dobsonian mount bearings

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November 29th, 2020

Incised slot in comments. of tube assembly sliding laterally. When the two components are assembled, the groundboard sits flat on the ground, with the baseboard above it. Dobsonian telescope mounts move in altitude and azimuth on friction bearings. One mount fits several telescopes. © 2020, O’Reilly Media, Inc. All trademarks and registered trademarks appearing on oreilly.com are the property of their respective owners. Inexpensive standard mount kits. Individual pieces and custom size pieces are also available. The Dobsonian telescope is simplicity itself: a Newtonian reflector mounted on a basic altaz mount. Photo above shows unfinished Mounts - Your Choices: Read The two boards are loosely joined by the azimuth bolt, visible in the center of the groundboard. to match your tube's outside diameter. The scope rotates horizontally on one triple There are two double altitude bearings, one on each side of the telescope tube or mirror box. 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. 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. 1 viewed per hour Dobsonian mount w/ tunable altitude bearings. I have an Orion 203mm (8-inch) reflector telescope (f/4.9) that came as a package deal with the Sirius GoTo mount. Flat 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. O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers. for mirror boxes, or with custom sized curved supports However, I purchased an Orion ED80 80mm (f/7.5) refractor telescope to use with the GoTo mount for astrophotography. Exercise your consumer rights by contacting us at donotsell@oreilly.com. 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. What mount have you got? Designed for Dobsonian and/or Equatorial Head mounting, with or without Altitude Bearings. Many thousands of astronomers have constructed their own Dobsonians, but the satisfaction of building your own mount is immense. We suggest this style small bearing to lift and carry telescope easily. kit.. Dobsonian on small and large bearings. Traditionally a dobsonian telescope has formica-teflon bearings for moving smoothly in altitude and azimuth. The friction must be low enough to allow ... Take O’Reilly online learning with you and learn anywhere, anytime on your phone and tablet. Use Ebony Star and Teflon for butter-smooth motions. 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 an EQ mount PA is about aligning the RA axis of the mount with the North Celestial Pole. 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. Add our mirror masks to eliminate any turned down edge creating the sharpest possible image. The Dobsonian telescope is simplicity itself: a Newtonian reflector mounted on a basic altaz 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. The scope pivots vertically from horizon to zenith on these altitude bearings, one of which is shown in Figure 3-30. precidsely or tune friction to your preference. These suggested sizes will accommodate most telescopes. 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. 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. 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. The key to achieving this ideal situation is to use the correct materials. A Dobsonian Mount is a version of an "Alt-Az" (Altitude-Azimuth) mount. bearing "captures" to eliminate any chance Ive made some modifications to the azimuth bearing and got that pretty nice now. We make no modifications to the design. There are two double altitude bearings, one on each side of the telescope tube or mirror box. The altitude bearing braces are custom cut to fit your telescope tube outside diameter. The altitude needs some attention now. Details about Dobsonian mount w/ tunable altitude bearings. Equatorial mounted Newtonians or SCTs can use their existing rings attach bearings for Dobsonian mounting. This is the style small bearing we make. Custom Dobsonian telescope mounts with many options designed to your specifications, as kits or finished. Get Astronomy Hacks now with O’Reilly online learning. Smooth out your telescope movement with virgin PTFE bearings. Many thousands of astronomers have constructed their own Dobsonians, but the satisfaction of building your own mount is immense. customer's comments, Read customer's azimuth bearing, shown in Figure 3-31. Hence the bearings that allow the telescope to aim in altitude are the altitude bearings. Sync all your devices and never lose your place. Attach altitude bearings to existing rings and mount your OTA as a Dobsonian. Bearings that attach to tubes come with a 3/8" center hole allowing you to bolt to tighten the braces securely onto your tube. 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 . Specify rings mounting choice on our dimensions form. The scope pivots vertically from horizon to zenith on these altitude bearings, one of which is shown in Figure 3-30. the bearing allows nylon screws to position bearing On the left is the bottom of the circular baseboard, which is covered in Ebony Star laminate. Dobsonian telescope mounts move in altitude and azimuth on friction bearings. Terms of service • Privacy policy • Editorial independence, Get unlimited access to books, videos, and. Mirror Cells and Masks Each cell individually designed to assure optimal support points matching your mirror's specs. 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. The triangular groundboard, the top surface of which is shown on the right, has Teflon bearing pads applied directly over its feet. Available It allows easy tube lifting using the cutouts as handles. No deposit refunds after parts are cut. 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. We offer outer 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. When the Dobsonian scope is rotated in azimuth, the laminate surface rides on the Teflon pads, providing smooth movements.

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