comments. Mounts - Your Choices: Read The scope pivots vertically from horizon to zenith on these altitude bearings, one of which is shown in Figure 3-30. Inexpensive standard mount kits. It allows easy tube lifting using the cutouts as handles. Traditionally a dobsonian telescope has formica-teflon bearings for moving smoothly in altitude and azimuth. Sky-Watcher's 8" Dob has a solid rocker mount, flat equatorial disc stand, and a 1200mm focal length with a 203mm aperture designed for deep-field. On the left is the bottom of the circular baseboard, which is covered in Ebony Star laminate. The friction must be low enough to allow ... Take O’Reilly online learning with you and learn anywhere, anytime on your phone and tablet. Page 1 of 2 - Dobsonian mount azimuth bearing stiction - posted in Reflectors: I have an Orion XX12i Dob and one of the challenges of using the telescope is stiction on the azimuth bearing. on small and large bearings. The altitude needs some attention now. azimuth bearing, shown in Figure 3-31. for mirror boxes, or with custom sized curved supports Use Ebony Star and Teflon for butter-smooth motions. O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers. When the two components are assembled, the groundboard sits flat on the ground, with the baseboard above it. The key to achieving this ideal situation is to use the correct materials. precidsely or tune friction to your preference. The triangular groundboard, the top surface of which is shown on the right, has Teflon bearing pads applied directly over its feet. A Dobsonian Mount is a version of an "Alt-Az" (Altitude-Azimuth) mount. As a result, the reflector began to collect dust, so I decided to give it new life by making a Dobsonian mount for it. There are two double altitude bearings, one on each side of the telescope tube or mirror box. Specify rings mounting choice on our dimensions form. We suggest this style small bearing to lift and carry telescope easily. Add our mirror masks to eliminate any turned down edge creating the sharpest possible image. Attach altitude bearings to existing rings and mount your OTA as a Dobsonian. Terms of service • Privacy policy • Editorial independence, Get unlimited access to books, videos, and. Smooth out your telescope movement with virgin PTFE bearings. Bearings that attach to tubes come with a 3/8" center hole allowing you to bolt to tighten the braces securely onto your tube. Many thousands of astronomers have constructed their own Dobsonians, but the satisfaction of building your own mount is immense. The two boards are loosely joined by the azimuth bolt, visible in the center of the groundboard. Incised slot in This arrangement seems simple enough in theory, but in practice there are three requirements for ideal Dob bearings: Ideal bearings have perfect friction, not too much and not too little. The scope rotates horizontally on one triple One of the special features of our OD Dobsonian Mount is the ability for existing owners of our OTA's (or even competitor's OTAs) is to be able to just drop their tube straight into one of our mounts. We offer outer Standard Dobsonian Mount Kits: Inexpensive standardized sized solid mounts and altitude bearing kits for 6" f/8, 8" f/6 or 10 f/4.7 telescopes. The scope pivots vertically from horizon to zenith on these altitude bearings, one of which is shown in Figure 3-30. Individual pieces and custom size pieces are also available. Get Astronomy Hacks now with O’Reilly online learning. Photo above shows unfinished of tube assembly sliding laterally. Equatorial mounted Newtonians or SCTs can use their existing rings attach bearings for Dobsonian mounting. All kits contain 3 azimuth and 4 altitude bearing pads of 3/16" (0.19") minimum thickness virgin PTFE, pre-drilled and countersunk, with stainless steel mounting screws. A further tremendous advantage is the ability to exactly balance the tube to avoid it moving with the weight of added equipment, large eyepieces, cameras, large finders etc. Many thousands of astronomers have constructed their own Dobsonians, but the satisfaction of building your own mount is immense. Dobsonian Bearing Materials The key component of a Dobsonian Mount is its bearings - they should be "buttery smooth", moving without a startup 'jerk' and holding the telescope position when no pressure is applied. Mirror Cells and Masks Each cell individually designed to assure optimal support points matching your mirror's specs. customer's comments, Read customer's Exercise your consumer rights by contacting us at [email protected]. The Dobsonian telescope is simplicity itself: a Newtonian reflector mounted on a basic altaz mount. 1 viewed per hour Dobsonian mount w/ tunable altitude bearings. Page 1 of 2 - dobsonian altitude bearings - posted in Reflectors: Ive been at this over 3 years now, and I still I have my first scope, the Orion XT10 Dobsonian. Hence the bearings that allow the telescope to aim in altitude are the altitude bearings. Ive made some modifications to the azimuth bearing and got that pretty nice now. The Dobsonian telescope is simplicity itself: a Newtonian reflector mounted on a basic altaz mount. Flat However, I purchased an Orion ED80 80mm (f/7.5) refractor telescope to use with the GoTo mount for astrophotography. kit.. Dobsonian 18 hours ago, Jiggy 67 said: You can’t that I’m aware of, unless you’re using a camera and some form of software but I’m no expert in that. © 2020, O’Reilly Media, Inc. All trademarks and registered trademarks appearing on oreilly.com are the property of their respective owners. I have an Orion 203mm (8-inch) reflector telescope (f/4.9) that came as a package deal with the Sirius GoTo mount. Designed for Dobsonian and/or Equatorial Head mounting, with or without Altitude Bearings. Available The altitude bearing braces are custom cut to fit your telescope tube outside diameter. This works well, but for tiny movements: putting an on object exactly in the midpoint of the field of view, especially when the object is somewhere near the zenith, this kind of bearing can still be too sticky. Dobsonian telescope mounts move in altitude and azimuth on friction bearings. These suggested sizes will accommodate most telescopes. to match your tube's outside diameter. On an EQ mount PA is about aligning the RA axis of the mount with the North Celestial Pole. This is the style small bearing we make. There are two double altitude bearings, one on each side of the telescope tube or mirror box. What mount have you got? Used in conjunction with the two included eyepieces (30mm and 9mm) and Dobsonian stand, this telescope will make your night-sky observations and star parties more enjoyable than ever. Dobsonian telescope mounts move in altitude and azimuth on friction bearings. bearing "captures" to eliminate any chance When the Dobsonian scope is rotated in azimuth, the laminate surface rides on the Teflon pads, providing smooth movements. The XX12i has 3 Teflon pads on the top side of the ground board and a ring of EbonyStar on the under side of the other board or upper 1/2 of the azimuth bearing . One mount fits several telescopes.
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