![Alex M](/img/default-banner.jpg)
- Видео 69
- Просмотров 170 380
Alex M
США
Добавлен 24 май 2012
WLED Refractor Collimator
just sharing some ideas inspired by others on refractor collimation. using programmable LED ring provides nice flexibility in brightness and color control
Просмотров: 414
Видео
Moon view in Criterion Dynamax 8 and SvBony SV305
Просмотров 2012 месяца назад
Did a full refurbish of the scope and recollimation Not too bad for a 40 y.o. boy. SV305 was inserted directly into a scope (no prisms, barlows, etc) It shakes when I was trying to focus an image.
Heat-Molding Burton Intuition 3 liners with SMD Hot Air Rework station
Просмотров 389 месяцев назад
Heat-Molding Burton Intuition 3 liners with SMD Hot Air Rework station
Walksnail VRX with 2x iFlight Albatross 150 mm and Nano VTX
Просмотров 119Год назад
First field test of Walksnail VRX with my HDO2s. This is VRX recording at a sunset/dusk time. So some expose drops are pretty harsh. I also got iFlight Albatross 150mm, I can confirm their reception is better than original Walksnail stubbies. Improvement was especially noticeable when the drone was circling behind my head. Overall VRX VTX combo is a good-performing bargain until I will get a de...
Belize, Half Moon Caye
Просмотров 154Год назад
This is by far one of the best dive I ever had among 70-ish on my log. Uncut and unprocessed clip from GoPro 11. Yet to put all vids together from this one.
When a dive shop has a shark for a pet...
Просмотров 121Год назад
Diving with Ramon's shop at San Pedro, Belize. Awesome experience, first day of diving and looks like every dive is a shark-dive here. This beautiful creature has found our group through the middle of the dive and kept swimming with us almost till the end. And after witnessing this - now I know why! It got super excited after smelling the Lionfish blood, but had a hard time finding it right away.
OnStep Dob First Light - Jupiter Oct 16 2022 (~ 5:00 AM UTC)
Просмотров 615Год назад
First time testing DIY GOTO system with OnStep controler on my 10" Dobsonian. With a friction wheel AZ drive its not too precise. I did not spend much time aligning the mount and tuned friction drive just to enough to hit a target within ~1 degree after ~180 deg rotation. As you see there is a little drift I had to correct few times through the duration of the footage. Equipment: - Orion Skylin...
Testing DIY Ronchi Eyepiece on Polaris (360 LPI)
Просмотров 566Год назад
Earlier I made a Ronchi Eyepiece which was 3D-printed on MSLA using a linear encoder strip from InkJet printer. I am quite surprised that it does the job. How it was made: ruclips.net/video/I9_5RCylSCM/видео.html
OnStep your Dobsonian with Zero Woodworking - Part 3
Просмотров 3,8 тыс.Год назад
Testing the Drives This is for GSO 10" Dobsonians with premium Altitude bearing tension adjustment mechanism Apretura AD10, Zhummel Z10, Orion SkyLine 10" Fitting to other diameters of the same lineup (8" and 12" mirrors) will require a different belt length and a minor modification of the motor clamp block. Thingiverse: www.thingiverse.com/thing:5531109 OnShape CAD: cad.onshape.com/documents/f...
OnStep your Dobsonian with Zero Woodworking - Part 1
Просмотров 4,3 тыс.Год назад
Parts and Assembly This is for GSO 10" Dobsonians with premium Altitude bearing tension adjustment mechanism Apretura AD10, Zhummel Z10, Orion SkyLine 10" Fitting to other diameters of the same lineup (8" and 12" mirrors) will require a different belt length and a minor modification of the motor clamp block. Thingiverse: www.thingiverse.com/thing:5531109 OnShape CAD: cad.onshape.com/documents/f...
OnStep your Dobsonian with Zero Woodworking - Part 2
Просмотров 3,5 тыс.Год назад
Installation on Scope This is for GSO 10" Dobsonians with premium Altitude bearing tension adjustment mechanism Apretura AD10, Zhummel Z10, Orion SkyLine 10" Fitting to other diameters of the same lineup (8" and 12" mirrors) will require a different belt length and a minor modification of the motor clamp block. Thingiverse: www.thingiverse.com/thing:5531109 OnShape CAD: cad.onshape.com/document...
6" Diatone Tyrant, BF 4.3 preset tune
Просмотров 36Год назад
I've just selected a tune for 6..7" quads and did nothing else, amazing!
