This is the first version of CoreXY designed with precision guides to allow it to position accurately under load. Owing to the tools readily available at MIT, it was built from a single sheet of aluminum plate that was cut on a waterjet. Several additional components were laser-cut from acrylic sheet. Assembly was quick, mostly due to the use of epoxy to hold the guide bushings to the aluminum plate.
Core XY Demo with PCB Milling
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| Shoulder screws create cantilevered bearings for the idler pulleys. | X-axis bushings are epoxied onto carriage. |
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| Y-axis bushings are epoxied with support from retainer clips. | Belts are attached to carriage with toothed clips. |
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| Belt tension is applied by sliding stepper motor in mounting slots. | A spindle was designed to attempt milling PCBs with the stage. |
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| Spindle mounted to stage. | Stage mounted to an old Multifab Z axis frame. |
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| Ready to mill! | PCB milled by stage. |
| Vendor | Part # | QTY | Description | Unit Cost | Total Cost | Notes |
| McMaster | 6061K22 | 2 | Precision Shaft, 3/8" OD x 9" L | $4.36 | $8.72 | |
| 6061K108 | 2 | Precision Shaft, 3/8" OD x 10" L | $5.00 | $10.00 | ||
| 6381K451 | 6 | Bushing, 3/8"ID, 1/2"OD, 1/2"L | $1.46 | $8.76 | ||
| 1679K686 | 1 | MXL Timing Belt, 1/4"W, 77"L | $4.36 | $8.72 | ||
| 92095A183 | 20ea | BHCS, M3x12 | $4.00/pk | $4.00 | 100/pack, for t slots | |
| 92095A181 | 8ea | BHCS, M3x8 | $9.37/pk | $9.37 | 100/pack, for motors | |
| 94150A325 | 20ea | NUT, M3 | $3.08/pk | $3.08 | 100 per pack, for t slots | |
| 8505K822 | 1 | 4.5mm Cast Acrylic, 12"x24" | $15.16/sh | $15.16 | thickness varies | |
| SDP/SI | A 6T16M018DF6005 | 2 | Timing Pulley, 18T MXL | $5.81 | $11.62 | Drive pulleys |
| A 6M16M018DF6006 | 8 | Timing Pulley, 18T MXL | $3.67 | $29.36 | Idler Pulleys | |
| S99GGFM050605 | 16 | Bushing, 5mm ID, 6mm OD | $1.22 | $19.52 | Idler Pulley Bushings | |
| A 9X25M0420 | 8 | Shoulder Screw, 5mm OD, 20mm L, M4 | $2.83 | $22.64 | Idler Pulley Posts | |
| Lin Engineering | 4209L-03-01 | 2 | Stepper, NEMA17, 0.9deg/step | $9.99 | $19.98 | from Alltronics |
| generic | 1 | 3/16" Alu. plate, 12"x14" min. |
| File Name | Description |
| corexyr1_SW.zip | ZIP file of all components in Solidworks format |
| corexyr1_IGES.zip | ZIP file of all components in IGES format |
| corexyr1_DXF.zip | 2D DXF files for all waterjet and lasercut components |