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Dr_Ju_ju

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Posts posted by Dr_Ju_ju

  1. Give it a go, it will be a great learning experience for you....

    You can build-in tilt correction, strengthening etc. as long as you keep an eye on the back focus... 

    As for printing fine threads, yes it is possible, as long as your slicer/printer is capable of it e.g. printing at 0.05 mm layer height, but for 'production' use I'd be tempted to use brass inserts, to hold parts together, and for the inter equipment connections.

    I'd base the control on an Arduino system, for which there are plenty of examples available, with motor control, positional detectors etc, and there are even Ascom divers available.

    • Like 2
  2. In answer to Vlaiv, here are some studies comparing PLA/ABS/PETG:

    https://3dinsider.com/abs-vs-pla/   https://www.3dsourced.com/guides/pla-vs-abs-filament/

    https://3dsolved.com/pla-vs-petg/  https://www.3dprintingspot.com/post/petg-vs-pla-main-pros-cons-of-both

    Personally I've found that while PLA prints easily, and is great for initial test printing of parts for Astro/outside items etc, over time it will warp, shrink and/or 'break' down, especially if the sun can get at it ...

    I've regularly printed using ABS, but it does require a closed room, not necessarily an enclosure, and an application of Elmers/Koores glue stick, to the bed (mine are all PEI sheets) to ensure first layer adhesion. While the the bed temperature required is higher (85c as opposed to 60c), after the first 5/10 layers are completed the bed temperature can be reduced... 

    I used Voron Designs recommendation to use ABS, when I printed the parts for my Voron2 machine, all printed on an OLD Prusa i3 MK2 ...

    Hence my recommendation to use use PETG, to mainly get around the limitations of PLA/ABS.

    Yes there are additional steps required, mainly in the slicer to get a 'cleaner' print etc.  (After trying many others, I settled on using PrusaSlicer...) overall I'm more than satisfied with PETG, and I used it to re-print the Z carriage/Extruder parts for my Prusa i3 Mk2, following many years of service, but an unfortunate accident cased some damage, and I wanted to upgrade some parts... 

     

     

  3. If configured properly, then what you linked to, would hopefully drive the mount to point the scope to the right part of the sky.... 

    BUT, if you want to truly ensure, that it is indeed pointing at what you want it to point to, and ensure that it keeps pointing at that target, then you need a system that will look at the sky, take an image of what it's supposedly looking at, compare it with a reference image of the target, and then adjust the mount position to correspond to that image.

    You could use the main scope to do that, but it's usually better to use a separate guide camera, to perform that function, which can also be used by separate dedicated software to keep things aligned, e.g. PHD2 etc.

          

  4. If you want a more robust solution, and have the space to mount the connectors, then I'd recommend "Speakon" multi-pole connectors e.g. https://www.ebay.co.uk/itm/304607702082?hash=item46ec08ac42 & https://www.ebay.co.uk/itm/284973314751?hash=item4259bbb2bf, they are relatively easy to knock-up and have a simple insert/twist mating action, which has a wiping function that cleans the mating surfaces.

    I also use a lot of the GX series (12/16) connectors e.g. https://www.ebay.co.uk/itm/284010878622?hash=item42205e169e, these are a simple insert with rotary locking ring.... 

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