Quote:
Originally Posted by quantoid
I have a Bintel Dobsonian and when viewing it's really hard to keep it still because the base turns so freely. Any tips for locking the base in position?
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Firstly, having the base on a level surface is a good start.
With a free moving base, there will be a tendency for it to want to swing "down-slope".
I built a levelling base that the mount just sits into. (I chose "Form PLY" for water resistant qualities and relative cheapness) with adjustable height feet from Bunnings. Either plastic kitchen furniture legs (about $4) or metal furniture screw in legs ($20). Plastic ones seem to work better as they have a larger base and don't sink in to the grass.
Mine was a Skywatcher with a central bolt in the middle of the base. I could get some improved friction by tightening that. Not sure if Bintel DOB is similar design.
After that, a piece of carpet or soft felt furniture slides between the rotating and fixed parts of the base should help.
Otherwise
Do a google search on improve stiction Dobsonian.
or check out the projects and articles section in the left column here on IIS.