Hi Steve
you can do the high torque motors and RA Extension yourself
the spring-loaded worm is factory-installed only
Brian
I have a twenty year old G-11 which I upgraded to a Gemini-2 a few years ago.? Now I am interested in upgrading to the spring loaded worms.? After reviewing the information on the Losmandy website, I am interested in the following components:
- Spring loaded worm blocks + worms
- High Torque motors (might need to gear/motor housing)?
- RAEXK (my motors will NOT be tucked)
Does this make sense or do I need to ship my mount to Losmandy to add these components?? If it does make sense to order these components and install myself, what is the best way to order?
Thanks
Steve
-- Brian?
Brian Valente portfolio
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I have a twenty year old G-11 which I upgraded to a Gemini-2 a few years ago.? Now I am interested in upgrading to the spring loaded worms.? After reviewing the information on the Losmandy website, I am interested in the following components:
- Spring loaded worm blocks + worms
- High Torque motors (might need to gear/motor housing)?
- RAEXK (my motors will NOT be tucked)
Does this make sense or do I need to ship my mount to Losmandy to add these components?? If it does make sense to order these components and install myself, what is the best way to order? Thanks Steve
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Re: Needle bearings and axial play, is this a significant performance problem and how difficult is it to fix?
I thought the slew rate was limited by how fast the controller can count pulses?
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Re: Meridian Flips and NINA
Peter please see comments re: support ticket
I've tried both sides.
can we use the ticket to get this sorted, thanks. Easier to respond in one place
On Thu, Jul 22, 2021 at 12:34 PM pcboreland via <pcboreland= [email protected]> wrote: On Thu, Jul 22, 2021 at 11:59 AM, Brian Valente wrote:
Peter can you please email me, i must \not have your correct email address i'm at brian at losmandy dot com
?
Brian,
I think you must have it now as I just got an email. The test you did does not match mine. You need to slew on the other side of the meridian. Look at the coordinates in my video and you will see what I mean. I have the coordinates. mirrored horizontal. (Chart/transformation/mirror horizontally) in my setup.
Peter
-- Brian?
Brian Valente portfolio
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Re: Meridian Flips and NINA
On Thu, Jul 22, 2021 at 11:59 AM, Brian Valente wrote:
Peter can you please email me, i must \not have your correct email address i'm at brian at losmandy dot com
?
Brian, I think you must have it now as I just got an email. The test you did does not match mine. You need to slew on the other side of the meridian. Look at the coordinates in my video and you will see what I mean. I have the coordinates. mirrored horizontal. (Chart/transformation/mirror horizontally) in my setup. Peter
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Re: Meridian Flips and NINA
Peter can you please email me, i must \not have your correct email address i'm at brian at losmandy dot com
thx
On Thu, Jul 22, 2021 at 09:14 AM, Brian Valente wrote:
i was hoping to see this demonstration on the hand controller - I'm still not clear if you see this on the gemini by itself? without hooking up an external application.
?
?
Brian,
As I said this same thing happens using the hand controller. The scope is is this position per the image for this area of the sky in the video. It's not easy to make a video out in a field, in the sun looking at green digits that appear already in the panel to the right of the video, and therefore some what pointless.??
-- Brian?
Brian Valente portfolio
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Re: Needle bearings and axial play, is this a significant performance problem and how difficult is it to fix?
Here is may latest frequency plot from last night.? 125:1 gearbox. No PEC. Old thrust bearings.
In the first attached image we see the movement of the worm over almost 4 hrs.?
In the second image we see the raw frequency response. The p-p of the 80s bearing error is down massively to 1.2 arc-sec, from an earlier posting. I changed over to using a single pressure washer that compresses the ball bearings. The 240s error p-p is 2.6 arc-sec, and the 2600s error is a massive 5.8 arc-sec. I've not see this error so well defined before on shorter guiding runs. I believe this error is due to the roller bearings (either thrust or the needle bearings). I still have my original Losmandy thrust bearings in place, but will be changing over to the McMaster-Carr one this weekend.
The third? image shows the impact of guiding. The 2600s error is gone. The 80s error is now p-p 0.4 arc-sec, and the 240s error is arc-sec 0.3 arc-sec.?
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Re: Needle bearings and axial play, is this a significant performance problem and how difficult is it to fix?
On Tue, Jul 20, 2021 at 10:26 PM, alan137 wrote:
How does one get to the thrust bearings?
What's the source and part number for the encoders?
What's the maximum slew rate with the 1024 encoders?
Thrust Bearings:? McMaster-Car? Needle Roller Trust Bearing for 1-1/4" shaft, 1 -15/16" OD part number 5909K38 McMaster-Car? Needle Roller Trust Bearing for 3" shaft, 3 3/4"" OD part number 5909K28 Optical Encoders: US Digital,? call sales department to order, Part number E2-1024-125-NE-D-D-B Since the gear boxes remain at 25:1 the slew rate ought to be the same. US same values.? Peter
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Re: Meridian Flips and NINA
Peter i'm going to open a ticket with your email address
We need more specifics here, i'm unable to reproduce based on what you sent
look for direct email
Brian
On Thu, Jul 22, 2021 at 09:14 AM, Brian Valente wrote:
i was hoping to see this demonstration on the hand controller - I'm still not clear if you see this on the gemini by itself? without hooking up an external application.
?
?
Brian,
As I said this same thing happens using the hand controller. The scope is is this position per the image for this area of the sky in the video. It's not easy to make a video out in a field, in the sun looking at green digits that appear already in the panel to the right of the video, and therefore some what pointless.??
-- Brian?
Brian Valente portfolio
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Re: Meridian Flips and NINA
On Thu, Jul 22, 2021 at 09:14 AM, Brian Valente wrote:
i was hoping to see this demonstration on the hand controller - I'm still not clear if you see this on the gemini by itself? without hooking up an external application.
?
?
Brian, As I said this same thing happens using the hand controller. The scope is is this position per the image for this area of the sky in the video. It's not easy to make a video out in a field, in the sun looking at green digits that appear already in the panel to the right of the video, and therefore some what pointless.??
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Re: Meridian Flips and NINA
Hi Peter
i was hoping to see this demonstration on the hand controller - I'm still not clear if you see this on the gemini by itself? without hooking up an external application.
On Thu, Jul 22, 2021 at 08:27 AM, Brian Valente wrote:
Peter most importantly is what steps can someone take to reproduce it
Brian,
I made this 3min video of the problem occurring. This was after doing a hand controller reset and entering all my data anew. As you will see, as the bulls eye moves from the CDW position and it gets close to the target it winks out a reappears in the lower left corner of the screen. I was able to move to bullseye "scope" to another target in this "dead zone", and then out of the dead zone where the bulls eye reappears.?
I think this makes the whole problem clear for folks here so that they can do their own tests. I first noticed this problem in January during galaxy season. This was before making any changes to gearboxes etc.
I will email this link to Rene, perhaps you too could contact him.?
Peter
-- Brian?
Brian Valente portfolio
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Re: Meridian Flips and NINA
On Thu, Jul 22, 2021 at 08:27 AM, Brian Valente wrote:
Peter most importantly is what steps can someone take to reproduce it
Brian, I made this 3min video of the problem occurring. This was after doing a hand controller reset and entering all my data anew. As you will see, as the bulls eye moves from the CDW position and it gets close to the target it winks out a reappears in the lower left corner of the screen. I was able to move to bullseye "scope" to another target in this "dead zone", and then out of the dead zone where the bulls eye reappears.? I think this makes the whole problem clear for folks here so that they can do their own tests. I first noticed this problem in January during galaxy season. This was before making any changes to gearboxes etc. I will email this link to Rene, perhaps you too could contact him.? Peter
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Re: Meridian Flips and NINA
Peter most importantly is what steps can someone take to reproduce it
I reset Gemini and reloaded everything. Slewed to that area of the sky and same problem, This? nothing to do with flips or NINA, but clearly there is a serious bug with the Gemini II software itself.?
