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Post by Ron Walker on Jun 13, 2022 14:25:36 GMT -7
Posted by: Philostopher1 Oct 28 2017, 01:08 PM QUOTE(mrgare5050 @ Oct 28 2017, 03:24 AM) * Sanity is overrated - I haven't had much to say on this thread because, this is a niche in home planetariums that is to my mind unique, have we ever seen such high end engineering in pinhole projection, fantastic! I've often eyed beads in Hobby Lobby as the source of very cleancut star holes. Or maybe I secretly want to wear them. As a person who has extension cords that run into walls and I don't know where they go anymore, I can't contribute much but encouragement here!
How many niches in home planetariums are there? They blend seemingly - the legacy commercial (large and small), the homemade, the so called toy's which really arent toys, the high end video projection. I BOUGHT some homemade projectors, which is another iteration, preserving AND using them. The hybrids, combining parts of commercial and homemade. Its a large umbrella seemingly. Multi-faceted indeed.
Hi Gare (or Gary?)
This is a unique, obscure and eccentric endeavor. Most people don't know what a Planetarium is anymore. I was at the eye doctor yesterday, and talking about me need for glasses for astronomy and my planetarium project. She (the technician) asked, "What's a Planetarium?" ...sigh... She probably thinks astronomy and astrology are the same thing...
I'd like to get a Sega Homestar. I have a Spitz Jr. I put a Streamlight bulb in. I used to have a GOTO M1. That got lost in a divorce type situation. I feel sick just thinking about it. Video has come a long way. There is a lot of free open source software for edge-blended video and multiple projectors. The resolution, size, cost and technology is now very accessible to the hobbyist. However, to me there is no romance in video. I love the technology but walking into the dome with the machine in the middle is awe-inspiring. There is some art, mystery and other-worldliness to it. Besides optical stars, even with pinholes look better than pixels. That may change.
I think I posted this somewhere in these threads but I'll share this again.
In 2008 I went to Manhattan for New Year's with my ex. We saw three Broadway Shows, and Chick Corea at the Bluenote on New Year's Eve. The highlight of the trip for me was to be the Hayden Planetarium as they were supposed to have a Zeiss Universarium projector. As we know this is the finest optical Planetarium projector that money and technology has achieved.
We walk in to take our numbered (!) seats, and my eyes are fixed on the empty floor in the middle of the dome. "Where is the projector!?" We settle into our seats and I notice that the floor has two rectangular panels. I am in denial thinking they will open and the projector will majestically rise into position out of the pit. Then the usher starts going over the rules and pointing out emergency exits. I look over my shoulder at her and she's standing by the door we came in at. Now it's dawned on me that there is no console in the room and I am feeling panicky. She finishes her robotic, dry, uninspired speech, opens a small panel with two large illuminated buttons, one green and one red.
She pushes the green one closes the panel and steps out the door as the cove lights slowly dim. A moment later music swells up and washed out titles of the show appear on the huge dome from a plethora of video projectors. This was hands-down the most dissapointing moment of my life. Seriously.
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Post by Ron Walker on Jun 13, 2022 14:25:57 GMT -7
Posted by: mrgare5050 Oct 29 2017, 01:22 AM
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Post by Ron Walker on Jun 13, 2022 14:26:17 GMT -7
Posted by: Philostopher1 Oct 29 2017, 03:08 PM Hi Gare
Building the projector as professionally as possible is the primary goal. It is a test of my skill and organization to express this unusual passion.
People ask me, "Why are you doing this?"
My response is that some people spend their precious hours building intricate model ships. I am building the stars to sail them by. It's a romantic passion of mine that ties into my childhood. My parents donated industrial machinery time to build the OMSI Kendall Planetarium (see pic). From the time I was a baby I had my own chair with my name on the arm rest, second row in on the left side of the console! I spent my weekends there as I grew up. Later I acquired the GOTO M1 "spare".
I had started to build a dome for it in Lewiston California, but we lost our house and property, and all the building materials and construction that had begun. Now I live in a retirement mobile home park on a fixed income. There is just enough room to build a 16-foot dome here.
My plan is to complete a small Planetarium with edge-blended full dome video. There is a need for full-dome content in education and edutainment. My career was in laser light show production and development for these markets as well as corporate and rock and roll. So I hope to have a small business for a bit of extra income from home. That isn't crucial though.
