UrumbotXY Fall 2022

This project is a corexy 2D motion system using serialstep. Modified from original files in UrumbotXY.

CoreXY

For a simple coreXY motion system, here is the list of parts you need to make:

It is advised to 3D print capstan_motor and capstan_pulley, while all other parts can be machined or laser cut. 3D models files are available under ./files/3d, and dxf files under ./files/2d.

For assembly, you will also need:

• 2x NEMA 17 motors
• 9x bearings
• 8x V bearings
• 4x small bearings
• M5 screws (structure and bearings)
• M5 nuts and washers
• M3 screws (string tensioners)
• M3 nuts and washers

Complete Bill of Materials (BOM) here

Assembly of XY axes.

Assemble y-plates

y-plate from the top: single bearing side (left) and tab side, with stack of bearings. (right)

y_plate: single-bearing side with adjuster (left), and two-bearing side (right).

Assemble xy-plate and table

Bottom view.

XY_plate and table: two-bearing side (left) and one-bearing side with adjuster (right).

Assemble motor on motor mount.

Assemble pulleys on pulley mount.

Assemble X1 frame part with feet. Add Y1 and Y2 frame members.

Add motor mounts.

Place xy-plate on x-beam, and attach y-plates.

Add to frame.

Add final beam frame member.

Add pulley plate and adjust feet.

Add string.

Note how the string is inserted on the capstans. The string can be attached to temporary anchor points to provide enough tension during this step. Inside capstan_pulley, you should insert a small bearing at the top and bottom. Use appropriate washers to have the correct height; there are 4 levels on capstan_pulley, and they should be aligned between each levels of capstan_motor.

Add pen actuator.

Pen plotter

Pen:

Drawing: