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  #81  
Old 07-11-2013, 10:14 PM
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coldknights (Cathy)
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The mount is over 2 yrs old we have only had it about 2 or 3 weeks we bought it to test our 4way Bluetooth modules out on and did not like the Grrrrr sound of the Gears so we did the belt mod kit as we have a video to do on the 4 Way Bluetooth to upload to YouTube just waiting on the Boxes to come back from the manufacturer .
Once the video is done this mount (mount only ) is for sale so then it is off to buy a EQ8 so we can test the 4 Way Bluetooth module on that then we will be selling them.
We have tested the 4 Way Bluetooth on the NEQ6 with EQmod ,Stellarium scope and Stellarium ,the sky version 5 and the sky x which all worked well.
We have tested the new belt kit inside at the moment as we only finished it off today but mounted the 10" Newtonian and slewed around with 10kg of counter weight on it with the extra length of counter weight shaft as well.
We had no problem with slewing all different angles we gave it a good test .
Now the rain will be with us the next few days Murphy's law can't wait to take it outside for a night and try it.

Last edited by coldknights; 08-11-2013 at 07:31 AM. Reason: Correction
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  #82  
Old 08-11-2013, 08:32 AM
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Loupy31 (Peter)
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Hi Cathy, do you have more pics on the install of the belt kit?

Also do you have a before and after Pec reading?
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  #83  
Old 08-11-2013, 08:53 AM
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did you need to replace any bearings? while you had the mount in bits
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  #84  
Old 08-11-2013, 09:03 AM
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Hi we have a few more pics on the install but not much of importance just a few pics of the table and tools I will go through the pictures later today all so no pec data was collected our only interest was to have a quiet mount to do the video with so whoever buys this mount can do it it would good I think from visual inspection of the internals of the mount everything looked new even the shims compared to some of the pictures on the net and the YouTube video's we have seen this mount is in better condition then all of them I would class this mount as a Sunday mount only taken out and used on 1 Sunday every 3 months or so .
Is a shame that skywatcher did not make this mount with the belts but they did do it with the AZ-EQ6 and also the EQ8.
When doing the mod stick to the instructions carefully and also go to Astrobaby website on the rebuild it gives you the important part settings the worm drive setting instructions .
And the bearing were in top condition as well they to like new packed them a little with lithium grease as well not overboard like I have seen done bearing need Grease but not a bucket like I have seen on the net and YouTube .
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Last edited by coldknights; 08-11-2013 at 09:29 AM.
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  #85  
Old 08-11-2013, 09:21 AM
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Ok, sounds good, although PEC data would have been good if only to see how accurate the belt system is.....
Just a quick off topic question, why did you go for batteries in your blue tooth adapters.?
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  #86  
Old 08-11-2013, 09:52 AM
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Ok, So let me get this right, there is a box (with batteries) plugged into the hand controller rs232 port and a cable going from the HC to the mount, so why do you need to blue tooth the HC.? wouldn't it have been more efficient to just blue tooth the mount and by pass the HC,(which doesn't get used in that setup)
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  #87  
Old 08-11-2013, 09:54 AM
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hi,

I'm very interested in this.
just to clarify, does the mod change the gear ratio at all? do we have to change the tracking rate in eqmod or is the gear ratio precisely the same as the original?

Cheers
Alistair
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  #88  
Old 08-11-2013, 10:07 AM
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Its same as the original
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  #89  
Old 08-11-2013, 10:24 AM
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Ok, I understand that, but still cant understand why you need to plug into the HC, if your going to use astro programs, why not just go direct to the mount?
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  #90  
Old 08-11-2013, 10:52 AM
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Quote:
Originally Posted by alistairsam View Post
hi,

I'm very interested in this.
just to clarify, does the mod change the gear ratio at all? do we have to change the tracking rate in eqmod or is the gear ratio precisely the same as the original?

Cheers
Alistair
With this mod you can still use your Synscan hand controller as well as EQmod .
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  #91  
Old 08-11-2013, 11:17 AM
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Thanks Cathy.
What is the expectation of how low the backlash would be?
My main issues are with goto's not being precise when you re-slew to the same target even if on the same side of the pier and of course the periodic error.

with the belts, I imagine the backlash would be very low so apart from removing PE, would one expect to see an improvement in goto's as well?
anyone tested this?

Cheers
Alistair
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  #92  
Old 08-11-2013, 11:23 AM
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Send Dave a pm and he should be able to answer your questions.
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  #93  
Old 08-11-2013, 12:51 PM
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Also take into concideration that each mount has its own variance in tolerance , regardless how well the timing pulleys are made
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  #94  
Old 08-11-2013, 12:55 PM
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The only backlash, if any, will be in how well the worm shaft mates to the worm gear, all other backlash should be eliminated, But then again I am no expert.

Quote:
Originally Posted by alistairsam View Post
Thanks Cathy.
What is the expectation of how low the backlash would be?
My main issues are with goto's not being precise when you re-slew to the same target even if on the same side of the pier and of course the periodic error.

with the belts, I imagine the backlash would be very low so apart from removing PE, would one expect to see an improvement in goto's as well?
anyone tested this?

Cheers
Alistair
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  #95  
Old 09-11-2013, 03:27 AM
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Quote:
Originally Posted by alistairsam View Post
Thanks Cathy.
What is the expectation of how low the backlash would be?
My main issues are with goto's not being precise when you re-slew to the same target even if on the same side of the pier and of course the periodic error.
With the belts, I imagine the backlash would be very low so apart from removing PE, would one expect to see an improvement in goto's as well?
anyone tested this?
Cheers
Alistair
Hi Alistair,
What pointing error are you getting with your gotos when slewing back to the same target?

The main source of backlash which will give you gross pointing errors is from the worm-wheel mesh.

The secondary source of backlash is from the clearance between the motor gear teeth to the transfer gear and then on to the worm drive gear.
Gear clearances may amount to 10 to 20 arc sec of backlash which cause a lot of grief when guiding.

And third, the worm wheel PE and combined eccentricities in the drive gearing.

The gear clearance is eliminated with a belt mod and as such the mount response to guide corrections is much improved.

Next time I'm set up testing I'll do a backlash test on my NEQ6.
Thanks,
Dave.

ps Purposely setting a slight imbalance in RA and dec causes the worm wheel contact to be on one side and can help a lot with that backlash problem.
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  #96  
Old 09-11-2013, 06:55 AM
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That is basically what I said,
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  #97  
Old 09-11-2013, 10:13 AM
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Quote:
Originally Posted by Loupy31 View Post
That is basically what I said,
Yes, I'd agree with that.
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  #98  
Old 09-11-2013, 10:35 AM
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Thanks Dave

if I center and sync a star in the east, then slew to the north and slew back to the star, its always at the edge of the field. is this normal for the neq6?
would be good if you csn test this with the belt mod.

I will get this kit and use the oppotunity to adjust the worm mesh.

is a gear puller required for the gear on the motor?

cheers
Alistair
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  #99  
Old 09-11-2013, 10:41 AM
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Hi Alistair we did not need the Gear Puller tool for the removal of the gear just undo the 2 Grub screws and it comes straight off just remember to Debur the motor shaft with a small file so the new Gear can go on and follow the instructions and set it at 3.5mm download the PDF from Dave's web page and read it ,it helps a lot.
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  #100  
Old 09-11-2013, 10:52 AM
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I've ordered an NEQ6 kit off Dave and was pleasantly surprised to find the prices for residents outside the UK are 20% off website quoted (no VAT) - about $211 AUD delivered.

(I was beginning to think Dave might just like Aussies )
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