Did you see this?
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Joseph Rome
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Laurie Allai
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Joseph Rome
Not really, but this mount is a lot better than the CGX-L. Has no PE to correct, will run the EDGE-11 without counterweights, very easy to polar align (laser)., carbon fiber tripod (light), runs through ASCOM as a Mead mount. I would run the counterweight. Very interesting mount. I guess next we will see ASIZWO telescopes. Joe Sure did. Why? Do you want one? |
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John A. Sillasen
Joseph if you get one of these AZIZWO mounts, it would be super interesting to somehow compare it as 1st generation to the seasoned Rainbow Astro RST-135E (the one with the Reninshaw Encoders on the RA axis. If course the price difference is more like ZWO vs. Fingerlakes FLI but still, quite curious as to how it behaves. John A. Sillasen -------- Original message -------- From: Joseph Rome <romejoseph9@...> Date: 12/28/21 4:56 PM (GMT-05:00) To: ImagesPlus@groups.io Subject: Re: [ImagesPlus] Did you see this? Not really, but this mount is a lot better than the CGX-L. Has no PE to correct, will run the EDGE-11 without counterweights, very easy to polar align (laser)., carbon fiber tripod (light), runs through ASCOM as a Mead mount. I would run the counterweight. Very interesting mount. I guess next we will see ASIZWO telescopes. Joe Sure did. Why? Do you want one? |
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I ordered the ZWO mount. I will compare it to my RST-135E and Mach1. ZWO took my money immediately. Shipping promised in April. There is a new ZWO-astro group on groups.io. On Tue, Dec 28, 2021, 2:17 PM John A. Sillasen <jasillasen@...> wrote:
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Using the Meade protocol is a double-edged sword. The classic Meade command set is rather primitive and doesn't address GEM mount nuances, like meridian flip. On Tue, Dec 28, 2021, 2:48 PM Christopher Erickson via groups.io <christopher.k.erickson=gmail.com@groups.io> wrote:
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John A. Sillasen
That's dedication to product testing,.Chris. I appreciate your tests and financial ability to do such product comparisons. John A. Sillasen -------- Original message -------- From: Christopher Erickson <christopher.k.erickson@...> Date: 12/28/21 5:51 PM (GMT-05:00) To: ImagesPlus@groups.io Subject: Re: [ImagesPlus] Did you see this? I ordered the ZWO mount. I will compare it to my RST-135E and Mach1. ZWO took my money immediately. Shipping promised in April. There is a new ZWO-astro group on groups.io. On Tue, Dec 28, 2021, 2:17 PM John A. Sillasen <jasillasen@...> wrote:
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John Schnupp
ZWO and Pegasus are simply the latest, the first one I saw was Rainbow Astro RST-135, HOYBM is another, there are probably others that I am not aware of. All of these mounts are based on strain wave gear (aka harmonic drive). Here are two videos showing the operation and theory of strain wave/harmonic drive. This is not a new technology. I have been working in semiconductor manufacturing as an equipment engineer for nearly 35 years. Almost all of our equipment is driven with harmonic drives and can accurately and repeatedly position equipment with sub-micron/nanometer precision. Harmonic drive have large gear reduction ratios and can develop lots of torque and can handle large load imbalances. There is also zero backlash. All great, I've often wondered why they were not use in astro gear. One of the biggest detractors for use in amateur astronomy gear is the price. Harmonic drives are more expensive than standard worm drives. Harmonic drives tend to creep if the load is unbalanced and the power is turned off, this requires brake hardware so that the mount does not lose position when turned off. Finally, the elephant in the room is periodic error. Harmonic drive have multiple rotating parts, and due to the high gear ratios the same areas gears do not repeatedly engage. Harmonic drive mount will most certainly need to be guided for best results. Here is a link to ZWO showing two PE graphs, the full graph is based on the output making one revolution and the single graph is based on the input making a single revolution. At nearly 20arc-sec error it is not that great, but as the single graph shows, it is relatively slow changing and should be able to be guided out. It seems counter-intuitive but best guiding come from using very short, <1sec, exposures. High sensitivity, low noise sensors in guide cams are part of the success of these drives. John Schnupp, N3CNL
2007 R1200RT 67,550 (hibernation)
1995 XLH 1200 106,495 (retired)
Georgia, VT44.7675°N, 73.1592°
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John,
Thanks for the write up and the 2 YT links. I didn't know anything about strain wave/harmonic gears before your post, but can know see how they could be a good, backlash free solution for telescope mounts. It's also interesting to note that they will require
guiding, as the type of mechanical errors experienced are not easily corrected by PEC.
It will be interesting to see how the market for these develops.
