Author Topic: Side by Side mount on a GOTO GEM  (Read 5747 times)

tenpaseper

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Side by Side mount on a GOTO GEM
« on: December 24, 2017, 07:34:03 PM »
Question. When adding a side-by-side installation to my CEM25 (Vixen design) dovetail bracket, do I want to physically unbolt the dovetail mind and rotate it 90 degrees, or can I just rotate the head 90 degrees in DEC and  zero it out at the GOTO alignment procedure?

CF



Tommy Schmidt

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Re: Side by Side mount on a GOTO GEM
« Reply #1 on: January 11, 2018, 02:12:40 AM »
You can just rotate the head and then set a new zero.

P.S. - By zero, I mean establish the park position with the new orientation. The head may not rotate to exactly 90 degrees, a gear thread may be a tad off, so you'd want to get everything level and properly set again to be sure. Then it will just work like it did before. The mount doesn't care how you orient the head. At least, that's the case with the ZEQ25.

Travis Vega

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Re: Side by Side mount on a GOTO GEM
« Reply #2 on: January 12, 2018, 01:56:20 AM »
On my CEM60 I only had to remove the screw that prevents it from rotating beyond 180 degrees. Then just find zero & loosen & rotate the mount. You best be careful with the weight. My CEM60 can just barely handle a C8 + a 81 mm refractor+camera..

JPK

Jimmy Harbaugh

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Re: Side by Side mount on a GOTO GEM
« Reply #3 on: January 12, 2018, 07:44:35 AM »
Thats what I thought. My new CEM25 must be messed up then. After all the setup, and accurate date,time, location, it try to locate targets in the opposite side of the sky. That's why I wondered if the SBS setup was screwed up.

taibedaha

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Re: Side by Side mount on a GOTO GEM
« Reply #4 on: January 13, 2018, 03:54:58 AM »
I only have one 60mm guidescope, a Sigma telephoto lens and a Canon 6D. That should not be too heavy.

byhodete

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Re: Side by Side mount on a GOTO GEM
« Reply #5 on: January 20, 2018, 04:17:00 PM »
Quote
Thats what I thought. My new CEM25 must be messed up then. After all the setup, and accurate date,time, location, it try to locate targets in the opposite side of the sky. That's why I wondered if the SBS setup was screwed up.

I have seen this happen on my ZEQ25. It acts as if the time and date are at UTC, and the pointing is trying to match that setting. I'm not certain, but I think I "fixed" it by going to the time, date and UTC offset screen, even if all I do is go there and hit enter, then it points fine. I also think it wasn't an issue if I waited for the GPS to lock on before trying a goto.

On the ZEQ25, the DEC head can rotate freely, its position is arbitrary as far as the mount is concerned, so there is no relationship to how the mount points and how the head is oriented. So if you are having a pointing issue, it's probably a time or GPS thing.

Good luck

Adam Martin

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Re: Side by Side mount on a GOTO GEM
« Reply #6 on: January 21, 2018, 04:11:18 AM »
Same with my CEM60. If such an issue arises then recheck the time & date settings as the first step.

teirazaro

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Re: Side by Side mount on a GOTO GEM
« Reply #7 on: January 21, 2018, 01:47:54 PM »
Quote
On my CEM60 I only had to remove the screw that prevents it from rotating beyond 180 degrees. Then just find zero & loosen & rotate the mount. You best be careful with the weight. My CEM60 can just barely handle a C8 + a 81 mm refractor+camera..

JPK

Hi JPKellysr - could you possibly kindly point out the screw that needs to be removed to allow rotation beyond 180?

Ronald Bryan

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Re: Side by Side mount on a GOTO GEM
« Reply #8 on: January 21, 2018, 03:14:07 PM »
On my CEM 60 it was under & on the front of the mount head. When it does a 180 rotation the screw hits a metal ridge that stops the mount head. I just unscrewed it. If you can find it then try to rotate the mount head over 180 degrees & see what blocks the motion.

penliipamex

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Re: Side by Side mount on a GOTO GEM
« Reply #9 on: January 31, 2018, 02:04:02 AM »
Quote
On my CEM 60 it was under & on the front of the mount head. When it does a 180 rotation the screw hits a metal ridge that stops the mount head. I just unscrewed it. If you can find it then try to rotate the mount head over 180 degrees & see what blocks the motion.

Doesn't the CEM60 DEC head have power, usb, and other cables running through it? If so, be careful rotating it. There may be a reason for the limit screw.

Stanley Elliott

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Re: Side by Side mount on a GOTO GEM
« Reply #10 on: January 31, 2018, 01:32:42 PM »
<sub>Yes it does. I watch that carefully. It is easy to keep track of.</sub>

Jack Jefferson

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Re: Side by Side mount on a GOTO GEM
« Reply #11 on: February 04, 2018, 11:39:42 AM »
Sorry I never came back in here to say that I solved the problem. Both my RA and DEC motors were wired backwards. IOptron sent me instructions to tear the mount apart and rewire the two motors. Obviously their quality control was not effective. Now that the motors are running correctly, everything is fine now.