Reggaeroo

Thanks. Had quick look and seems similar to one Martinsastrophotography or something like that did. Watched that one when originally rebuilt mine. Without looking think I watched another of his videos showing how to set up pec. When I done mine both axis were very stiff and now there free moving and smooth, but would of thought depends on your mount as to whether needs doing or not(Mine was very stiff but no reference for a new example) . Found it quite straight forward but finer tuning more tricky, make sure you test it running once without scope and then with. In my case def worth it. Spoke to someone about my mount and he agreed with Newbie alert and Michael that it's pe, and should go down that route. Like I said I've stripped it and put it back together and everything seems fine so might of sorted it(Hopefully), but will record a log not corrected and see what happens with pec. Have you ever tried training yours?

Fair play, I got given an old helios 200p and tried with that but wind,weight,balance and columation made it hard. Bought a little doublet in the end and never looked back, use helios with eyepieces and want to try with planets but I've also got 150mm mak so not used. Thought about a 150pds as an in between for certain targets but need to get on top of guiding first. Guidescope fitted directly in saddle?? I spent a hour watching the bloody thing go round and round earlier and cant see the belt slipping on either. You could move the backplate to create more of a wrap around on motor shaft, would get tight to the pinion wheel tho so need to be careful. Don't know for sure but after this afternoon I'd of thought the belt would stretch rather than jump because there to many other teeth engaged like you said. Think tightening belt could work more with yours because not directly fixed to a gear from belt having play in it. I'm glad you said spike still there with standard gear, was thinking of putting back in myself but ill leave them alone now. Just out of interest what power supply do you use?

Would've thought they be the same. My mount second hand so might be older version or a difference in manufacturing. When I got it didn't go through options, it was that's what you want so never questioned it. Someone had played with my mount before so makes you wonder. There's not really any play, just need to make sure grub screws touching but I just cranked up the first screw and it wobbled ever so slightly. When you put your kit on what difference did you notice. Phd, balance etc. Did you change much in the way you set up?

Mine wasn't, if you tip the mount over it would fall off the shaft without tightening grub screws. The other two were tight tho. Could see imbalance when looked at it without cover off. Stripped my RA this morning. Can't see any damage on worm gear or main, so it would be miniscule if damaged. Even spun worm in a jig I made for columating my lazer columator with lazer pointed on center and seemed straight from what I can see but who knows. Back together now, belt and cogs took off and reset, no binding, no backlash. Sat watching it to see whether the belt will skip a tooth and 3 rotations in nothing.

I'd try them both. Made mistake of not tightening the grub screws up evenly on motor when first put belt kit on. Noticed when ran with cover off but the slightest thing ruins everything. Trouble is you need a week of clear skies to try a few things out, but bad weather makes you become so precious about imaging time. The more I know the more problems I fix and then I seem to get double the problems. Haha, never satisfied. Yes, it's on the flat. Well I think my next step will be to strip RA. Clean, inspect and if it is damaged when I put back in ill move the wormgear up a few teeth. Hopefully its swarf and not damaged or bent tho. God know where i'd find a new wormgear. Would be nice to know who else has had this problem and how they fixed it.

Just updated after sent that. Cyclic drift??

Thanks for reply. I thought it would prob be mechanical. Thought backlash comp was enabled, must of missed it messing around linking camera at beginning. I cal after star alignment on vega, would that be why it was dec 38 and why i had the 5 steps of backlash? Pulsing north to clear backlash, used to do that on old eq3. Didn't think I needed to now guiding but will def try it. Thanks

Thanks for reply. I did run it with covers off when first rebuilt, but without staring at it for ages to see belt skip. More to see if belt moved side to side. Surely it's a case of playing till right or somethings bent or not lined up. I will refit gears but have you ever replaced belt(I have spares) or overtightened to see if force or way round. Or for me was thinking worm gear, moving it up/down a tooth in case of an imperfection in machining. Equal to if yours was bent shaft from motor, or cog not fitting right on shaft to cause imbalance. Need to look into it when have time.

Hi all. I have heq5 with asi120mc using in phd2 and I've attached a log report hoping someone might be able to point me in right direction. The problem is what appears to be random spike where total rms reading 0.6-7 then ra shoots off graph, then overcompensates the other direction before settling. when it settles rms is 1.7-8 and over next five to ten mins it will gradually come back round to 0.6-7 again. The mount was bought second hand and I have rebuilt it due to it being very stiff and and added rowan belt kit. It is better than before and the average rms dropped significantly but want to get to bottom of this spike because even tho stars acceptable I've just bought l extreme filter and want to push sub lengths. The log is very start/stop from phd2 not picking up guidecam, and also I stopped guiding to reposition cables, through night thinking it could be that. Mount seemed to be balanced spot on. The log is a bit over my head, so was hoping someone could have a quick look and let me know the good and bad so I can narrow down options and try to fix it. Be mechanical, software setting or whatever. Anyway, thanks for reading and any suggestions welcome. ThanksPHD2_GuideLog_2021-08-27_210514.txt PHD2_GuideLog_2021-08-27_210514.txt