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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.

 

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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.

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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.

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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.

 

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  • 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

 

 

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  • 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.

 

 

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