Customising PUMA - part 1: Design and FreeCAD file editing
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- Опубликовано: 15 окт 2024
- Part 2 can be seen here: • Customising PUMA - par... . In this Part 1 video I give a detailed step-by-step and screen cast tutorial on how to customise PUMA to use a 1.25 inch Celestron XCel-LX astronomical eyepiece (with a bonus tutorial on how to use PUMA to find the focal plane of an eyepiece). Even if this specific example is of no interest to you the video gives you the method to follow to make any mod. FreeCAD tutorials are included. All the modified models shown here are on GitHub if you want to use them or compare to your own efforts if you are trying to duplicate what I show you (see links below).
CONTENTS
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00:08 Intro
00:56 Decide what parts need changing
02:19 Quantify the changes
05:13 Finding the focal plane of an eyepiece
12:54 Introductory FreeCAD Tutorial
18:14 Editing the Ocular Cap
27:54 Editing the Ocular Locknut
35:22 Editing the Monocular Tube
52:11 To be continued ...
SUPPORT PUMA
============
PUMA is an open source microscopy project. You can help support the project by:
1. Become a Patron: / pumamicroscope
2. Donate via PayPal: www.paypal.com...
3. Simply subscribing to this RUclips channel, like, comment and share these videos.
4. Spread the word - post the news about PUMA and link to this RUclips channel on your social media sites and any other outreach method (tell your friends, colleagues, students or teachers and lecturers about PUMA, for example).
5. Consider purchasing your optics and related supplies from our affiliated online optics store, OptArc.co.uk ( www.optarc.co.uk/ )
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LINKS / SUPPLEMENTARY INFO
==========================
FreeCAD:
www.freecadweb...
New models and text files made in these tutorials can be downloaded from here:
github.com/Tad...
FOR FURTHER INFORMATION
=======================
1. Open access write-up about PUMA on the FreeCAD blog:
blog.freecad.o...
2. The official PUMA GitHub page where you can download the specs and source files to build or customise your own PUMA system:
github.com/Tad...
3. The scientific peer reviewed publication on PUMA that was published in 2021 in the Journal of Microscopy (a journal of the Royal Microscopical Society) available here:
pubmed.ncbi.nl...
onlinelibrary....
Thanks for your interest in the PUMA microscope system.
PJT 09/12/22
One of the best open full source FreeCAD projects and a fantastic project.
Thanks. The next chapter includes an introductory guide to 3D printing.
So many open source projects are made with solid works, Onshape, etc. It warms my heart to see such a cool project being made with FreeCAD.
I'm so used to using the PartDesign workbench that it weirded me out seeing you using part workbench. The realization slowly sunk in that I need to diversify my workflow when creating parts.
Side note: Step files are all the rage right now, over STL, since they preserve curves.
Thanks for the insight. I am self taught in using CAD and come from a medical (not engineering) background. This might explain my unusual approach. I used 'Part Design' for some of the PUMA components though.
@@PUMAMicroscope The part workbench is less common but definitely not impractical since it's the original modelling method FreeCAD utilized.
Your work on this device is impressive and I've loved the scope I bought from you. I'm getting ready to upgrade it, which is why I'm going through your videos at the moment.
wow, great video, I watched the entire tutorial, very well explained. I got a lot of enthusiasm!
Thanks. Part 2 is out in a couple of days with a general introduction to 3D printing. Please post about the channel on your social media / tell your friends.
Somehow, it's so sad that entertaining video (including flat earth channels and pseudoscience bs) get millions of views and real technical science video get very little.
But, for who want to use internet to it full potential; PUMA Microscope is part of the solution!
Thumbs up and subscribe!!!
Thanks from Montréal, Canada
Thanks for your support.
subbed! great project
Thanks.
One question, what distance should there be between the condenser lenses, should they touch each other or should they be separated?
The PUMA Abbe condenser lenses should be as close as possible without touching. If they touch they can grind a little spot on each other at the point of contact which can be annoyingly visible as a central blurry dark area in your field of vision. The same goes for the two lenses in the lower collector assembly.
@@PUMAMicroscope OK thank you very much
Are there any ongoing efforts to parameterize the parts?
I'm not sure I understand you correctly. All models are already parametric, editable CAD models in FreeCAD - not static STL meshes and such (the idea is that you generate meshes or other printable formats as required from the parametric models using FreeCAD). I haven't put together a set of engineering drawings for the parts with all measurements labelled on them, but that can be done using FreeCAD if anybody wants to.
@@PUMAMicroscope Thanks for the reply. What I meant to ask is whether there are any ongoing efforts to switch to using values referenced from spreadsheets (made using the Spreadsheet workspace) in the constraints for the parts in this project for easier editing rather than having to navigate through sketches and operations to edit parameters.
@@wulfboy_95 Oh, I see - I did not know about that feature. I'm not aware of any such endeavour, although it sounds interesting.
Please tell me you're working on an open 3D-printed equatirial GoTo mount. If so, I'm buying a printer. Your design skills are amazing!
Thanks. There are some open source astro eq. mount projects out there - as I'm sure you know. However that is not my field of expertise - I have a kiddies 4 inch Newtonian with a Japanese eq. mount I got off eBay (because the one that came with the scope fell apart). I started writing some stepper motor control software for guide star control using a RPi but never finished that project. I suspect 3D printed plastic parts won't cut-it for a heavy telescope but never really put my mind to work on the problem because I don't do much astro work. However I intend to show some atro examples in my future image processing videos - a lot of my image processing knowledge (esp. deconvolution) actually comes from the astronomy community (e.g. during the 90's re attempts to fix the original Hubble images).
@@PUMAMicroscope Figured as much, you'd probably still need lots of metal parts. I'm going to buy a printer anyway to build myself a P.U.M.A.
Someone's selling their Ender 3 pro for a few bucks in my area. Will that print this?
Also, has someone had a go at solving the lack of a turret? I could imagine not having a turret, but rather a notched sled with a few objectives lined up in a row and a lid extending far enough on both sides of the scope to protect the inside of the objectives. I dunno, maybe I'll try that myself 😅
Ender3 Pro is more than good enough (I did everything on a standard Ender3) - you just need to ensure it is set up and calibrated right - you will find plenty of help about that on YT. I also plan to make another video on how I set up my printer at some point. Yes, I have thought about a linear slider objective changer but the timing belt gets in the way so any way you try it there will need to be a radical re-design of the stage. A mag changer would be the next best thing but haven't designed one yet. If you come up with a solution please post it somewhere. I hope it goes well. Keep an eye on my channel for updates.
@@PUMAMicroscope Thanks for the info, guess I'll go pick it up tomorrow. I always wanted to have a go at 3D printing anyways, but never had sufficient reason to get one.
I'll have to have a look at FreeCAD, only 3D Software I'm familiar with is Blender, but doing mathematically precise stuff in there is a pretty clunky process. If I can get a grip on FreeCAD I'll try a few things and if anything shows promise I'll let you know.
Thanks for the amazing work so far, I'll be sure to keep an eye on the project!