Review of 90T worm drive kit from Ali Express
Просмотров 379Год назад
Replacing belt drive of axels on my DIY OnStep mount with cheap worms from China
DIY Cheap Ronchi Eyepiece
Просмотров 721Год назад
Using an encoder strip from an Inkjet printer ($15 of eBay) and any 3D printer you can make hundreds of these. Testing on Polar star: ruclips.net/video/2IsVEftQgTY/видео.html
Diving in Barbados with Seahorse Divers
Просмотров 2152 года назад
Diving in Barbados with Seahorse Divers
(Not so) few words on practical MSLA prints
Просмотров 292 года назад
(Not so) few words on practical MSLA prints
Go-Kart OnStep - DIY equatorial mount for up to 12" telescopes.
Просмотров 28 тыс.3 года назад
Go-Kart OnStep - DIY equatorial mount for up to 12" telescopes.
BNO085 and 2x ICM-20948 Self-Calibration from Cold Start.
Просмотров 12 тыс.3 года назад
BNO085 and 2x ICM-20948 Self-Calibration from Cold Start.
BNO085 MotionEngine vs ICM-20948 DMP Comparison - Part 1
Просмотров 14 тыс.3 года назад
BNO085 MotionEngine vs ICM-20948 DMP Comparison - Part 1
Foucault Test - Hot Air Visualization
Просмотров 4024 года назад
Foucault Test - Hot Air Visualization
Jupiter in Meade MTS-SN6 (6" Schmidt-Newton), Pentax K5 + 2.5x Barlow
Просмотров 3014 года назад
Jupiter in Meade MTS-SN6 (6" Schmidt-Newton), Pentax K5 2.5x Barlow
Saturn in Orion XT8 (8" Dobson), Pentax K5 + Barlow 2.5x
Просмотров 1094 года назад
Saturn in Orion XT8 (8" Dobson), Pentax K5 Barlow 2.5x
Jupiter in Orion XT8 (8" Dobson), Pentax K5 + Barlow 2.5x
Просмотров 824 года назад
Jupiter in Orion XT8 (8" Dobson), Pentax K5 Barlow 2.5x
Saturn in Meade MTS-SN6 (6" Schmidt-Newton), Pentax K5 + 2.5x Barlow
Просмотров 6474 года назад
Saturn in Meade MTS-SN6 (6" Schmidt-Newton), Pentax K5 2.5x Barlow
Moon in Orion XT8 (8" Dobson), Pentax K5 + 2.5x Barlow
Просмотров 1354 года назад
Moon in Orion XT8 (8" Dobson), Pentax K5 2.5x Barlow
Hey alex, great demonstarion thankou. Have both bno 055 and 20984 but cant run dmp on 20984. Which library have you used? Cheers
20948 tdk I mean. The documentation is awful. The dmp on 6050 was awesome so I had high hopes for dmp3
Hi what is the total ratio use for alt and az?
Pls give more information about algorithm. Code or another things.
Where it's oossible to download all info? Thanks
Nice bro, you could get some videos to stack for high resolution pics. :)
What's exactly the difference between onstop goto and servocat?
Hi, Alex. Really good idea! Do you have the 3d printer file to share?
Have you used ur own software module to control sensor? Have you managed to collect data from all 3 sensors with the same data rate?
Nice picture how about a little technical information eyepiece mm, size of the scope dia, Any additional filters for contrast, Or for atmospheric conditions.
Added to the description. Random visitor of my channel might be out of context - this video is less about image quality and more about the accuracy of tracking of the DIY GOTO system I've put on my Dob (I've posted a series of videos on how to do that)
what is the focuser mechanism?
Hi, are you able to help me with OnStep configuration? I need to know the GR1 and GR2 values in the OnStep configuration spreadsheet
Hi, did you have any luck with the configuration spreadsheet?
@@PeterTakac I did but I amended the design quite a bit... I used the same size belt for the alt, but the az I went a different approach and used a slightly smaller MDF disc with a belt around it ..
Hi Thank you for this post and your files on Thingverse. Really appreciate the time you have put into this. What gear do you use on each motor? What pulley belts did you use? My Nema 17 motors didn't come with any, and I'm not sure what to match with the gears we printed from your files. I am building this with my 12 year old son, and have it mostly assembled and are about to start soldering the onstep control board.
Hi, how did you get the nuts inside the side bearing carriers?
the nuts can be sourced on on e-bay by searching for "M6x10x10 nut" www.ebay.com/itm/185952833397 to get the nuts inside you have to unscrew the bearing assembly from inside the tube using Philips screwdriver. I recommend to remove main mirror cell. This way you get the shortest and unobstructed access to the screws. Keep your scope horizontally not to accidentally drop any screws onto secondary mirror.