All the recent tests were done strictly with the hand controller. I simply can not believe I'm the only one with the issue.? Perhaps it's because I'm going to an area of the sky others do not, or like me experienced the problem and thought is was a one off and a flip problem.
I would encourage folks to do their own tests. I can video the problem if that would help.
Peter
-- Brian?
Brian Valente portfolio
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Re: Meridian Flips and NINA
>>>
I would encourage folks to do their own tests. I can video the problem if that would help.
yes please
I reset Gemini and reloaded everything. Slewed to that area of the sky and same problem, This? nothing to do with flips or NINA, but clearly there is a serious bug with the Gemini II software itself.?
All the recent tests were done strictly with the hand controller. I simply can not believe I'm the only one with the issue.? Perhaps it's because I'm going to an area of the sky others do not, or like me experienced the problem and thought is was a one off and a flip problem.
I would encourage folks to do their own tests. I can video the problem if that would help.
Peter
-- Brian?
Brian Valente portfolio
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Re: Meridian Flips and NINA
I reset Gemini and reloaded everything. Slewed to that area of the sky and same problem, This? nothing to do with flips or NINA, but clearly there is a serious bug with the Gemini II software itself.?
All the recent tests were done strictly with the hand controller. I simply can not believe I'm the only one with the issue.? Perhaps it's because I'm going to an area of the sky others do not, or like me experienced the problem and thought is was a one off and a flip problem.
I would encourage folks to do their own tests. I can video the problem if that would help.
Peter
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Re: Meridian Flips and NINA
On Thu, Jul 22, 2021 at 10:34 AM, <pcboreland@...> wrote:
Is it possible to reset Gemini II to its factory defaults?
From Gemini HC, press "Reset HGM Defaults": From Gemini web pages, press "RESET SRAM":
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Re: Meridian Flips and NINA
On Thu, Jul 22, 2021 at 10:34 AM, <pcboreland@...> wrote:
So it seems the problem is with the Gemini II controller and not the driver?
You said the RA coordinate jumps on the Gemini physical hand controller, so no, this has nothing to do with the driver. Again, I don't know anything about NINA meridian flips, and can't help you there. All I'm talking about is the coordinate jumping when nearing the AZ 360 degree limit.
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Re: Meridian Flips and NINA
So the problem existed well before messing with gearboxes or encoders. Is it possible to reset Gemini II to its factory defaults? I hate to do this because I'll have to reprogram everything.??
There is definitely an abrupt transition point where both the AZ and Alt axis coordinates jump. The Alt value goes from +80s to a negative value. However, in this dead zone you can still navigate to stars correctly even though the coordinates being shown are wrong.? Hence, to can navigate to a point just outside the dead zone on the target reappears on the chart. The problem with the flip if you are in this deadzone, is NINA grabs these messed up coordinate and slews to them.
So it seems the problem is with the Gemini II controller and not the driver?
Peter
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Re: Meridian Flips and NINA
On Thu, Jul 22, 2021 at 09:42 AM, <pcboreland@...> wrote:
The scope thinks it's the southern hemisphere as shown in this pic, where it? should be sayings it's in the blue zone. By rotating the Dec access pointing to the north it will again show its correct location. With Dec in this location it suddenly? decided oh I'm am in the northern hemisphere at 353 degrees Az and the target jumps to the correct location. Is this a problem with me, you or Rene?
Let me ask you, is this with your higher resolution encoders / smaller step size? That could be a problem for some internal Gemini computation. In all my years using Gemini, I've not seen the problem you're reporting.
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Re: Meridian Flips and NINA
Can't imagine how the driver can do this, especially since the Gemini HC is also showing the same coordinates. The driver displays what Gemini reports.
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On Thu, Jul 22, 2021 at 09:42 AM, <pcboreland@...> wrote:
The scope thinks it's the southern hemisphere as shown in this pic, where it? should be sayings it's in the blue zone. By rotating the Dec access pointing to the north it will again show its correct location. With Dec in this location it suddenly? decided oh I'm am in the northern hemisphere at 353 degrees Az and the target jumps to the correct location. Is this a problem with me, you or Rene?
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Paul Kanevsky