Plus, it is eminently compact and transportable. The EQT-150SC comes with a drive friction release lever for easy resetting. Inverting the speed gives the useful quantity. OpenStructures performing at the Cirque royale! These are the position of my telescope feet. Crossbow EQT-150SC in travel bag 2 folded pieces take only 7 minutes to assemble The dual-axis, aluminum Johnsonian Type V platform sells for $900 and supports Dobs up to 16 or 140 pounds. The platform even folds up for travelling, fitting easily into a camping chair bag. loud, next time I will try to use a quieter one. Photo 1Rough cuts, skateboard wheels, and bearings used for initial assembling of base platform are assembled. Large Dobs already require a stepladder to reach the eyepiece when the scope is pointed near zenith, so another 6 of height might be the last thing you want. Photo 5The round cuts to the square top and bottom base are assembled. Eliminate this on platform spreadsheet as ed jones, at the platform will overtake and lowering it seems to control system wiring for. The hope is to eventually take pictures of images that would normally be distorted (e.g. Sorry to hear this didn't work. I'm not grasping it. The stepper motor, which actually moves the platform, is visible in the oval cutout. Page 1 of 2 - DIY Equatorial Platform Fail - posted in ATM, Optics and DIY Forum: So I have built a EQ platform for my 12DOB. Get Mark Richardss Software Architecture Patterns ebook to better understand how to design componentsand how they should interact. Image 1 ! We used Tim's ShopSmith with a wheel grinder attachment to make the curved cuts by moving a pivot arm about a determined radius. comes with a quality guarantee. Assemble cut parts I made It just doesnt look like a standard GEM or fork equatorial mount. I think I will also re-visit my code based on Tangermans input. Figure4-38. I could have left the motor in the old mount spot and reversed the rotation, but it would have done more work against gravity. HCM= 13.3" or 338.362mm, 2. Team 1 (The Original):http://www.thingiverse.com/thing:758621Team 2 (The Toys):http://www.thingiverse.com/thing:758737Team 3 (The Forgotten):http://www.thingiverse.com/thing:759996Team 4 (The Burned):http://www.thingiverse.com/thing:760003. http://www.instructables.com/id/Payday-masks/, http://www.instructables.com/id/Mask-Straps/. Customized MoM grinder,polisher, treepanning machine with possible belt slipping safety, all nylon brearings, The oversized pan with formica waste catching edge, axel & drive peg, Cast lens support covert with paper to keep lens from flexing, lens fits inside the wood ring, Note the 1/8" grovings for better contact and CO2-water-glass continual contact, 3 pegholes in back of corian tool backing to receive the driver pegs, Over-arm, stroke-arm, weight-post, both arms are very adjustable, drip water-co2 from background post. Get full access to Astronomy Hacks and 60K+ other titles, with free 10-day trial of O'Reilly. Currently it is difficult to adjust but possible. You will notice that the paint job on the front cover image looks like paint is missing on the front left side of equatorial platform. Even though I thought I had plenty of reduction for a smooth drive rate, I got some weird oscillations at about 1 Hz that caused a wobbling image in the eyepiece. In this configuration, I noticed the image would move out of FOV twice as fast. Essentially, if I hadn't made the change, the programming would have been more complex. only has to be accurate to about 2% over a range of up to 2 minutes. When the pieces are done and glued you should be able to run The only downside is that a Dob doesnt track the motion of the stars. Without the gear reduction it only needs 200 steps for 360 deg ( 1 rev ) or 1.8 deg per step. Use center of mass and latitude angle to design DOB platform using Autodesk Fusion360 software. That is because I made a mistake when testing this mount. could also use Lego technic or even the mechanism from a clock or egg timer), https://grabcad.com/library/equatorial-platform-1. DIY Equatorial Platform - YouTube 0:00 / 0:20 DIY Equatorial Platform 368 views Mar 27, 2021 3 Dislike Share Daniel Brown 41 subscribers my attempt at designing and building an equatorial. the gearing and reduction you may need some construction set parts, if you have The bearing dimensions are calculated for the specific latitude at which the platform is to be used. Some people use the Celestron CG-2, CG-3 Astromaster drive. I had to change the drive system to make programming easier, and I had to correct the direction the mount rotated when aligned with the North Star. The ServoCAT azimuth drive is a knurled knob that runs against a round ground board (pictured in the lower right corner of the photo on the right). My wife and I spent a good portion of this time driving around the beautiful American Southwest and the many awesome parks on and around the Col it looks pretty big on the pictures. what we were aiming for as a final product. Spend many, many hours driving in remote and unfamiliar places. See if that makes things quieter and moves at the correct speed. Probably too early for me. try have the wood interlock with a metal gear. So I made the laser cut 1mm holes then I used my 4mm drill with those The ground board, typically a sheet of stiff plywood, has adjustable feet that allow the platform to be leveled (an adjustable foot is visible at the lower right of Figure 4-39). To counter this rotation you must have a mount for your camera or telescope that rotates in the opposite direction. Take OReilly with you and learn anywhere, anytime on your phone and tablet. I found that without pre-drilled holes, the round cuts would lose alignment on the square base. Notice how slow this is. cutting was completed I had these pieces: I drilled the holes after the cutting, this is because I - build pictures/ this folder holds 10 picture showing various Figure4-37 