Amazing ❤❤❤
wow. I watched your videos. Very neat design🎉
Nice work! I just found this video. Thanks for the recognition! Watching your video gives me some really good ideas and inspires me to improve my design. I think I will work on some changes and try to get some new videos and designs uploaded. Thanks again!
Thanks man. Your friction drive idea made implementation of this project very easy. However for these who travel with their tube often it It has a major disadvantage - after re-assembly of the scope the friction drive ratio changes slightly (variability of pressure in compliant mechanism and its positioning) I have to fine tune for more accurate tracking in OnStep app. But I usually don't bother, I seems found a perfect ratio where the object stays in the FOV for about 2 min. Which is good enough for visual. Dobs are not used for DSO astro-photo anyway and 2 min is good enough for planetary photography
Hi, what's the diameter of the pulley that fits to the scope?
Hello Alex, can you share the code for the ICM-20948 to load the DMP Firmware from your STM32 to the ICM-20948 and read the IMU Data from the ICM-20948 DMP?
Excellent job, thanks for sharing.
Thats awesome
I really like this set up. I conceived this in my head and googled and hey there it is! I am considering a ten watt laser engraver, and the z axis is important to me, so I was looking at the Neje 4, but that’s 1k, and I have some extruded aluminum and boards with stepper controller, so I’m thinking of putting some into a 20w laser module instead. The only way I can think to improve this is to put a galvo laser swaying rapidly upon any axis. I modified the software on my tarantula a long time ago. I’ll look at the old projects and where they went. Do you have any advice to give in this? Thanks for your videos. I have a 3D “galvo” printer. It’s the D2 Photon and it really turned me on to the idea of galvo based lasers. :fistbump:
DLP (D2 Photon) is not "galvo". When somebody talks about "galvo" in the optical scanning system it is usually one ray (or line of rays) delectated on varying angle in a scanning pattern with a brushless motor. DLP is an array of tiny mirrors flipped in a binary way (just two discrete angles - on/off). Don't waste your time on any "galvo" ideas in DIY project. Specifically complex part is a change of focal distance through working area - a ray deflected by galvo-mirror in to the center of your working area will have a shorter travel path than a ray deflected onto the edge of working area. Thus any galvo system should also adopt automatic focus adjustment based on deflection angle. Alternatively you may forget about Z and just mount a laser on long distance form working area (e.g. 3x longer than the size of working area). This way gaussian beam of the laser will have much longer depth of focus, making "defocusing" error negligible through the whole working area. The larger the ratio - the more negligible the error. But it is still there, so quality of cut on the edge is not the same as in the center. Almost all desktop galvo engravers are usually using this principle - their working area is much smaller then the height of the device. And the taller models are performing better. None of them accommodates automatic focus adjustment because its very complex to do at high speeds.
@@alexm7056 okay. I was aware they called it a DMD array for the photon because it is a series of mirrors pivoting rapidly to make the lines. It would more aptly be called hundreds of galvos then? Because as far as I'm aware a galvo is axis controlled mirrors reflecting light and that's what a DMD is but hundreds of them. You are probably right when it comes to jargon, but boiling it down to understanding for building I think I am more correct. Correct me if I'm wrong though. I found jargon nigh blasphemous. Keep it simply stupid.
Hello Alex, Very clever! Can you give the reference of the encoder strip or the link on ebay?
Just open eBay and search for "300 LPI ink jet encoder strip". I've also printed few more of these few weeks ago but did not have time to post it on eBay.
I'm going to do the same thing with my AD12 and wanted to know if you can do a video covering the software setup? Good video thanks.
ruclips.net/video/2oASeJlPFI0/видео.html
Bonjour je voudrai faire la même chose sur mon dobson skywatcher 254 /1200 peux t on utiliser une carte fysetc s6 pour le faire merci
@@louloulouloy4978 Sure it will work. Controller type/model does not matter much. The hardest part is to do mechanics right. Your telescope has a bit different design of an altitude bearing. So the timing wheel design will not be as easy.
What software were you using to control it?
What wavelength is that?
Warning label says 400~460, I don't have a spectrometer to measure exact value. Its a typical blue laser of eBay. Not an extreme UV
Hello, can you recommend some cheaper alternative to the stepper motors you used?
frankly - there is no alternative, it is not about a motor - these are pretty com m on NEMA17 steppers you can find as low as $10 a piece of eBay used in decent codition. It is about the gearbox they come with - it is high precision gearbox with a very small backlash. It may work with cheaper gearboxes, you may have to play around with backlash config settings in OnStep onstep.groups.io/g/main/wiki/20943 You need any NEMA17 stepper with gearbox with at least 1:50 ratio
Did you use this gears in your mount?
