Almost a year ago I decided to make a Dobsonian style reflector telescope. I finished it late in the spring and was able to enjoy it all summer, fall and even a little during the winter. I've observed Saturn, Jupitor, star clusters, nebula and spiral galaxies. It truly was a rewarding project and I still use it on a regular basis.
When I built my telescope I used a 1.25" rack and pinion style focuser. It has worked OK, but I knew there had to be something better out there. The motion on the rack and pinion focuser is not very smooth and it seemed to make large jumps in focus for small movements at the knob.
After some research I discovered that many amateur telescope makers use a Crayford style focuser due to its simple design and smooth motion. Many focusers also make use of a planetary reduction knob for fine focus adjustments. With these design goals in mind I set out to make my own.
Please be sure to read my summary at the end if you want to follow my Instructable to make your own focuser. I give a review on how well it performs and what changes I plan to make on my next revision.
There are a few features I want to point out that may not be obvious at first glance. They are what makes this focuser a step above my previous one. These features are on various focusers that I came across while researching how to make mine, but I don't think I found one with all of these features (except for the expensive ones).