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Lunt LS60THa DIY remote focuser and pressure tuner

astrophotography DIY solar 3d printing
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6 replies to this topic

#1 avzaid



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Posted 22 February 2018 - 10:50 AM

Recently I purchased Lunt LS60THa solar scope so I could image the sun spots and prominences, I was so excited to use it with ZWO ASI290MM, I did came up with nice images but it was really annoying trying to focus and pressure tune in day light as you can barely see the screen.

I could setup a dark box outside like most people do, but I figured it would be more challenging if I could control the whole thing remotely like I do with my telescope when I image the moon.

Controlling the mount is not a problem, but designing a remote focuser and pressure tuner is a big challenge especially that the pressure tuner requires a lot of torque to rotate, I did a search and it seems that Lunt already have a remote pressure tuner but this thing is $650 and I just find that a lot.


So I decided to design my own thing and 3D print all the necessary parts, below are the parts that I needed.

The items that I designed and 3D printed are

  • Small Pinion 3D-01.jpg
  • Big Pinion 3D-02.jpg
  • Pressure tuner clamp 3D-03.jpg
  • Mount to install the stepper motors on 3D-04.jpg


Below Images shows how all those pieces are mounted


3D printing two pressure tune clamp



The Clamps are screwed together and I put double side tap to secure them to the pressure tuner knob



Both gears 3D printed



The gears are installed and roughly that’s how they will look like



3D printed the motor mount and both stepper motors are fit inside with gear and pulley secured



The whole setup is installed, the motor mount sit on the focuser tube with double side tape in between and secured with zip ties, pulleys are installed and I cut a small piece of the belt and glued it to create a loop to connect the focuser with the stepper motor, the other side you can see the big stepper motor is connected with the pressure tune knob with gears and there is enough torque to rotate that knob all the way in.

IMG_20180210_205342.jpg IMG_20180210_205549.jpg IMG_20180210_210457.jpg

IMG_20180210_210034.jpg IMG_20180210_210144.jpg


Electronics are nicely arranged inside a small plastic box and cables are connected, everything will be powered from a 12V DC source, I did a test and I am happy with the results.


  • BYoesle, Mike Phillips, drprovi57 and 14 others like this

#2 CosmicWreckingBall


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Posted 22 February 2018 - 11:35 AM

WOW!  Awni, this is fantastic.  And how wonderful of you to share it with the community!  I've often hoped for something like this when fine tuning on a prom.  I'm itching to buy a 3D printer. smile.gif  

Edited by StarFood, 22 February 2018 - 11:35 AM.

  • Mike Phillips likes this

#3 p1taylor



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Posted 11 January 2021 - 04:39 PM

Hi, Is there a chance to get setup of 3D print all the necessary parts so I can print a set for my Lunt 60mm.



#4 Mike Phillips

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Posted 11 January 2021 - 04:59 PM

This is fantastic and the #1 reason to get a 3d printer if you ask me! :D

#5 p1taylor



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Posted 11 January 2021 - 05:04 PM

I have 3D printer just need info to fed in to do all the bits.



#6 spereira


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Posted 11 January 2021 - 05:48 PM

Moving to Solar Observing & Imaging.



#7 chemman



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Posted 11 January 2021 - 11:25 PM

Wow, that is very cool.  I wanted to remotely change the PTs on my Lunt and checked into the offering by Lunt.  When I spoke with them they  did not know when their pressure system would again be available.  I purchased the hose adapters to convert to an external pressure supply from Lunt and have a plan for a pressure regulator/manifold and 0-25psi air pump.  I have not built the unit yet but will soon.  


I do like what you have designed and have an idea for a drive that could use a 12V 15rpm high torque motor I have laying around.  Would you be willing to share some of your STL files for the bits on your PT?  The focuser is very cool too but  I have an electronic Crayford focuser I use. 


I use an Ultimaker 2 3d printer and love making things with it.  Not very good at cad so usually need source STLs unless It is a pretty simple design. 


Here is the Lunt pressure piston with a silver sharkbite fitting for a 4mm pressure hose on the end.





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