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Re: Adding grease to existing greased worm and wheel
Hi Greg, The CRC brake and caliper grease has added anticorrosion chemicals so the MolyDisulphide does not (through some chemical reaction) react and corrode the brass worm.? I'm not sure if your older grease has this so I'd say: get the new grease.?? I'm usually very experimental, but in this case the $100 brass worm value far exceeds the cost of a jar of the CRC brake and caliper grease. All the best, Michael On Thu, Jul 8, 2021, 8:01 AM Gregory Latiak <glatiak@...> wrote: Michael, |
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Re: Firecapture autoguide with Gemini 1 ?
I must question my own statement.... "In both cases you will need a special narrow 4 pin phone jack to get your laptop PC to talk to the Serial Port (marked "RS232" on the Gemini-1) to your laptop.? " Maybe you only need the Serial port cable if you choose not to use the RJ11 cable.? ? I always use the Serial port connection and ASCOM and Gemini.net.? I've never tried autoguiding without that already in place.?? Have fun, Michael On Thu, Jul 8, 2021, 3:49 AM Michael Herman via <mherman346=[email protected]> wrote:
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Re: Firecapture autoguide with Gemini 1 ?
Hi David, You have 2 options... here is how to use either way.? Most people use the "pulse guide" method by not using the RJ11 cable at all (option 2 below).? 1. Use a cable that came with your ASI camera to connect the RJ11 autoguider input port on the Gemini-1 to the RJ11 autoguider output port on the ASI camera.? If you choose to use this cable, then (in PHD2) you select the camera as "ASI" and select the mount type as "on camera" meaning on the autoguide camera.? ? 2.? Do not use this cable at all.??If you choose to use no cable, then (in PHD2) you select the camera as "ASI" and select the mount type as "ASCOM" and this will pop up.the mount "chooser" and you select the mount as "Gemini.net".? This option seems to me to work equally well as the wired option....with one fewer cable to worry about snagging.?? _______ In both cases you will need a special narrow 4 pin phone jack to get your laptop PC to talk to the Serial Port (marked "RS232" on the Gemini-1) to your laptop.?? For this purpose I make up a coiled serial port cable...has a 9-pin DB-9 connector to this special 4 pin phone jack for the Gemini-1.?? That cable plugs into a reliable ATEN UC232A USB to serial port device. The ATEN unit appears in your laptop as a Serial Port, and the ASCOM Gemini.net will usually automatically find the already powered on Gemini-1 from the serial port response.? See photo of this cable.?? If you choose to make your own cable, the Gemini-1 manual, attached, gives specs on these serial and autoguider? connections.?? See the attached PDF also for a step by step How-To.?? Have fun, Michael On Wed, Jul 7, 2021, 8:06 PM David Pitre <farmerpitre@...> wrote: So I¡¯m confused on the type of cable. (I have a USB3 cable from my ASI 174 to my laptop) The Gemini 1 controller has a RJ11 port for Autoguide. Do I need an RJ11 to usb to go from that port to my laptop?? |
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Re: Adding grease to existing greased worm and wheel
Hi Jim, There are several sources of backlash.? I'd list them as:. 1. Worm side movement along it's axis 2. Worm gap to it's ring gear 3. Other drive gears or Oldham coupler looseness. #2 is helped by lower worm to ring gear friction, because if that were frictionless you could push the wirm further into its ring gear.?? The other way to eliminate #2 on RA is to hang a weight from a cord wrapped so the weight hangs to the East of the RA axis.? #1 is eliminated by allowing the far bearing to slide in it's cylinder, and putting a spring (R4 size Belleville spring washer) behind it to push the worm toward the gearbox end.?? #3 is minimized by tightening up on the drive parts.? In all of this effort you must beware of creating tight spots in the drive. On Wed, Jul 7, 2021, 3:17 PM Jim Waters <jimwaters@...> wrote: On Wed, Jul 7, 2021 at 02:12 PM, Derek C Breit wrote: |
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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 |
Michael Herman
Mark Wetzel
Pete