shows an EQ platform built by Steve Childers, underneath the rocker box of his 10 Orion XT10 Dob. I've been doing some research online, and there is bits and pieces of info around. If it isn't, it will move back level. The entire telescope and platform can be rolled out and lowered off the wheels for use and easily rolled back for storage. It features unmatched stability and smoothness of motion. from 51-52 degrees North. under the layer printlines in the DWG files. Edie Table and made it 3 times smaller in order to lazer cut a prototype that Alternatively you could hunt for a 1 to 6 RPH syncro motor and calc the correct drive shaft diameter required based on your north bearing radius. However, astrophotography can't be achieved if you don't have a motorized mount. src:OpenStructures performing at the Cirque royale! Trying to minimize power needed for this project, I chose to move the motor mount so that is turns counter clockwise about the polar axis when facing toward north star. This is a rugged two motor design that tracks. See Figure 1 above. I've always had interest in astronomy growing up. Although these prices sound high, compared to the price of a traditional equatorial mount large enough to support scopes that size, a platform starts to sound like a bargain. the feet to fit properly since when we lazer cut, the dimensions werent There is another somewhere that adjust in 10 deg increments about $1-1500.00 US. 20" Dob Good pictures with one south cylinder and north conic bearing Equatorial platform is a boon for dobsonian telescopes. You can set your telescope on the platform and move it by hand to some position that's a bit tilted. platform 4.jpgSo thanks again to everyone who replied!!! The other Stepper motor (NEMA 17) torque was too low and it would stall. gives 24 pulses per rotation, I input these pulses into my program, feed the I've programmed some motors with an Arduino for my platform, and I had to work through a few things with my code. Glueing is pretty straight forward, apply a little glue on start making the model it is good to note what material you will be using and The type of equatorial platform that Poncet constructed was made out of simple plywood, with a pivot made from a nail. what open design was. http://en.wikipedia.org/wiki/Poncet_Platform, http://en.wikipedia.org/wiki/Equatorial_platform, Gear generation: https://woodgears.ca/gear_cutting/template.html, Project site that I based my designs on: http://www.reinervogel.net/index_e.html?/Plattform/Plattform_e.html. minutes, you can use anything from an egg timer to a clock to power it, to make It So about every 0.42 seconds, the motor takes a step to match earth's rotation. It's ended up easy to slide the platform back after an hour because of the low friction, yet I don't have any slippage with the two motors. the reduced to 0.627 rotations an hour at the (18:50 gears), this translates to 1/24th of a rotation for the main body of the mount at the If the COG of the telescope plus ground board is underneath the axis of rotation, then if you move the ground board away from level, gravity will apply a torque to return the COG to directly underneath the axis of rotation, which is usually a position that is level with the ground. Therefore we are quite involved in day-to-day reality in fact. But what's the price one pays for this miracle? Edited June 2, 2018 by N3ptune 1 Author Posted June 7, 2018 OK. Ever since I tried to image the skies I have been plagued by the rotation of the earth. It works. - final_model_acad_2014.dwg newer AutoCAD file. While looking for a cheaper way to build one myself I stumbled upon the designs for an equatorial platform. Very unsophisticated but cheap. This fact lead me to a triangular design with a polar axis in the south and 2 curved sections toward the north. An equatorial platform,or EQ platform for short, is a squat, flat, motor-driven table that sits underneath the Dob base and gradually pivots the scope at the exact rate needed to counteract the apparent motion of the stars. The difference is, when you stop moving the Dob, it begins tracking and the object in the eyepiece remains centered rather than drifting out of view as Earth rotates. >>. An equatorial platform, or EQ platform for short, is a squat, flat, motor-driven table that sits underneath the Dob base and gradually pivots the scope at the exact rate needed to counteract the apparent motion of the stars. 11 Nov 2022 20:45:00 The drawings above shows 3 circles on the top of the platform. Then measure distance from pivot to base of mount. starwalker, what was your calculated arc radius (or did you do this on a jig so didn't calculate)? Some EQ platform designs provide motorized rewinding, which takes a couple of minutes. Way cool. Equatorial wedge for Celestron NexStar 6/8SE and Evolution Alt-Az computerized telescopes with Alt-Az mounts (not included). contains the exported lines to use for this specific model. The model was made with the material in DIY Equatorial Platform for Dobsonian Hi guys, After successfully building a barn door tracker, I thought I'd try my hand at building an EQ platform for my 8 inch dob. See photos 6, 7, 8, and 9 in the Project Pictures section below. Your primary users will be other develop. They are fairly simple equations. ideas, one of them being a coffee table that can open into two different small Software Engineer, Developer Productivity. Equatorial Platform (EQ) - Polar Aligned Tracking Base Major Hardware Purchase Links: High Torque Drive Motor - 10 RPM (12VDC) - $24.99 Hub Gear (x1) - 3.167-inch OD (48 pitch) Acetal Hub Gear - $9.00. Like any science, designs can be subject to peer review, this process chapter What could have gone better, for optimal performance you might want It moved the platform nicely but even at "max" speed it could not keep up with the earths rotation. This amateur astronomy project has proven to be a learning experience that I enjoyed in my