Quote:
Originally Posted by 2stroke
Rick its mean Periodic error http://www.cloudynights.com/item.php?item_id=2750 . The worm on mine was aluminum gear with a brass worm, they gears were badly turned and nothing like today's quality. You can get lucky with some parts of the worm gear and others are just bad, then the worm it self was pretty shotty limiting to around 20 secs. The mount has a number of things from the dc gear drive to the plastic bushes used for bearings which cause error. Some people have machined them out and added tapered roller bearings and even a new worm drive which then makes them very nice. For visual and planetery work though these things are the beast, lol gave up on the eq platform when i got mine because the thing could do a way better job  |
Just pulled the cover of my drive . The gears are all brass with brass bushes and screws to tighten backlash? The motor is 240v. I have searched cave optical and they were top of the range hand crafted scopes in the 60's and early 70's. I have had it tracking perfectly for 30 mins with only minor adjustments to a variable speed drive corector a guy in Adelaide made for me in the 80's. (and of course good drift alignment)