Proxxon Micro Mill Semiautomatic-CNC
by _AidenB_ in Circuits > Arduino
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Proxxon Micro Mill Semiautomatic-CNC
![0C3DF9AC-96D9-4F5E-A4ED-131B3ACE8D04.jpeg](/proxy/?url=https://content.instructables.com/FVE/NR55/KAQSHLLK/FVENR55KAQSHLLK.jpg&filename=0C3DF9AC-96D9-4F5E-A4ED-131B3ACE8D04.jpeg)
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Hello! I’m a junior high student and this is my arduino project. This is an instruction about modifying proxxon mf-70 from full manual into semi-automatic. If you’re interested, please watch the video!
Video:
Control Board-1
![85583ABC-D3C3-49DA-AA7E-FA1326FF9C1F.jpeg](/proxy/?url=https://content.instructables.com/FJL/PK5R/K9K8IA8X/FJLPK5RK9K8IA8X.jpg&filename=85583ABC-D3C3-49DA-AA7E-FA1326FF9C1F.jpeg)
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Material
- Aluminum (100x80x1mm)
- Wood board (120x200x12mm)
- Push switch
Tools
- Chisel (12, 30mm)
- Handsaw
- Jigsaw
- Drill
Method
Aluminum board
- Draw mark for inserting the push switches
- Drill hole that fits the push switches
Wood board
- Use hand saw to cut the wood board into the size of
- Draw lines for inserting the aluminum board and LCD screen
- Use jig saw to saw out the lines
- Use 30mm chisel to make the side smoother
- Use 12mm chisel to cut out notch that can fit the LCD screen (like the picture above)
- Use 12mm chisel to cut out a slope at the edge of the LCD screen area (like the third picture above)
Control Board-2
![7D2B6F81-AC3A-4C29-B449-9CB32602AC22.jpeg](/proxy/?url=https://content.instructables.com/F0J/UFYY/K9K8IE4Y/F0JUFYYK9K8IE4Y.jpg&filename=7D2B6F81-AC3A-4C29-B449-9CB32602AC22.jpeg)
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![7855D13F-385F-4883-86CE-D36E8F55B315.jpeg](/proxy/?url=https://content.instructables.com/F8P/6836/K9K8IE61/F8P6836K9K8IE61.jpg&filename=7855D13F-385F-4883-86CE-D36E8F55B315.jpeg)
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Material
- Led(Red and Green)
- LCD board https://www.amazon.com/SunFounder-Serial-Module-D...
- Screw m3
- Keypad (4x4) https://www.amazon.com/Matrix-Membrane-Switch-Key...
Tools
- The same
- Screwdriver
Method
Aluminum board
- Drill two more holes to place in the LEDs
- Insert it by placing it inside if it fits and not loosely or glue it on the wood
LCD screen
- Place the LCD board in the wood board
- Screw (like the picture above)
Key pad
- Drill holes in a line on the area that the wire has to go through
- Use 12mm chisel to make it square
- Make the wire go through the back of the wood board
- Wrap off the white layer of the key pad
- Stick it on the wood board
Control Board-3
![B3295B80-0768-480A-8B59-CB93AB49256B.jpeg](/proxy/?url=https://content.instructables.com/FXB/7ZV8/K9K8IG69/FXB7ZV8K9K8IG69.jpg&filename=B3295B80-0768-480A-8B59-CB93AB49256B.jpeg)
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Material
- Arduino Nano
- Jump wires
- Breadboard
- Computer (downloaded Arduino)
Method
- picture above
Circuit
- Picture above
- LCD i2c (SDA-A4)black
- LCD i2c (SCL-A5)blue
- LCD i2c (VCC-5v+)red
- LCD i2c (GND-GND)black
- Push switch1 (the right one above the green LED-D13)green
- Push switch2 (the one at the left of this one↑-D11)Red
- Red LED (connect with the push switch2)
- Green LED (connect with the 5v+)
- Keypad (connect from D10 to D3)
Program
Proxxon Micro Mill — Material
![9DA54419-B8CC-40A2-A8A4-4A4E6E87ACDC.jpeg](/proxy/?url=https://content.instructables.com/F7P/4DOJ/KA6SCK20/F7P4DOJKA6SCK20.jpg&filename=9DA54419-B8CC-40A2-A8A4-4A4E6E87ACDC.jpeg)
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![DDA46625-F9B4-4699-829A-87EBDEF8032B.jpeg](/proxy/?url=https://content.instructables.com/F1V/W84T/KA6SCL20/F1VW84TKA6SCL20.jpg&filename=DDA46625-F9B4-4699-829A-87EBDEF8032B.jpeg)
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Material (for each axis)
- Thrust bearing x1 https://goods.ruten.com.tw/item/show?217422420585...
- Bearing adapter x1 (Pre-processing)
- Diameter 2mm axle x1
- Axle adapter 4.5-5mm x1
- Stepper motor x1 https://goods.ruten.com.tw/item/show?214051710720...