The part I am looking forward to is having friends over for shows, and getting back in touch with the amateur astronomy community. I am drooling over the Orion XX12G GoTo Dobson.
Broadway shows
I have seen many. My favorites are Phantom of The Opera, Les Miserables, and Mary Poppins. Mary Poppins was over the top!
My hometown planetarium. OMSI moved to a new location with a separate Omnimax theater and digital sky theater. It's all video now...
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Post by Ron Walker on Jun 13, 2022 14:26:38 GMT -7
Posted by: Ron Walker Oct 30 2017, 11:34 AM QUOTE(Philostopher1 @ Oct 28 2017, 12:31 PM) * You're right they would be fine, and there is plenty of torque with a 27:1 planetary gearhead on the motor. Again, it's an aesthetic issue, and I want to prove the concept of making starballs in this way as another option. I got a great price on the hemispheres but they are generally very expensive. The average among all the quotes was $1500 for the pair!
Also, the idea here is to be able to reproduce this project with readily available parts and materials through Amazon.
Beads and alignment.
I made some crude drawings that may help share my concept.
The idea is to cut identical sheets of aluminum from pie tins, brass shim stock, or cinefoil. The sheets are stacked together, and the pinholes are drilled in bulk.
A grid is scribed on the top sheet creating a drilling guide. E.g. a 10x10 grid on 10mm centers. This way one can stack 10 sheets, drill 100 holes and have 1000 pinholes etc. This allows the drilling to be done on a drill press with more precision, and less bit breakage, especially for #80 bits.
As I learned from others the best way to make pinholes, aside from laser drilling, is to punch or drill the material and then sand the dimple down through 3 grits. This creates a more diffraction limited hole. So each sheet is sanded through 3 grits with an orbital sander and cleaned.
A jig is made to neatly receive the pinhole sheet without shifting around. The sheet is used as to mark the centers for the jig. From here the jig is drilled through with holes to allow a small finishing nail to be inserted. An extraction tool is made -think bed of nails- that will push up through all the holes in the jig simultaneously.
The jig holes are drilled on the receiving side just large enough for the desired bead to be inserted and stand a few thousandths above the jig surface. Once the beads are inserted spray glue is applied (TBD but probably 3M-90) the pinhole sheet is then laid over the beads and clamped for 10 minutes or so.
Then, the part is extracted and individual star holes with their beads are cut up for mounting in the starball.
From here, each star is individually placed in its location through a hole large enough to receive the bead and pinhole, and epoxy to secure them. The process ought to orient the clear aperture to the lamp. Any off axis errors will be miniscule.
Yes, this is a lot of work. It's not necessarily the most efficient method, but it is the one that will yield the aesthetic and quality I am looking for.
OK, now I see what you are doing. The hole in the bead is much larger then the star pinhole so there is no problem with a slight misalignment. Being a lazy person I would just glue each "star hole" directly onto the main star ball and save all of the bead work, but I can see that would add to the aesthetic of the projector itself.
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Post by Ron Walker on Jun 13, 2022 14:27:01 GMT -7
Posted by: Ron Walker Oct 30 2017, 11:53 AM QUOTE(mrgare5050 @ Oct 28 2017, 03:24 AM) * Sanity is overrated - I haven't had much to say on this thread because, this is a niche in home planetariums that is to my mind unique, have we ever seen such high end engineering in pinhole projection, fantastic! I've often eyed beads in Hobby Lobby as the source of very cleancut star holes. Or maybe I secretly want to wear them. As a person who has extension cords that run into walls and I don't know where they go anymore, I can't contribute much but encouragement here!
How many niches in home planetariums are there? They blend seemingly - the legacy commercial (large and small), the homemade, the so called toy's which really arent toys, the high end video projection. I BOUGHT some homemade projectors, which is another iteration, preserving AND using them. The hybrids, combining parts of commercial and homemade. Its a large umbrella seemingly. Multi-faceted indeed.
We are all "nuts" in one way or another but we are in the stratosphere of "nuts". For every 1,000,000 that tinker and rebuild carburetors (I guess they don't have those anymore, do they) there is one fixated with planetariums. We just enjoy and must work with these things. Kind of like (admit it) you really want to make a devils tower when served mashed potatoes.
Just enjoy it.
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Post by Ron Walker on Jun 13, 2022 14:27:27 GMT -7
Posted by: Ron Walker Oct 30 2017, 01:11 PM QUOTE(Philostopher1 @ Oct 28 2017, 01:08 PM) * Hi Gare (or Gary?)