Did not have time to get to it yet. Sometimes work takes priority of home pet projects. THey will do the job for visual for sure. Its just not a great enough quality and to large pitch for astrophoto.
Hello, this is amazing! Would this exactly fit my 12" collapsible sky watcher dobsonian?
Unfortunately the answer is "No, it won't". The advantage of the dob I have is a nice thrust bearing design of altitude bearings in CNC body. Which allows to fit this large timing belt wheel on it very nicely and very centered without drilling any holes in the telescope tube. It is however possible to design something for your specific scope model, but installation of these mechanisms won't be as easy.
Hello. can i adapt this kit to my 12" dobson telescope? (Levenhuk RA 300N)
Yes, absolutely. Its essentially the same scope, just slightly larger size. Two things to take care of: 1. the belt length you need. 2. modify the geometry of the motor mount. Because the geometry of 10" mount base is slightly different (distance and angle from vertical wall to the circumference of the base). As for that large timing wheel (altitude) - you can just print out my design, it must fit.
@@alexm7056 thanks sir but the stepper motor link is invalid. Where can I get these same engines?
@@khattab9612 www.omc-stepperonline.com/nema-17-stepper-motor-l-39mm-gear-ratio-100-1-high-precision-planetary-gearbox-17hs15-1684s-hg100
@@alexm7056 thanks. Where can I find an onstep motor controller?
@@khattab9612 you have to make it yourself. The cheapest way is WeMos R2 + CNC shield (which I actually use in this project) onstep.groups.io/g/main/wiki/19670 You do need to have certain "Arduino-level" skills to make it work. Instructiions may looks way to technical for the newbies, but don't hesitate to ask a question in group discussion.
😂 nice flying👍 youtube.com/@danielharmen6639
Astrophotography ?
Oh, My, Word! I have never seen a Ronchi eyepiece. I have been wanting to test my 10" dob mirror for a long time and this seems so much easier than other methods. Please keep you excellent content comming. P.S. I loved the simple angle mount that holds both motors for the alt-azimuth dobsonian tracking setup. Very simple and clever. Thank you.
Have you been able to take pictures of dsos with this onstep setup? in the configuration file how do you specify declination 0 degrees (horizontal) and 90 degrees (vertical) for a dobsonian? I have it at -90 to 90 degrees for declination but I want the dob to stop at 90.
This friction drive cannot be tuned precisely enough to do long exposure DSO. My main goal of this "invention" was a quick disassembly and set-up to use my dob as a travel scope.. Every time I mount the drive module the friction radius is slightly different. So drift varies and needs adjustment, but it's good enough for visual so I don't bother with readjusting. The solution to this would be gluing a GT2 belt around the base. So you would have a fixed tooth count. Here is the example: ruclips.net/video/vPDEvH8jAW0/видео.html
Is this stand as good as an EQ5?
Nope, any plastic will have a lot more flex than metal
Is the 8825 good enough? What about TMC drivers?
onstep.groups.io/g/main/wiki/4464
funny test! lol
Are actual CAD files (DFX, DWG, IGES, etc.) available? Very nice but can't figure out the On Shape thing.
cad.onshape.com/help/Content/exporting-files.htm
How do you apply calibrated offset and scale? I mean where can I find that values? I can not find any information about it.
IMU device calibrates itself all the time. On Invensense you have to read these settings when you consider the device have been rotated enough in all directions and save them into flash memory. Then load them into IMU on next startup. On Invensense driver these are inv_icm20948_get_bias and inv_icm20948_set_bias functions. BNO device has its own non-volatile memory, so you can call sh2_saveDcdNow function to make it remember the settings (it will re-apply them on power-cycle) and sh2_clearDcdAndReset to clean them up (when you want to re-calibrate the device from its factory settings).
@@alexm7056 мой вопрос возник откуда, на BNO055 после калибрации нужно было гдето сохронять offset данные в ручную и потом применять их(все в ручную). А тут тоесть просто делаю ДИНАМИЧЕСКУЮ(А НЕ СТАТИЧЕСКУЮ) КАЛИБРАЦИЮ, сохроняю его с помощью той функции и все? Второй вопрос: сенсор считаеться откалиброванным когда AQURRACY LEVEL = 3 да? допустим в случае кода нужен только rotation vector(quaternions). И третий вопрос: тут нету статической калибрации да? Спасибо.
