So the mount is the issue, have you thought of a pier type mount with an angle fork? Goals for the project: 1. In larger sizes the price can go up, for two reasons. I'm happy to read that my texts, pictures and videos are useful. Sky-Watcher Classic 250P DOBSONIAN Telescopes The Ultimate Light Gatherer The Dobsonian telescopes are named after John Dobson, an amateur astronomer who designed a very simple but effective telescope, where the key factor is a large aperture for . as well as Alt-Az mounts (including Dobsonians, and the like.) Arduino mega with motor drivers to drive the telescope, I have an arduino uno and a motor driverfrom anotherproject so I can reuse them if uno is able to handle these computations. I don't know if there is any benefit of usage the 400 steps motor. Don't change the idea, stay with the stepper motors. I just picked few examples from ebay for stepper motors, that's why you don't see the model you have in that list. Stepper motors and pulleys will give me 200 steps per revolution + 100:1 inbuilt gear ratio + 8:1 gear ratio with pulleys + micro stepping (this part I'm not sure how it works as I never dealt with stepper motors). In the so-called "good old days" if you built your own telescope, you generally made an equatorial mount to go with it. And presently I have much more IO in GPIO. Was $1,599.99 Now You can calculate exit pupil in one of two ways: or should I forget about steppers and go with a DC motor and a separate encorder? If you want to build a 6" that looks like those bigger scopes, you can. Of course you could design a foldable mount but I would prefer to avoid that. 7. At no extra cost to yourself I receive a small commission. There are multiple stepper motors available on the market which I'm not sure which one will be best for me, Nema 17 1.8deg 200steps Bipolar 1A 13Ncm. Here is the very heavy mount for my 6" dob in the second photo, it does not break down into smaller pieces easily. Custom software so I can integrate a field derotator in . You could drill holes in the tube like in this photo and put mount studs in it or use the existing mounts on your tube and make a fork they rest in on the pier. I assume I will need another one for the finders scope as well. But I can't advise in terms of Skywatcher Alt axis, I have Bresser Messier (Explore Scientific), so the idea is different. As you said if the gearbox has backlash then whole thing fails. They can be controlled via computer as well (making or buying a cable & usb adapter). This is all to get a balance point near the mirror as opposed to the middle of the tube. 3. My stepper motor work in 8 micro steps mode. I have a feature allowing to change the mode to full step, but then the set generates terrible noise, especially in Alt axis. 2 Minute Guide to Building a Dobsonian Mount - YouTube 0:00 / 2:18 2 Minute Guide to Building a Dobsonian Mount 9,658 views Apr 2, 2020 If you would like to help support the channel you. I helped a friend build a 6" solar Dobsonian. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. Regarding the stepper motor with gearbox included - just be careful, I found out over one year ago that they can have backlash in every single gear, so they will add themselves together giving possibly significant error. Most Dobsonians are manual, but not these GoTo Dobsonian Telescopes! or should I forget about steppers and go with a DC motor and a separate encorder? We have placed cookies on your device to help make this website better. A computerized Dobsonian finds celestial objects for you! Remember that the tracking of your Goto mount should be off. This combination gives a resolution of around 24 ticks per arc second when reading 4x via the encoder IC.This is plenty for provide tracking GOTO and tracking accuracy. Also included is a 1.25 Star diagonal for easy viewing. But don't worry, I just work on 8 micro steps mode and equation of ramp for first and last 1500 steps of the slew. The reason for the slip I found out was because of the weight of the OTA (sags down/ bends downward) causing friction (gets stuck) when I move down in altitude. The smaller it is, the dimmer the view. Small garden , not enough open south sky are the major ones so now I'm thinking to motorize my Skywatcher 200p dobsonian to have GOTO and tracking. Nema 17 1.8deg 200steps Bipolar 1A 13Ncm. Put a taller strip of wood either side and fill the gap with hot glue. Build a mount with 18mm plywood or MDF. $2,049.00 Qty Add to Cart Add to Compare Details SkyWatcher 12" Dobsonian GoTo Upgrade Kit turns your basic Dobsonian mount into a GoTo capable one. You can place your dobsonian mount over it. Please re-enable javascript to access full functionality. Definitely use plywood instead of MDF. The Dob is simpler to build.that's one reason why it's so popular. Several functions may not work. When tracking the sky, the motors turn at 12rpm. 10" and 12" solid tube scope still cost less than $1000. This is all to get a balance point near the mirror as opposed to the middle of the tube. Here is a 6" f/7 with a Dob mount. Use a strip of modelling clay and the output gear to create a profile for the rack. Finally the noise is acceptable, but 1/4 full slew in Az axis takes 50 seconds. Sky-Watcher Dobsonian Upgrade Kits for GOTO upgrades your Standard Dobsonian to Full GoTo and Tracking Mount. So that's the whole idea I have in my mind which I have been thinking for last couple years ever since I bought the telescope. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Presently I have two worm gears, Az is 896:1 and Alt is 897:1 and no other gears. OnStep was designed, from the beginning, as a more or less general purpose system and provisions were made in the firmware to . I started with a prototype but quickly realised that I won't be able to fit it into my small car. For on board computing to connect with webcams and controllingI can use a RPi or a smallPCwith stellarium. Large scopes have heavy mirrors so the balance point in low. A 6 inch mirror is not heavy and the balance point is near the center of the tube. if it's the first one I will have to rethink as I don;t want to disturb my neighbours middle of the night. (Alan Dyer) BUT, you'll have to make the front as light as possible (consider single ring, no finder scope, simple focuser etc), and you may need to add some weight or use springs at the back. I had also only 139,000 (micro)steps per revolution. 