This is a unique, obscure and eccentric endeavor. Most people don't know what a Planetarium is anymore. I was at the eye doctor yesterday, and talking about me need for glasses for astronomy and my planetarium project. She (the technician) asked, "What's a Planetarium?" ...sigh... She probably thinks astronomy and astrology are the same thing...
So true. So many people question how I can give a show during the day. So far I haven't gotten the question, "How can you grow things without any windows?"
I'd like to get a Sega Homestar. I have a Spitz Jr. I put a Streamlight bulb in. I used to have a GOTO M1. That got lost in a divorce type situation. I feel sick just thinking about it.
The Homestar is a nice projector except for two things (these are based on my very narrow view of the world), 1st: the first magnitude stars are just projected too big (I just can't get past this) and 2nd: it is designed to project on a flat surface. It works OK in a dome but there is something lacking. The Spitz Jr. is surprisingly better even though it is not. Can't imagine the loss of the M1. Not sure if I would have the fortitude to go back and start again. My hat goes off to you.
Video has come a long way. There is a lot of free open source software for edge-blended video and multiple projectors. The resolution, size, cost and technology is now very accessible to the hobbyist. However, to me there is no romance in video. I love the technology but walking into the dome with the machine in the middle is awe-inspiring. There is some art, mystery and other-worldliness to it. Besides optical stars, even with pinholes look better than pixels. That may change.
The local university has put in a "planetarium" which is in reality a flat screen movie theater rip off. They call it a planetarium because it is run by a planetarium computer program which just doesn't cut it for me. I've made some experiments with all dome video which others think is "wow" material. To me it's dim, fuzzy and somewhat disappointing. Nothing $20K wouldn't cure, but those days are gone forever. This I agree will never compete with the optical sky. And yes, the machine in the center of the room. That's what hooked me when I first saw the Adler Zeiss, and I can tell by the smiles when people walk in for the first time that they know they are in for something special
I think I posted this somewhere in these threads but I'll share this again.
In 2008 I went to Manhattan for New Year's with my ex. We saw three Broadway Shows, and Chick Corea at the Bluenote on New Year's Eve. The highlight of the trip for me was to be the Hayden Planetarium as they were supposed to have a Zeiss Universarium projector. As we know this is the finest optical Planetarium projector that money and technology has achieved.
We walk in to take our numbered (!) seats, and my eyes are fixed on the empty floor in the middle of the dome. "Where is the projector!?" We settle into our seats and I notice that the floor has two rectangular panels. I am in denial thinking they will open and the projector will majestically rise into position out of the pit. Then the usher starts going over the rules and pointing out emergency exits. I look over my shoulder at her and she's standing by the door we came in at. Now it's dawned on me that there is no console in the room and I am feeling panicky. She finishes her robotic, dry, uninspired speech, opens a small panel with two large illuminated buttons, one green and one red.
She pushes the green one closes the panel and steps out the door as the cove lights slowly dim. A moment later music swells up and washed out titles of the show appear on the huge dome from a plethora of video projectors. This was hands-down the most dissapointing moment of my life. Seriously.
The prices for tickets to a Broadway show will keep me away forever. Heck, the price for a movie ticket is doing the same thing for me now. No, I'll wait for the BluRay and be able to stop the movie when I need that bathroom break. I can also stop to refresh my beverage of choice or make more popcorn. Your description of the Hayden is indeed tragic but unfortunately so true. The Griffith also has a Zeiss IX and only turns it on for about five minutes of the show but that was some time ago when it first opened. I've heard that they don't use it anymore because of problems with the lamp power supply and it is not worth the trouble to fix it. Hopefully that's just a rumor but I wouldn't doubt it. Progress does not necessarily move us forward.
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Post by Ron Walker on Jun 13, 2022 14:27:52 GMT -7
Posted by: moonmagic Oct 31 2017, 01:16 PM I just read some things that seem to be talking directly to me:
(1) "a unique, obscure and eccentric endeavor"
(2) "Sanity is overrated"
We are all peas of the same pod. mm
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Post by Ron Walker on Jun 13, 2022 14:28:12 GMT -7
Posted by: mrgare5050 Nov 1 2017, 10:11 AM
Building the projector as professionally as possible is the primary goal. It is a test of my skill and organization to express this unusual passion. ---------------------------------------------------------------------------------- It is that indeed, I've never thought of it that way - its a test of many things isn't it. patience too. I remember when I made my cylinder a couple years ago, I challenged myself various things. One was to get all 88 constellations in .. somehow. ------------------------------------------------------------------------------------------------------ People ask me, "Why are you doing this?"
