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Old 14-06-2012, 08:39 PM
slang (Steve)
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Join Date: Feb 2010
Location: Auckland
Posts: 1
Quote:
Originally Posted by mldee View Post
That turned out to be the case. I opened it up this morning and noticed that the four little countersunk screws that attach the guide rail, which is actually a nice little linear ball race, were very loose. GSO QA seem lacking, but the fix was free....

A bit of experimentation with tightness as you said, and hey presto, solid as a rock in all directions. Also took a few goes to work out optimal tightness for the four Allen screws that hold the focusser shaft to the body, but eventually all came well.

BTW, for anybody who wants to check their setup, the optimal ball-race guide screw tightness on mine was just as the four screws started to feel firm. The test is to ensure the tube slides up and down freely with the focuser shaft assembly attached but its tension screw not tightened.

I have never had a problem with the 25cm spacing, the spacers provided are built like a tank and rock solid, and if you're going to have a Crayford style focuser plus an OAG plus a FW plus a CCD, 250mm seems about right. I'd rather have it that way than most cheap Newts with the reverse problem. My Megrez also needs a fair amount of junk hanging off the back, so it ain't just GSO RC's.

Overall, for my needs in DSO happy snaps, I find the RC8 to be a very acceptable instrument indeed. Beats my mirror flopping C8's. YMMV

Couple of pics attached for those who may want to check theirs.
Most excellent indeed. I noticed the same problem, and had googled it several times to no avail. Even missed out on a second hand Feathertouch as a replacmeent...

Looked again tonight, found this thread, tightened my screws and tested. All AOK!

MOST EXCELLENT INDEED. Thank you very much!

Cheers -
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