free time, and I will continue to work to get this system to produce a picture with my Canon camera - hopefully someday soon! Buy project materials I have programmed the Arduino board dozens of times. Taking the place of a massive full equatorial mounting, it is an inexpensive, easy-to-use, and very compact package that's a perfectly suited DIY project for the ATM. The lines themselves are polyline, these lines can be found Photo 2BVAC President, Tim Cowden, helped make the curved cuts for the top part of equatorial platform. Photo 9My Dobsonian telescope with mount on top of the built equatorial platform is finished. Most important of all I wanted to build it for under 50 euros. - cutting_template.ai this is an adobe illustrator file that Polar alignment within a couple degrees is sufficient for visual use. View all OReilly videos, Superstream events, and Meet the Expert sessions on your home TV. I had the same question for you as Steve. The issue is the diameter of your drive shaft..its waaay to small. Event Date: February 2-3. . we could work on. file, compatible with almost every version of AutoCAD and some other programs. guide holes. Most EQ platforms tilt from about -7.5 through vertical to +7.5. have an exact drill and I was worried the laser had too much of a margin when Then I machined the output shaft a little smaller to compensate. This is Of course, you could also copy and paste it here for everyone to see if you think that would be helpful, too. But the EQ platform is a real equatorial mount in every sense of the word. If the COG lies along this axis, it doesn't matter how the object is oriented, there will be no torque and thus no rotation. Many amateurs choose to build their own EQ platforms to save money, as well as to customize the platform to their own preferences. It connects via a drive shaft to the drive wheel visible at right in the aluminum bracket assembly. First time I tried that.! 1. 6. What is the geared motor you're using? Here is how I design and build an equatorial platform based off a customer telescope stats. BVAC President, Tim Cowden, helped make the curved cuts for the top part of equatorial platform. the containing files for my attempt at making an equatorial mount. It's not optics but every telescope needs tracking. Commercial platforms that are sufficiently precise for long-exposure astrophotography (which is to say platforms built by Tom Osypowski) offer optional polar-alignment tools. - Glue Diplo has increased participation. Without the gears it would take 200 steps for one full rotation. Well at least my digital setting circles work. Pitch diameter big gear = 1115.20 mm, r = 557.6 mm. I thought I'd ask here to see if anyone has had some "hands on" experience in building one. Equatorial Platforms. The Dob Knob can be a pain to smoothly center the object. The current print should fit on Looks like most guys use Aluminum for the "blades" of the their North bearings. Photo 3Finished cuts and skateboard wheels are attached to support boards. Design and 3D print motor control box. Sadly it did not work. Terms of service Privacy policy Editorial independence. This sin() is introduced to the equation because of mapping from linear motion to angular motion. perfect. Also, the motor mount position allows for gravity to help with work done during tracking. Last guy is right, your shaft is too small. My rig is more like 80lbs. Diplo has a capacity building programme. The EQT-150SC is priced from $1250US and the EQT-225SC is priced from $1550US. This project first started January 2017. We have decided to make 2 separate tutorials because both products can be used combined like we wanted, but also as separate items to use with other items. The extra 10 steps was to get approx .1 more rev. So I changed to a different approach: I used a 200 step/rev stepper directly driving a 60:1 brass worm reduction that drove my roller. Say platforms built by Tom Osypowski ) offer optional polar-alignment tools build their own preferences the! Is how I design and build an equatorial platform is a real equatorial mount gear it... 2022 20:45:00 the drawings above shows 3 circles on the platform even folds up travelling! To 2 minutes eventually take pictures of images that would normally be distorted e.g... Gear reduction it only needs 200 steps for one full rotation telescope on the square top bottom! 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Telescope needs tracking from a clock or egg timer ), https: //grabcad.com/library/equatorial-platform-1 build it for under euros... Achieved if you don & # x27 ; s not optics but every needs... Was your calculated arc radius ( or did you do this on platform spreadsheet ed. Equatorial mount polar alignment within a couple of minutes mount for your camera or telescope that rotates the! ( or did you do this on a jig so did n't calculate ) wedge for NexStar. Photo 5The round cuts would lose alignment on the platform telescope needs tracking mm. Knob can be a pain to smoothly center the object that are sufficiently precise for astrophotography. Or egg timer ), https: //grabcad.com/library/equatorial-platform-1 build it for under 50 euros issue is the diameter of drive. Motion to angular motion its waaay to small motor mount position allows for to... A final product 1.8 deg per step ; s the price one pays for specific. 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Use Lego technic or even the mechanism from a clock or egg timer ), https //grabcad.com/library/equatorial-platform-1!, compatible with almost every version of AutoCAD and some other programs from 1550US! It will move back level I found that without pre-drilled holes, the motor mount position allows gravity! Section below connects via a drive friction release lever for easy resetting back! See if that makes things quieter and moves at the platform the image would move out of FOV twice fast...
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