My response is that some people spend their precious hours building intricate model ships. I am building the stars to sail them by. --------------------------------------------------------------------------------------------------------------------------------------------- Thats a beautiful statement, may I use that in my show? --------------------------------------------------------------------------------------------------------------------------------------------- It's a romantic passion of mine that ties into my childhood. My parents donated industrial machinery time to build the OMSI Kendall Planetarium (see pic). From the time I was a baby I had my own chair with my name on the arm rest, second row in on the left side of the console! I spent my weekends there as I grew up. Later I acquired the GOTO M1 "spare". --------------------------------------------------------------- What a legacy! Those are the memories that drive that ship aren't they, steered by the stars. Do you have a picture of the chair? I have this fond memory, one time somehow me and a friend got into the Adler library - I dont think we were supposed to be in there. My soul never left! -------------------------------------------------------------- I had started to build a dome for it in Lewiston California, but we lost our house and property, and all the building materials and construction that had begun. Now I live in a retirement mobile home park on a fixed income. There is just enough room to build a 16-foot dome here. -------------------------------------------------------------- OK - I'm about to join you broke retirement guys, I'm retired end of June next year I'm stuffing my mattress with small bills. Wait - how will you fit a 16 foot dome in a trailer park (in Tennessee we say trailer park) - we are eventually trading our 6 acres here for 1 or less so I need thoughts on how to cram a dome about that size into a small space, with wife approval. ----------------------------------------------------------------------- My plan is to complete a small Planetarium with edge-blended full dome video. There is a need for full-dome content in education and edutainment. My career was in laser light show production and development for these markets as well as corporate and rock and roll. So I hope to have a small business for a bit of extra income from home. That isn't crucial though. ------------------------------------------------------------------------- In addition to the bigger one do you mean? I too would like to make a few bucks. I see now where your tech expertise comes from though ------------------------------------------------------------- The part I am looking forward to is having friends over for shows, and getting back in touch with the amateur astronomy community. I am drooling over the Orion XX12G GoTo Dobson. ------------------------------------------------------------------------------------------------ I'm more of a refractor guy. A 3.2 inch japaneese one from the 70s i tried to make look like a Unitron by adding one of their old finders! ---------------------------------------------------------------------------------------------------------------------------------------------------------- Broadway shows
I have seen many. My favorites are Phantom of The Opera, Les Miserables, and Mary Poppins. Mary Poppins was over the top! -------------------------------------------------------------------------------------------------------------------- did see Phantom a couple times, not in the Crawford/Brightman sense though (original cast). Ron mentioned the cost, we see them a local productions mostly. Ive a soft spot for JC Superstar, my high school soundtrack. Mary Poppins?? Hmmm - at least you didnt say Sound of Music smile.gif ------------------------------------------------------------------------------------------------------------------------------- My hometown planetarium. OMSI moved to a new location with a separate Omnimax theater and digital sky theater. It's all video now... --------------------------------------------------------------------------------
Well Sharon and Ron just published a big high school planetarium figure, ones still out there, I might try to contract some of those. SURELY they arent all digital. yet... shirly?
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Post by Ron Walker on Jun 13, 2022 14:28:35 GMT -7
Posted by: Philostopher1 Nov 25 2017, 06:46 PM Diurnal axis and bearing
Some progress over the Thanksgiving weekend!
I got the bearing portion of the Diurnal Axis done. I still have to put the belt on the hub in the middle. A 15mm G3 timing belt with 360 teeth is almost the same size as 4" abs pipe parts. I have to turn the abs still so I can slip the belt on the center with a bit of silicone for a tight fit.
It's built around 1- 1\2" ABS pipe, and adapter bushings. The adapter bushings fit tightly into 60mm sealed bearings requiring some persuasion with a rubber mallet. I think they are for auto transmissions but they were the right size on Amazon. Obviously the other parts are toilet "closet flanges". These will get slotted holes to adjust up and down on the hubs so the lamp array can be moved up or down in the starball to correct for the hub and yoke separation. The starballs will be mounted here.
