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Re: Changing the servo motor encoders from 256 to 512 or 1024. Any reason not to do this?
Peter, I had heard about the hanging weight many years ago but I avoided using that for silly cosmetic?reasons (my own vanity...thinking about the beauty of the mount and not on ultimate performance) ...and I never seemed to need it on my G11 systems.? I always got very good results using the Belleville R4 springs, McLennan gearbox, ABEC-7 bearings, etc.) and my old straight out drives worms are in light but full contact...lucky me.? Here are photos of the C14EdgeHD on the G11 (not G11T) mount.? Note the very long 33 inch long counterweight bar made for me by my nice neighbor.?? On my G11T, I heard from many Titan owners that the hanging cord was essential.? And it proved that it is essential any time your worm has a gap to the ring gear.? You must assure the worm and ring gear contact point remains consistent.? If the contact point flips over you'd get a big glitch (near CWD) from that and also you could get vibration (chatter) if the system has its upper weight to the West not East.?? That effect has to do with the attack angle the worm is making with the ring gear teeth.? If that contact is "dragging" like pulling a chalk across a chalkboard like this: _____ /____->? with the chalk moving to the right, you'd get a smooth rubbing with no chatter.? But if you'd push the chalk to the right like this:? _____\ ______->? then you'd get chatter.? Try it if you have some chalk and a chalkboard! I had good results with up to 12 inch Meade (even 14 inch Celestron EdgeHD) SCTs on my G11s.? I did use an extended counterweight bar to balance the C14 on the G11.?? However as Brian suggested to me, the G11T is a more massive heavy mount with the massive Titan worm system, more suitable to the C14EdgeHD scope.? That scope alone is about 62 lbs.? Here is a report about my PE tested on the smaller, older direct drive G11 system (non-tucked, non spring loaded).?? I did find one of my G11 tripod legs slipping (contracting,) under the extreme weight of the scope and heavy counterweights.? I think the total weight on the mount head was like ~125 lbs, and add the weight if the mount and that's like 170 lbs on the tripod.?? So be extra careful in looking for the telescoping tripod legs to be securely clamped.?? (A guess: perhaps one reason for slippage is that the mount leg surfaces are anodized and very hard surfaces. The anodized surfaces won't deform much so they may slip more easily than bare aluminum surfaces. ) As for the CRC grease: I generously painted that all around the massive Titan RA ring gear and worm.? The cap of the small CRC grease jar has a wire brush for the application.? As I've mentioned before, that grease had no reaction on test strip of brass, and it's soec sheet gives the same rating (bright) for the copper corrosion test as Superlube and ArcticJetlube.? That is: no reaction after 24 hours at 100C temperature.? So the worry from the AP group about some MolyD lubricants in extreme machine uses was not found in this brass worm application.? The highest pressure, and highest friction in the mount, is the worm to ring gear contact point.? That area is very small and all the torque on the axis is countered right there.? It needs the lowest friction lubricant that can stay put and handle the high pressure there.?? Best, Michael On Mon, Jun 28, 2021, 9:00 AM pcboreland via <pcboreland=[email protected]> wrote: Michael, |
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Re: New G11 Question Concerning Stiction
Thanks all.
I did balance the system by moving the ALT to 0.? The RA axis did move more freely and a good balance was achieved. I took the system out over two nights last week and it performed very well imaging the Fireworks galaxy with decent seeing and some wind on my 9.25" SCT fitted with a 0.7x focal reducer (FL = 1645mm) and an off-axis guider.? I used PHD2 with the Periodic Error correction algorithm on RA fixing the period to 239.34 sec.? Total RMS values ranged between 0.46 and 0.65.? The higher values came on the second night where there was more wind and haze.? I used my truck as a windscreen.? Control with Sequence Generator Pro worked without a hitch and the Gemini 2 Ethernet connection was flawless. Next, I will point to a target toward the south. Mark W |
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Re: Adding grease to existing greased worm and wheel
Thank you all for your input.? I have ordered some?CRC Brake and Caliper grease from Amazon.? It'll be here Thursday.? I have to say that it took quite a bit to sway me from Artic Lube.? What did it was the plethora of Artic Lube variants.??CRC Brake and Caliper grease had two variants, large and small.
Pete |
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Re: Adding grease to existing greased worm and wheel
Hello, I have done a study of the available greases. Here is the data: 4-ball test coeff of friction: CRC Brake and Caliper grease 4 ball wear scar 0.6 mm Timken load 60 lbs Copper corrosion 1B (shiny 100C 24 hr test) Arctic Jetlube recommended by Losmandy Max weld 200 Load index 25 4 ball Wear scar 0.7 mm Superlube with Syncolon ptfe 4 ball Wear scar 1.0 mm Timken load 40 lbs Copper corrosion 1B shiny 100C 24 hr test Super lube high temp and pressure grease 4 ball Wear scar 1.0 mm Timken load 50 lbs Copper corrosion 1B shiny 100C 24 hr test Shell AeroShell 33 (no MolyD) uses lithium.?? Copper corrosion 1B ( shiny 100C 24 hr test) No data on 4 ball test. Shell AeroShell 33 MD (with MolyD) uses lithium.?? Copper corrosion 1B ( shiny 100C 24 hr test) No data on 4 ball test. ____ Conclusion: CRC Brake and Caliper grease has MolyD, Graphite, and Teflon. It has the highest Timken bearing result (60lbs) and shortest 4 ball test result (0.6mm).?? Experience: ?on the G11T (titan RA): ?Super lube showed "chattering" in one worm direction rotation.? CRC Brake and Caliper grease showed no chatter.?Others protect told me of better results on their G11 with the CRC than Super lube. I bought but did not try the Arctic jetlube.? So... I recommend you use a cotton cloth to wipe out the existing lube, and put in the CRC Brake and Caliper grease.? Here is a picture of the container. The top lid has a brush to apply the grease.? It has antocorrosion ingredients that prevent damage to the brass worm in case you were to get a worm upgrade. Best regards, Michael ? On Tue, Jul 6, 2021, 11:44 AM Jim Waters <jimwaters@...> wrote: On Tue, Jul 6, 2021 at 11:16 AM, Brian Valente wrote: |
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Adding grease to existing greased worm and wheel
I have just finished taking out the backlash from my 1992 steel wormed CG11.? I had the gearbox off and the Oldham connector.? During this process I removed a small amount of lube from the bearings (reduced to thick guck) and from the steel worm gear.? Now it is all back together I see that the worms and gears assemblies? look a bit under lubricated.? I do not wish to dismantle the whole thing and clean off the old worm grease.? I would rather add a small amount of lube to what's already there.? Questions, what?
I quite like white lithium grease but am reluctant to mix it with what has already been doing a fine job since 1992. What product do I use on the worms please. Thanks. Pete |
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Re: Thank you all ...
I would not worry about the under-sampling per se.? At that image scale, you are probably going to target larger emission nebula. If you have enough subs, you can drizzle x2 or x3 and certainly improve the star shapes but unlikely to see much difference unless you are cropping the image down to a central target. -- Edward |
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Re: Thank you all ...
So after bashing my head a few times on the bahtinov mask I finally remembered it was a Carey mask and not a bahtinov after all !
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Michael Herman
Mark Wetzel
Pete
Edward Plumer
