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Terabeam / Wegat ETX 125 OTA!

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#1 Escher

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Posted 26 September 2012 - 11:11 AM

I'm super excited! :jump:

Been wanting to try one of these baby's for a while and just found one on ebay... Turns out Jim had one he was selling. I should have it in a couple of days!

This will serve a couple of functions - primarily as a planetary scope, but also I may use it as a guidescope as well.

I read some archived posts about these which piqued my interest - anyone here still have one? I'm also very interested in the awesome Terabeam mount/drive some of the folks have.

#2 moynihan

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Posted 26 September 2012 - 11:48 AM

anyone here still have one? ...


Yes. An OTA. A Questar on steriods. Use for moon planets, mounted on a AT Voyager Alt-azm mount. BTW: if yours is coming without mounting rings, Scopestuff can help you figure that part out.

Interested in your impressions, after you get a chance to use it. :smirk:

I think if Meade brought the complete 3 ETX Mak line back, as OTA's with the build quality of these, people would pay for it.

#3 Escher

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Posted 27 September 2012 - 07:45 AM

As to rings...

I am making some custom - it will be much cheaper.

Turns out, Schedule 40 Pipe comes in a 6" ID with approx .25 wall thickness. I have several sections being cut for me which I will then drill for both mounting holes and centering pins. In total, I think you can make a set of nice sturdy rings for about $20-$30 dollars. I'll report back when I have something.

#4 Escher

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Posted 02 October 2012 - 11:10 AM

Made the rings - no pics yet... but I had to use hand tools since I did not have a drill-press at the time... so the scope and finder are not in-line, and I'm not very happy with the results... I may give it another go down the road...

#5 outlate75

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Posted 13 October 2012 - 10:55 PM

Escher, have you used the scope yet? I got one recently but have not tried to come up with a set of rings yet. One thing I noticed was only one of my sct accesories will actually thread on to the wegat back. Threads must not be quite right on this one.

#6 Escher

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Posted 15 October 2012 - 07:00 AM

The threads on mine are a bit messy - but they get better the more you use them. I'd suggest using some lubricating oil the first couple of times you thread something on until the burrs get worked out.. I have a couple of spots that are pretty hard to turn past.

I did make a set of rings out of 6" ID Schedule 40 steel. I drilles 1/4X20 holes (3 evenly spaced) in each ring and then use nylon /14X20 bolts to hold the scope. It works fine. I even attached a standard celestron finder and bracket to oe of the rings.

I'm actually going to go with production rings for a couple of reasons: 1) Weight - te steel rings I made are 2" wide and weight a ton. 2) I want a non- adjustable ring set - the nylon holds ok, but I really want a fully enclosed tube with felt all around it. I nearly lost the tube out the back of my rings one night while trying to center it to the finder... that was a potential disaster that I don't want to repeat.

and a side note.

** You will definately want to fully remove the rear cell and tighten the mirror retaining rings!!!!

Mine was flopping all over the place - I had to remove the rear cell and tighten it up and re-adjust the small springs that tension the mirror to the plate.

I have pics of the process, just have not had time to upload them...

#7 outlate75

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Posted 17 October 2012 - 01:29 PM

I've been looking for rings to fit without spending a fortune for them. Looked to me like getting some slightly larger and adding more felt would be the cheapest solution, but let me know if you find some that are a direct fit.

I haven't tried to check the mirror retainer yet, but thanks for the heads up.

When you did get the scope out, how did it perform?

#8 Escher

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Posted 17 October 2012 - 02:49 PM

I had it out two nights ago for a short view - got the double cluster and M31 - great views.. My collimation isn't perfect, but its close - not off enough for me to tear into it again!

I have the scopestuff rings on the way - they are a bit over size so you just add extra felt.






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