Hadley Telescope Remix (Metric, Mods & More)

prusaprinters

Official metric remix of Maff's amazing Netwonian reflector telescope nicknamed <a href="https://www.printables.com/model/224383-astronomical-telescope-hadley-an-easy-assembly-hig">“Hadley”</a>.A full set of stls are available, along with the full CAD model and a BOM.!!---------- Important Section ----------!!<ul><li>Please print the “Hardware Test Print” first</li><li>If you have tolerance issues either:<ul><li>Edit the variables in the CAD to suit your printer or:</li><li>Let me know and I will update the stls</li></ul></li></ul>!!---------- End of Important Section ----------!!ChangesThe changes I have made are as follows (everything below available as native CAD in the linked Onshape document):<ol><li>Remixed the original CAD to natively support M4 metric hardware</li><li>Remixed primary mirror cell to use hex bolts inserted through the cell and extending out of the back</li><li>Remixed the spider hub to match the OD of the secondary mirror holder (to block less light)</li><li>Added new spider with a single nut slot (to stop nut-alignment issues) and with triple curved vanes using maths from DOI: <a href="https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10745/2326923/Novel-designs-for-minimizing-diffraction-effects-of-large-segmented-mirror/10.1117/12.2326923.full">10.1117/12.2326923</a>, with annular apature = 0.2 and vane thickness = 0.01D (1.2mm)  N.B. UNTESTED but should be noticeably “better”, see notes later</li><li>Changed the nut slots to hexagonal to more securely capture the nuts</li><li>Slots instead of captured nuts in the spider (similar to several other remixes), spaced correctly for M4 pitch and 0.28mm layers</li><li>Rebuilt the focusser component to fix the geometry errors (should make remixes much easier)</li><li>Remixed the <a href="https://www.printables.com/model/254079-hadley-telescope-double-dovetail-finderscope-mount/comments">Double finderscope mount</a> for M4 metric</li><li>Remixed the <a href="https://www.printables.com/model/266322-hadley-secondary-mirror-holder-m4-slotted-bolt-rem/comments">Secondary holder remix</a> for an M4 hex bolt</li><li>Made new thumbscrews for the secondary collimation assembly</li><li>Remixed the <a href="https://www.printables.com/model/262764-hadley-telescope-rocker-frame">Rocker frame</a> for 12mm rods and M4 hardware</li></ol>Personal ModsThere are also a number of custom mods which deviate from “Hadley but Metric” which I have included in a separate assembly in the CAD in case anyone wants them.<ol><li>Added test prints for the 12mm and M4 hardware, as well as several tolerance options for the focusser threads (start at 0.6mm clearance and go up/down from there)</li><li>Focusser with a different handwheel, more of a “machinists handwheel” vibe.  Just a personal preference.  The OD mactches that of Maff's handwheel.  Both mine and the original (remixed to metric) are provided.</li><li>Remixed the UTA and LTA to accept a “sleeve”.  This is useful if you want to print theese components in not-black but don't want to paint them.  The sleeves themselves are printed as single walls in vase mode in black.  Again both the original (remixed to metric) and sleeve version are provided.</li><li>Added CAD mockups for the Celestron red-dot and generic 6x30 and 9x50 finder scopes</li></ol>I also printed and used several other mods and add-ons (both for Hadley and otherwise), listed below:<ul><li><a href="https://www.printables.com/model/238330-hadley-mirror-and-lens-covers/">Mirror covers</a> - fit perfectly on 12mm rods (a very satisying snap)</li><li><a href="https://www.printables.com/model/245036-center-spot-finder">Center spot finder</a> - extremely useful for collimation</li><li><a href="https://www.printables.com/model/256728-cheshire-collimation-eyepiece-for-reflector-telesc">Collimation eyepiece</a> - similarly useful for collimation</li><li><a href="https://www.thingiverse.com/thing:5186470">Open Ocular 2.0</a> - an open source smartphone mount scope adapter</li></ul>Print settings<ul><li><a href="https://github.com/VzBoT3D/VzBoT-Vz330">VzBoT </a>330</li><li>eSun PLA+</li><li>3 