Lichtenknecker Ha 150/3600 (F24) is completed

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Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

The week of work finally paid off. Tyrannosaurus Rex is done. :)
It will require minor adjustments to increase stiffness, but otherwise it seems to work. The sun is not in sight, so there will be plenty of time to finish.
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T-Rex
T-Rex
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T-Rex
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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by banjo »

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I dreamed it and you did it


bresser/messier 150/1200 (or 200/1800 Istar ) Mod -D-Erf 160mm intern-glasspath 1.25-etalon Pst barlow X2 ASI174
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sorry for my English translators google :mrgreen:
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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by arnedanielsen »

Beautiful scope! Really looking forward to see what you can achieve with this!

Best regards,
Arne


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by ffellah »

Love your new scope, Pupak. I am sure it will give great results !

Have fun with it. Franco :D


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

ffellah wrote: Fri Mar 24, 2023 10:44 am Love your new scope, Pupak. I am sure it will give great results !

Have fun with it. Franco :D
I love them all, but I already have quite a harem of my one-eyed lovers. :lol:


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by rigel123 »

Amazing looking scope!


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

I tested in the open doors of the workshop. Rain and wind outside. My test Chinese box survived everything unscathed. ;)
Collimation literally by eye. I have yet to make the ingredients. The first impression is that it shows something and that is the main thing. :)
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IMX533M BIN3
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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by MAURITS »

Amazing scope Petr, looking forward to see your first light with it.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

I have seen the light before, but not the miserable Sun and not climbing out. :lol:


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by DeepSolar64 »

WoW. Amazing work Petr!! This long focal ratio should work wonderfully with a Quark or any rear mounted etalon. T-Rex is a piece of art as well.

James


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by vineyard »

It wouldn't surprise me if some TV producers want to use that scope in a science fiction series (like some Moonraker scopes) - a slightly steampunk feel to it? Looks great!


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by DeepSolar64 »

vineyard wrote: Fri Mar 24, 2023 8:03 pm It wouldn't surprise me if some TV producers want to use that scope in a science fiction series (like some Moonraker scopes) - a slightly steampunk feel to it? Looks great!
Agreed!! :geek:


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by marktownley »

Brilliant!


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Rusted »

Your skills in design and fabrication are incredible. :bow

I see you have some large optical flats now. They really help in reducing the physical length of the folded assembly.

The combination of D-ERF and objective are a really heavy unit out there on the end of the OTA.
This increases the moment quite dramatically. As does the focuser and H-alpha filter assembly.

It will be interesting to see how you can stiffen the existing structure. The parallel bars are inherently flexible.
They offer little geometric moment. Each acting only in isolation rather than as a combination of them all.

If it were me, I would add a rectangular, box section, aluminium, mounting rail the entire length of the OTA.
Assuming you can source such tubing locally. It would provide stiffness out of all proportion to its added weight.
It would also look like a natural part of the design. I found such material is readily available in builder's merchants.
It is sold in lengths up to 3m, or more, as a straight edge for leveling concrete and wall plaster.
Sometimes they add bubble levels but at considerably increased prices. The tubing has a central rib for greater stiffness.
Plastic end caps provide attractive closure. They are plastic foil wrapped to maintain their high cosmetic appearance.

straight edge aluminium box section rsz 500.jpg
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10 in f8 newtonian rsz.jpg
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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Carbon60 »

A beautiful piece of engineering, Petr. It looks awesome. I’m sure you’re going to have a lot of fun and success with it.

Stu.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Petrus »

What a beast for solar scope! I admire your skills Petr.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

Rusted wrote: Sat Mar 25, 2023 6:27 am Your skills in design and fabrication are incredible. :bow
I see you have some large optical flats now. They really help in reducing the physical length of the folded assembly.
The combination of D-ERF and objective are a really heavy unit out there on the end of the OTA.
This increases the moment quite dramatically. As does the focuser and H-alpha filter assembly.
It will be interesting to see how you can stiffen the existing structure. The parallel bars are inherently flexible.
They offer little geometric moment. Each acting only in isolation rather than as a combination of them all.
If it were me, I would add a rectangular, box section, aluminium, mounting rail the entire length of the OTA.
Assuming you can source such tubing locally. It would provide stiffness out of all proportion to its added weight.
It would also look like a natural part of the design. I found such material is readily available in builder's merchants.
It is sold in lengths up to 3m, or more, as a straight edge for leveling concrete and wall plaster.
Sometimes they add bubble levels but at considerably increased prices. The tubing has a central rib for greater stiffness.
Plastic end caps provide attractive closure. They are plastic foil wrapped to maintain their high cosmetic appearance.
straight edge aluminium box section rsz 500.jpg
10 in f8 newtonian rsz.jpg
Since I have been working in mechanical engineering for almost 30 years, I already have some experience and, in addition, high-quality software for simulating the static and dynamic properties of structures. The rigidity of this system is very good, I just entered the focal length incorrectly and I need to add one more partition for the focus holder. Pipe extension is not good.
Of course, I welcome any advice and sharing of experiences, but in the end I still go my own way. :)


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Averton »

Another superb piece of engineering Petr.
Did you grind the mirrors yourself?
What are their specifications?


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

Averton wrote: Sat Mar 25, 2023 10:46 am Another superb piece of engineering Petr.
Did you grind the mirrors yourself?
What are their specifications?
The lens and mirrors are from Mr. Lichtenkrecker's workshop. It is a set from an older refractor. The mirrors are planar.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Averton »

pupak wrote: Sat Mar 25, 2023 10:50 am
Averton wrote: Sat Mar 25, 2023 10:46 am Another superb piece of engineering Petr.
Did you grind the mirrors yourself?
What are their specifications?
The lens and mirrors are from Mr. Lichtenkrecker's workshop. It is a set from an older refractor. The mirrors are planar.
Thanks Petr.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

So the editing is done. The top picture shows how the sharpener extension stresses the bend. The bottom picture shows the modified state, where the stiffness is significantly higher. The laser stiffness test of the structure showed a shift of the point by about 0.2 mm with a load of 8 kg at the end, which is 150% of the weight of the lens and DERF. At a focal length of 3.6m it is completely negligible.
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Final setup
Final setup
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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Averton »

pupak wrote: Sat Mar 25, 2023 4:34 pm So the editing is done. The top picture shows how the sharpener extension stresses the bend. The bottom picture shows the modified state, where the stiffness is significantly higher. The laser stiffness test of the structure showed a shift of the point by about 0.2 mm with a load of 8 kg at the end, which is 150% of the weight of the lens and DERF. At a focal length of 3.6m it is completely negligible.
Good solid build Petr.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pedro »

Beautiful telescopes


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by eroel »

Petr:
Beautiful design.
Best regards.
Eric.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Dennis »

Nice telescope design and machining.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by DeepSolar64 »

Dennis wrote: Wed Mar 29, 2023 1:37 pm Nice telescope design and machining.
Agreed. Enviable capabilities and skill!! :mrgreen:


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by Martin_S »

Wow that is amazing Pupak, you have taken solar imaging up to the next level.


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Re: Lichtenknecker Ha 150/3600 (F24) is completed

Post by pupak »

I am currently dealing with collimation issues. Each focuser has its optical axis somewhere else and most importantly never in the center of the tube. I will have to set up a single focuser and use that. Otherwise, the T-Rex works well. Mr. Lichtenknecker was a very good optician. I'm just trying not to spoil his perfect work too much with my own.


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