Official metric remix of Maff's amazing Netwonian reflector telescope nicknamed “Hadley”.  Make sure you go and read his Printables post too, as well as the #hadley-instructions channel on his Discord server, as it includes some extra info about print settings and assembly.
A full set of stls are available, along with the full CAD model and a BOM.
!!---------- Important Section ----------!!
- Please print the “Hardware Test Print” first (the arrow on the print faces vertically upwards)
- If you have tolerance issues either:
- Edit the variables in the CAD to suit your printer or:
- Let me know and I will update the stls
!!---------- End of Important Section ----------!!
Changes
The changes I have made are as follows (everything below available as native CAD in the linked Onshape document):
- Remixed the original CAD to natively support M4 metric hardware
- Remixed primary mirror cell to use hex bolts inserted through the cell and extending out of the back
- Remixed the spider hub to match the OD of the secondary mirror holder (to block less light)
- Added new spider with a single nut slot (to stop nut-alignment issues) and with triple curved vanes using maths from DOI: 10.1117/12.2326923, with annular apature = 0.2 and vane thickness = 0.01D (1.2mm)
- Changed the nut slots to hexagonal to more securely capture the nuts
- Whole new focuser here
- Remixed the Double finderscope mount for M4 metric
- Remixed the Secondary holder remix for an M4 hex bolt
- Made new thumbscrews for the secondary collimation assembly
Personal Mods
There 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.
- Added test prints for the 12mm and M4 hardware
- New options for the focuser which incorporate a 45 degree thread profile allowing for better printing and smoother actions. Â These have been moved over to a new Printables post (this one is already getting too long).
- 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 versions, of the UTA and LTA, are provided.
- Added CAD mockups for the Celestron red-dot and generic 6x30 and 9x50 finder scopes
I also printed and used several other mods and add-ons (both for Hadley and otherwise), listed below:
- Mirror covers - fit perfectly on 12mm rods (a very satisying snap)
- Center spot finder - extremely useful for collimation
- Collimation eyepiece - similarly useful for collimation
- Open Ocular 2.0 - an open source smartphone mount scope adapter
Mount
The original square rocker-frame you see in the pictures isn't sufficiently stiff to enjoy using Hadley. Â The best options are: 1) build a wooden frame like in the original post, 2) build a frame with aluminium-extrusions and a printed bearing mount, 3) use a vastly improved printed mount like Ivan's or Marci's.
Print settings
- VzBoT 330
- eSun PLA+
- 3 walls, 3 top and bottom layers
- 0.6mm walls, 0.3mm layers (you can use whatever you want here, just remember, smaller layers are stronger, but take longer to print)
- 20% grid infill (any infill type that is strong is all directions will be fine e.g. grid, gyroid, triangles)
Purchased components
- Mirror set - Any 900/114 mirror set
- Eyepiece (1) - Svbony 6mm (150x at 900mm focal length)
- Eyepiece (2) - Svbony 25mm (36x at 900mm focal length)
- Finderscope (1) - Celestron 51630 Star Pointer (so easy to set up and works great)
- Finderscope (2) - Right-angle RACI 9x50 Finderscope, a 6x30 is also very common (I got mine used from eBay)
Spider
- The triple-curved-vane spider should (according to the paper I used to make it) give a noticeable “improvement” to the diffraction pattern.
- The original triple-straight-vane spider has a vane width of 0.035D, compared to the curved version with 0.01D. Â 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)
Print orientations
The stls are not orientated in the print direction but most slicers will let you place them on a selected surface. Â Use the image below for reference. Â 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)
Assembly - LTA
Assembly - UTA
You will notice that lots of the things I have done are available in other remixes, there are a few reasons for this:
- I started this project before most of the other remixes were released and have been using it to learn Onshape
- 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
- I wanted a central resource for my metric version of the CAD so I didn't have to rely on various stls
- 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
| Metric Hadley BOM | |
|---|---|
| UTA Assy | |
| M4 x 8mm socket head cap screw | 3 |
| M4 x 12mm socket head cap screw | 8 |
| M4 x 16mm socket head cap screw | 4 |
| M4 x 50mm hex bolt (40mm also works, you might need to shorten the springs) | 4 |
| M4 hex nut | 21 |
| M4 nyloc nut | 1 |
| M4 dome nut (optional) | 3 |
| Spring - at least 4.5mm ID, ~10mm long | 1 |
| LTA Assy | |
| M4 x 12mm socket head cap screw | 6 |
| M4 x 50mm hex-head bolt | 3 |
| M4 hex nut | 6 |
| M4 nyloc nut | 3 |
| Spring - at least 4.5mm ID, ~15mm long | 3 |
| Bearing Interface Assy | |
| M4 x 12mm socket head cap screw | 3 |
| M4 x 20mm socket head cap screw | 8 |
| M4 x 25mm socket head cap screw | 2 |
| M4 hex nut | 13 |
| Misc - Sights, Dovetail Scope mount | |
| M4 x 12mm socket head cap screw | 6 |
| M4 hex nut | 6 |
| Totals | |
| M4 x 8mm socket head cap screw | 3 |
| M4 x 12mm socket head cap screw | 23 |
| M4 x 16mm socket head cap screw | 4 |
| M4 x 20mm socket head cap screw | 8 |
| M4 x 25mm socket head cap screw | 2 |
| M4 x 50mm hex-head bolt | 7 |
| M4 hex nut | 46 |
| M4 nyloc nut | 4 |
| M4 dome nut (optional) | 3 |
| 12mm round bar x 1m | 3 |
| Spring - at least 4.5mm ID, ~10mm long | 1 |
| Spring - at least 4.5mm ID, ~15mm long | 3 |
The End.
Hadley Telescope - Official Metric Remix
by wigglememore · original on Printables ↗
Learning / Physics & Astronomy
♥ 883⬇ 3.8k🖨 81 prints
Print profiles
Hadley - UTA Assy - Dovetail mount.stl
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Hadley - UTA Assy - Secondary Cell Thumbscrew.stl
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Hadley - UTA Assy - Spider.stl
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Hadley - UTA Assy - Secondary Mirror Cell.stl
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Hadley - LTA Assy - LTA Sleeve.stl
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Hadley - LTA Assy - Primary Mirror Cell.stl
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Hadley - UTA Assy - Secondary Collimation Plate.stl
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Hadley - UTA Assy - UTA Sleeve.stl
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Hadley - UTA Assy - Focuser Body.stl
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Hadley - LTA Assy - LTA for Sleeve.stl
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Hadley - LTA Assy - LTA.stl
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Hadley - Misc - Farsight.stl
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Hadley - Misc - Nearsight.stl
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Hadley - Bearing Assy - Bearing Interface.stl
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Hadley - UTA Assy - UTA for Sleeve.stl
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Hadley - UTA Assy - UTA.stlDEFAULT
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Hadley - UTA Assy - Baffle.stl
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Hadley - Test - Hardware Test print.stl
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Hadley - UTA Assy - Spider - Curved & Thin.stl
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Hadley - Bearing Assy - Bearing Mount Wide Spacer.stl
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Hadley - UTA Assy - Collimation Thumbscrew.stl
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Hadley - UTA Assy - UTA (smaller file size).stl
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Hadley - Bearing Assy - Bearing 1.stl
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Hadley - Bearing Assy - Bearing 2.stl
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Hadley - Bearing Assy - Bearing Mount Interface Wide.stl
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Hadley - LTA Assy - Collimation Thumbscrew.stl
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