walls, 3 top and bottom</li><li>0.6mm walls, 0.28mm layers (I have a weird belted drive gearbox so a full steps is an odd interval)</li><li>13% grid infill</li></ul>Purchased components<ul><li>Mirror set - <a href="https://www.ebay.com/itm/144370428628?hash=item219d25ead4:g:CLwAAOSw37RheRSY">Any 900/114 mirror set</a></li><li>Eyepiece (1) - <a href="https://www.amazon.co.uk/Svbony-Telescope-Eyepiece-Accessories-Astronomy/dp/B07BFVT1S8/ref=asc_df_B07BFVT1S8/?tag=googshopuk-21&linkCode=df0&hvadid=463264511915&hvpos=&hvnetw=g&hvrand=5628604748499379721&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1006967&hvtargid=pla-564202296854&psc=1">Svbony 6mm</a> (150x at 900mm focal length)</li><li>Eyepiece (2) - <a href="https://www.ebay.co.uk/itm/224692997555?hash=item3450bf0db3:g:rxgAAOSw~M9hkUUb&amdata=enc%3AAQAHAAAAwK%2BG3l9XlzJBgx9ms6zCxLJCwjEfHm7w8pngUexq8t0UvX6o0ARumBBjqkrN8%2F5yCOpZxdWoP6jHLfh4r39abMcPYz%2FZupy75L5uEKIUG2h47ts7UAJ5RicNz3GiXwQolKQcOcB0ffG0BtNQvzOR91MtQVtB8wM8RlsDH7rXbvf%2FP7ReQM%2FZdGusDWH1oz%2Fri%2BTK5VaaD%2FETJtByBAsDfQU9C%2BuN4d5eHsxEYJHDb8UX6OPC0Chhcm4nOhFwTVX4gA%3D%3D%7Ctkp%3ABk9SR7D9443YYA">Svbony 25mm</a> (36x at 900mm focal length)</li><li>Finderscope (1) - <a href="https://www.amazon.co.uk/Celestron-51630-Pointer-Telescope-Finderscope/dp/B00009X3UU">Celestron 51630 Star Pointer</a> (so easy to set up and works great)</li><li>Finderscope (2) - <a href="https://www.amazon.co.uk/Svbony-Finderscope-Achromatic-Viewfinder-Crosshairs/dp/B08KF2ZQ4S">Svbony SV182 Finderscope 6x30</a> (soon)</li></ul>Spider<ul><li>The triple-curved-vane spider should (according to the paper I used to make it) give a noticeable “improvement” to the diffraction pattern (providing it is strong enough, which remains to be seen as I haven't installed it yet).</li><li>The original triple-straight-vane spider has a vane width of 0.035D, compared to the curved version with 0.01D.  The change should be something like in the image below from figures 16 and 17 in the paper (showing straight vanes with 0.05D and 0.02D compared with a 0.01D curved vane)</li></ul><figure class="image image-style-align-center image_resized" style="width:64.2%;"><img src="https://media.printables.com/media/prints/268580/rich_content/49a4b2a9-705a-458a-9977-7cd4f0bc4fd1/spider_comparison.png#%7B%22uuid%22%3A%22ec0ff776-a60d-45e3-9042-70a3d280b327%22%2C%22w%22%3A1530%2C%22h%22%3A1700%7D"></figure>My list of “to be created” include:<ol><li>Cap for the secondary mirror</li><li>Thumbscrews for the focusser eyepiece clamps</li><li>Fully parametric Hadley to scale up/down to different mirrors</li><li>Holders for spare lenses/scopes/parts for the printed telescope stand, sort of a remix of <a href="https://www.printables.com/model/269938-dobsonian-mount-storage-fits-hadley-telescope-moun">this version</a> for the wooden design</li><li>Some kind of (I think) rack & pinion system for accurately rotating the telescope base/stand.  Maybe belted to avoid issues with gear backlash?</li><li>Instead of (3), a full (driven/tracking?) rotating & tilting mount, although I'm not sure how well 3D printing is suited to that kind of model.  Maybe with positional servos instead of steppers.</li></ol>Print orientationsThe stls are not orientated in the print direction but most slicers will let you place them on a selected surface.  Use the image below for reference.  There are also images which show the assembly of the primary and secondary mirror cells as they differ slightly from Maff's original version. (Please excuse the poor prints, the black filament I had on hand was old and wet)<figure class="image image_resized" style="width:100%;"><img src="https://media.printables.com/media/prints/268580/rich_content/2d96a799-7777-40cd-a738-d7f0eb0377f4/hadley-print-orientation.png#%7B%22uuid%22%3A%2205b46a6e-9eb9-40f9-9b6b-c4a39a4fd671%22%2C%22w%22%3A1923%2C%22h%22%3A701%7D"></figure>Assembly - LTA<figure class="image image-style-align-center"><img src="https://media.printables.com/media/prints/268580/rich_content/d26d8859-fa9f-4e4e-82ba-8434a6858623/image.png#%7B%22uuid%22%3A%226b461dfd-9155-466e-a8a7-fbfe99f13926%22%2C%22w%22%3A1205%2C%22h%22%3A568%7D"></figure> <figure