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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You will also be receiving the weekly Make: Take a old ruler, or a piece of wood, drill the same 8 mm hole at one end, put the M8x60 screw trough and drill dobsomian small hole 4 mm is fine at the outer edge of the board. It is very important that the hole is vertical relative to the board, since this is the axis of the azimuth bearing.

Thanks for your submission. Our goal here is to guide you through building a basic Dobsonian that will function well, and our choices reflect that.

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.

It features 2 dobxonian 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.


Dobsonian telescopes have a very simple reflector design, which is why they are very easy to make at home.

Build a Backyard Dobsonian Telescope

Also, around cm long. It is held together by gravity alone. They are easy to use, are strong and robust and inexpensive. Once your telescope dobsoian assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. You may now raise a glass to the great John Dobson. You also need to sink in the screws, do it well on this board, because the azimuth bearing will not be able to rotate if the screw heads are sticking out.

The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks.

The even sided boards do not need drilling. Move the jigs until you can comfortably place a variety of eyepieces in the focuser and get a sharp image, then carefully measure the lpans distances.

Build a Backyard Dobsonian Telescope

To avoid rework and scrap, please proceed in the order we present the plans. The next step is to mount the primary mirror and place it in the mirror cell.

Build a simple optical tube. The spider and secondary mirror mounted within the secondary cage. The bolt head should face the ground. It is an Newtonian optical tube, mounted on a very simple, yet very stable and easy to use alt azimuth mount.


Posted on March 15, June 20, by Oliver Cromwell. The first step to building a Dobsonian telescope is to choose the aperture size and the focal length. Finally you will need to make a ground board, a round plywood piece that ensures that the mount is as stable as possible. It was first referred to as the “sidewalk telescope”. A router with a compass would be perfect for this job, but it can easily be done with a jigsaw too. Choose the diameter of the focuser base — you will know this from the design program.

Going for a shorter focal length will give you a shorter, more compact tube, easier to transport. Leave a Reply Cancel reply Your email address will not be published. Use toothpicks to ensure there is enough space between the mirror and the holder. O n one side of the board, put 5 felt pads, the same one used on furniture feet. You can also make this mount out of 19 mm plywood, or laminated wood.

June 20, Dobsonian Telescopes are the simplest types of telescopes. Do this very delicately; there should not be any bending of the mirror.