By Telescope Making Magazine Editors
How you can construct a Dobsonian Telescope!
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Additional resources for How to Build a Dobsonian Telescope
If you don't have a large closet or garage, put a lampshade on your scope and store it in your living room! Remember: Door jambs destroy homemade focusers! Cover your scope when not in use--dust and moisture--are the enemies! Plastic garbage bags, at both ends, work fine. Despite your best efforts; your mirror will accumulate dust, and will require cleaning from time to time... Remember: this is a "first surface" mirror--a very fine deposit of aluminum is deposited on the surface--you do NOT want to introduce any "micro scratches" here!
If it does, you will have to increase the height of the mounting blocks as necessary. The mirror mounting blocks are designated PART F in the plywood cutting plans. The mounting blocks are screwed in place inside the telescope tube. The mirror sits on the two bottom blocks and should just clear the top blocks under no circumstances should the mirror be pinched or squeezed between the blocks. If the blocks are cut from 3/4" plywood and are 1" wide (they should be about 4" long), we will probably have to place two blocks with the 3/4" side "up" and two blocks with the 1" side "up" in order for the mirror to fit nicely (see diagram above).
Before installing the mirror). INSTALLING THE MIRROR When the tailgate is snug, we are ready to install the mirror. (Of course, you will have to remove the tailgate again). CAUTION: HANDLE YOUR MIRROR INDOORS OR IN THE SHADE!!! Installing the mirror--very carefully! Carefully place a sticker or decal at the exact center of the mirror. This sticker will be used later to align both the diagonal mirror and the objective mirror. After installing the mirror, close up the tailgate... and screw the tailgate in.