I need to make a couple custom slip rings and brush blocks for power and control voltage transmission for, stars, milkyway, constellations, and a couple extra CV channels for aux TBD stuff. These will be mounted just over the bearings on each side.
Next is the hub yoke mount, and the fork mount on the yaw axis. The starballs are delayed due to my carbon fiber lay-up learning curve. And it's cold outside in my little shed\shop.
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Post by Ron Walker on Jun 13, 2022 14:29:04 GMT -7
Posted by: Ron Walker Nov 26 2017, 11:29 AM Beautifully done! PVC is great material to work with. I was looking for the toothed pulley but I guess you haven't put it in yet. I also do not see any 23.5 degree offset and wondering about the procession of the nodes motion.
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Post by Ron Walker on Jun 13, 2022 14:29:23 GMT -7
Posted by: Philostopher1 Nov 26 2017, 03:03 PM QUOTE(Ron Walker @ Nov 26 2017, 11:29 AM) * Beautifully done! PVC is great material to work with. I was looking for the toothed pulley but I guess you haven't put it in yet. I also do not see any 23.5 degree offset and wondering about the procession of the nodes motion.
Thanks! ABS is great stuff. I don't have a lathe and with a little work on a drill press and sandpaper its possible to get a good facsimile of a machined part. CHEAP! The belt is lying there in the pic. The plastic has to be turned to slip and glue the belt down essentially creating a large pulley. The central yoke hasn't been built but the motor, drive belt and tensioner idler pulley will go there.
Yes precession... I am following along the design for the RS Automation Cosmodyssee SN series. Precession was done on the software end. I have no idea how I am going to program that yet. I am thinking that it will be a matter of introducing a sine wave calculation into the stepper controllers. If the drive was completely analog I could do a "digilog" eeprom \dac and hand program the waveforms and control the clock speeds. With Arduino and Rasberry PI options things are much easier... If you know how to code... I do NOT know how to code. Fortunately, there is a mountain of Arduino scripts covering all aspects of motor control for CNC type work. I may have to pay someone to help at that point. Hopefully not, but my brain shorts out looking at code. I've done some basic stuff but...
So at this point, my plan is to incorporate a diurnal, declination and yaw drive with open stepper motor control. With these I should be able to move the sky in any patterns similar to running a cnc with software. Even linear paths. My ambitious goal is to have Stellarium synch up with the projector. For now, one day at a time one piece at a time.
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Post by Ron Walker on Jun 13, 2022 14:29:43 GMT -7
Posted by: Ron Walker Nov 26 2017, 10:48 PM So the timing belt will be glued down with the teeth facing out. Will you run a larger belt around that one or just drive with a smaller metal gear?
Since I hate almost anything computer controlled I will wish you luck. My solution would be to incorporate the 23.5 degrees in the mechanics of the projector. Then just simple motor control. With this drive you must drive the 23.5 degree motor with the diurnal drive. Nothing will work if the computer goes down. But that's just me as all that stuff is beyond me.
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Post by Ron Walker on Jun 13, 2022 14:30:00 GMT -7
Posted by: Philostopher1 Nov 27 2017, 12:40 PM QUOTE(Ron Walker @ Nov 26 2017, 10:48 PM) * So the timing belt will be glued down with the teeth facing out. Will you run a larger belt around that one or just drive with a smaller metal gear?
Since I hate almost anything computer controlled I will wish you luck. My solution would be to incorporate the 23.5 degrees in the mechanics of the projector. Then just simple motor control. With this drive you must drive the 23.5 degree motor with the diurnal drive. Nothing will work if the computer goes down. But that's just me as all that stuff is beyond me.
Yes the belt is turned inside out so the teeth point out for the larger drive belt to mate with. There is a larger belt that wraps around the hub, the drive motor pulley and the tensioner\idler pulley. These will be mounted to the plate supporting the hub.
I hear you with the computer. I am intimidated by this a bit. I am planning a console so there is direct manual control. What fun would this be without that!
As I had mentioned , Arduino and Rasberry PI are two of the most popular microcontrollers out there, powerful, cheap, well supported, massive amounts of code available online. It's just putting it together. Getting that to talk with Stellarium is a whole other challenge. However Stellarium does control ASCOM telescope mounts, and it may be possible to adapt the Alt \Azimuth code people are controlling Dobsonians with.
