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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Choose the design and aperture size. Telesope aluminum tubing is used to attach the mirror box to the secondary cage. First, mark your drilling holes.

Next, you will need a spider and a secondary mirror, also called as a diagonal mirror.

I found a used 16″ primary on eBay. For assembling the box, right angle clamps would be handy, but not necessary.

If you are handy with the jigsaw, and want your mount to be lighter and easier to transport, you can cut out the mount like on the picture below.

Nothing to install on your computer – you just need an up-to-date web browser.

Build a Backyard Dobsonian Telescope

We have arranged the the steps in a logical progression below, and that is how we will proceed to built this telescope. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins.

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. The base and xobsonian rocker box in my telescope are secured with a skate bearing assembly but could be more simply attached with a bolt through the center.


Preparing the Tube, Making “Spider”; Eyepiece tube. In most shops, you can bring a cutting list, and you receive ready cut, square pieces. Build a Dobsonian Telescope: It is held together by gravity alone.

Build a Backyard Dobsonian Telescope

A view of the bottom of the mirror cell with the primary mirror in place. The optical tube is done. Also, installing a handle on the altitude bearing box will make transporting and setting up your telescope much easier.

Now that we have a nice and stable mount, we can continue building the optical tube assembly OTA. Mount the secondary mirror to the spider with an adhesive mount. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a dobsonkan knob.

They need to be felescope least 25 mm tall to provide enough clearance on uneven ground. Newt-Web Newtonian Telescope Design Web Application We use this free web application to calculate tube dimensions and component placement, and to check for vignetting.

Dobsonian Telescope Plans

You may now raise a glass plana the great John Dobson. One, because this is–hands down–the cheapest and easiest way to make a quality telescope; and two, because I walk in the shadow of John Dobson, who invented many of these designs which have revolutionized amateur and professional astronomy alike After making the cutout, draw a 19 mm strip45 cm long, on the further side of the sideboard refer to picture above Again, use a 4 mm drill bit, and sink in the screw heads.


On the other hand, the faster focal ratio will want more expensive eyepieces, and is more demanding on collimation. Now secure the baffles in place and cover them with another layer of plywood — poans as to give it the appearance of an optical tube. It just missed placing in the optical competition. The plastic will ride on teflon pads, creating just tdlescope traction for the telescope tellescope avoid sliding on its own while not making it too difficult to point at things in the sky.

The scope was entered in the optical and mechanical competitions. Dobson shows you how to build a Dobsonian telescope.

Apply some glue, align the azimuth board and screw everything together with 4×50 wood screws. To avoid rework and scrap, please proceed in the order we present the plans.

DIY: Building a Dobsonian Telescope At Home

Most popular are the mm F8 and the mm F6. Place the mirror cell on to the optical tube. Draw the circle and you are ready for cutting. Newsletter to keep you inspired with new projects and more product reviews.

Place the secondary mirror into the spider. These are items even the most seasoned TM telescope-maker usually buys from small telescope part manufacturers: