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adjusting Micro-Edge focuer knobs on a TOA-130

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#1 magyar

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Posted 01 August 2020 - 12:40 PM

Hi guys,

I'm having an issue with the focuser on my TOA-130NFB that I'm having a hard time with. I've found a number of threads on a similar subject, but none that solves my problem.

The large knob on the stock micro-edge MEF-4 it came with has a large amount of "slop", where reversing the direction of rotation causes it to slip. The smaller fine-focus knob on it hits the same slip point after a full rotation.

I see that there are a couple set-screws on the inner barrel that can be tightened down securely on the focuser axle (that the pinion is attached to) to eliminate the slippage completely. The problem is that there's no way to actually get to the set-screws once the knob is inserted into the focuser, as they're covered up.

The standard knob on the other side of the axle is on securely on, and there's no slippage at all.

 

Can anyone tell me what the trick is to tightening down the set-screws on the MEF-4 so that the knob doesn't slip anymore? There's got to be some non-obvious trick to adjusting it properly, but so far it's escaping me.

Many thanks!



#2 edif300

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Posted 02 August 2020 - 02:56 AM

The large knob in the other side of MEF has too?

 

(If not: locate a hole in the MEF's large knob, there is a hex set screw in there and tighten it.)


Edited by edif300, 02 August 2020 - 05:00 AM.


#3 magyar

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Posted Today, 10:31 AM

I'm not sure what you're actually asking about the MEF large knob.

 

The large knob does have a set-screw as well, but the focuser's pinion axle (is that even what it's called?) doesn't extend out far enough for the large knob screw to engage. It only extends far enough into the MEF for the inner-most set-screws to make contact.



#4 edif300

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Posted Today, 04:48 PM

The MEF’s small knob (black one) has a setscrew. Please tighten it. The MEF’s large knob (Aluminum color) has also a setscrew, tighten it.

If after this doesn’t fixed it, I think you must go to disasembly the focuser pinion housing ... better make a call to Tak.


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