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How screw the comacorr to the focuser (or self center it)

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#1 ValeRyo

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Posted 25 June 2024 - 03:44 AM

I have a SW Quattro 150P and I always used Baader Clicklock for locking the comacorr to the focuser. Now I changed the focuser to a rack & pinion one that has a different threading on the focuser barrel: M54 x 0.75 instead of the M54 x 1 that comes with SW. So I can't use the Clicklock I have and the stock compression ring on the focuser can't be used ad it introduces too much decentering on the comacorr - oag - camera assembly. What can I do to improve the connection?

 

Of course the easiest solution is buy a new Clicklock with M54 x 0.75 thread, but spending more than 100$ it hurts a bit... So what are my alternatives?

 

This is my comacorr:

 

CRC2095.png

 

and this is the focuser:

 

Focus-telescopio-da-viaggio-42-mm-CYCK-con.jpg

 

if I unscrew the blue compression ring, there's the said M54 x 0.75

 

 

Is there any way to screw the comacorr directly to the focuser tube? Is there any not-so-expensive self centering piece for holding the comacorr?



#2 mrowlands

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Posted 25 June 2024 - 02:01 PM

As a general rule, any specialized part that has accurate dimensions is going to be pricey.  In the meantime, you could try shimming the barrel with something like strategically placed Scotch tape.  The only downside is that you might have a sticky mess if/when you have to remove it.

 

Mike R.



#3 ValeRyo

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Posted 02 July 2024 - 02:29 AM

a new problem: I bought a M54 x 0.75 Clicklock but being it thicker than the stock blue compression ring, I can't reach focus as the drawtube is totally retracted and I'm not reaching focus yet. Anyone got into this too? Is there any way I can solve this problem?



#4 mrowlands

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Posted 02 July 2024 - 07:34 AM

If you're close, you might try to move the primary toward the focuser via the collimation screws.  You might need stiffer springs though.

 

Mike R.



#5 ValeRyo

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Posted 02 July 2024 - 09:00 AM

ok, I'll try this. In case it's not enough?




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