In this version, I started to use 2040 (20mm x 40mm) profile instead of 2020, but when I switched to linear rails the 2040 was too high. Using linear rails resulted in tighter tolerances and smoother operation.
I installed two of linear rails on top of the 2040 profile Y-axis (the sides) and threaded ends of 2040 profile in order to screw the motor mount directly to it (instead of using a corner brace). I had to redesign and reprint the motor mounts. When it was all put together and I was admiring how good it looked and how sturdy it was, I realized the linear rails added 13 mm in height to the Y-axis, resulting in the motor timing gear and end pulleys no longer in alignment. Grrrrr...a aliq
I installed two of linear rails on top of the 2040 profile Y-axis (the sides) and threaded ends of 2040 profile in order to screw the motor mount directly to it (instead of using a corner brace). I had to redesign and reprint the motor mounts. When it was all put together and I was admiring how good it looked and how sturdy it was, I realized the linear rails added 13 mm in height to the Y-axis, resulting in the motor timing gear and end pulleys no longer in alignment. Grrrrr...a aliq
Electronics
I realized early that the Arduino Nano that was in the original design was somewhat lacking in speed and memory. I was going to use an Arduino Due or Mega that overcomes these deficiencies but they are huge in physical size. I had an ESP32 "in stock", which I've never used, so decided on this for the MCU.
The sensor board shown below went through another iteration: I put the sensors at 45 degree angle (as shown) instead of vertical, to get maximum coverage by the floating magnet. I also put the multiplexer and 8 pin IDC connector on the OTHER side of the board so the parts would fit flat, even with the sensors. Sensors face the magnet.
The sensor board shown below went through another iteration: I put the sensors at 45 degree angle (as shown) instead of vertical, to get maximum coverage by the floating magnet. I also put the multiplexer and 8 pin IDC connector on the OTHER side of the board so the parts would fit flat, even with the sensors. Sensors face the magnet.
I made this tester so I could test and calibrate the position of the magnet. Go here for details of this instrument: StepperTester
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How to use 2040 profile
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How CoreXY works
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Using wheels on 2020 V-profile
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Changing 3D printed parts to suit other modifications, using TinkerCad
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Converting V-profile to linear rails
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Swapping out an Arduino Nano for an ESP32
I did learn some stuff along the way, so it wasn't a total loss!
Second Build
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