Jump to content

Ceph and Cass

130p focuser mod?


Russe
 Share

Recommended Posts

Getting a 130p to play ball the way I want to, turns out to be quite difficult.

After moving the primary mirror up the tube to achieve focus with camera and visually, I'm now faced with a rubbish focuser. While moving the focuser tube up & down, the tube shifts by a almost a millimetre.

This puts the scope into collimation on the way down and out of collimation on the way up.

Any ideas what I could do?

I'll post pics of what a few bits of Velcro have done for me so far, but I'm not happy...

Link to comment
Share on other sites

post-17961-137552501514_thumb.jpg

I've put Velcro in the "gear" compartment, to achieve better connection of rack and pinion.

And,

post-17961-137552510631_thumb.jpg

I've shimmed it on the inside with hard Velcro.

I've tried shimming it from all sides, but then the tube wouldn't move anymore.

With this one piece of Velcro, the tube already barely moves. But still has <1mm slackness.

Link to comment
Share on other sites

Mhm. Better, but the velcro's compressible. Still moves towards the rack n pinion when bringing the tube downwards.

It needs plastic shims I guess.

Where could I find some cheap ones? Any ideas?

Link to comment
Share on other sites

I think the rack and pinion itself is badly designed, allowing for a minute degree of change in the focuser tube's movement axis while changing directions.

Don't know what to do.

Anyone?

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.