Jump to content

Banner.jpg.39bf5bb2e6bf87794d3e2a4b88f26f1b.jpg

Counterweights for a dob?


Recommended Posts

Managed to get out for a quick session with the new goto dob on Sunday night - will post more in a review, but just one question first. It was fine apart from at low altitudes, then it struggled with the weight of the "nose" and kept dipping. I assume I need some sort of counterweight - what do people use on a dob, and would it affect its performance when it's pointing higher up?

Link to comment
Share on other sites

Hi Wulf,

Look forward to seeing the goto dob in action sometime soon.

I find the best place to weight a Dob so that it doesn't over compensate at higher altitudes is slap bang in the centre back of the mirror.

Of course mine has a thick piece of ply so I could screw a magnetic knife holder from Ikea ( IKEA | Wall & workspace organisers | Rails & wall storage | BYGEL | Magnetic knife rack ) to attach weights it's strong enough to hold an old counterweight off an EQ3.

Link to comment
Share on other sites

Thanks for the suggestions. Is there anything nice and simple for someone who's basically completely hopeless at DIY? Anything that involves drilling the tube is far too scary... I'm just proud that I've managed to unscrew a focuser and replace it with another in the same screw holes! Any way I can attach weights to the back of the mirror without risking wrecking the scope? :D

Link to comment
Share on other sites

Only yesterday I ordered a 10cm diameter magnet to stick to my 250 dob. I got my dob second hand and the previous owner had upgraded the focuser to a dual speed, and now its top heavy, plus when I put the break on it still slips down a fraction, enough to lose the object that I am looking at.

I have just ordered a wixey and am attaching a holder for my Android phone to my dob as well (trying Google sky as a poor mans push to)

Link to comment
Share on other sites

I use some 2 inch squares of mild steel painted with hammorite and heavy duty velcrose (hook side) and have a strip of heavy duty velcrose (loop side) across the bottom of the dob and depending on the weight of the eyepieces attach as many weights to the bottom of the dob as needed. it works but does not involve any drilling or anything of a permanent nature.

Link to comment
Share on other sites

my tubes are both aluminium.

bot sure about SW though.

I have done this in two ways. I recently bought a used set of tube rings and they work a treat.

another is http://stargazerslounge.com/diy-astronomer/109577-latest-dob-mods-fan-balancing-weight.html

yet another option is car wheel balancing weights which are self adhesive and can be stuck inside the bottom of the tube?

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

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • 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.