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README.md 5.20 KiB

UrumbotXY 2.0

This project aims to push the limits of easy-to-replicate, high performance cable driven motion. This coreXY motion platform uses a nylon-coated steel cable under high tension to transmit fast and precise motion.

Fabrication

This design uses a mix of flat parts, and 3D printed parts.

The flat parts can be laser cut or waterjet out of a material 3-5mm thick. A file containing all the parts can be found here, and fits on an A4 page:

The files to 3D print can be found here, and fit on a standard Prusa bed. The recommended material for the print is PETG, though PLA can be used if no other option is available. The main issue with PLA is that is will creep overtime, offering no long term guarantees on a mechanical part.

Once the files are ready, gather all the hardware you'll need and follow the assembly steps below.

Assembly

Here are the parts you'll need to assemble one of the two carriages supporting the gantry:

On the top of the carriage, place the V-wheels and the flexure:

In between the two plates, come the three wheels, with spacers on both sides:

After adding the bottom plate, finish off with the bottom flexure. This one is designed to hold the nuts in place:

Tighten the screws holding the two V-wheels. Start tightening the third screw, but do not tighten it all the way:

After sliding the carriage onto an extrusion, the flexure should help tensioning the carriage to just the right amount. If that is not the case, your extrusion might have a different pitch, and you'll need to print a different flexure. If the motion seems smooth while pressing onto the extrusion the right amount, tighten the last screw to finish off:

After repeating those operations for a second carriage, build the frame with four brackets on the bottom side:

You can now assemble the toolhead's carriage. The construction is similar, but starts with inserting M3 nuts on the bottom side of the top flexure part. This part is more complex, as it is also used to terminate the cable.

Place the flexure on the top plate, and insert the M5 screws:

Add the wheels and the front plate, which also serves as spacers for the two wheels in the front.