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Device to tune a Lunt DS etalon for people with short arms?

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#1 torsinadoc

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Posted 21 January 2021 - 12:56 PM

I am looking for a device that allows tuning of my Lunt LS100FHA from the back of scope.  My arm is to short to reach it when paired with my 102/F11 refractor.  I'm considering designing and 3d printing the parts but maybe one is commercially available?



#2 rigel123

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Posted 21 January 2021 - 01:10 PM

This may sound silly but what about something as simple as a rubber wheel attached to the end of a metal rod that you could just use to reach the tilt wheel and rotate it.  Probably a bit awkward thinking about it a bit more.  The only other thought would be to attach a focuser motor to the front that would have the wheel on it that you could control from the back of the scope.


Edited by rigel123, 21 January 2021 - 01:12 PM.

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#3 torsinadoc

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Posted 21 January 2021 - 01:48 PM

That is what I was considering. I was going to design a 3d bracket that would hold a rod with a small handle (by the focuser). The rod would have another wheel to interface with the etalon.   


Edited by torsinadoc, 21 January 2021 - 01:51 PM.

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#4 rigel123

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Posted 21 January 2021 - 02:46 PM

I think Bob (BYoesle) built something like that a number of years ago.  It sounds similar.


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#5 torsinadoc

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Posted 21 January 2021 - 04:36 PM

I vaguely remember seeing a thread where he posted an image of it



#6 BYoesle

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Posted 21 January 2021 - 05:03 PM

 

I was going to design a 3d bracket that would hold a rod with a small handle (by the focuser). The rod would have another wheel to interface with the etalon.

 

I did use such a DIY device with a long rod and ball-ends, which were attached to the OTA with extra tube clamps, and rubber friction disc about 17 years ago with my longer focus single-stacked OTA:

 

OrionSolarTelescopes.jpg

 

My SM140 also uses such a device with a slightly different implementation.

 

I think ultimately doing a remote controlled motorized version is the best solution. Walter Lee made one to clamp on to the etalon:

 

Walter Lee Etalon Adjuster.jpg

 

Haven't seen much on this for over 10 years, however.


Edited by BYoesle, 21 January 2021 - 05:16 PM.

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#7 hopskipson

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Posted 21 January 2021 - 06:29 PM

For a motorized version talk with Leon from Rigel Systems.  We collaborated on a motorized Richview tuner for my SMII DS etalon.  I haven't had much good weather to try out the final design yet but it seems to work.


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#8 torsinadoc

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Posted 22 January 2021 - 10:32 AM

I did use such a DIY device with a long rod and ball-ends, which were attached to the OTA with extra tube clamps, and rubber friction disc about 17 years ago with my longer focus single-stacked OTA:

 

attachicon.gifOrionSolarTelescopes.jpg

 

My SM140 also uses such a device with a slightly different implementation.

 

I think ultimately doing a remote controlled motorized version is the best solution. Walter Lee made one to clamp on to the etalon:

 

attachicon.gifWalter Lee Etalon Adjuster.jpg

 

Haven't seen much on this for over 10 years, however.

Thanks the manual version gives me some ideas!



#9 briansalomon1

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Posted 22 January 2021 - 12:19 PM

I did use such a DIY device with a long rod and ball-ends, which were attached to the OTA with extra tube clamps, and rubber friction disc about 17 years ago with my longer focus single-stacked OTA:

 

attachicon.gifOrionSolarTelescopes.jpg

 

My SM140 also uses such a device with a slightly different implementation.

 

I think ultimately doing a remote controlled motorized version is the best solution. Walter Lee made one to clamp on to the etalon:

 

attachicon.gifWalter Lee Etalon Adjuster.jpg

 

Haven't seen much on this for over 10 years, however.

Personally, I like the mechanical version.




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