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Re: Jupiter - 10-05-22
¿ªÔÆÌåÓýMany thanks Andrew! ? From: [email protected] <[email protected]> On Behalf Of Andrew Arai
Sent: Thursday, October 6, 2022 10:34 AM To: [email protected] Subject: Re: [C14EdgeHD] Jupiter - 10-05-22 ? On Wed, Oct 5, 2022 at 01:49 PM, bgcombs44 wrote: You really have your scope finely tuned. The Mars image and the Jupiter image that you posted are really impressive. I visited your website and it seems you also do impressive deep sky work. Thanks for sharing. |
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Re: Jupiter - 10-05-22
On Wed, Oct 5, 2022 at 01:49 PM, bgcombs44 wrote:
http://www.bcastropics.com/images/view/810You really have your scope finely tuned. The Mars image and the Jupiter image that you posted are really impressive. I visited your website and it seems you also do impressive deep sky work. Thanks for sharing. Andrew |
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Re: Celestron SCT Teardown Video
thanks Curtis. I guess it would be great if it worked out of the box rather than have the additional cost and hassle of trying to repair something which shouldn't need repairing. :) :) :) Celestron should take note? - we pay good money for this stuff ....
all the best, Paul |
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Re: Celestron SCT Teardown Video
Paul
Thank you. The Celestron motorized focuser works quite well once one fixes the problem inherent in the adapter plate that Celestron supplies.? And the fix is rather simple as shown in the video.? So, while the Feathertouch may be an excellent choice I have no problem recommending the Celestron focuser. Yes, if the contribution to mirror flop from the focuser is eliminated then what remains is inherent to the fact that the mirror is not locked down in the Celestron SCT design.? ?Even the "locking knobs" on the Edge versions merely put a little pressure on the back side of the mirror mounting plate and do not actually lock down the mirror.? The obvious source of this is the play that is required in the baffle tube arrangement so that the mirror can slide forward and backwards during focusing.? You will see this and Dave's fix in the 3rd video which I still have to edit and upload. Regards, Curtis |
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Re: Celestron SCT Teardown Video
Very interesting and informative videos, thanks again for sharing them. Just to note that if you use Starizona's microtouch in conjunction with a Feathertouch focuser, the problems of poorly fitting retaining rings do not exist. The engineering quality of the Feathertouch and Microtouch is first class imo. As previously mentioned I have used these on C11 and C14 instruments for 10 years or so.
So the fact that my focusers do not have the problems described in the video, i.e. side to side movement of the mechanism, but that I do still have mirror flop, probably indicates (at least in my C11 case) that mirror flop has other causes. I'm about to watch the tear down video now, so perhaps I'll get some more clues about flop. Thanks again, Paul |
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Celestron SCT Teardown Video
A few years back I over tightened my hyperstar on my C14 and had to remove the corrector plate to get it off.? But, I never personally completely disassembled an SCT.??Last Christmas I helped my friend Dave tear down his Celestron C11 when he decided to make some modifications to his scope.? He was mainly interested in reducing mirror flop and had read about a procedure to add some nylon screws to the outer baffle to take up some of the play between the outer and inner baffle tubes.? He also took the opportunity to add a BT weather station inside, some fans to direct air flow across the primary mirror, regrease the baffle tubes and flock the inside of the Al tube.? In the process Dave found a problem with the Celestron motorized focuser which likely leads to additional mirror flop, not shift, and fixed that.? I checked my C11 (did not need to tear down the scope to do this) and found the same flaw which I also fixed in a different way from Dave.? Others have reported this same flaw in the Celestron focuser hardware, but I have not seen anyone ascribing mirror flop to the problem before this.? Regardless, the fix seems to have helped reduce image drift substantially in Dave's scope.?
While helping him I videoed the entire process and have created the first of three videos that I thought I would share.? I broke this down into 3 videos because it would be too long as one big video and, there really are 3 different things going on here.? The first video shows the process in detail for completely disassembling the SCT and also how to put it back together after.? That one is already posted and you can find it here??? ?
Hopefully this will help anyone who needs to take their SCT apart, even if only to remove the corrector plate and not do a full disassembly.? As soon as I get time, I will edit and post the video showing the problem we discovered with the Celestron focuser and the fixes we both used.? And later, I can put together and post the final video which shows the main reason for opening up the SCT.? I think you will find some of Dave's upgrades interesting.
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Best Regards,
Curtis? |
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Re: Help with pittman motor FIXED
Careful disassembly of the motor revealed that one of the brushes was somehow skewed in it's slot and was crossconnecting the commutator slots. How this happened is beyond me, as I have taken many of these motors apart and not seen this before. Be aware that disassembly is NOT for the faint of heart as getting the springs and the brushes is tricky, but using sewing needles to hold the springs back while reassembly is a neat trick. Pulling the needles out after the brushes and holders are back into position is the secret for me. A LOT of the pieces of these slightly different models of the motors are interchangeable, but not all. Many of the gearboxes use the same frames with only slight changes in gears, so changing the ratios is often possible if you have a selection of them. They often come on sale on the auction site in batches so for hobbyists, picking up a few occasionally is a good idea.
Mike VE3EQP .....> |
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