Re: Likely causes of DEC stall?
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Taylor - it's most likely due to the worm and worm gear binding. the other things you mention or possible contributors but unlikely to stall the axis (unless you obviously?see a cable that is taut). if you are even close to balance, it should be fine.
I remove everything when I adjust the worm mesh.?
How old is your mount? do you have the spring-loaded worms?
On Fri, Feb 28, 2020 at 9:13 PM taylor waber < taylorwab@...> wrote: [Edited Message Follows]
I added bearings and belleville washers per Michael Herman's suggestion to my GM811 (no spring loaded worms). Tonight I wanted to test things out but clouds started to roll in while I struggled getting things set up. When I first started to move the DEC, it stalled. I remembered I needed to adjust the worm while at colder temperatures outside (currently 35degF) instead of the 70degF I did while installing the bearings. So I took off my telescope, weights, and motors and adjusted the DEC and RA worms per Losmandy's YT video. Put things back together and I still had stalls in DEC. I thought it was balanced but might have been out of balance(but not by much). While slewing DEC, looking at the Gemini 2 hand unit the balance showed a PWM of up to 40% and one side of the Y bar going orange or red. The other side bar would extend slightly but not change color. It could have been my cabling, as I just changed my set up to have all usb cables going to a hub and power cables going to a hub. Both hubs are located on the telescope dovetail. I'm going to be organizing this tonight in order to not get any cable drag when moving DEC or RA. I should also note that my battery supplies 15V DC to the mount so I don't think that would be an issue, but maybe it is.
So worm adjustment, balance, and cable drag or a combination of the three are what I think were my sources of DEC stall, but is there others?
Do Losmandy users take the telescope, counterweights/bar, and motor off when adjusting the worm or does this just make it easier? It was way easier for me to feel when the worm would freely move if the scope, weights, and motor were off.
-- Brian?
Brian Valente portfolio
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