Focuser

I made this Crayford style focuser using plywood scraps and surplus bearings. To test the concept I used a short piece of two inch PVC for the draw tube. I used my router to "mill" a flat area for better contact with the focus adjustment rod. I'll use an aluminum tube for the finished draw tube but for now the plastic tube works fine


Crayford Focuser 1









The aluminum focus adjustment rod is supported by two bronze bushings that are in slotted holes in the focuser body. The two thumb screws push on the bushings to increase or decrease tension between the rod and the draw tube.

Crayford Focuser



Crayford Focuser







Crayford Focuser 4
Bronze bushing

Crayford Focuser