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That drive wheel bears against and drives the curved bearing surface connected to the top board, upon which the scope rests. Dob Mount Plans - posted in ATM, Optics and DIY Forum: Hi, everyone ! The answer is the equatorial platform or equatorial table, which serves as a tracking platform for the Dobsonian telescope. The stepper motor, which actually moves the platform, is visible in the oval cutout. 0 Like any equatorial mount, an EQ platform must be polar aligned if it is to track stellar motion properly. Some time ago my friend Bill Lofquist bought a dobsonian telescope from Roger Ceragioli. 0000065173 00000 n Figure 4-39. But the EQ platform is a real equatorial mount in every sense of the word. Some EQ platform designs provide motorized rewinding, which takes a couple of minutes. Figure 4-37. In this section we will show you how to build a complete Dobsonian Telescope. It is an Newtonian optical tube, mounted on a very simple, yet very stable and easy to use alt azimuth mount. The only downside is that a Dob doesn’t track the motion of the stars. The Johnsonian Type VI platform is an entry-level model that sup-ports Dobs up to 10” or 60 pounds. 0000003434 00000 n Here you will find plans to build this telescope, or a smaller one--either a 4.5", a six-inch, or an eight-inch--of identical design. I began building it in the spring of 2008, but the bulk of the work was done in July of 2008 with first light occurring on July 25. 0000007483 00000 n Using an EQ platform preserves all of the advantages of a Dob—large aperture; easy, intuitive motions, and so on—while adding all of the benefits of a driven equatorial mount. You, too, can avoid astronomical costs by watching stars through a tricked-out cardboard tube. The Dobsonian telescope is simplicity itself: a Newtonian reflector mounted on a basic altaz mount. Polar alignment within a couple degrees is sufficient for visual use. Draw the outline of the upper part of the mount on the azimuth bearing board. It just doesn’t look like a standard GEM or fork equatorial mount. BUILDING a DOBSONIAN TELESCOPE MOUNT Step 1: BUILDING THE ADJUSTABLE CRADLE. 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 white box on the left contains the electronics that control the speed of the platform’s motion. That means an EQ platform, if it is built precisely and polar aligned accurately, can be used for long-exposure astrophotography without requiring hardware or software field derotators. Money, as per sketch above Osypowski ) offer optional polar-alignment tools for Roger who is one of mount... Simply place the dobsonian mount plans platform built by Tom Osypowski ) offer optional polar-alignment.. Take O ’ Reilly online learning with you and learn anywhere, on! 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