@@emmetray9703К сожелению на все эти вопросы я ответов ужене знаю, этим проектом уже давно не занимался и много чего подзабыл. В моем коде статической калибровкой (если там и есть такая) не пользовался. "Динамическая" скорее всего иммется ввиду что фюжен-фильтр сам себя каллибрирует когда видит разницу в показателях от разных сенсоров в рантайме (например по гироскопу видим поворот на 90 градусов, а по компасу на 45, значит компас сбит). Насчет того насколько сам модуль уверен в калибровке - я бы этому параметру не доверял. Даже перемещение модуля между включениями в другю комнату может сбить калибровку компаса, так как рябом может изменится кол-во металическиг предметов (напрмер жестяная плита на кухне или стол с метлическими ножками может повлять на показатели если все очень близко).Жалетельно процедуру калибровки встроить в интерфейс прибора по месту его использования.
@@alexm7056 вы можете показать исходники вашего кода?
like balancing a steadicam
How many steps of a stepper motor do you have per arc second? I think it's too small for photography.
Gear box is 1:100, belt drive is 1:9. With a motor of 200 steps/turn and a driver with 32x micro-stepping it results into 16000 micro-steps per degree, or roughly 4 micro-steps per arc second.
Hahaha. That was a funny moment. It was nice meeting y’all. -Andre
Wow sir, thank you for your video.its nicely build and perfectly fit and work good
How much is the cost of all tools used for making this mount ? Thanx
Around how much does it cost to build?
~$350, most of the cost is take by geared steppers and hardware, around $100 for 3D printing plastic. At this cost it is more reasonable to look for mildly used CG5 AS GT.
@@alexm7056 thanks for that feed back!
Интересно! А купить такую систему можно?
Я выложил линки на детали в Thigiverse. Если нет 3D принтера - то можно заказать пластиковые детали онлайн за небольшую сумму - остальные компоненты можно заказать с AliExpress.
@@alexm7056 Благодарю!
hello sir make it small disk.
small disk is a disadvantage, you need a leverage of large radius to pull the tube by a small motor with a good precision also is minimum transfer ratio which comes into play with OnStep
Thoroughly brilliant with the o rings on the az! Love it! My gso with onstep has gears and an elastic band for tension fitted to a linear rail
The unwrapping noise is louder than your voice. Please speak into the microphone.
Hi! How big is your telescope? (150mm? 8"?)
It is 8" (200 mm) Ritchey Cretien (Malincam VRC8, the same as AT8RC). Almost 10 kg with diagonal and large eypiece.
Nice, I have similar plan for DIY EQ mount
Hi! Have you tried using it for astrophotography? And How could I improve your design for it to be more accurate?(better motors...)
I did one planetary visual observation only. Tracking is OK, but I did not measure it with PHD2 just yet. It will not do well for long-exposure astro-photo The main reason are direct belt connection to the axles. Belt is stretchy, tension will not help here. So for wind it wiggles like a spring. Recommendation is to replace belt drive with worm-gear: www.aliexpress.com/item/3256803968510991.html Again - as per my calculations a better investment of money would be to acquire a used CG5 or AVX for around $300...$400. This was "just for fun" experiment which is only applicable for visual and short-exposure astro-photography (under 60 sec).
@@alexm7056 So, I got funding from a local company to build this, as it would be my final project in HS. If I replace the nylon with carbon fibre filament and upgrade the belt to worm drive and add guiding do you think I could do some real astrophotography with an 8” 11kg telescope? Im aiming for 30-60 second exposures.
@@MatijaSircelj during calm weather (no wind) this mount will handle 60 second exposure with no issues. Even without warm drive. I am just learning how to use PHD2, waiting for clear skies to test out RMS.
@@alexm7056 You see the problem is that I'm making this mount out of aluminum and the belt probably wont be enough. Or perhaps it will?
@@MatijaSircelj belt will pull it, but - with a problem of wind. Belt is springy - like a rubber. So with a wind gust a telescope starts to wiggle. Some may say that the belt tensioner will solve the problem - but NOT! Over-tensioning the belt makes it worse. It is possible to increase the tension of the belt by putting shims of thin plastic or sheet metal between the motor mounting bracket and axle block (which is 3D printed in my case). High belt tension puts too much load on the axle bearings and motor gearbox bearings. The tracking becomes "jerky" or "sticky". It becomes impossible to use the mount even for visual use. Axle rotation vibrates like it has Alzheimer's . I will post a video of this later. So you cannot overtighten the belts to solve a wind problem and improve positional accuracy. With normal tension - mount works in a calm weather and tracks smoothly. But positioning accuracy is affected by balancing of your setup. E.g. swapping to a heavier eyepiece starts stretching the belt due to off balance, and your target on a sky shifts slightly. I recommend you to redesign the axle drive to worm gear.