class="image image-style-align-center image_resized" style="width:49.83%;"><img src="https://media.printables.com/media/prints/268580/rich_content/c84c60ad-253f-4a81-a08d-e905c76054c6/hadley-primary-assembly.jpg#%7B%22uuid%22%3A%22fa00096e-793f-42a0-bc93-1ddebd59ee0a%22%2C%22w%22%3A1204%2C%22h%22%3A1600%7D"></figure>Assembly - UTA<figure class="image image-style-align-center"><img src="https://media.printables.com/media/prints/268580/rich_content/d81e7141-f731-415d-b7f7-7fcaa03c3a4b/image.png#%7B%22uuid%22%3A%22b921f94b-947b-4ec5-83a8-d26b34812ee7%22%2C%22w%22%3A1740%2C%22h%22%3A1167%7D"></figure><figure class="image image-style-align-center image_resized" style="width:50.24%;"><img src="https://media.printables.com/media/prints/268580/rich_content/b0bf5c5c-c629-458d-8108-574ef97669de/hadley-secondary-assembly.jpg#%7B%22uuid%22%3A%222f04e702-0a2b-4528-8a9c-41fc5dc46a17%22%2C%22w%22%3A1204%2C%22h%22%3A1600%7D"></figure>You will notice that lots of the things I have done are available in other remixes, there are a few reasons for this:<ol><li>I started this project before most of the other remixes were released and have been using it to learn Onshape</li><li>The model is reasonably parametric so if you (for example) wanted the 12mm rod holes to be 12.7mm for printing you can change one number and the whole model “should” be updated</li><li>I wanted a central resource for my metric version of the CAD so I didn't have to rely on various stls</li><li>I wanted it to be done “my way”, never satisfied with parts which would print and function perfectly well but might have some odd geometry errors</li></ol><figure class="table"><table><thead><tr><th style="text-align:center;" colspan="2">Hadley BOM</th></tr></thead><tbody><tr><td style="background-color:#40C8E818;" colspan="2">UTA Assy</td></tr><tr><td>M4 x 8mm socket head cap screw</td><td>3</td></tr><tr><td>M4 x 12mm socket head cap screw</td><td>8</td></tr><tr><td>M4 x 16mm socket head cap screw</td><td>4</td></tr><tr><td>M4 x 50mm hex bolt (40mm also works)</td><td>4</td></tr><tr><td>M4 hex nut</td><td>21</td></tr><tr><td>M4 nyloc nut</td><td>1</td></tr><tr><td>M4 dome nut (optional)</td><td>3</td></tr><tr><td>Spring - at least 4.5mm ID, ~10mm long</td><td>1</td></tr><tr><td style="background-color:#40C8E818;" colspan="2">LTA Assy</td></tr><tr><td>M4 x 12mm socket head cap screw</td><td>6</td></tr><tr><td>M4 x 50mm hex bolt</td><td>3</td></tr><tr><td>M4 hex nut</td><td>6</td></tr><tr><td>M4 nyloc nut</td><td>3</td></tr><tr><td>Spring - at least 4.5mm ID, ~15mm long</td><td>3</td></tr><tr><td style="background-color:#40C8E818;" colspan="2">Bearing Interface Assy</td></tr><tr><td>M4 x 12mm socket head cap screw</td><td>3</td></tr><tr><td>M4 x 20mm socket head cap screw</td><td>8</td></tr><tr><td>M4 x 25mm socket head cap screw</td><td>2</td></tr><tr><td>M4 hex nut</td><td>13</td></tr><tr><td style="background-color:#40C8E818;" colspan="2">Printed Rocker Assy</td></tr><tr><td>M4 x 12mm socket head cap screw</td><td>12</td></tr><tr><td>M4 hex nut</td><td>12</td></tr><tr><td>12mm round bar x 0.5m (longer is okay)</td><td>4</td></tr><tr><td style="background-color:#40C8E818;" colspan="2">Misc - Sights, Dovetail Scope mount</td></tr><tr><td>M4 x 12mm socket head cap screw</td><td>6</td></tr><tr><td>M4 hex nut</td><td>6</td></tr><tr><td style="background-color:#40C8E818;" colspan="2">Totals</td></tr><tr><td>M4 x 8mm socket head cap screw</td><td>3</td></tr><tr><td>M4 x 12mm socket head cap screw</td><td>35</td></tr><tr><td>M4 x 16mm socket head cap screw</td><td>4</td></tr><tr><td>M4 x 20mm socket head cap screw</td><td>8</td></tr><tr><td>M4 x 25mm socket head cap screw</td><td>2</td></tr><tr><td>M4 x 50mm hex bolt</td><td>7</td></tr><tr><td>M4 hex nut</td><td>58</td></tr><tr><td>M4 nyloc nut</td><td>4</td></tr><tr><td>M4 dome nut (optional)</td><td>3</td></tr><tr><td>12mm round bar x 1m</td><td>3</td></tr><tr><td>12mm round bar x 0.5m</td><td>4</td></tr><tr><td>Spring - at least 4.5mm ID, ~10mm long</td><td>1</td></tr><tr><td>Spring - at least 4.5mm ID, ~15mm long</td><td>3</td></tr></tbody></table></figure>The End

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