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I've set my scope up on it's pier in my ROR observatory, done a few drift aligns and started to take some images.
I've noticed a 'quite' regular dip in my DEC line on several nights.
Would anyone be able to have a quick scan of my log and offer any insight?
Could it be backlash? Could it be something with each rotation of the gears? Faulty tooth?
It is quite regular, although not always, and always in the same direction.
It doesn't seem to be adversely affecting imaging yet, but I've not tried anything too taxing.
Recently I opened my AZ-EQ5 mount for adjusting and greasing.
I did not find any complete tutorial for this nor worm or bearings dimensions. I plan to replace some of those if I have the chance.
Meanwhile, I will add some pics of the disassembly process.
Open the plastic top case. Please excuse the USB hub attached, I did not remove that.
Pull out the cable connectors. Put the top case with the controller board aside.
The bolt inside the green circle can help you remembering or adjusting the belt tension. Loosen down the RA motor screws. Remove the belt. Unscrew the bolts. Remove the motor.
The bolts inside the green circles can help you remember and adjust the worm distance to the RA main gear. Remove the bolts holding the worm case.
Parts: RA main gear, worm case.
Remove the screws holding the encoder board. You get access to the nut holding the worm in place. Remove this too.
Remove the bolts inside the driving gear attached to the worm. Sorry, not the best pic.
You can now proceed to push out the worm and the bearings. No pics for this, sorry.
The bearings are 688Z, 16mm outer diameter, 8mm inner diameter, 5mm width.
Worm dimensions measured with the caliper: 69mm, 36mm.
Hope someone finds this useful.
I'd be interested if the worm is identical to the ones used in the HEQ5.
Here's a quick guide to adjusting the tightness on the Dec and RA axes on the AVX mount. Freeing up the axes means better guiding, less wear on gears and motors (some gears in the drivetrain are plastic), lower worm PE and you will be able to balance more precisely.
Remove the counterweight bar and cup to reveal the tension ring. To adjust this first loosen the 2 grub screws at its side... there is a small access hole at the side of the housing. You'll need a tiny allen key to do this. Then use a slightly larger, stiffer allen key and insert this into the access hole and against the grub screw so that the tension ring is wedged tight against the allen key - this serves to hold the tension ring in place as you turn the axis, no need for a special tool! Now rotate the mount saddle anti-clockwise to loosen the tension ring until you feel some vertical play (grab hold of the saddle and move up and and down to test). Slowly tighten until there's no play. Tighten grub screws.
Remove the plastic cup at the end of the axis. The RA tension ring has 3 grub screws and the access hole is hidden by the control panel cover (3 screws hold this in place). My RA axis was very tight and needed a few turns of the axis before I got any vertical play.
For those wishing to improve their AVX further I recommend adjusting the worm housings in both axes.
Hi, I'm trying to figure out what is the difference between RA, DEC vs Azimuth, Altitude difference. I watched dozens of videos and read a lot of material and I think I got it all mixed now.:)
From what I understand, if I want to find a star using let's say a telescope than I would need to know RA and DEC which I can get from an app or a chart. (Is there a professional way?)
But if I want to point at a star as an observer than I would use an Azimuth and Altitude?
I am considering getting a QHY Polemaster for my AZ-EQ5 mount. Has any one used this combination and did it work well? Also I have heard that the Polemaster can wash out if light pollution is present, how much of a problem is this? The light pollution is not bad but I have to look over the house to see Polaris and I wonder could overspillfrom it wash out the Polemaster. I would suppose this to in part depend on how wide the Polemasters' field of view is. Any observations and advice would be welcome.