The nice thing about the Arduino R-PI micro controllers is that the code is permanently stored in the microprocessor because its basically eeprom based. So there is a lot of stability and reliability inherent. No windows is required until Stellarium gets involved. Stellarium does work with Linux but I think Ill (grudgingly) stick with windows.
Todays a sunny day. I am going to try to get the wood cut for the base.
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Post by Ron Walker on Jun 13, 2022 14:30:21 GMT -7
Posted by: moonmagic Nov 28 2017, 08:09 AM Just so you know others are still following along and find it all very interesting. 99.9% is above my head, but none the less I am so impressed with the level of workmanship. I'm glad Ron is able to grasp all of this. I think Ron can make anything work! mm
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Post by Ron Walker on Jun 13, 2022 14:31:26 GMT -7
Posted by: Philostopher1 Feb 10 2018, 07:30 PM Project update February 10 2018 SW Oregon has had unusually nice weather this last week which has made it pleasant to work outside in my little tin shed-shop. During the prior weeks while fighting with Seasonal Depression, I managed to settle a few things. First, is after months of research and deliberation my light source is a single cree xq-e hi led through a MIAO Lab super fisheye lens per starball\hemisphere. I believe it is the best source for point size intensity and color balance. So that has prompted the development of an occultation system which I wasn't planning other than the projector stand area. I attached a picture of the "eyelids" below. There are two per lamp. The eyelids roll over one another so when the projector is pointing up a single 1/4 sphere folds back below the lamp\lens. As the projector rotates the cups will move out and form a complete hemispherical cup when the projector is pointing down etc. I'll post the mechanics once their done. These are made from Cinefoil that was formed in a plastic 3" "bath ball" ornament thing. The next pictures are the fork. It's not done either but I am making good progress. Considering, most of the pieces were cut with a saber saw it's turning out ok. I'll fix visual Aesthetics later with ABS slurry and paint. Finally, for this update, I have decided to just drill the aluminum hemispheres I have. I tried multiple times to produce a carbon fiber hemisphere and it just becomes a frustrating mess. There is a real art to carbon fiber. It needs to be pre impregnated and vacuum formed to get the beautiful quality. I don't have the set-up or experience to pull it off. I had an "A-ha!" moment regarding drilling stars for fun, efficiency and accuracy. Maybe, I read something like this here many years ago and it percolated up through the noise in my consciousness. First, there is a celestial sphere available here that can be made into a paper model. It was spherically mapped based on Hipparcos (I think). Anyway, you can select the magnitude you want up to sixth. Labels, gore numbers etc. here: www.suopte.com/en/apps/stellasphaera.phpI am going to approach it this way. 1. Download the Stellaspaera pdf. I am going with 6th magnitude, 36 longitudinal sections with 18 latitude. This is the highest resolution offered. These get imported into photoshop, scaled for my hemisphere and then reversed. The sections will then get wallpapered to the outside of my hemispheres. Now I have a drilling template. 2. The same process is done again for the inside of the hemispheres with non reversed charts. The charts are then laid over cinefoil and tacked down with repositionable adhesive (3M Super 75). Now the foil can be punched through with a needle or drilled holding a pin vise with the tiny drill bits. 3. The hemispheres will have some orientation markers scribed into the aluminum inside and out so that the outside and inside are geometrically aligned. Now one section of the cinefoil pinholes can be aligned and affixed inside the hemispheres thereby properly aligning through the larger holes outside. I have been discussing this quite a bit (no pun). I want to get away from dealing with drilling #80-ish holes through 1\8" hemispheres. Been there and done that and it was very frustrating. Rather the smallest holes will be 2mm through the aluminum. In the situations where there are a few very close stars there will simply be a larger hole with the cinefoil pinholes behind it. In most cases, particularly for 1mm pin holes there will be a small standoff tube pressed into that hole, acting as a stub for lenses. This will continue down through 4th magnitude wherein a "bugel bead" will be pressed and affixed in place. I want to have the freedom to install lenses on lower magnitude stars. I am looking into optical injection molding companies that can make a 3mmx 250mm fl lens. I'll leave it here for now. Here are the eyelids. They still need to be painted flat black and mounted etc. Here is the fork with a view of the inside structure. This is ABS sheet and 3.5" pipe. Quite light and sturdy. Here is the fork after more assembly. Still needs cracks filled and paint. The open areas are for the latitude axis. I am waiting for parts before I commit further on this.
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