Since you are reading this, you are probably considering to build your own Dobsonian telescope. This page provides detailed plans and instructions how to . Plans for a homemade Dobsonian telescope. Since you are reading this, you are probably considering to build your own Dobsonian telescope. Homemade Inch Dobsonian Telescope: How to build a inch closed tube Dobsonian telescope. I began building it in the spring of , but the bulk of.

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DIY: Building a Dobsonian Telescope At Home

Also, installing a handle on the altitude bearing box will make transporting and setting up your telescope much easier. John does not like or encourage the term Dobsonian, but his wishes have not been followed and everyone uses the term. It just missed placing in the optical competition. Place the telescope within the holder and bolt the hold to the top of the base. You might also like these newsletters: It won an Innovative Component Award for the adjustable cradle design.

You will get everything you need from the local hardware store. You can buy some ready made parts, or you can make everything on your own, including the mirrors and eyepieces.

Place the secondary mirror into the spider. As the telescope tilts toward the horizon, the mirror must be supported on its edge. At about the inch size, it is more practical to switch to a truss-tube design, which we will not cover at this time see [Kriege97] for very good plans on building large aperture truss-tube Dobsonians. You will get boards in a few colors and patterns Mount the focuser on to the optical tube.

You can view and download the full file here. Use 4×50 mm wood screws, and some carpenters glue in-between the contacting surfaces. You also need to sink in the screw heads. Now that we have a nice and stable mount, we can continue building the optical tube assembly OTA.


Two sideboards, and a front board. Please check your email eobsonian confirm. This is how a finished altitude bearing box dbsonian like: Mark 3 drilling holes per strip, 30 mm from the edges, and one in the middle. They are popular with astronomers dobssonian all levels of experience and training, from beginners and amateur hobbyists to professionals and experienced scientists.

The aperture size is the diameter of the primary mirror. For a mm F6 primary, a 40 mm minor axis secondary is needed.

Use a 4 mm bit for the holes. Your changes have been saved.

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Build a Backyard Dobsonian Telescope

Besides, Los Angeles Sidewalk AstronomerPam Reid, did most of the work by writing and typing the procedures, as well as gathering the drawings–which, by the way, were done by Earl Jungians from photographs of John at work by Molly Lusignan. Build a Dobsonian Telescope Introduction Our Dobsonian sits in the garden at dusk cooling down for the nights observing.

Mark the spots where you want the bolts to go.

Mark your drilling holes, as per sketch above. By adjusting the bolts, the mirror can be pointed toward the correct spot.

Build a Backyard Dobsonian Telescope

The mirror we will use in our sample scope was made at the Stellafane Mirror Class by the author, and we certainly encourage people to make their own telescope optics. Using plywood, make 4 attachment blocks to pair the trusses together and create a small ledge for the secondary cage to rest on while you secure it.

Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. For this, use the measurements from the design program to determine where exactly to mount the spider and at what distance from the optical tube.

You will need the right number of baffles. Most of my “work” consisted of scanning and re-typing Pam’s work If you happen to own one of these scopes; you might well peruse these pages to find ways to tinker and fix up your mass-produced Dob: It is important that the center of the PVC plug is mounted at the center of the even sided square of the box.


Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. In most cases, when parts like spiders, diagonal holders, mirror cells and focusers are required, we will tell you how to build your own, or if you choose, what purchase if you don’t want to make that component. Orient this assembly to allow you to view an object on the far horizon.

A router with a compass would be perfect for this job, but it can easily be done with a jigsaw too. While a sling or whiffletree provide the best edge support, a two-point edge support is much easier to construct.

A closeup look at the bolts ddobsonian threaded plates for attaching the secondary cage to the trusses. The most important components are the optics, primary and secondary mirrors.

The intersection is the center of the telescpoe. It features 2 semicircular arms, and mounting points for the trusses T-nuts are fineas well as a lid to keep the mirror safe when the telescope is not in use.

It ain’t cobsonian science! During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. Skywatcher 10 inch Dobsonian. Newsletter to keep you inspired with new projects and more product reviews.

Baffles are octagonal wood pieces that are placed within the tube which lend it support and help direct the light through the various mirrors and lenses of the tube. Dobson made the telescope completely from simple, ordinary household items; a process that you can replicate yourself.