- Stepper motor adapter x1 (Pre-processing)
- m3 screw x3
- Copper pillar x3
- M3 Spacer x3
Tool
- Hex key (
- Vernier scale
Pre-processing
![5F831539-A2AC-4FF5-A146-DCEFD4366B10.jpeg](/proxy/?url=https://content.instructables.com/FTS/HZV2/KAMI9PRQ/FTSHZV2KAMI9PRQ.jpg&filename=5F831539-A2AC-4FF5-A146-DCEFD4366B10.jpeg)
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Method
Stepper motor adapter (for x and y axis)
- Combine two cut 3mm acrylic board (design page dxf(1))
Disassemble the handle (x and y axis will be mostly the same)
- Unscrew the screw
- Remove the dial scale (there’s a small pin will pop out)
- Use a 1.9mm pin and a hammer to knock the pin for connecting the handle out
- Remove the black plate (pic 7)
- Drill three holes on it for connecting stepper motor (only for z axis)
Cutting the stepper motor axle (the shortened length will be different for x, y, z axis)
- Measure the length of the axle that has to be shortened (Mark it with marker)
- Use tape to protect the motor from the dust
- Use grinding wheel to cut the axle (wear gloves)
Cutting the copper pillar
- Measure the length of the copper pillar that has to be shortened (Mark it with marker)
- Use grinding wheel to cut the copper pillar (wear gloves)
Thrust bearing adapter (design page 3dm(1))
- Use CNC to mill aluminum to form the shape
- Mill a trench for fitting a 2mm pin (2mm mill head)
X-axis
![32D2756D-EACF-47A1-8D0F-76A55C440BF1.jpeg](/proxy/?url=https://content.instructables.com/FUD/L435/KA6SCL66/FUDL435KA6SCL66.jpg&filename=32D2756D-EACF-47A1-8D0F-76A55C440BF1.jpeg)
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Method
- Screw the copper pillar on the stepper motor(do not screw it too hard)
- Screw the stepper motor adapter onto the three copper pillar with 3 m3 screws (the screws might have to be cut shorter to fit)
- Screw the axle adapter on the stepper motor axle (make sure it’s screwed on the flat surface of the shape axle)
- Insert the thread bearing onto the bearing adapter
- Screw the stepper motor adapter on the mill with two m3 screw
- Screw the axle adapter on the mill axle
Y-axis
![C31CFFA0-78FF-4B31-BDF0-F51EB1E2AC86.jpeg](/proxy/?url=https://content.instructables.com/FSX/LOMZ/KA6SCLLA/FSXLOMZKA6SCLLA.jpg&filename=C31CFFA0-78FF-4B31-BDF0-F51EB1E2AC86.jpeg)
![421DE48A-202E-46D2-8180-4DF0EBEDBCE3.jpeg](/proxy/?url=https://content.instructables.com/F27/3NJ4/KA6SCLLD/F273NJ4KA6SCLLD.jpg&filename=421DE48A-202E-46D2-8180-4DF0EBEDBCE3.jpeg)
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Method
- Screw the copper pillar on the stepper motor(do not screw it too hard)
- Screw the stepper motor adapter onto the three copper pillar with 3 m3 screws (the screws might have to be cut shorter to fit)
- Screw the axle adapter on the stepper motor axle (make sure it’s screwed on the flat surface of the shape axle)
- Insert the thread bearing onto the bearing adapter
- Screw the stepper motor adapter on the mill with two m3 screw
- Screw the axle adapter on the mill axle
Z-axis
![A105E75C-0392-4BBF-BFA8-FBD614097AC3.jpeg](/proxy/?url=https://content.instructables.com/F7P/RTA1/KAL2TUBG/F7PRTA1KAL2TUBG.jpg&filename=A105E75C-0392-4BBF-BFA8-FBD614097AC3.jpeg)
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Method
- Screw the copper pillar on the stepper motor(do not screw it too hard)
- Screw the copper pillar on the black plate
- Insert the thread bearing onto the bearing adapter
- Screw the axle adapter on the stepper motor axle (make sure it’s screwed on the flat surface of the shape axle)
- Screw/unscrew the hex nut on the z-axis thread in order to adjust the position of the hex nut (Before the black plate was screwed on the mill
- Screw the black plate on the mill
- Soldering the stepper motor 4 line wire (If the order is incorrect)
Stepper Motors Protection Cover
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Method
- Use laser cutter to cut the acrylic in shape (Design page dxf(2))
- Use clamps to hold the acrylic (picture 5, 6, 7, 8, 9)
- Heat the acrylic with a heat blower (picture above)
- Drill two holes on one side on the acrylic (picture 11)
- Screw m3 screws on the acrylic with hex nut
- Attach the protection cover on the x, y axis (picture 14, 15, 16)
Arduino + CNC Shield
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CNC sheild https://goods.ruten.com.tw/item/show?2172447624178...
Connect Arduino uno with CNC shield
How to connect two Arduino
- connect Arduino nano tx to Arduino uno rx
- connect Arduino nano rx to Arduino uno tx
- Share the same GND
Designs
File:https://drive.google.com/open?id=1sYZMpM7S5FVr36sa...
3dm files:
- axle adapter (for cnc)
- Whole layer (how to assemble layer1 and layer2)
dxf files:
- layer 1 (stepper motor adapter)
- layer 2 (stepper motor adapter)
- stepper motor protection cover
How to Use the Control Board
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How
- Push switch 2(above the red LED) Change mode:On-mode 2, Off-mode 1
- Mode 1
- A: x-axis
- B: y-axis
- C: z-axis
- *: move— +the variable
- #: move— -the variable
- 0: reset the coordinate to (0, 0, 0)
- 1: move 0.1mm
- 2: move 1mm
- 3: move 10mm
- Mode 2
- A: Feed rate
- B: Show coordinate
- Number key(has to push the push button 1(above the green LED) to key): key feed rate
- *: clear the feed rate
video: