Quote:
Originally Posted by tilbrook@rbe.ne
Hi,
My 200mm obsrvatory scope has the same friction drive as the 400mm, and works well for CCD imaging, less forces involved.
Look forward to your completed project.
Thanks,
Justin.
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Hi Justin,
would you have any pics of your 200mm obs scope?
can you also post some ccd pics you've taken with this scope? would love to see them.
had a few questions.
with the ac synchronous motor for your 400mm scope, how do you vary the tracking speed as the rate varies a bit depending on where the object is, and the ac motors use the mains freq that cannot be varied?
are you using stepper motors for your obs mount, do you have autoguiding on that, how long can you track without stars trailing and how do you vary speed?
can you also post some pics of the dec drive and clutch?
those are two things I've still not gotten further with.
would also be good to see your rotating upper cage.
i found balancing tricky as well. what i use is a few of the two hole clamps from bunnings, on an elastic band at the top and bottom of the scope.
since its on an elastic, i can easily rotate it to where i want, and i can add or remove clamps easily, just takes a while to get your head around how the fork behaves as its sensitive to balancing errors.
pic attached was my first mount with an F6 where you can see the adjustable weights. have since moved to an F4 and am moving to a tripod design to make it stiffer.
I've also been searching for others with ply forks, found a few of them but not many on this forum.
Ken has an 18.5" F4.5 as he's explained on this thread
http://www.iceinspace.com.au/forum/s...ad.php?t=71519
do you attend any camps? I go to the snake valley camp near ballarat. would be good to see these DIY mounts in person.