Cheers,
Geof From: ImagesPlus@groups.io <ImagesPlus@groups.io> on behalf of John Schnupp via groups.io <johnschnupp@...>
Sent: 29 December 2021 19:39 To: ImagesPlus@groups.io <ImagesPlus@groups.io> Subject: Re: [ImagesPlus] Did you see this? ZWO and Pegasus are simply the latest, the first one I saw was Rainbow Astro RST-135, HOYBM is another, there are probably others that I am not aware of. All of these mounts are based on strain wave gear (aka harmonic drive). Here are two videos showing
the operation and theory of strain wave/harmonic drive. This is not a new technology. I have been working in semiconductor manufacturing as an equipment engineer for nearly 35 years. Almost all of our equipment is driven with harmonic drives and can accurately and repeatedly position equipment with sub-micron/nanometer precision. Harmonic drive have large gear reduction ratios and can develop lots of torque and can handle large load imbalances. There is also zero backlash. All great, I've often wondered why they were not use in astro gear. One of the biggest detractors for use in amateur astronomy gear is the price. Harmonic drives are more expensive than standard worm drives. Harmonic drives tend to creep if the load is unbalanced and the power is turned off, this requires brake hardware
so that the mount does not lose position when turned off. Finally, the elephant in the room is periodic error. Harmonic drive have multiple rotating parts, and due to the high gear ratios the same areas gears do not repeatedly engage. Harmonic drive mount
will most certainly need to be guided for best results. Here is a link to ZWO showing two PE graphs, the full graph is based on the output making one revolution and the single graph is based on the input making a single revolution. At nearly 20arc-sec error
it is not that great, but as the single graph shows, it is relatively slow changing and should be able to be guided out. It seems counter-intuitive but best guiding come from using very short, <1sec, exposures. High sensitivity, low noise sensors in guide
cams are part of the success of these drives. John Schnupp, N3CNL
2007 R1200RT 67,550 (hibernation)
1995 XLH 1200 106,495 (retired)
Georgia, VT44.7675°N, 73.1592°
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John Schnupp
Geof,
ZWO has come a long way in the 10 years or so that they have been making astro imaging cameras. They really elevated the CMOS sensor cameras. Their ASIAir was also a game changer (although I don't have one). Hopefully they will be able to do the same for there harmonic drive mounts. I can see these mounts being a game changer for portable use. John Schnupp, N3CNL
2007 R1200RT 67,550 (hibernation)
1995 XLH 1200 106,495 (retired)
Georgia, VT44.7675°N, 73.1592° |
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Thanks John,
I’ve got a couple of excellent ASI cameras that I use for planetary, lunar and solar imaging. I’ve read good things about the ASIAir, but also that it only works with ASI cameras, so that kills it as a solution for me. I also wasn’t impressed that they effectively
stole a lot of the open source PHD2 product, made a few modifications then badged it as their own, without even changing the PHD2 heading on a lot of the output. I keep seeing the PHD2 developers quite rightly batting away requests for diagnostic help on the
Open PHD2 forum, from ASIAir users, who are using the ZWO cloned version of PHD2.
Cheers,
Geof
From: ImagesPlus@groups.io <ImagesPlus@groups.io> on behalf of John Schnupp via groups.io <johnschnupp@...>
Sent: Friday, December 31, 2021 10:48:22 AM To: ImagesPlus@groups.io <ImagesPlus@groups.io> Subject: Re: [ImagesPlus] Did you see this? Geof,
ZWO has come a long way in the 10 years or so that they have been making astro imaging cameras. They really elevated the CMOS sensor cameras. Their ASIAir was also a game changer (although I don't have one). Hopefully they will be able to do the same for there harmonic drive mounts. I can see these mounts being a game changer for portable use.
John Schnupp, N3CNL
2007 R1200RT 67,550 (hibernation)
1995 XLH 1200 106,495 (retired)
Georgia, VT44.7675°N, 73.1592° |
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Ernest Adams
Hi Joe, I'm trying to change my subscription but I don't seem to be a member. Altho, I seem to get all messages.. Any thoughts? Ernest On Tue, Dec 28, 2021 at 9:58 AM Joseph Rome <romejoseph9@...> wrote: |
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Hi Earnest,
I got your message via email and checked the group web page and it’s posted there too, so I think you must be a member. Why do you think that you’re not a member, how are you trying to log in?
Regards, Geof
From: ImagesPlus@groups.io <ImagesPlus@groups.io> on behalf of Ernest Adams <edadams2@...>
Sent: Thursday, July 14, 2022 4:05:36 PM To: ImagesPlus@groups.io <ImagesPlus@groups.io> Subject: Re: [ImagesPlus] Did you see this? Hi Joe,
I'm trying to change my subscription but I don't seem to be a member. Altho, I seem to get all messages..
Any thoughts?
Ernest
On Tue, Dec 28, 2021 at 9:58 AM Joseph Rome <romejoseph9@...> wrote:
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Ernest Adams
I"m unable to jump to the group to accessfiles , photos, etc. imagesplus is not listed as one of my groups, and I don't seem to have a login. but I vaguely remember joining? Ernest On Thu, Jul 14, 2022 at 10:14 AM Geof Lewis <geoflewis@...> wrote:
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Hi Earnest,
So, it’s not a group.io access problem, just the ImagesPlus group? Have you tried emailing Mike Unsold to see if he can reset your group membership password? I don’t know if he’ll be able to do anything, or how quickly he’d respond, but it’s
worth a try.
Good luck,
Geof
From: ImagesPlus@groups.io <ImagesPlus@groups.io> on behalf of Ernest Adams <edadams2@...>
Sent: Saturday, July 16, 2022 6:48:49 PM To: ImagesPlus@groups.io <ImagesPlus@groups.io> Subject: Re: [ImagesPlus] Did you see this? I"m unable to jump to the group to accessfiles , photos, etc. imagesplus is not listed as one of my groups, and I don't seem to have a login. but I vaguely remember joining?
Ernest
On Thu, Jul 14, 2022 at 10:14 AM Geof Lewis <geoflewis@...> wrote:
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Ernest Adams
He doesn't respond to anyone for many years now. I'll try the group administrator. And perhaps Rick Burke. Thanks ! Ernest On Sat, Jul 16, 2022 at 1:21 PM Geof Lewis <geoflewis@...> wrote:
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