Jump to content

Recommended Posts

Whilst I have my imaging mount running my 250P-ds is sitting there redundant. So I thought I'd have a go at building a Dob mount for it and hopefully motorise and add goto eventually.



Here's my initial sketch with the bearings running on the sides. 

I wasn't too happy with the drag factor and possible misalignment causing issues so decided on using ball bearings.



The second iteration makes it easier to add a worm and wheel to the spindle and the ball bearings can be adjusted for alignment.


The final iteration adds some amount of lightness.



I'll be making this from acetal sheet with aluminium cross bars.

Base/Azimuth is 550mm diameter x 8mm thick, sides 360mm x 700mm x 10mm.

I should be able to take out some more material from the base depending on where the motor, worm gear and lazy susan bearing fit.


  • Like 1
Link to post
Share on other sites
  • 3 weeks later...

Made a start at the weekend, so far I've:


1. replaced the dovetail with a 40 x 10mm aluminium bar (plus one the other side)

2. added 20mm stainless axle bars

3. mounted the altitude bearing wheels





  • Like 1
Link to post
Share on other sites
  • 2 weeks later...
  • 2 weeks later...

Made a lot of progress in the last week or so.


Used a template to route out for the 30mm spindle and a trial fit of the lazy susan bearing.

Also did a quick test assembly, this proved a little too wobbly with just the aluminium bars so has a rethink.





Link to post
Share on other sites
  • 1 month later...

That's an impressive transformation, thanks for sharing your processes.

(I'm totally envying that workshop too👍)

Link to post
Share on other sites

Whatever you do for a living, you’re in the wrong trade.......you should be building telescopes for a living!

you have created a quality item.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...