Hadley Universal Attachment Mount

This was initially an attempt for me to revamp my old PiFinder mount. As I made changes and improved over the original design, the idea morphed and congealed with several other ideas that I've had for quite a while now and this was the result.

- Background and Part Terms -

At this point in time, this mount exclusively uses M3 and M4 hardware and heat sets; however, I have adapted the core of the mount to be compatible with 12mm rod, ½ inch rod, and ½ inch EMT conduit Hadley builds.  I can design more mount cores by community request.

Currently, there are 3 subunit categories for this system: the mount core, the alignment plate, and the “wings”. 

• the mount core is both where everything attaches to the telescope and it's the component that the rest of the subunits are assembled around.  
• the alignment plate attaches to the top of the core and is meant to prevent the mount from rotating when attached to a rod.  the “ears” of this part wrap around the rod guide fins of the UTA, MTA, or LTA of Hadley.  An M4 bolt or thumbscrew is slotted into this and through the mount core to secure the whole mount to your Hadley.
• the wings are the main point of customization of this project.  Currently there is Dovetail and Picatinny rail support.  I have also made additional specific holders for laser pointers and the PiFinder.
   

- Printing -

I designed for and printed these parts in PETG for heat/impact resistance and superior layer adhesion.  3 walls, 20% infill at 0.2mm layer heights. Everything is designed to print without supports.  Printing orientation guide is above at the end of the image gallery.

- Heat Sets and General Assembly -

This project uses a lot of heat set inserts because I anticipated semi-regular disassembly/reassembly for customization.  I recommend getting them in bulk from aliexpress because they are a whole lot cheaper than amazon, however the shipping is a lot slower.
Aliexpress M3xOD5mm, 4mm Length
Aliexpress M4xOD5mm, 4mm Length

Mount Cores all take 8x M3 heat sets and 2x M4 heat sets, all 4mm long.  

• 4 of the M3 heat sets go on top to attach the Alignment Plate
• the other 4 M3 heat sets are split between both sides of the core to make up the lower half of the wing mount
• the remaining 2x M4 heat sets go in the center of the mount core and these are for attaching the core to the rods that make up the Hadley.  be weary to not push these in too far or you'll have problems sliding the core over the rods of your scope.

Alignment Plates take 4x M3 heat sets

• the 4x M3 heat sets are split between both sides of the alignment plate to make up the upper half of the wing mount.  Use 4x M3x10mm bolts to fix this to the mount core. If you use “alignment plate flat” you can use some M4 bolts or thumbscrews to fix your mount to Hadley.  The picatinny/dovetail alignment plates are not compatible with thumb screws, so just use M4 bolts instead.
• The dovetail alignment plate can take up to 2x additional M4 heat sets for thumb screw retention

Wings vary in the number of required heat sets.  generally, any holes that aren't the 4 that attach the wing to the core/alignment plate will require a heat set of some form.  The wings attach to the rest of the mount via 4x M3x6 screws

• the laser wing has 6x M4 heat sets for the adjustable thumb screws for holding the laser pointer.  When attaching this wing, make sure that the first layer side points towards the “ears” of the alignment plate.

• the dovetail wing takes up to 2x M4 heat sets for the thumbscrews that are used to hold down your preferred attachments.
• the picatinny rail wing uses 2x M3 heat sets to attach the rail to the wing mount.  attach the wing to the mount and align the arrows on the two parts and use 2x M3x8mm bolts to assemble.
• the pifinder wing takes 1x M4 heat set for an adjustable thumb screw to hold down the pifinder's dovetail mount.

subunit assembly is pretty straightforward, but heres a color-coded assembly example.  each of the three subunits is a different color; blue is the mount core, green is the alignment plate, and the yellow parts are the wings

the laser wing is made of 3 parts.  The laser switch spring fits into the slot on the laser switch slider, then the slider can clip onto a side of the laser holder, pictures for more detail below.  My spring friction-fit in place, but you may need to glue yours in place or scale the spring down in your slicer by 1-3%