-08-2020, 01:16 PM
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Sunfish (Ray)
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If the red lights flashes constantly then the power is dropping. If you have 5a supply it is more likely the plug or the adapter causing a flicker. My plug is sensitive to how far in it is pushed , Chinese plugs tolerances are not so good, and several adapter wires have failed from overuse.

The rowan belt should not be so tight it does not have 2mm at least movement in and out and a full 360 degree test should not bind or be noisy at any point. You should just be able to turn the worm by hand with the belt on.

Quote:
Originally Posted by Cosmic View Post
Morning team,

Hope we are all travelling well in these uncertain times. I decided to rip down the NEQ6 Pro and just regrease everything because as much as I love Easter, I hate seeing eggs in the sky. The errors in the gears were just to hard to fix, so I stripped it down, regreased and belt mod it. I was always chasing numbers on PHD 2 and with hours and hours I never really got better than 1" rms. After the complete rebuild I managed to get a rough 0.7" rms total, so things have improved quite dramatically even with a very rough PA for now. The graph looks spikey so there may even be more room for improvement as well with the meshing of the worm gear.

Question:
There is one strange thing happening from time to time, the tracking stops in RA and the star drifts away out of range quite fast as well. Maybe the belt is to tight, not sure but if anyone has an idea I'd love to hear it. All the bearings rolled very nicely and there should be no need to think they are jamming...but know knows at this stage?

Thanks for looking

https://s6.gifyu.com/images/guilding-PHD.md.jpg

https://s6.gifyu.com/images/strip-down.md.jpg
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Old 02-08-2020, 01:46 PM
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ChrisV (Chris)
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Maybe wait till you get the PA sorted? Looks like it's really struggling with that
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Old 02-08-2020, 02:40 PM
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Cosmic (Daniel)
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Quote:
Originally Posted by Sunfish View Post
If the red lights flashes constantly then the power is dropping. If you have 5a supply it is more likely the plug or the adapter causing a flicker. My plug is sensitive to how far in it is pushed , Chinese plugs tolerances are not so good, and several adapter wires have failed from overuse.

The rowan belt should not be so tight it does not have 2mm at least movement in and out and a full 360 degree test should not bind or be noisy at any point. You should just be able to turn the worm by hand with the belt on.
Hi Ray,

Thank you for your input.

I will check the connection to the eq6, plus I will make a loop onto itself so there is no movement when slewing/tracking ect. I remember seeing someone use a built in ammeter to check drops and the draw when tuning the worm.....this bit of kit is something I may look into as well, might be handy in sorting out power issues.


Currently at work but I do remember turning the RA with pliers and the DEC by hand may explain what could also be happening here. I think we are getting close to resolving this issue. I preloaded the belt with my finger mildly applying pressure down the side of the motors just to be sure, but it sounds like there might be too much force on the belts. I will report back once I have tried those two things.

Last edited by Cosmic; 02-08-2020 at 02:57 PM.
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Old 02-08-2020, 02:49 PM
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Cosmic (Daniel)
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Quote:
Originally Posted by ChrisV View Post
Maybe wait till you get the PA sorted? Looks like it's really struggling with that
Its a good point as well Chris, its fighting hard by the looks hey. I'm excited to some point because once these little things are fixed it will be even better. For my image scale, I need it "around" .6-.7 rms to have perfect stars

My orthogonality error was 11.3, so lots of room for improvement. I better get drifting
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Old 02-08-2020, 06:42 PM
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Well if you only tightened the belt by pushing with your finger that would not be too tight. I think I used a small screwdriver to get 2mm of movement. Odd however that you would need pliers to turn the worm. Is that both axes. ? I am more familiar with a Heq5 so perhaps others could say if this is usual.
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Old 02-08-2020, 09:15 PM
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Nikolas (Nik)
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I had that issue as well, turned out it was a loose grub screw. On the RA motor when I changed to the new belt gear.
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