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CGEM pedestal

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#1 SchrödingersCat

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Posted 13 January 2010 - 07:02 AM

I am looking for a pedestal for a CGEM (not portable or fixed pier). Any ideas?

#2 SchrödingersCat

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Posted 13 January 2010 - 05:16 PM

bump

#3 Lane

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Posted 13 January 2010 - 08:36 PM

Not portable and not fixed - what else is there :question:

#4 Lane

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Posted 13 January 2010 - 08:41 PM

I use THIS on top of my CGEM Tripod and it works great.

I did replace the upper hex bolts with hand screws to make it easier to remove the mount from the pier.

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#5 John J

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Posted 14 January 2010 - 12:57 AM

I use this on my EQ 6 and it should work on the CGEM.

http://www.telescope...mount-extension

#6 SchrödingersCat

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Posted 14 January 2010 - 05:27 AM

I guess I wasn't very clear. I am looking for something like this that will fit the CGEM.

#7 bdawg6381

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Posted 14 January 2010 - 01:15 PM

Based on their pictures on the bottom the connection looks very similar to the CGEM connection on its standard mount. I would look at the link of the CG5 head dimensions and see how similar the footprint is compared to the CGEM head. Just at a quick glance it appears that it would work to me - only thing I would be worried about is the threads on the center bottom of the CGEM head matching with the threads they use for the CG5.

#8 SchrödingersCat

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Posted 14 January 2010 - 02:35 PM

I know there is a thread for CGEM dimensions . Is there one for the CG5?

#9 jrbarnett

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Posted 14 January 2010 - 07:07 PM

The CGEM and HEQ-6/Atlas share the same "bottom". I wonder if the HEQ-5 (pictured) also has the same "bottom" as the HEQ-6? If so, there's your solution.

Regards,

Jim

#10 SchrödingersCat

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Posted 14 January 2010 - 07:39 PM

This page says the antares is not compatible.

#11 SchrödingersCat

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Posted 14 January 2010 - 08:29 PM

Are there really no pedestal options?

#12 JadeSmith

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Posted 17 January 2010 - 10:22 PM

Maybe a custom plate on top?
Custom Plate

There are other portable pier makers besides Antares, but they will cost more than a CCGEM!!!

#13 achronut

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Posted 18 January 2010 - 03:52 AM

I use THIS on top of my CGEM Tripod and it works great.

I did replace the upper hex bolts with hand screws to make it easier to remove the mount from the pier.


Your post confirms my intention of using an Atlas extension for use on a CGEM. I emailed an Orion rep and he said that the Atlas extension would not work with a CGEM.

Anyway, it seems that the Atlas extension works pretty well on a CGEM mount and tripod. I'm planning of getting one. Thanks.

#14 shwright50

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Posted 18 January 2010 - 02:05 PM

I just picked this thread up. I have a new CGEM and would be interested in raising the height of the mount without increasing the length of the tripod legs (for reasons of stability and room in what is otherwise rather cramped space). The Orion solution shown in Lane’s post is interesting, but I seem to be missing something. How do the azimuth adjustment screws of the CGEM work when placed on this pedestal? Based on the image shown on the Orion link, there is no place for the alignment peg against which the azimuth adjustment screws push….?

Steve W

#15 Lane

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Posted 18 January 2010 - 04:28 PM

1. The CGEM and ATLAS tripod tops are identical, so this entension works the same on both.

2. Pictures on the vendor sites always show the tripod extension upside down for some strange reason, so don't let that confuse you.

3. You will unscrew the alignment peg from the CGEM mount and screw it on the top of the extension instead. Which means there is nothing to keep the bottom of the extension from turning on the mount except friction. Some people on this site have complained about that happening when they accidentally bumped into the OTA. I put a strip of duct tape around the inside hole on the top of my CGEM mount to make the fit much tighter and increase the friction to the point where mine does not turn, no matter what I do to it.

4. It is a good idea to replace the 3 silver hex screws with longer bolts which you should be able to obtain from ACE harware. This is a good idea because to separate the telescope mount from the extension you will be removing these bolts every time you setup and takedown the mount. They are small and easy to drop in the dark. I would not even own this extension without the replacement bolts. I will include some pictures of the bolts in my next posting.

#16 Lane

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Posted 18 January 2010 - 04:34 PM

Here is a picture showing the top part of the extension, which will attach to the bottom of the mount. Notice the bolts I bought. The 3 bolts will go through the outside of the extension tube and then into this device, which is what holds the mount in place on top of the extension tube. Notice also that I added a long "tube-like" washer to the bolts, I think these may be called collars. This is necessary to move the bolts out to where you can turn them and so they don't hit the top of the extension.

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#17 Lane

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Posted 18 January 2010 - 04:37 PM

And here is another pic:

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#18 shwright50

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Posted 18 January 2010 - 04:51 PM

Thanks Lane. Very clear. And it looks like it might fit my needs perfectly!

Cheers,

Steve W

#19 JS999R

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Posted 01 January 2013 - 05:28 AM

I know this thread is old, but new to me. This is exactly what I'm looking for. I just bought a CGEM and already had conflict between the tripod legs and 45" refractor slewing around zenith. I had the longer Orion pier on my CG5 and it worked great with extra benefits like easier viewing, no need to extend the tripod legs and actually the pier made it easier for me to carry the set up around in one piece because I could rest the pier on my hip in a balanced position. I did have to collapse the legs to allow passage through a couple doorways, no bigge though.

#20 oo_void

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Posted 27 February 2013 - 12:51 PM

Sorry for bumping this one, but does anyone know the size of the allen screws. I'm guessing 1/4 20 (but I've made that mistake before). Thinking about using something like these ... http://www.scopestuff.com/ss_lscr1.htm

#21 Lane

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Posted 27 February 2013 - 01:52 PM

Metric - M6

I bought mine at a hardware store and they were a little to long so I cut them down to 36mm and then attached a 2mm washer followed by an 18mm long metal sleeve using some glue. The washer and sleeve are necessary because you need to push the knob out away from the mount so it does not hit the mount. That leaves 16mm's of threaded area still exposed to attach the mount.

I think the M6-30mm at Scopestuff will probably be to short. Try an ACE hardware if you have one nearby. I found my bolts and sleeves at Elliot's hardware, but I think they are just a local chain. You can forget about Lowes and Home Depot they don't carry stuff like this in Metric sizes.

If you have never cut a bolt like this, you just need a hacksaw and a file. You have to file all the rough spots away and make a new starting groove on the bolt. Otherwise your bolt could destroy the aluminum threads on the mount. Best to get a 6mm nut and get it working with that first before you try to attach it to the mount.


#22 oo_void

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Posted 27 February 2013 - 07:35 PM

Thanks Lane, very helpful ...






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