3. This is an image of the first mount for my 6" f/5, a 10 lb (or 4.5 kg) scope. The equatorial is more complicated, but still not out of the question even for those with just basic tools. DIY GOTO Dobsonian - posted in ATM, Optics and DIY Forum: Hi, https://www.reddit.c.utm_name=iossmf I tried adding a goto to my Dobsonian (Bresser Messier 6 Tabletop Dobsonian) Using OnStep I have been successful in moving the telescope in the azimuth axis without problems In the altitude axis it's successful too but only in one direction When moving up it's fine When moving down the GT2 . Thanks very much for detailed post Vroobel. I read about some Linux software allowing to take and sent pictures from any USB camera with setting up parameters of exposure. Since they are so precise in keeping celestial objects in the centre of the eyepiece, these self . One supplier of premium Dobsonians sells a 12.5-inch model with add-on computerized GoTo for upwards of $6,000. The sample we will build is a 6-inch f/7.5, however the plans can be scaled down to 4-inch scopes and up to 10- or 12-inch scopes of various focal ratios. I'm a little bit surprised, because I have Nema 17 1.8deg 65Ncm, which is none of listed above. Mounts + Drives + GoTo; Power Supplies + Tanks; Cameras. We built the mount from window cutouts from schoolhouse doors that had been thrown away." At age 91, Dobson is as passionate about building inexpensive telescopes as he was when he built his. You'll need to manually move the telescope to keep the object in the field of view. . The two axes perpendicular to each other are . EAA with dobsonians - GOTO or EQ platform? Share on Twitter the base is also the box for the scope, the eyepieces and finder. I was talking about the mount not fitting the car, not the tube. I use the Excel and its chart to see a ahape of the chart, then move the equation to Python script. These light weight, compact, medium payload titans will deliver an astronomy experience like never before. Equally capable for visual and imaging pursuits, the LX85 is a robust yet portable mount for all your astronomy needs. 1. OnStep is a computerized telescope goto controller, based on Teensy or Arduino control of stepper motors. Download the Manual CONTACT US TASCO SALES (AUST) PTY LTD The Az axis is not so noisy. This automatic tracking telescope comes fully equipped with two AFOV eyepieces, a 23mm wide-field 60, and a 10mm wide-field 60. Login To My Account ; Create An . The designs are all freely available and a community of helpful makers has sprung up around it. If you would like to help support the channel you can buy me a coffee here: https://www.buymeacoffee.com/DIYAstro?new=Affiliate links for First Light Optics below. If you just like to tinker-> You can sometimes get the Celestron Nexstar SLT or Skywacher Az Synscan mounts relatively cheap. The mirror end sits on the floor and the tube is angled up toward the roof. Otherwise, you possibly will use small looped belt. 1-16 of 159 results for "dobsonian mount" RESULTS SkyWatcher S11800 GoTo Collapsible Dobsonian 8-Inch (White) 31 Save 8% $1,33400 $1,450.00 Lowest price in 30 days FREE delivery Mon, Nov 21 Only 5 left in stock - order soon. They are certainly not a replacement for dobsonian mounts, particularly on larger longer heavier scopes. These motors are a marvel of technology and can rotate extremely slowly under Arduino control with zero magnetic cogging. Today the Dobsonian mounting prevails. See more ideas about telescope, amateur astronomy, telescopes. Sure, pipe mounts are a compromise, just as all gear is. 5. Because the basic movement and optics requirements are relatively simple, much of the design is left to the builder. Both of these are shared just as examples of what can be done, as possible alternatives to dobsonian rocker box based mounts. I have a question regarding stepper motors, I'm sketching a gear system to achieve 2880:1 gear ratio before the stepper motor, which will be archived with three sets of pulley systems which has gear ratios of45*8*8. The included hand controller contains a huge database of locations which your upgraded telescope can automatically point to. Use a lazy susan bearing for AZ axis and use flange bearings for Alt axis. Download Size: 2.1M | 21-02-2018 | SynScan GOTO Mount SynScan-GOTO Upgrade kit for Dobsonian Telesope For mounting a DOB Traditional, DOB Collapsible, or Newtonian Reflector telescope tube OTA on a SynScan DOB GoTo Upgrade Kit. Once this has cooled, you can wash out the clay to reveal a plastic rack. It can be done. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. 6 inch is relatively lightweight so I think it would work? Asterion Ecliptica Light Tracking Platform for Dobsonian Telescopes Ecliptica Light 50. You get access to automatic tracking and slewing. Lomography LomoMod No1 DIY 120 Camera Kit I push the passenger seat back, and use the seat belt to secure the tube. Regarding the large worm gear , I would struggle to do your way because I don't have proper equipment, but I guess I have to rethink about gear combinations to get the gear ratio I want. I'd like to reach a speed around 60 seconds for full resolution, but it is a choice between the speed and the noise. The plywood Dobsonian mount is simple to build and very functional. I'm not familiar with stepper motors and how to choose the right one for this project . The bigger it is, the brighter the view. I got a router, jigsaw , mitre saw and a table saw at home, plus I'm fairly competent with them so this part shouldn't be much of a problem. The kits range from 6 inches to 12 inch Dobsonian telescopes and will cost you between $300-600. do these have different max speeds? That's the basic motorized mount I have in mind. Jim09, It is an Newtonian optical tube, mounted on a very simple, yet very stable and easy to use alt azimuth mount. That's why I reconstructed my drives. What is an Dobsonian? The pipe is 1 1/4" and threaded from the round base board, so into 2 pcs to store behind the seat in my vehicle.

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